Package com.smartgwt.client.widgets

# Class Canvas

java.lang.Object
com.google.gwt.user.client.ui.UIObject
com.google.gwt.user.client.ui.Widget
com.smartgwt.client.widgets.BaseWidget
com.smartgwt.client.widgets.Canvas

All Implemented Interfaces:
  `HasAttachHandlers`, `HasHandlers`, `EventListener`, `HasVisibility`, `IsWidget`, `LogicalStructure`, `HasClearHandlers`, `HasClickHandlers`, `HasDoubleClickHandlers`, `HasDragMoveHandlers`, `HasDragRepositionMoveHandlers`, `HasDragRepositionStartHandlers`, `HasDragRepositionStopHandlers`, `HasDragResizeMoveHandlers`, `HasDragResizeStartHandlers`, `HasDragResizeStopHandlers`, `HasDragStartHandlers`, `HasDragStopHandlers`, `HasDropHandlers`, `HasDropMoveHandlers`, `HasDropOutHandlers`, `HasDropOverHandlers`, `HasFocusChangedHandlers`, `HasHoverHandlers`, `HasHoverHiddenHandlers`, `HasKeyDownHandlers`, `HasKeyPressHandlers`, `HasMouseDownHandlers`, `HasMouseMoveHandlers`, `HasMouseOutHandlers`, `HasMouseOverHandlers`, `HasMouseStillDownHandlers`, `HasMouseUpHandlers`, `HasMouseWheelHandlers`, `HasMovedHandlers`, `HasParentMovedHandlers`, `HasResizedHandlers`, `HasRightMouseDownHandlers`, `HasRuleContextChangedHandlers`, `HasScrolledHandlers`, `HasShowContextMenuHandlers`, `HasVisibilityChangedHandlers`

Direct Known Subclasses:
  `AceEditor`, `BrowserPlugin`, `Calendar`, `DetailViewer`, `DrawKnob`, `DrawPane`, `DynamicForm`, `EdgedCanvas`, `EditPane`, `GridRenderer`, `HTMLFlow`, `Layout`, `LayoutSpacer`, `PrintCanvas`, `RangeSlider`, `RowRangeDisplay`, `Slider`, `StatefulCanvas`, `TabSet`, `TileLayout`, `WidgetCanvas`

public class Canvas extends BaseWidget implements HasClickHandlers, HasDoubleClickHandlers, HasDragMoveHandlers, HasDragRepositionMoveHandlers, HasDragRepositionStartHandlers, HasDragRepositionStopHandlers, HasDragResizeMoveHandlers, HasDragResizeStartHandlers, HasDragResizeStopHandlers, HasDragStartHandlers, HasDragStopHandlers, HasDropMoveHandlers, HasDropOutHandlers, HasDropOverHandlers, HasFocusChangedHandlers, HasHoverHandlers, HasHoverHiddenHandlers, HasKeyDownHandlers, HasKeyPressHandlers, HasMouseDownHandlers, HasMouseMoveHandlers, HasMouseOutHandlers, HasMouseOverHandlers, HasMouseStillDownHandlers, HasMouseUpHandlers, HasMouseWheelHandlers, HasMovedHandlers, HasClearHandlers, HasDropHandlers, HasParentMovedHandlers, HasResizedHandlers, HasRightMouseDownHandlers, HasRuleContextChangedHandlers, HasScrolledHandlers, HasShowContextMenuHandlers, HasVisibilityChangedHandlers
Base class for all Smart GWT visual components (except `FormItems`).

Canvas provides:

- basic visual lifecycle support - creation and destruction of HTML via `draw()` and `clear()`, visibility via `show()` and `hide()`, z-layering via `bringToFront()` and `sendToBack()`.
- consistent cross-browser `positioning`, `sizing` and `size detection`, with automatic compensation for `browser CSS behavior differences`.
- clipping, scrolling and overflow management of content via `overflow`
- consistent cross-browser `key` and `mouse` events, including `mapping touch events` to mouse events
- built-in drag and drop capabilities including `moving`, `resizing`, `drag scrolling` and `snap-to-grid` behavior.
- the ability to either contain `HTML content` or `contain other Canvases`, including `an edge-based positioning` and `percent sizing system` for children. For more advanced layout capabilities, see `Layout`.
- various other details like `cursors`, `modal masking`, `animation`, `accessibility properties`, and `settings` for `automated testing`.

- ## Nested Class Summary

  ## Nested classes/interfaces inherited from class com.google.gwt.user.client.ui.UIObject

  `UIObject.DebugIdImpl, UIObject.DebugIdImplEnabled`

- ## Field Summary

  ### Fields inherited from class com.smartgwt.client.widgets.BaseWidget

  `config, configOnly, factoryCreated, factoryProperties, id, nativeObject, scClassName`

  ### Fields inherited from class com.google.gwt.user.client.ui.UIObject

  `DEBUG_ID_PREFIX`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `Canvas()`
  `Canvas(JavaScriptObject jsObj)`
  `Canvas(String id)`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `addChild(Widget widget)`
  Adds newChild as a child of this widget, set up a named object reference (i.e., this[name]) to the new widget if name argument is provided, and draw the child if this widget has been drawn already.
  `Canvas`
  `addChild(Canvas newChild)`
  Adds newChild as a child of this widget, set up a named object reference (i.e., this[name]) to the new widget if name argument is provided, and draw the child if this widget has been drawn already.
  `Canvas`
  `addChild(Canvas newChild, String name)`
  See `addChild()`
  `Canvas`
  `addChild(Canvas newChild, String name, boolean autoDraw)`
  Adds newChild as a child of this widget, set up a named object reference (i.e., this[name]) to the new widget if name argument is provided, and draw the child if this widget has been drawn already.
  `Canvas`
  `addChild(Canvas newChild, String name, Boolean autoDraw)`
  Adds newChild as a child of this widget, set up a named object reference (i.e., this[name]) to the new widget if name argument is provided, and draw the child if this widget has been drawn already.
  `HandlerRegistration`
  `addClearHandler(ClearHandler handler)`
  Add a clear handler.
  `HandlerRegistration`
  `addClickHandler(ClickHandler handler)`
  Add a click handler.
  `HandlerRegistration`
  `addDoubleClickHandler(DoubleClickHandler handler)`
  Add a doubleClick handler.
  `HandlerRegistration`
  `addDragMoveHandler(DragMoveHandler handler)`
  Add a dragMove handler.
  `HandlerRegistration`
  `addDragRepositionMoveHandler(DragRepositionMoveHandler handler)`
  Add a dragRepositionMove handler.
  `HandlerRegistration`
  `addDragRepositionStartHandler(DragRepositionStartHandler handler)`
  Add a dragRepositionStart handler.
  `HandlerRegistration`
  `addDragRepositionStopHandler(DragRepositionStopHandler handler)`
  Add a dragRepositionStop handler.
  `HandlerRegistration`
  `addDragResizeMoveHandler(DragResizeMoveHandler handler)`
  Add a dragResizeMove handler.
  `HandlerRegistration`
  `addDragResizeStartHandler(DragResizeStartHandler handler)`
  Add a dragResizeStart handler.
  `HandlerRegistration`
  `addDragResizeStopHandler(DragResizeStopHandler handler)`
  Add a dragResizeStop handler.
  `HandlerRegistration`
  `addDragStartHandler(DragStartHandler handler)`
  Add a dragStart handler.
  `HandlerRegistration`
  `addDragStopHandler(DragStopHandler handler)`
  Add a dragStop handler.
  `HandlerRegistration`
  `addDropHandler(DropHandler handler)`
  Add a drop handler.
  `HandlerRegistration`
  `addDropMoveHandler(DropMoveHandler handler)`
  Add a dropMove handler.
  `HandlerRegistration`
  `addDropOutHandler(DropOutHandler handler)`
  Add a dropOut handler.
  `HandlerRegistration`
  `addDropOverHandler(DropOverHandler handler)`
  Add a dropOver handler.
  `HandlerRegistration`
  `addFocusChangedHandler(FocusChangedHandler handler)`
  Add a focusChanged handler.
  `HandlerRegistration`
  `addHoverHandler(HoverHandler handler)`
  Add a hover handler.
  `HandlerRegistration`
  `addHoverHiddenHandler(HoverHiddenHandler handler)`
  Add a hoverHidden handler.
  `HandlerRegistration`
  `addKeyDownHandler(KeyDownHandler handler)`
  Add a keyDown handler.
  `HandlerRegistration`
  `addKeyPressHandler(KeyPressHandler handler)`
  Add a keyPress handler.
  `HandlerRegistration`
  `addMouseDownHandler(MouseDownHandler handler)`
  Add a mouseDown handler.
  `HandlerRegistration`
  `addMouseMoveHandler(MouseMoveHandler handler)`
  Add a mouseMove handler.
  `HandlerRegistration`
  `addMouseOutHandler(MouseOutHandler handler)`
  Add a mouseOut handler.
  `HandlerRegistration`
  `addMouseOverHandler(MouseOverHandler handler)`
  Add a mouseOver handler.
  `HandlerRegistration`
  `addMouseStillDownHandler(MouseStillDownHandler handler)`
  Add a mouseStillDown handler.
  `HandlerRegistration`
  `addMouseUpHandler(MouseUpHandler handler)`
  Add a mouseUp handler.
  `HandlerRegistration`
  `addMouseWheelHandler(MouseWheelHandler handler)`
  Add a mouseWheel handler.
  `HandlerRegistration`
  `addMovedHandler(MovedHandler handler)`
  Add a moved handler.
  `HandlerRegistration`
  `addParentMovedHandler(ParentMovedHandler handler)`
  Add a parentMoved handler.
  `Canvas`
  `addPeer(Canvas newPeer)`
  Adds newPeer as a peer of this widget (also making it a child of this widget's parent, if any), set up a named object reference (i.e., this[name]) to the new widget if name is provided, and draw the peer if this widget has been drawn already.
  `Canvas`
  `addPeer(Canvas newPeer, String name)`
  See `addPeer()`
  `Canvas`
  `addPeer(Canvas newPeer, String name, Boolean autoDraw)`
  See `addPeer()`
  `Canvas`
  `addPeer(Canvas newPeer, String name, Boolean autoDraw, Boolean preDraw)`
  Adds newPeer as a peer of this widget (also making it a child of this widget's parent, if any), set up a named object reference (i.e., this[name]) to the new widget if name is provided, and draw the peer if this widget has been drawn already.
  `HandlerRegistration`
  `addResizedHandler(ResizedHandler handler)`
  Add a resized handler.
  `HandlerRegistration`
  `addRightMouseDownHandler(RightMouseDownHandler handler)`
  Add a rightMouseDown handler.
  `HandlerRegistration`
  `addRuleContextChangedHandler(RuleContextChangedHandler handler)`
  Add a ruleContextChanged handler.
  `HandlerRegistration`
  `addScrolledHandler(ScrolledHandler handler)`
  Add a scrolled handler.
  `HandlerRegistration`
  `addShowContextMenuHandler(ShowContextMenuHandler handler)`
  Add a showContextMenu handler.
  `void`
  `addSnapAlignCandidate(Canvas newCandidate)`
  Add a candidate to `snapAlignCandidates`.
  `void`
  `addStyleName(String style)`
  Multiple styles are currently not supported.
  `HandlerRegistration`
  `addVisibilityChangedHandler(VisibilityChangedHandler handler)`
  Add a visibilityChanged handler.
  `void`
  `adjustForContent(boolean immediate)`
  This method tells a component to adjust for changes in the size of its content that happen outside of Smart GWT APIs.
  `void`
  `animateFade(int opacity)`
  Animate a change in opacity from the widget's current opacity to the specified opacity.
  `void`
  `animateFade(int opacity, AnimationCallback callback)`
  Animate a change in opacity from the widget's current opacity to the specified opacity.
  `void`
  `animateFade(int opacity, AnimationCallback callback, int duration)`
  Animate a change in opacity from the widget's current opacity to the specified opacity.
  `void`
  `animateFade(int opacity, AnimationCallback callback, int duration, AnimationAcceleration acceleration)`
  Animate a change in opacity from the widget's current opacity to the specified opacity.
  `void`
  `animateFade(Integer opacity)`
  Animate a change in opacity from the widget's current opacity to the specified opacity.
  `void`
  `animateFade(Integer opacity, AnimationCallback callback)`
  See `animateFade()`
  `void`
  `animateFade(Integer opacity, AnimationCallback callback, Integer duration)`
  See `animateFade()`
  `void`
  `animateFade(Integer opacity, AnimationCallback callback, Integer duration, AnimationAcceleration acceleration)`
  Animate a change in opacity from the widget's current opacity to the specified opacity.
  `void`
  `animateHide()`
  See `animateHide(AnimationEffect, AnimationCallback, int)`
  `void`
  `animateHide(AnimationEffect effect)`
  See `animateHide(AnimationEffect, AnimationCallback, int)`
  `void`
  `animateHide(AnimationEffect effect, AnimationCallback callback)`
  See `animateHide(AnimationEffect, AnimationCallback, int)`
  `void`
  `animateHide(AnimationEffect effect, AnimationCallback callback, int duration)`
  Hide a canvas by shrinking it vertically to zero height over a period of time.
  `void`
  `animateHide(AnimateShowEffect effect)`
  See `animateHide(AnimateShowEffect, AnimationCallback, int)`
  `void`
  `animateHide(AnimateShowEffect effect, AnimationCallback callback)`
  See `animateHide(AnimateShowEffect, AnimationCallback, int)`
  `void`
  `animateHide(AnimateShowEffect effect, AnimationCallback callback, int duration)`
  Hide a canvas by shrinking it vertically to zero height over a period of time.
  `void`
  `animateMove(Integer left, Integer top)`
  Animate a reposition of this canvas from its current position to the specified position
  `void`
  `animateMove(Integer left, Integer top, AnimationCallback callback)`
  See `animateMove()`
  `void`
  `animateMove(Integer left, Integer top, AnimationCallback callback, Integer duration)`
  See `animateMove()`
  `void`
  `animateMove(Integer left, Integer top, AnimationCallback callback, Integer duration, AnimationAcceleration acceleration)`
  Animate a reposition of this canvas from its current position to the specified position
  `void`
  `animateRect(Integer left, Integer top, Integer width, Integer height)`
  Animate a reposition / resize of this canvas from its current size and position.
  `void`
  `animateRect(Integer left, Integer top, Integer width, Integer height, AnimationCallback callback)`
  See `animateRect()`
  `void`
  `animateRect(Integer left, Integer top, Integer width, Integer height, AnimationCallback callback, Integer duration)`
  See `animateRect()`
  `void`
  `animateRect(Integer left, Integer top, Integer width, Integer height, AnimationCallback callback, Integer duration, AnimationAcceleration acceleration)`
  Animate a reposition / resize of this canvas from its current size and position.
  `void`
  `animateResize(Integer width, Integer height)`
  Animate a resize of this canvas from its current size to the specified size
  `void`
  `animateResize(Integer width, Integer height, AnimationCallback callback)`
  See `animateResize()`
  `void`
  `animateResize(Integer width, Integer height, AnimationCallback callback, Integer duration)`
  See `animateResize()`
  `void`
  `animateResize(Integer width, Integer height, AnimationCallback callback, Integer duration, AnimationAcceleration acceleration)`
  Animate a resize of this canvas from its current size to the specified size
  `void`
  `animateScroll(int scrollLeft, int scrollTop, AnimationCallback callback)`
  Animate a scroll from the current scroll position to the specified position.
  `void`
  `animateScroll(int scrollLeft, int scrollTop, AnimationCallback callback, int duration)`
  Animate a scroll from the current scroll position to the specified position.
  `void`
  `animateScroll(Integer scrollLeft, Integer scrollTop)`
  Animate a scroll from the current scroll position to the specified position.
  `void`
  `animateScroll(Integer scrollLeft, Integer scrollTop, AnimationCallback callback)`
  See `animateScroll()`
  `void`
  `animateScroll(Integer scrollLeft, Integer scrollTop, AnimationCallback callback, Integer duration)`
  See `animateScroll()`
  `void`
  `animateScroll(Integer scrollLeft, Integer scrollTop, AnimationCallback callback, Integer duration, AnimationAcceleration acceleration)`
  Animate a scroll from the current scroll position to the specified position.
  `void`
  `animateShow()`
  See `animateShow(AnimationEffect, AnimationCallback, int)`
  `void`
  `animateShow(AnimationEffect effect)`
  See `animateShow(AnimationEffect, AnimationCallback, int)`
  `void`
  `animateShow(AnimationEffect effect, AnimationCallback callback)`
  See `animateShow(AnimationEffect, AnimationCallback, int)`
  `void`
  `animateShow(AnimationEffect effect, AnimationCallback callback, int duration)`
  Show a canvas by growing it vertically to its fully drawn height over a period of time.
  `void`
  `animateShow(AnimateShowEffect effect)`
  See `animateShow(AnimateShowEffect, AnimationCallback, int)`
  `void`
  `animateShow(AnimateShowEffect effect, AnimationCallback callback)`
  See `animateShow(AnimateShowEffect, AnimationCallback, int)`
  `void`
  `animateShow(AnimateShowEffect effect, AnimationCallback callback, int duration)`
  Show a canvas by growing it vertically to its fully drawn height over a period of time.
  `static <T extends Canvas>
  T`
  `asSGWTComponent(JavaScriptObject jsObj)`
  Returns the existing SGWT widget, or creates and returns one if none exist, associated with the supplied `JavaScriptObject`.
  `void`
  `blur()`
  If this canvas has keyboard focus, blur it.
  `void`
  `bringToFront()`
  Puts this widget at the top of the stacking order, so it appears in front of all other widgets in the same parent.
  `static void`
  `changeAutoChildDefaults(String autoChildName, Canvas defaults)`
  Changes the defaults for Canvas AutoChildren named `autoChildName`.
  `static void`
  `changeAutoChildDefaults(String autoChildName, FormItem defaults)`
  Changes the defaults for FormItem AutoChildren named `autoChildName`.
  `void`
  `clear()`
  Remove all visual representation of a Canvas, including all child or member Canvases, or managed top-level components such as the ListGrid drop location indicator.
  `void`
  `clearExplicitTabIndex()`
  If an explicit `tabIndex` was assigned to this widget, clear it.
  `Boolean`
  `clickMaskUp()`
  Determines whether a clickmask is showing
  `Boolean`
  `clickMaskUp(String ID)`
  Determines whether a clickmask is showing
  `Boolean`
  `contains(Canvas canvas)`
  Returns true if element is a descendant of this widget (i.e., exists below this widget in the containment hierarchy); and false otherwise.
  `Boolean`
  `contains(Canvas canvas, Boolean testSelf)`
  Returns true if element is a descendant of this widget (i.e., exists below this widget in the containment hierarchy); and false otherwise.
  `Boolean`
  `containsEvent()`
  Return true if the last event's mouse coordinates are within the bounds of this component.
  `Boolean`
  `containsEventTarget()`
  Returns true if the current `mouse event target` is this component or a descendent of this component.
  `Boolean`
  `containsFocus()`
  Returns true if the keyboard focus is in this Canvas or any child of this Canvas.
  `Boolean`
  `containsPoint(int x, int y)`
  Return whether or not this object contains the specified global (x,y) coordinates.
  `Boolean`
  `containsPoint(int x, int y, Boolean withinViewport)`
  Return whether or not this object contains the specified global (x,y) coordinates.
  `protected JavaScriptObject`
  `create()`
  `void`
  `dataContextChanged()`
  Notification method fired when `DataContext` is bound.
  `void`
  `deparent()`
  Remove this canvas from its parent if it has one.
  `void`
  `depeer()`
  Make this Canvas no longer a peer of its master
  `void`
  `disable()`
  Disables this widget and any children and peers of this widget.
  `void`
  `doValueDictation(String text)`
  If `supportsVoiceCommands()` returns true, this method may be implemented to deal with transcriptions recorded while this Canvas has focus.
  `void`
  `doVoiceCommand(String text)`
  If `supportsVoiceCommands()` returns true, this method must be implemented to deal with Voice commands recorded while this Canvas has focus.
  `void`
  `enable()`
  Enables this widget and any children / peers of this widget.
  `Boolean`
  `encloses(Canvas other)`
  Returns true if the rectangle of this widget encloses the rectangle of the specified widget.
  `void`
  `focus()`
  If this canvas can accept focus, give it keyboard focus.
  `void`
  `focusAfterGroup()`
  Shifts focus to the next focusable element after this one, skipping any elements nested inside the tabbing group for this canvas, such as focusable children.
  `void`
  `focusAtEnd(boolean start)`
  Shifts focus to the start or end of this canvas and its descendants.
  `void`
  `focusInNextTabElement()`
  Shifts focus to the next focusable element after this one.
  `void`
  `focusInPreviousTabElement()`
  Shifts focus to the previous focusable element before this one.
  `int`
  `getAbsoluteLeft()`
  This method is similar to `getPageLeft()`.
  `int`
  `getAbsoluteTop()`
  This method is similar to `getPageTop()`.
  `String`
  `getAccessKey()`
  If specified this governs the HTML accessKey for the widget.
  `Integer`
  `getAdaptiveHeightPriority()`
  See `adaptiveWidthPriority`.
  `Integer`
  `getAdaptiveWidthPriority()`
  If multiple widgets in the same Layout have `adaptive width`, `adaptiveWidthPriority` can be set to indicate which of the components should be given priority access to space.
  `static Canvas[]`
  `getAllCanvases()`
  Returns an array of Canvas instances based on the specified filter mode and optional `AdvancedCriteria`.
  `static Canvas[]`
  `getAllCanvases(CanvasFilterMode mode)`
  See `getAllCanvases()`
  `static Canvas[]`
  `getAllCanvases(CanvasFilterMode mode, AdvancedCriteria criteria)`
  Returns an array of Canvas instances based on the specified filter mode and optional `AdvancedCriteria`.
  `Boolean`
  `getAlwaysManageFocusNavigation()`
  Should focus navigation for this canvas and its descendents be handled explicitly by intercepting "Tab" key events and calling the `TabIndexManager.shiftFocus()` API?
  `Boolean`
  `getAlwaysShowScrollbars()`
  Should this browser always show custom scrollbars if `showCustomScrollbars` is true?
  `AnimationAcceleration`
  `getAnimateAcceleration()`
  Default acceleration effect to apply to all animations on this Canvas.
  `Integer`
  `getAnimateFadeTime()`
  Default time for performing an animated fade.
  `AnimationAcceleration`
  `getAnimateHideAcceleration()`
  Default acceleration function for performing an animated hide.
  `AnimationEffect`
  `getAnimateHideEffect()`
  Default animation effect to use if `animateHide()` is called without an explicit effect parameter.
  `Integer`
  `getAnimateHideTime()`
  Default time for performing an animated hide.
  `AnimationAcceleration`
  `getAnimateMoveAcceleration()`
  Default acceleration effect for performing an animated move.
  `Integer`
  `getAnimateMoveTime()`
  Default time for performing an animated move.
  `AnimationAcceleration`
  `getAnimateRectAcceleration()`
  Default acceleration function for performing an animated move and resize.
  `Integer`
  `getAnimateRectTime()`
  Default time for performing an animated setRect.
  `AnimationAcceleration`
  `getAnimateResizeAcceleration()`
  Default acceleration function for performing an animated resize.
  `AnimationLayoutMode`
  `getAnimateResizeLayoutMode()`
  When to update the `child layout` for a `size animation`.
  `Integer`
  `getAnimateResizeTime()`
  Default time for performing an animated resize.
  `AnimationAcceleration`
  `getAnimateScrollAcceleration()`
  Default acceleration function for performing an animated scroll.
  `Integer`
  `getAnimateScrollTime()`
  Default time for performing an animated scroll.
  `AnimationAcceleration`
  `getAnimateShowAcceleration()`
  Default acceleration function for performing an animated show.
  `AnimationEffect`
  `getAnimateShowEffect()`
  Default animation effect to use if `animateShow()` is called without an explicit effect parameter.
  `Integer`
  `getAnimateShowTime()`
  Default time for performing an animated show.
  `int`
  `getAnimateTime()`
  Default total duration of animations.
  `String`
  `getAppImgDir()`
  Default directory for app-specific images, relative to the Page-wide `appImgDir`.
  `String`
  `getAriaHandleID()`
  Returns the DOM ID for the main element for this canvas which will have ARIA `role` and `attributes` applied to it.
  `String`
  `getAriaRole()`
  ARIA role of this component.
  `Map`
  `getAriaStateDefaults()`
  Retrieves dynamically calculated default ARIA state properties for this canvas.
  `Boolean`
  `getAutoMaskComponents()`
  Deprecated.
  As of Smart GWT version 10.0, deprecated in favor of `EditProxy.autoMaskChildren`
  `String`
  `getAutoParent()`
  This initialization property allows developers to create a canvas using the Class.addAutoChild() method, and have it added as a child to some other component.
  `Boolean`
  `getAutoPopulateData()`
  If a `dataContext` is provided, should subcomponents automatically bind to the data?
  `Boolean`
  `getAutoShowParent()`
  If set to true, the widget's parent (if any) will automatically be shown whenever the widget is shown.
  `String`
  `getBackgroundColor()`
  The background color for this widget.
  `String`
  `getBackgroundImage()`
  URL for a background image for this widget (corresponding to the CSS "background-image" attribute).
  `String`
  `getBackgroundPosition()`
  Specifies how the background image should be positioned on the widget.
  `BackgroundRepeat`
  `getBackgroundRepeat()`
  Specifies how the background image should be tiled if this widget is larger than the image.
  `String`
  `getBorder()`
  Set the CSS border of this component, as a CSS string including border-width, border-style, and/or color (eg "2px solid blue").
  `String`
  `getBorderRadius()`
  The CSS border-radius for this widget.
  `int`
  `getBottom()`
  Return the bottom coordinate of this object as rendered, relative to its enclosing context, in pixels.
  `static Canvas`
  `getById(String ID)`
  Retrieve a Canvas by its global `ID`.
  `static Canvas`
  `getByJSObject(JavaScriptObject jsObj)`
  Retrieve a Canvas from its `JavaScriptObject`.
  `Canvas`
  `getByLocalId(String ID)`
  Retrieve a child of this Canvas by it's local ID.
  `Boolean`
  `getCanAcceptDrop()`
  Indicates that this object can receive dropped widgets (i.e.
  `Boolean`
  `getCanAdaptHeight()`
  See `canAdaptWidth`.
  `Boolean`
  `getCanAdaptWidth()`
  Indicates that this component is able to render itself at multiple possible sizes, in order to fit into less space when very little space is available, or to display more information or provide more immediate access to functionality when more space is available.
  `Boolean`
  `getCanDrag()`
  Indicates whether this widget can initiate custom drag-and-drop operations (other than reposition or resize).
  `Boolean`
  `getCanDragReposition()`
  Indicates whether this widget can be moved by a user of your application by simply dragging with the mouse.
  `Boolean`
  `getCanDragResize()`
  Indicates whether this widget can be resized by dragging on the edges and/or corners of the widget with the mouse.
  `boolean`
  `getCanDragScroll()`
  If this Canvas is canAcceptDrop:true, when the user drags a droppable widget over an edge of the widget, should we scroll to show the rest of the widget's content? Returned from canvas.shouldDragScroll() if there are scrollbars.
  `Boolean`
  `getCanDrop()`
  Indicates that this object can be dropped on top of other widgets.
  `Boolean`
  `getCanDropBefore()`
  When explicitly set to false, disallows drop before this member in the Layout.
  `Boolean`
  `getCanFocus()`
  Can this widget be allowed to become the target of keyboard events?
  `Boolean`
  `getCanHover()`
  Will this Canvas fire hover events when the user hovers over it, or one of its children?
  `Boolean`
  `getCanSelectText()`
  Whether native drag selection of contained text is allowed within this Canvas.
  `final Canvas`
  `getCanvasAutoChild(String autoChildName)`
  Returns the `Canvas` AutoChild named `autoChildName` if already created.
  `CanvasItem`
  `getCanvasItem()`
  If this canvas is being displayed in a `CanvasItem`, this property will be set to point at the item.
  `Canvas[]`
  `getChildren()`
  Array of all Canvii that are immediate children of this Canvas.
  `String[]`
  `getChildrenAsStringArray()`
  Array of all Canvii that are immediate children of this Canvas.
  `Boolean`
  `getChildrenResizeSnapAlign()`
  Flag to disable snapping to alignment when children of this Canvas are resized
  `Boolean`
  `getChildrenSnapAlign()`
  If enabled while `childrenSnapToGrid` is enabled, children dragged within this Canvas will also snap to positions where their edges or center lines would be aligned with the edges or centers of other components, and lines will be shown to point out the possible alignment (with appearance controlled by `snapAlignCenterLineStyle` and `snapAlignEdgeLineStyle` respectively.
  `Boolean`
  `getChildrenSnapCenterAlign()`
  See `childrenSnapAlign`.
  `Boolean`
  `getChildrenSnapEdgeAlign()`
  See `childrenSnapAlign`.
  `Boolean`
  `getChildrenSnapResizeToGrid()`
  If true, causes this canvas's children to snap to its grid when resizing.
  `Boolean`
  `getChildrenSnapToGrid()`
  If true, causes this canvas's children to snap to its grid when dragging.
  `Integer`
  `getChildTabPosition(Canvas child)`
  For a given child widget where `updateTabPositionOnReparent` is true, return the expected tab position within this parent.
  `String`
  `getClassName()`
  Returns the JavaScript class name.
  `Canvas`
  `getComponentMask()`
  Automatically generated mask canvas displayed when `showComponentMask()` is called.
  `Canvas`
  `getComponentMaskDefaults()`
  Defaults for the `componentMask` autoChild.
  `Element`
  `getContentElement()`
  Returns the DOM element for this Canvas which contains the `contents`, or for `parent components`, the DOM elements for any drawn children.
  `String`
  `getContents()`
  The contents of a canvas or label widget.
  `Menu`
  `getContextMenu()`
  Context menu to show for this object, an instance of the Menu widget.
  `Boolean`
  `getCorrectZoomOverflow()`
  Whether the Framework should correct for erroneous scrollHeight and scrollWidth values reported by the browser when zoomed (via browser or OS-level zoom) by allowing `maxZoomOverflowError` of overflow before enabling scrolling and displaying custom scrollbars.
  `Cursor`
  `getCursor()`
  Specifies the css cursor image to display when the mouse pointer is over this component.
  `DataContext`
  `getDataContext()`
  A mapping from `DataSource` IDs to specific `Records` from those DataSources, that `DataBoundComponents` contained within this Canvas should automatically bind to if a DataSource is provided but data is not provided (directly or indirectly, for example, indirectly via setting `ListGrid.autoFetchData`.
  `String`
  `getDataPath()`
  A dataPath may be specified on any canvas.
  `int`
  `getDefaultHeight()`
  For custom components, establishes a default height for the component.
  `int`
  `getDefaultWidth()`
  For custom components, establishes a default width for the component.
  `String`
  `getDefiningProperty()`
  This attribute denotes the name of a property to use as a `getDefiningPropertyName()` for this property when generating and resolving `AutoTest locators with search segments`.
  `String`
  `getDefiningPropertyName()`
  This method returns the name of an attribute for the `AutoTest` system to use as the `definingProperty` when generating `locators`.
  `String[]`
  `getDefiningPropertyNameOptions()`
  If no explicit `definingProperty` was specified for this component, this array denotes a list of options to use as a `defining property` when generating and resolving `AutoTest locators with search segments`.
  `Boolean`
  `getDestroyed()`
  If this property is set to `true`, the `destroy()` method has been called on this canvas.
  `Boolean`
  `getDestroying()`
  This property is set to true when the `destroy()` method is called on a widget.
  `boolean`
  `getDisabled()`
  If set to true, the widget will be disabled.
  `Cursor`
  `getDisabledCursor()`
  Specifies the cursor image to display when the mouse pointer is over this widget if this widget is disabled.
  `Boolean`
  `getDisableTouchScrollingForDrag()`
  Disables `useTouchScrolling` whenever a built-in drag operation has been enabled which is known to be non-functional if touch scrolling is enabled.
  `int`
  `getDoubleClickDelay()`
  Amount of time (in milliseconds) between which two clicks are considered a single click
  `DragAppearance`
  `getDragAppearance()`
  Visual appearance to show when the object is being dragged.
  `DragIntersectStyle`
  `getDragIntersectStyle()`
  This indicates how the system will test for droppable targets: either by intersection with the mouse or intersection with the rectangle of the dragMoveTarget.
  `DragMaskType`
  `getDragMaskType()`
  This property controls what kind of mask is used in case `useDragMask` is enabled.
  `int`
  `getDragMaxHeight()`
  Sets maximum height that this Canvas can be resized to by a user.
  `int`
  `getDragMaxWidth()`
  Maximum width that this Canvas can be resized to by a user.
  `int`
  `getDragMinHeight()`
  Minimum height that this Canvas can be resized to by a user.
  `int`
  `getDragMinWidth()`
  Minimum width that this Canvas can be resized to by a user.
  `Integer`
  `getDragOpacity()`
  If this widget has dragAppearance `"target"`, this value specifies the opacity to render the target while it is being dragged.
  `DragAppearance`
  `getDragRepositionAppearance()`
  If `canDragReposition` is true, this attribute specifies the visual appearance to show during drag reposition.
  `Cursor`
  `getDragRepositionCursor()`
  Cursor to switch to if the mouse is over a widget that is drag repositionable.
  `DragAppearance`
  `getDragResizeAppearance()`
  If `canDragResize` is true, this attribute specifies the visual appearance to show during drag resize.
  `int`
  `getDragScrollDelay()`
  If this widget supports drag-scrolling, This property specifies how many ms the user must hover over the drag-scroll threshold before scrolling begins.
  `int`
  `getDragStartDistance()`
  Number of pixels the cursor needs to move before the EventHandler starts a drag operation.
  `Canvas`
  `getDragTarget()`
  A different widget that should be actually dragged when dragging initiates on this widget.
  `String`
  `getDragTargetAsString()`
  A different widget that should be actually dragged when dragging initiates on this widget.
  `String`
  `getDragType()`
  Sets a `dragType` for this widget used, to be compared to `dropTypes` on possible drop target widgets.
  `Canvas`
  `getDropTarget()`
  Delegates a different widget that should actually be dropped on if the cursor is over this widget when the drop completes.
  `String`
  `getDropTargetAsString()`
  Delegates a different widget that should actually be dropped on if the cursor is over this widget when the drop completes.
  `String[]`
  `getDropTypes()`
  When a drag and drop interaction occurs, if a `dragType` is configured on the source widget, it is compared to the `dropTypes` configured on the target widget, and a drop is only allowed if the `dragType` is listed in the target widget's `dropTypes` array.
  `String`
  `getDropTypesAsString()`
  When a drag and drop interaction occurs, if a `dragType` is configured on the source widget, it is compared to the `dropTypes` configured on the target widget, and a drop is only allowed if the `dragType` is listed in the target widget's `dropTypes` array.
  `Boolean`
  `getDynamicContents()`
  Dynamic contents allows the contents string to be treated as a simple but powerful template.
  `String`
  `getEdgeBackgroundColor()`
  Background color for the EdgedCanvas created to decorate this component.
  `String`
  `getEdgeCenterBackgroundColor()`
  Background color for the center section only.
  `String`
  `getEdgeImage()`
  Base name of images for edges.
  `int`
  `getEdgeMarginSize()`
  How far into the edge of an object do we consider the "edge" for drag resize purposes?
  `Integer`
  `getEdgeOffset()`
  Amount the contained Canvas should be offset.
  `Integer`
  `getEdgeOpacity()`
  Opacity of the edges.
  `Boolean`
  `getEdgeShowCenter()`
  Whether to show media in the center section, that is, behind the decorated Canvas.
  `int`
  `getEdgeSize()`
  Size in pixels for corners and edges
  `EditNode`
  `getEditNode()`
  The component's `EditNode` for a component that has been created by a `Palette` from a `PaletteNode`.
  `EditProxy`
  `getEditProxy()`
  An `EditProxy` controls the behaviors of a component when it is placed into `editing mode`.
  `String`
  `getEditProxyConstructor()`
  Default class used to construct the `EditProxy` for this component when the component is `first placed into edit mode`.
  `Element`
  `getElement()`
  Normal usage of SmartGWT is to call draw() on SmartGWT widgets, not to use use RootPanel.add().
  `Element`
  `getElement(boolean allowPreRender)`
  `AdvancedCriteria`
  `getEnableWhen()`
  Criteria to be evaluated to determine whether this Canvas should be enabled.
  `Boolean`
  `getEndLine()`
  Whether this canvas should end the line it's in when used as a tile in a `FlowLayout`.
  `static EdgeName`
  `getEventEdge()`
  Check if an event is within an "edge" of this canvas.
  `static EdgeName`
  `getEventEdge(EdgeName... edgeMask)`
  Check if an event is within an "edge" of this canvas.
  `int`
  `getExtraSpace()`
  When this Canvas is included as a member in a Layout, extra blank space that should be left after this member in a Layout.
  `String`
  `getFacetId()`
  If a Canvas is dropped onto a `CubeGrid`, and it has a `facetId` property specified then the Cube treats this as adding that facetId at the drop location.
  `boolean`
  `getFloatingScrollbars()`
  If `showCustomScrollbars` is true, should the scrollbars be drawn floating over the component handle, or should the handle shrink to accommodate them?
  `final FormItem`
  `getFormItemAutoChild(String autoChildName)`
  Returns the `FormItem` AutoChild named `autoChildName` if already created.
  `Boolean`
  `getForwardSVGeventsToObject()`
  If true, events sent to the SVG inside an object tag are forwarded to the object itself by Framework handlers.
  `String`
  `getFullDataPath()`
  Returns a fully qualified `DataPath` for this canvas.
  `String`
  `getGroupBorderCSS()`
  Sets the style for the grouping frame around the canvas.
  `String`
  `getGroupLabelBackgroundColor()`
  If set, the background color of the grouping label.
  `String`
  `getGroupLabelStyleName()`
  Sets the style for the grouping label.
  `Integer`
  `getGroupPadding()`
  Padding to apply inside the border when this canvas is showing a group `border and label`.
  `String`
  `getGroupTitle()`
  The title/label for the grouping.
  `Integer`
  `getHeight()`
  The `canvas.width` attribute specifies the size for a component's horizontal dimension; `canvas.height` specifies the size for the vertical dimension.
  `String`
  `getHeightAsString()`
  `boolean`
  `getHideUsingDisplayNone()`
  When this widget is hidden (see `visibility` and `hide()`), should display:none be applied to the `outer element`?
  `Alignment`
  `getHoverAlign()`
  If `this.showHover` is true, this property can be used to customize the alignment of content in the hover canvas.
  `Boolean`
  `getHoverAutoDestroy()`
  If `this.showHover` is true and `getHoverComponent()` is implemented, should the hoverCanvas returned from it be automatically destroyed when it is hidden?
  `int`
  `getHoverAutoFitMaxWidth()`
  Maximum auto-fit width for a hover if `hoverAutoFitWidth` is enabled.
  `String`
  `getHoverAutoFitMaxWidthAsString()`
  Maximum auto-fit width for a hover if `hoverAutoFitWidth` is enabled.
  `Boolean`
  `getHoverAutoFitWidth()`
  if `showHover` is true, this property will cause the specified `hoverWidth` to be treated as a minimum width for the hover.
  `Canvas`
  `getHoverComponent()`
  When `showHoverComponents` is true, this method is called to get the component to show as a hover for this Canvas.
  `int`
  `getHoverDelay()`
  If `this.canHover` is true, how long should the mouse be kept over this widget before the hover event is fired
  `String`
  `getHoverFocusKey()`
  For canvases `showing a hover`, this attribute gives users a way to pin the hover in place so they can interact with it (scroll it, click embedded links, etc).
  `Integer`
  `getHoverHeight()`
  If `this.showHover` is true, this property can be used to customize the height of the hover canvas shown.
  `String`
  `getHoverHTML()`
  If `this.showHover` is true, when the user holds the mouse over this Canvas for long enough to trigger a hover event, a hover canvas is shown by default.
  `Boolean`
  `getHoverMoveWithMouse()`
  If `this.showHover` is true, should this widget's hover canvas be moved with the mouse while visible?
  `Integer`
  `getHoverOpacity()`
  If `this.showHover` is true, should the hover canvas be shown with opacity other than 100?
  `HoverPersistMode`
  `getHoverPersist()`
  Allows interaction with hovers when the cursor is positioned over them.
  `String`
  `getHoverScreen()`
  Screen to create (via `createScreen()`) in lieu of calling `getHoverComponent()`.
  `String`
  `getHoverStyle()`
  If `this.showHover` is true, this property can be used to specify the css style to apply to the hover canvas.
  `VerticalAlignment`
  `getHoverVAlign()`
  If `this.showHover` is true, this property can be used to customize the vertical alignment of content in the hover canvas.
  `int`
  `getHoverWidth()`
  If `this.showHover` is true, this property can be used to customize the width of the hover canvas shown.
  `Boolean`
  `getHoverWrap()`
  If `this.showHover` is true, this property can be used to customize the whether content in the hover canvas is displayed in a single line, or wraps.
  `int`
  `getHSnapPosition(int coordinate)`
  Override this method to provide a custom snap-to grid.
  `int`
  `getHSnapPosition(int coordinate, String direction)`
  Override this method to provide a custom snap-to grid.
  `Element`
  `getHtmlElement()`
  If specified as a pointer to an HTML element present in the DOM, this canvas will be rendered inside that element on `draw()`.
  `String`
  `getHtmlElementAsString()`
  If specified as a pointer to an HTML element present in the DOM, this canvas will be rendered inside that element on `draw()`.
  `DrawPosition`
  `getHtmlPosition()`
  If `htmlElement` is specified, this attribute specifies the position where the canvas should be inserted relative to the `htmlElement` in the DOM.
  `Element`
  `getImage(String identifier)`
  Retrieve a native image, SVG object element or the container for an SVG symbol or font-icon, by name.
  `static String`
  `getImgURL(String URL)`
  Return the full URL for an image to be drawn in this canvas.
  `static String`
  `getImgURL(String URL, String imgDir)`
  Return the full URL for an image to be drawn in this canvas.
  `int`
  `getInnerContentHeight()`
  Returns the amount of space available for interior content (or relatively positioned child widget(s)) without introducing clipping, scrolling or overflow.
  This is the space within the viewport of the widget (not including padding, and excluding margins, borders or scrollbars) rendered at its specified size.
  `int`
  `getInnerContentWidth()`
  Returns the amount of space available for interior content (or relatively positioned child widget(s)) without introducing clipping, scrolling or overflow.
  This is the space within the viewport of the widget (not including padding, and excluding margins, borders or scrollbars) rendered at its specified size.
  `int`
  `getInnerHeight()`
  Returns the amount of space available for (an) absolutely positioned child widget(s) or absolutely positioned HTML content, without introducing clipping, scrolling or overflow.
  `int`
  `getInnerWidth()`
  Returns the amount of space available for absolutely positioned child widget(s) or absolutely positioned HTML content, without introducing clipping, scrolling or overflow.
  `boolean`
  `getIsGroup()`
  Should a grouping frame be shown around this canvas if a non-empty string has been specified for `groupTitle`.
  `Boolean`
  `getIsPrinting()`
  This boolean flag will be set to true by framework logic while generating print HTML for this widget as a result to a call to `showPrintPreview()` (or just `getPrintHTML()`).
  `Boolean`
  `getIsRuleScope()`
  Marks this Canvas as the `ruleScope` that will be discovered by any contained `DataBoundComponent`s which do not specify an explicit `ruleScope`.
  `Boolean`
  `getIsSnapAlignCandidate()`
  Flag to disable snapping to alignment against this Canvas when other Canvases dragged into the same parent when `childrenSnapAlign` is enabled on this Canvas' parent.
  `Boolean`
  `getKeepInParentRect()`
  Constrains drag-resizing and drag-repositioning of this canvas to either the rect of its parent (if set to true) or an arbitrary rect based on its parent (if set to a [Left,Top,Width,Height] rect array).
  `Alignment`
  `getLayoutAlign()`
  When this Canvas is included as a member in a Layout, layoutAlign controls alignment on the breadth axis of the layout.
  `Boolean`
  `getLeaveGroupLabelSpace()`
  When showing this widget in a `group`, should any content be shifted down so that the group-label doesn't sit in front of it?
  `Integer`
  `getLeavePageSpace()`
  If set, overrides the global `defaultPageSpace`.
  `int`
  `getLeft()`
  Number of pixels the left side of the widget is offset to the right from its default drawing context (either its parent's topleft corner, or the document flow, depending on the value of the `position` property).
  `String`
  `getLeftAsString()`
  Number of pixels the left side of the widget is offset to the right from its default drawing context (either its parent's topleft corner, or the document flow, depending on the value of the `position` property).
  `String`
  `getLocalId()`
  Retrieve the local ID of this canvas.
  `boolean`
  `getLocateByIDOnly()`
  If `true`, when retrieving a `locator` for this component always return a reference directly to this component by `widget ID`, using the compact format `"///canvasID"`, ignoring any parent elements and ignoring any configured `testRoot`.
  `LocatorStrategy`
  `getLocateChildrenBy()`
  Strategy to use when locating children in this canvas from an autoTest locator string.
  `LocatorTypeStrategy`
  `getLocateChildrenType()`
  `LocatorTypeStrategy` to use when finding children within this canvas.
  `LocatorStrategy`
  `getLocatePeersBy()`
  Strategy to use when locating peers of this canvas from an autoTest locator string.
  `LocatorTypeStrategy`
  `getLocatePeersType()`
  `LocatorTypeStrategy` to use when finding peers of this canvas.
  `String`
  `getLocatorName()`
  Local name for referencing this canvas from an autoTest locator string.
  `LogicalStructureObject`
  `getLogicalStructure()`
  Getter implementing the `LogicalStructure` interface, which supports Eclipse's logical structure debugging facility.
  `Integer`
  `getMargin()`
  Set the CSS Margin, in pixels, for this component.
  `Canvas`
  `getMasterCanvas()`
  Returns this canvas's "master" (the canvas to which it was added as a peer), if any.
  `Canvas`
  `getMasterElement()`
  Deprecated.
  In favor or `getMasterCanvas()` as of Smart GWT release 9.1
  `Boolean`
  `getMatchElement()`
  If `htmlElement` is specified, should this canvas be drawn at the same dimensions as the htmlElement?
  See also `matchElementWidth` and `matchElementHeight`
  `MatchElementSizeMode`
  `getMatchElementHeight()`
  For canvases with a specified `htmlElement` where `persistentMatchElement` is set to true, how should the canvas match the element's height?
  `MatchElementSizeMode`
  `getMatchElementWidth()`
  For canvases with a specified `htmlElement` where `persistentMatchElement` is set to true, how should the canvas match the element's width?
  `int`
  `getMaxHeight()`
  Maximum height available to this Canvas.
  `int`
  `getMaxWidth()`
  Maximum width available to this Canvas.
  `int`
  `getMaxZoomOverflowError()`
  When `correctZoomOverflow` is true and browser or OS-level zoom is active, determines how much overflow must occur before the Framework enables scrolling for this canvas.
  `String`
  `getMenuConstructor()`
  Default class used to construct menus created by this component, including context menus.
  `int`
  `getMinHeight()`
  Minimum height available to this Canvas.
  `int`
  `getMinNonEdgeSize()`
  If the widget has drag resize configured on one or more of it's edges, and the edgeMarginSize is large enough that the remaining space is less than `minNonEdgeSize`, the edgeMarginSize will be reduced such that the non-edge part of the widget is at least 1/3 of the total space (with two draggable edges) or half of it (with one draggable edge).
  `int`
  `getMinWidth()`
  Minimum width available to this Canvas.
  `double`
  `getMomentumScrollMinSpeed()`
  The minimum speed in pixels per second that must be reached for momentum scrolling to kick in.
  `int`
  `getMouseStillDownDelay()`
  Amount of time (in milliseconds) between repeated 'mouseStillDown' events for this canvas.
  `int`
  `getMouseStillDownInitialDelay()`
  Amount of time (in milliseconds) before mouseStillDown events start to be fired repeatedly for this canvas.
  `String`
  `getName()`
  Optional name for the canvas, which can later be used to reference it.
  `Boolean`
  `getNativeAutoHideScrollbars()`
  In some platform/browser configurations, scrollable regions do not show visible scrollbars until the user attempts to interact with the region.
  `int`
  `getNextZIndex()`
  get the next zIndex for the next item to be drawn.
  `Boolean`
  `getNoDoubleClicks()`
  If true, this canvas will receive all mouse-clicks as single `click` events rather than as `doubleClick` events.
  `Cursor`
  `getNoDropCursor()`
  Specifies the cursor image to display when the user drags a droppable canvas over this if it is not a valid drop target for the event and `showNoDropIndicator` is true.
  `int`
  `getOffsetHeight()`
  `int`
  `getOffsetWidth()`
  `int`
  `getOffsetX()`
  Return the X-coordinate of the last event relative to the left edge of the content of this Canvas.
  NOTE: To get a coordinate relative to the viewport of this Canvas, subtract this.getScrollLeft()
  `int`
  `getOffsetY()`
  Return the Y-coordinate of the last event, relative to the top edge of the content of this Canvas.
  NOTE: To get a coordinate relative to the viewport of this Canvas, subtract this.getScrollTop()
  `Integer`
  `getOpacity()`
  Renders the widget to be partly transparent.
  `static Canvas`
  `getOrCreateRef(JavaScriptObject jsObj)`
  `Element`
  `getOuterElement()`
  Returns the outer DOM element of this Canvas.
  `Overflow`
  `getOverflow()`
  Controls what happens when the drawn size of the content of a Canvas is either greater or smaller than the specified size of the Canvas.
  `Integer`
  `getPadding()`
  Set the CSS padding of this component, in pixels.
  `int`
  `getPageBottom()`
  Return the page-relative bottom coordinate of this object, in pixels.
  `int`
  `getPageLeft()`
  Returns the page-relative left coordinate of the widget on the page, in pixels.
  `Rectangle`
  `getPageRect()`
  `int`
  `getPageRight()`
  Return the page-relative right coordinate of this object, in pixels.
  `int`
  `getPageTop()`
  Returns the page-relative top coordinate of the widget on the page, in pixels
  `Map`
  `getPaletteDefaults()`
  This method returns a Map of config properties suitable for use as the "defaults" attribute of a `PaletteNode`.
  `Canvas`
  `getPanelContainer()`
  Returns this Canvas's "panel container".
  `Canvas`
  `getParentCanvas()`
  This Canvas's immediate parent, if any.
  `String`
  `getParentCanvasAsString()`
  This Canvas's immediate parent, if any.
  `Canvas`
  `getParentElement()`
  Deprecated.
  As of Smartclient version 9.1, deprecated in favor of `parentCanvas` and `getParentCanvas()`
  `String`
  `getParentElementAsString()`
  Deprecated.
  As of Smartclient version 9.1, deprecated in favor of `parentCanvas` and `getParentCanvas()`
  `Canvas[]`
  `getPeers()`
  Array of all Canvii that are peers of this Canvas.
  `String`
  `getPendingMarkerStyle()`
  CSS class used to apply additional styles to this canvas when `showPendingMarker()` is called, or when `pendingMarkerVisible` has been set.
  `Boolean`
  `getPendingMarkerVisible()`
  This attribute indicates whether the `pending marker class` should be appended to the list of CSS classes applied to this canvas.
  `PercentBoxModel`
  `getPercentBox()`
  Governs the model to be used when sizing canvases with percentage width or height, or positioning widgets with a specified `snapTo`.
  `Canvas`
  `getPercentSource()`
  If this canvas has its size specified as a percentage, this property allows the user to explicitly designate another canvas upon which sizing will be based.
  `Boolean`
  `getPersistentMatchElement()`
  If this canvas has a specified `htmlElement` and `matchElement` is set to true, should the canvas perform a one time resize to fit the target element on draw, or should it continue to match the target element as its size changes due to page reflows?
  `PointerSettings`
  `getPointerSettings()`
  Detail settings of the `pointer` such as where it should be located along the outside of the canvas.
  `String`
  `getPointerTarget()`
  This property in conjunction with the `pointerSettings.snapTo` places the canvas in relation to the target canvas.
  `String`
  `getPointerTargetAsString()`
  This property in conjunction with the `pointerSettings.snapTo` places the canvas in relation to the target canvas.
  `Positioning`
  `getPosition()`
  Absolute or relative, corresponding to the "absolute" (with respect to parent) or "relative" (with respect to document flow) values for the CSS position attribute.
  `String`
  `getPrefix()`
  `Boolean`
  `getPrintChildrenAbsolutelyPositioned()`
  Should this canvas print its children absolutely positioned when generating `printable HTML`.
  `String`
  `getPrintHTML(PrintProperties printProperties, PrintHTMLCallback callback)`
  Retrieves printable HTML for this component and all printable subcomponents.
  `static void`
  `getPrintHTML(Object[] components, PrintProperties printProperties, PrintHTMLCallback callback)`
  Returns print-formatted HTML for the specified list of components.
  `String`
  `getPrintStyleName()`
  The CSS class to apply when printing this widget.
  `String`
  `getPrompt()`
  Prompt displayed in hover canvas if `showHover` is true.
  `String[]`
  `getProportionalResizeModifiers()`
  If `proportionalResizing` is set to `ProportionalResizeMode.MODIFIER` or `ProportionalResizeMode.MODIFIER_OFF` then proportional resizing of the DrawItem is activated or deactivated, respectively, whenever at least one key in this set of modifier keys is pressed.
  `ProportionalResizeMode`
  `getProportionalResizing()`
  If `canDragResize` is true, this property specifies the conditions for when proportional resizing is used.
  `boolean`
  `getReceiveScrollbarEvents()`
  Whether this canvas should receive `events` from its scrollbars, which are `peers`.
  `Rectangle`
  `getRect()`
  Returns the coordinates of this object as an array in left, top, width, height order.
  `Boolean`
  `getRedrawOnResize()`
  Should this element be redrawn in response to a resize?
  `String`
  `getResizeBarTarget()`
  When this Canvas is included as a member in a Layout, and `showResizeBar` is set to `true` so that a resizeBar is created, `resizeBarTarget:"next"` can be set to indicate that the resizeBar should resize the next member of the layout rather than this one.
  `EdgeName[]`
  `getResizeFrom()`
  When drag resizing is enabled via `canDragResize`, restricts resizes to only certain edges or corners.
  `int`
  `getRight()`
  Return the right coordinate of this object as rendered, relative to its enclosing context, in pixels.
  `Map`
  `getRuleContext()`
  Get the current value of the rule context collected by the `ruleScope` of this component (which may be this component itself or whatever component is managing the `ruleScope` for this component).
  `Map`
  `getRuleContext(boolean databoundOnly)`
  Get the current value of the rule context collected by the `ruleScope` of this component (which may be this component itself or whatever component is managing the `ruleScope` for this component).
  `String`
  `getRuleScope()`
  `ID` of the component that gathers the context for evaluation of criteria-based rules specified by properties such as `FormItem.visibleWhen`, Dynamic Properties, and `DynamicCriteria` such as `ListGrid.initialCriteria`.
  `int`
  `getScrollbarSize()`
  How thick should we make the scrollbars for this canvas.
  `int`
  `getScrollBottom()`
  Returns the scrollTop required to scroll vertically to the end of this widget's content.
  `int`
  `getScrollHeight()`
  Returns the scrollable height of the widget's contents, including children, ignoring clipping.
  `int`
  `getScrollLeft()`
  Get the number of pixels this Canvas is scrolled from its left edge.
  `int`
  `getScrollRight()`
  Returns the scrollLeft required to scroll horizontally to the end of this widget's content.
  `int`
  `getScrollTop()`
  Get the number of pixels this Canvas is scrolled from its top edge.
  `int`
  `getScrollWidth()`
  Returns the scrollable width of the widget's contents, including children, ignoring clipping.
  `String`
  `getShadowColor()`
  Color for the css-based drop shadow shown if `useCSSShadow` is true and `showShadow` is true.
  `int`
  `getShadowDepth()`
  Depth of the shadow, or the virtual height above the page of the widget throwing the shadow.
  `Integer`
  `getShadowHOffset()`
  Horizontal offset for the `shadow`.
  `String`
  `getShadowImage()`
  If `useCSSShadow` is false, (or for browsers that do not support css3), this property supplies the base name of the series of images for the sides, corners, and center of the shadow.
  `Integer`
  `getShadowOffset()`
  Offset of the shadow.
  `Integer`
  `getShadowSoftness()`
  Softness, or degree of blurring, of the shadow.
  `Integer`
  `getShadowSpread()`
  Explicit spread for the css-based drop shadow shown if `useCSSShadow` is true and `showShadow` is true.
  `Integer`
  `getShadowVOffset()`
  Vertical offset for the `shadow`.
  `Boolean`
  `getShouldPrint()`
  Whether this canvas should be included in a printable view.
  `boolean`
  `getShowCustomScrollbars()`
  Whether to use the browser's native scrollbars or Smart GWT-based scrollbars.
  `Boolean`
  `getShowDragShadow()`
  When this widget is dragged, if its dragAppearance is `"target"`, should we show a shadow behind the canvas during the drag.
  `Boolean`
  `getShowEdges()`
  Whether an `EdgedCanvas` should be used to show image-based edges around this component.
  `boolean`
  `getShowFocusOutline()`
  For focusable widgets, should the native dotted focus outline be shown, where supported?
  `Boolean`
  `getShowHover()`
  If `this.canHover` is true, should we show the global hover canvas by default when the user hovers over this canvas?
  `Boolean`
  `getShowHoverComponents()`
  When set to true, shows a widget hovering at the mouse point instead of the builtin hover label.
  `Boolean`
  `getShowPointer()`
  Should a pointer be shown? A pointer can be placed on the border to identify the target of the canvas contents.
  `Boolean`
  `getShowResizeBar()`
  When this Canvas is included as a member in a `Layout`, whether a resizeBar should be shown after this member in the layout, to allow it to be resized.
  `Boolean`
  `getShowShadow()`
  Whether to show a drop shadow for this Canvas.
  `Boolean`
  `getShowSnapGrid()`
  Whether to show a snap grid for this Canvas.
  `boolean`
  `getShrinkElementOnHide()`
  This is an advanced setting.
  `Boolean`
  `getSizeMayChangeOnRedraw()`
  Is it possible that a call to `redraw()` on this widget will change its size?
  `String`
  `getSkinImgDir()`
  Default directory for skin images (those defined by the class), relative to the Page-wide `skinDir`.
  `Canvas[]`
  `getSnapAlignCandidates()`
  When `childrenSnapAlign` is enabled, list of candidates to check for alignment.
  `String`
  `getSnapAlignCenterLineStyle()`
  CSS border declaration used for the line shown to indicate snapping to a center line when `childrenSnapAlign` is set.
  `String`
  `getSnapAlignEdgeLineStyle()`
  CSS border declaration used for the line shown to indicate snapping to a edge line when `childrenSnapAlign` is set.
  `String`
  `getSnapAxis()`
  Describes which axes to apply snap-to-grid to.
  `String`
  `getSnapEdge()`
  If `snapTo` is defined to this widget, this property can be used to define which edge of this widget should be snapped to an edge of the master or parent element.
  `DrawLine`
  `getSnapGridLineProperties()`
  Specifies line styling to use when drawing the grid of lines for `SnapGridStyle`: "lines".
  `SnapGridStyle`
  `getSnapGridStyle()`
  Specifies indication style to use for snap points, either a grid of lines or an array of crosses.
  `String`
  `getSnapHDirection()`
  The horizontal snap direction.
  `int`
  `getSnapHGap()`
  The horizontal grid size to use, in pixels, when snap-to-grid is enabled.
  `Integer`
  `getSnapOffsetLeft()`
  If `snapTo` is defined for this widget, this property can be used to specify an offset in px or percentage for the left coordinate of this widget.
  `Integer`
  `getSnapOffsetTop()`
  If `snapTo` is defined for this widget, this property can be used to specify an offset in px or percentage for the top coordinate of this widget.
  `Boolean`
  `getSnapOnDrop()`
  When this canvas is dropped onto an object supporting snap-to-grid, should it snap to the grid (true, the default) or just drop wherever the mouse is (false).
  `static Point`
  `getSnapPosition(Canvas target, String snapTo, Canvas snapper)`
  Return the position for `snapper` to be placed in order to "snap to" an edge or corner of `target`, in the same sense as `snapTo`.
  `static Point`
  `getSnapPosition(Canvas target, String snapTo, Canvas snapper, String snapEdge)`
  Return the position for `snapper` to be placed in order to "snap to" an edge or corner of `target`, in the same sense as `snapTo`.
  `Boolean`
  `getSnapResizeToAlign()`
  Flag to disable snapping to alignment when this Canvas is resized.
  `Boolean`
  `getSnapResizeToGrid()`
  Causes this canvas to snap to its parent's grid when resizing.
  `String`
  `getSnapTo()`
  Position this widget such that it is aligned with ("snapped to") an edge of its `master` (if specified), or its `parent canvas`.
  `Boolean`
  `getSnapToAlign()`
  Flag to disable snapping to alignment when this Canvas is dragged when `childrenSnapAlign` is enabled on this Canvas' parent.
  `Boolean`
  `getSnapToCenterAlign()`
  Flag to disable snapping to center alignment when this Canvas is dragged when `childrenSnapAlign` is enabled on this Canvas' parent.
  `Boolean`
  `getSnapToEdgeAlign()`
  Flag to disable snapping to edge alignment when this Canvas is dragged when `childrenSnapAlign` is enabled on this Canvas' parent.
  `Boolean`
  `getSnapToGrid()`
  Causes this canvas to snap to its parent's grid when dragging.
  `String`
  `getSnapVDirection()`
  The vertical snap direction.
  `int`
  `getSnapVGap()`
  The vertical grid size to use, in pixels, when snap-to-grid is enabled.
  `Boolean`
  `getStartLine()`
  Whether this canvas should always start a new line when used as a tile in a `FlowLayout`.
  `String`
  `getStyleName()`
  The CSS class applied to this widget as a whole.
  `Integer`
  `getTabIndex()`
  If specified this governs the tabIndex of the widget in the page's tab order.
  `DataContext`
  `getTestDataContext()`
  A `DataContext` to be used if no `dataContext` is provided (directly or indirectly via a parent).
  `protected Canvas`
  `getTestInstance()`
  `String`
  `getTitle()`
  Synonym for `getPrompt()`
  `String`
  `getTooltip()`
  Synonym for `getPrompt()`
  `int`
  `getTop()`
  Number of pixels the top of the widget is offset down from its default drawing context (either its parent's top-left corner, or the document flow, depending on the value of the `position` property).
  `String`
  `getTopAsString()`
  Number of pixels the top of the widget is offset down from its default drawing context (either its parent's top-left corner, or the document flow, depending on the value of the `position` property).
  `Canvas`
  `getTopElement()`
  The top-most Canvas (i.e., not a child of any other Canvas), if any, in this widget's containment hierarchy.
  `static Canvas[]`
  `getTopLevelComponents()`
  Returns an array of all top-level `Canvases` that are currently drawn and visible, ordered by zIndex (highest zIndex first).
  `boolean`
  `getUpdateTabPositionOnDraw()`
  Should canvases with no `parent canvas` be moved to the end of the TabIndexManager tree on draw()?
  `boolean`
  `getUpdateTabPositionOnReparent()`
  Should canvases with a `parent canvas` be added to the TabIndexManager under the parent as described in `updateChildTabPositions()` and `updateChildTabPosition()`?
  `Boolean`
  `getUseBackMask()`
  In earlier versions of Internet Explorer (pre IE9), a native limitation exists whereby if HTML elements are overlapping on the page, certain elements can appear to "burn through" elements in the same position with a higher z-index.
  `boolean`
  `getUseCSSShadow()`
  If `showShadow` is true, should we use the css `box-shadow` property (where supported) to achieve the shadow?
  `boolean`
  `getUseDragMask()`
  This flag controls whether we register the component as a maskable item with the EventHandler.
  `boolean`
  `getUseImageForSVG()`
  If set, forces the main SVG image or icon in the canvas to be rendered in an image tag rather than an object tag, the default.
  `Boolean`
  `getUseNativeDrag()`
  If set, native HTML5 drag and drop will be used for all drags initiated on this widget (on browsers where this is supported), and native HTML5 drop events occurring over this widget will be processed.
  `Boolean`
  `getUseOpacityFilter()`
  Configures where the Opacity filter is used for IE6-8.
  `Boolean`
  `getUseTouchScrolling()`
  On `touch devices`, if this `Canvas` can be scrolled, should touch-dragging the content area result in scrolling? Set to `false` if touch-dragging should not cause scrolling.
  `ValuesManager`
  `getValuesManager()`
  `ValuesManager` for managing values displayed in this component.
  `String`
  `getValuesManagerAsString()`
  `ValuesManager` for managing values displayed in this component.
  `int`
  `getViewportHeight()`
  Returns the height of the viewport onto the scrollable content.
  `int`
  `getViewportWidth()`
  Returns the width of the viewport onto the scrollable content.
  `Visibility`
  `getVisibility()`
  Controls widget visibility when the widget is initialized.
  `int`
  `getVisibleHeight()`
  Return the visible height of the Canvas.
  `AdvancedCriteria`
  `getVisibleWhen()`
  Criteria to be evaluated to determine whether this Canvas should be visible.
  `int`
  `getVisibleWidth()`
  Return the visible width of the Canvas.
  `int`
  `getVSnapPosition(int coordinate)`
  Override this method to provide a custom snap-to grid.
  `int`
  `getVSnapPosition(int coordinate, String direction)`
  Override this method to provide a custom snap-to grid.
  `Integer`
  `getWidth()`
  The `canvas.width` attribute specifies the size for a component's horizontal dimension; `canvas.height` specifies the size for the vertical dimension.
  `String`
  `getWidthAsString()`
  `Process[]`
  `getWorkflows()`
  List of screen-global `workflows` that can be shared by event handler workflows using a `StartProcessTask`.
  `int`
  `getZIndex()`
  Get the z-Index of this canvas.
  `int`
  `getZIndex(boolean resolveToNumber)`
  Get the z-Index of this canvas.
  `void`
  `handleHover()`
  Handler fired on a delay when the user hovers the mouse over this hover-target.
  `void`
  `hide()`
  Sets the widget's CSS visibility attribute to "hidden".
  `void`
  `hideClickMask()`
  Hides the click mask associated with this canvas.
  `void`
  `hideClickMask(String ID)`
  Hides the click mask associated with this canvas.
  `void`
  `hideComponentMask()`
  Hide the `component level clickMask` for this widget
  `void`
  `hideComponentMask(boolean suppressFocusReset)`
  Hide the `component level clickMask` for this widget
  `void`
  `hideContextMenu()`
  The default implementation of this method hides the contextMenu currently being shown for this component (which occurs when the mouse button that toggles the context menu is released).
  `static String`
  `imgHTML(String src)`
  Generates the HTML for an image unique to this Canvas.
  `static String`
  `imgHTML(String src, int width, int height)`
  `static String`
  `imgHTML(String src, int width, int height, String name, String extraStuff, String imgDir)`
  Generates the HTML for an image unique to this Canvas.
  `void`
  `initComplete()`
  Notification method fired after `initWidget()`, when canvas initialization is complete.
  `Boolean`
  `intersects(Canvas other)`
  Returns true if the rectangles of this widget and the specified widget overlap.
  `Boolean`
  `isDirty()`
  Returns whether a canvas is waiting to be redrawn.
  `Boolean`
  `isDisabled()`
  Is this canvas disabled? Note that the disabled state is inherited - this method will return true if this widget, or any of its ancestors are marked disabled.
  `Boolean`
  `isFocused()`
  Returns true if this Canvas has the keyboard focus.
  `boolean`
  `isVisible()`
  Returns true if the widget is visible, taking all parents into account, so that a widget which is not hidden might still report itself as not visible if it is within a hidden parent.
  `Boolean`
  `keyUp()`
  Executed when a key is released on a focusable widget (`canFocus`: true).
  `void`
  `layoutChildren(String reason)`
  `layoutChildren()` is where a Canvas should implement a sizing policy for it's Canvas children.
  `String`
  `linkHTML(String href)`
  Generates the HTML for a standard link (anchor) element.
  `String`
  `linkHTML(String href, String text)`
  See `linkHTML()`
  `String`
  `linkHTML(String href, String text, String target)`
  See `linkHTML()`
  `String`
  `linkHTML(String href, String text, String target, String ID)`
  See `linkHTML()`
  `String`
  `linkHTML(String href, String text, String target, String ID, Integer tabIndex)`
  See `linkHTML()`
  `String`
  `linkHTML(String href, String text, String target, String ID, Integer tabIndex, String accessKey)`
  Generates the HTML for a standard link (anchor) element.
  `void`
  `markForDestroy()`
  `destroy()` this canvas on a timeout.
  `void`
  `markForRedraw()`
  Marks the widget as "dirty" so that it will be added to a queue for redraw.
  `void`
  `markForRedraw(String reason)`
  Marks the widget as "dirty" so that it will be added to a queue for redraw.
  `void`
  `moveAbove(Canvas canvas)`
  Puts this widget just above the specified widget in the stacking order, so it appears in front of the specified widget if both widgets have the same parent.
  `void`
  `moveBelow(Canvas canvas)`
  Puts this widget just below the specified widget in the stacking order, so it appears behind the specified widget if both widgets have the same parent.
  `Boolean`
  `moveBy(int deltaX, int deltaY)`
  Moves the widget deltaX pixels to the right and deltaY pixels down.
  `boolean`
  `moveTo(int left, int top)`
  Moves the widget so that its top-left corner is at the specified coordinates.
  `protected void`
  `onAttach()`
  `protected void`
  `onDetach()`
  `protected void`
  `onInit()`
  `void`
  `pageScrollDown()`
  This method is the programmatic equivalent of the user pressing the "Page Down" key while this widget has the focus.
  `void`
  `pageScrollUp()`
  This method is the programmatic equivalent of the user pressing the "Page Up" key while this widget has the focus.
  `protected void`
  `parentResized()`
  Fires when the interior size of the parent changes, including parent resize and scrollbar introduction or removal.
  `void`
  `placeNear()`
  Move this canvas to the specified point, or as close to the specified point as possible without this widget extending beyond the edge of the browser viewport on any side.
  `void`
  `placeNear(int left)`
  See `placeNear()`
  `void`
  `placeNear(int left, int top)`
  Move this canvas to the specified point, or as close to the specified point as possible without this widget extending beyond the edge of the browser viewport on any side.
  `void`
  `print()`
  Generate and show a `PrintWindow` containing a `PrintCanvas` showing a printable view of this component.
  `void`
  `print(PrintProperties printProperties)`
  See `print()`
  `void`
  `print(PrintProperties printProperties, PrintWindow printWindowProperties)`
  See `print()`
  `void`
  `print(PrintProperties printProperties, PrintWindow printWindowProperties, String callback)`
  Generate and show a `PrintWindow` containing a `PrintCanvas` showing a printable view of this component.
  `static void`
  `printComponents(Object[] components)`
  Generate printable HTML for the designated components and trigger the native print dialog, without ever showing the printable HTML to the user.
  `void`
  `provideRuleContext(String dataPath, Object data)`
  Provide data to the `com.smartgwt.client.widgets.Canvas#ruleScope` component, to be made available in the rule context at the specified `path`.
  `void`
  `provideRuleContext(String dataPath, Object data, DataBoundComponent dbc)`
  Provide data to the `com.smartgwt.client.widgets.Canvas#ruleScope` component, to be made available in the rule context at the specified `path`.
  `void`
  `redraw()`
  Redraws the widget immediately with its current property values.
  `void`
  `redraw(String reason)`
  Redraws the widget immediately with its current property values.
  `static void`
  `registerFontScaledPaddingStyles(String[] scaledStyles, String[] baselineStyles, int targetSizeChange)`
  Registers one or more CSS classes to have their padding adjusted (independently on all edges) according to the `padding size change` applied to the page.
  `void`
  `removeChild(Canvas child)`
  Remove a child from this parent.
  `void`
  `removeChild(Canvas child, String name)`
  Remove a child from this parent.
  `void`
  `removePeer(Canvas peer)`
  Remove a peer from this Canvas
  `void`
  `removePeer(Canvas peer, String name)`
  Remove a peer from this Canvas
  `void`
  `removeRuleContext(String path)`
  Remove data in the rule context at the specified `path` along with any user-provided schema.
  `void`
  `removeSnapAlignCandidate(Canvas candidate)`
  Remove a candidate from `snapAlignCandidates`.
  `static void`
  `resizeAutoChildAttributes(String policy, int delta)`
  Change the value of attributes registered via `registerAutoChildSizingAttributes()` by some number of pixels.
  `Boolean`
  `resizeBy(int deltaX, int deltaY)`
  Resizes the widget, adding deltaX to its width and deltaY to its height (moves the right and/or bottom sides of the widget).
  `static void`
  `resizeControls(int delta)`
  Change the basic size of UI components in the current skin by "delta" pixels.
  `static void`
  `resizeControlsTo(int targetDelta)`
  Resizes controls as if calling `resizeControls()`, but takes a final target size instead of a delta representing the change from a current size.
  `static void`
  `resizeFonts(int sizeChange)`
  Modify the size of fonts for some or all stylesheets defined in the page.
  `static void`
  `resizeFonts(int sizeChange, String styleSheets)`
  See `resizeFonts()`
  `static void`
  `resizeFonts(int sizeChange, String styleSheets, Boolean resizeRelatedControls)`
  Modify the size of fonts for some or all stylesheets defined in the page.
  `static void`
  `resizeFontsTo(int targetDelta)`
  Resizes fonts as if calling `resizeFonts()`, but takes a final target size instead of a delta representing the change from a current size.
  `static void`
  `resizeIcons(String policy, int delta)`
  Change the basic size of icons in the current skin by "delta" pixels.
  `static void`
  `resizePadding(int fontSizeChange)`
  Modify the amount of padding for some CSS styles defined for the page.
  `static void`
  `resizePadding(int fontSizeChange, String styleSheets)`
  Modify the amount of padding for some CSS styles defined for the page.
  `Boolean`
  `resizeTo(int width, int height)`
  Resizes the widget to the specified width and height (moves the right and/ or bottom sides of the widget).
  `Boolean`
  `resizeTo(String width, String height)`
  Resizes the widget to the specified width and height (moves the right and/ or bottom sides of the widget).
  `void`
  `revealChild(Canvas child)`
  Reveals the child Canvas passed in by showing it if it is currently hidden (note, this is stub functionality, certain Canvas subclasses such as `TabSet` have more useful implementations) NOTE: This is an override point.
  `void`
  `revealChild(String childID)`
  Reveals the child Canvas passed in by showing it if it is currently hidden (note, this is stub functionality, certain Canvas subclasses such as `TabSet` have more useful implementations) NOTE: This is an override point.
  `void`
  `scrollBy(int dX, int dY)`
  Scroll this widget by some pixel increment in either (or both) direction(s).
  `void`
  `scrollByPercent(int dX, int dY)`
  Scroll this widget by some percentage of scroll size in either (or both) direction(s).
  `void`
  `scrollTo()`
  Scrolls the content of the widget so that the origin (top-left corner) of the content is left pixels to the left and top pixels above the widget's top-left corner (but still clipped by the widget's dimensions).
  `void`
  `scrollTo(Double left)`
  Scrolls the content of the widget like `scrollTo()`, but with a full-precision double offset so that numerical error can be avoided in situations where it otherwise may accumulate in calculations.
  `void`
  `scrollTo(Double left, Double top)`
  Scrolls the content of the widget like `scrollTo()`, but with full-precision double offsets so that numerical error can be avoided in situations where it otherwise may accumulate in calculations.
  `void`
  `scrollTo(Integer left)`
  See `scrollTo()`
  `void`
  `scrollTo(Integer left, Integer top)`
  Scrolls the content of the widget so that the origin (top-left corner) of the content is left pixels to the left and top pixels above the widget's top-left corner (but still clipped by the widget's dimensions).
  `void`
  `scrollToBottom()`
  Vertically scrolls the content of the widget to the end of its content
  `void`
  `scrollToLeft()`
  Horizontally scrolls the content of the widget to 0
  `void`
  `scrollToPercent(int left, int top)`
  Scroll this widget to some position specified as a percentage of scroll size in either (or both) direction(s).
  `void`
  `scrollToRight()`
  Horizontally scrolls the content of the widget to the end of its content
  `void`
  `scrollToTop()`
  Vertically scrolls the content of the widget to 0
  `void`
  `sendToBack()`
  Puts this widget at the bottom of the stacking order, so it appears behind all other widgets in the same parent.
  `Canvas`
  `setAccessKey(String accessKey)`
  If specified this governs the HTML accessKey for the widget.
  `Canvas`
  `setAdaptHeightByCustomizer(AdaptHeightByCustomizer customizer)`
  Set customizer that defines `adaptHeightBy`.
  `Canvas`
  `setAdaptiveHeightPriority(Integer adaptiveHeightPriority)`
  See `adaptiveWidthPriority`.
  `Canvas`
  `setAdaptiveWidthPriority(Integer adaptiveWidthPriority)`
  If multiple widgets in the same Layout have `adaptive width`, `adaptiveWidthPriority` can be set to indicate which of the components should be given priority access to space.
  `Canvas`
  `setAdaptWidthByCustomizer(AdaptWidthByCustomizer customizer)`
  Set customizer that defines `adaptWidthBy`.
  `Canvas`
  `setAlign(Alignment align)`
  `static void`
  `setAllowExternalFilters(boolean allExternalFilters)`
  Changes the system-wide `allowExternalFilters` setting.
  `Canvas`
  `setAlwaysManageFocusNavigation(Boolean alwaysManageFocusNavigation)`
  Should focus navigation for this canvas and its descendents be handled explicitly by intercepting "Tab" key events and calling the `TabIndexManager.shiftFocus()` API?
  `Canvas`
  `setAlwaysShowScrollbars(Boolean alwaysShowScrollbars)`
  Should this browser always show custom scrollbars if `showCustomScrollbars` is true?
  `Canvas`
  `setAnimateAcceleration(AnimationAcceleration animateAcceleration)`
  Default acceleration effect to apply to all animations on this Canvas.
  `Canvas`
  `setAnimateFadeTime(Integer animateFadeTime)`
  Default time for performing an animated fade.
  `Canvas`
  `setAnimateHideAcceleration(AnimationAcceleration animateHideAcceleration)`
  Default acceleration function for performing an animated hide.
  `Canvas`
  `setAnimateHideEffect(AnimationEffect animateHideEffect)`
  Default animation effect to use if `animateHide()` is called without an explicit effect parameter.
  `Canvas`
  `setAnimateHideTime(Integer animateHideTime)`
  Default time for performing an animated hide.
  `Canvas`
  `setAnimateMoveAcceleration(AnimationAcceleration animateMoveAcceleration)`
  Default acceleration effect for performing an animated move.
  `Canvas`
  `setAnimateMoveTime(Integer animateMoveTime)`
  Default time for performing an animated move.
  `Canvas`
  `setAnimateRectAcceleration(AnimationAcceleration animateRectAcceleration)`
  Default acceleration function for performing an animated move and resize.
  `Canvas`
  `setAnimateRectTime(Integer animateRectTime)`
  Default time for performing an animated setRect.
  `Canvas`
  `setAnimateResizeAcceleration(AnimationAcceleration animateResizeAcceleration)`
  Default acceleration function for performing an animated resize.
  `Canvas`
  `setAnimateResizeLayoutMode(AnimationLayoutMode animateResizeLayoutMode)`
  When to update the `child layout` for a `size animation`.
  `Canvas`
  `setAnimateResizeTime(Integer animateResizeTime)`
  Default time for performing an animated resize.
  `Canvas`
  `setAnimateScrollAcceleration(AnimationAcceleration animateScrollAcceleration)`
  Default acceleration function for performing an animated scroll.
  `Canvas`
  `setAnimateScrollTime(Integer animateScrollTime)`
  Default time for performing an animated scroll.
  `Canvas`
  `setAnimateShowAcceleration(AnimationAcceleration animateShowAcceleration)`
  Default acceleration function for performing an animated show.
  `Canvas`
  `setAnimateShowEffect(AnimationEffect animateShowEffect)`
  Default animation effect to use if `animateShow()` is called without an explicit effect parameter.
  `Canvas`
  `setAnimateShowTime(Integer animateShowTime)`
  Default time for performing an animated show.
  `Canvas`
  `setAnimateTime(int animateTime)`
  Default total duration of animations.
  `Canvas`
  `setAppImgDir(String appImgDir)`
  Default directory for app-specific images, relative to the Page-wide `appImgDir`.
  `Canvas`
  `setAriaRole(String ariaRole)`
  ARIA role of this component.
  `Canvas`
  `setAriaState(String stateName, Object stateValue)`
  Set a specific ARIA state mapping for this component.
  `Canvas`
  `setAutoChildConstructor(String autoChildName, String className)`
  Sets the SmartClient constructor for the AutoChild named `autoChildName`.
  `Canvas`
  `setAutoChildProperties(String autoChildName, EditContext properties)`
  Sets the properties for creating an AutoChild named `autoChildName`.
  `Canvas`
  `setAutoChildProperties(String autoChildName, EditProxy properties)`
  Sets the properties for creating an AutoChild named `autoChildName`.
  `Canvas`
  `setAutoChildProperties(String autoChildName, Canvas properties)`
  Sets the properties for creating a `Canvas` AutoChild named `autoChildName`.
  `Canvas`
  `setAutoChildProperties(String autoChildName, FormItem properties)`
  Sets the properties for creating a `FormItem` AutoChild named `autoChildName`.
  `Canvas`
  `setAutoChildVisibility(String autoChildName, boolean visible)`
  Sets whether to create and show the AutoChild named `autoChildName`.
  `Canvas`
  `setAutoHeight()`
  Set the minimum value for height.
  `Canvas`
  `setAutoMaskComponents(Boolean autoMaskComponents)`
  Deprecated.
  As of Smart GWT version 10.0, deprecated in favor of `EditProxy.autoMaskChildren`
  `Canvas`
  `setAutoParent(String autoParent)`
  This initialization property allows developers to create a canvas using the Class.addAutoChild() method, and have it added as a child to some other component.
  `Canvas`
  `setAutoPopulateData(Boolean autoPopulateData)`
  If a `dataContext` is provided, should subcomponents automatically bind to the data?
  `static void`
  `setAutoResizeAutoChildAttributes(boolean autoResize)`
  Should registered autoChild attributes be automatically resized with `controls` and `text`?
  `static void`
  `setAutoResizeIcons(boolean autoResizeIcons)`
  Should icons be automatically resized with `controls` and `text`?
  `Canvas`
  `setAutoShowParent(Boolean autoShowParent)`
  If set to true, the widget's parent (if any) will automatically be shown whenever the widget is shown.
  `Canvas`
  `setAutoWidth()`
  Set the minimum value for width.
  `Canvas`
  `setBackgroundColor(String backgroundColor)`
  The background color for this widget.
  `Canvas`
  `setBackgroundImage(String backgroundImage)`
  URL for a background image for this widget (corresponding to the CSS "background-image" attribute).
  `Canvas`
  `setBackgroundPosition(String backgroundPosition)`
  Specifies how the background image should be positioned on the widget.
  `Canvas`
  `setBackgroundRepeat(BackgroundRepeat backgroundRepeat)`
  Specifies how the background image should be tiled if this widget is larger than the image.
  `Canvas`
  `setBorder(String border)`
  Set the CSS border of this component, as a CSS string including border-width, border-style, and/or color (eg "2px solid blue").
  `Canvas`
  `setBorderRadius(String borderRadius)`
  The CSS border-radius for this widget.
  `void`
  `setBottom(int bottom)`
  Resizes the widget vertically to position its bottom edge at the specified coordinate.
  `Canvas`
  `setCanAcceptDrop(Boolean canAcceptDrop)`
  Indicates that this object can receive dropped widgets (i.e.
  `Canvas`
  `setCanAdaptHeight(Boolean canAdaptHeight)`
  See `canAdaptWidth`.
  `Canvas`
  `setCanAdaptWidth(Boolean canAdaptWidth)`
  Indicates that this component is able to render itself at multiple possible sizes, in order to fit into less space when very little space is available, or to display more information or provide more immediate access to functionality when more space is available.
  `Canvas`
  `setCanDrag(Boolean canDrag)`
  Indicates whether this widget can initiate custom drag-and-drop operations (other than reposition or resize).
  `Canvas`
  `setCanDragReposition(Boolean canDragReposition)`
  Indicates whether this widget can be moved by a user of your application by simply dragging with the mouse.
  `Canvas`
  `setCanDragResize(Boolean canDragResize)`
  Indicates whether this widget can be resized by dragging on the edges and/or corners of the widget with the mouse.
  `Canvas`
  `setCanDragScroll(boolean canDragScroll)`
  If this Canvas is canAcceptDrop:true, when the user drags a droppable widget over an edge of the widget, should we scroll to show the rest of the widget's content? Returned from canvas.shouldDragScroll() if there are scrollbars.
  `Canvas`
  `setCanDrop(Boolean canDrop)`
  Indicates that this object can be dropped on top of other widgets.
  `Canvas`
  `setCanDropBefore(Boolean canDropBefore)`
  When explicitly set to false, disallows drop before this member in the Layout.
  `Canvas`
  `setCanFocus(Boolean canFocus)`
  Can this widget be allowed to become the target of keyboard events?
  `Canvas`
  `setCanHover(Boolean canHover)`
  Will this Canvas fire hover events when the user hovers over it, or one of its children?
  `Canvas`
  `setCanSelectText(Boolean canSelectText)`
  Whether native drag selection of contained text is allowed within this Canvas.
  `Canvas`
  `setChildren(Canvas... children)`
  Array of all Canvii that are immediate children of this Canvas.
  `Canvas`
  `setChildrenResizeSnapAlign(Boolean childrenResizeSnapAlign)`
  Flag to disable snapping to alignment when children of this Canvas are resized
  `Canvas`
  `setChildrenSnapAlign(Boolean childrenSnapAlign)`
  If enabled while `childrenSnapToGrid` is enabled, children dragged within this Canvas will also snap to positions where their edges or center lines would be aligned with the edges or centers of other components, and lines will be shown to point out the possible alignment (with appearance controlled by `snapAlignCenterLineStyle` and `snapAlignEdgeLineStyle` respectively.
  `Canvas`
  `setChildrenSnapCenterAlign(Boolean childrenSnapCenterAlign)`
  See `childrenSnapAlign`.
  `Canvas`
  `setChildrenSnapEdgeAlign(Boolean childrenSnapEdgeAlign)`
  See `childrenSnapAlign`.
  `Canvas`
  `setChildrenSnapResizeToGrid(Boolean childrenSnapResizeToGrid)`
  If true, causes this canvas's children to snap to its grid when resizing.
  `Canvas`
  `setChildrenSnapToGrid(Boolean childrenSnapToGrid)`
  If true, causes this canvas's children to snap to its grid when dragging.
  `Canvas`
  `setComponentMaskDefaults(Canvas componentMaskDefaults)`
  Defaults for the `componentMask` autoChild.
  `Canvas`
  `setContents(String contents)`
  The contents of a canvas or label widget.
  `Canvas`
  `setContextMenu(Menu contextMenu)`
  Context menu to show for this object, an instance of the Menu widget.
  `Canvas`
  `setCorrectZoomOverflow(Boolean correctZoomOverflow)`
  Whether the Framework should correct for erroneous scrollHeight and scrollWidth values reported by the browser when zoomed (via browser or OS-level zoom) by allowing `maxZoomOverflowError` of overflow before enabling scrolling and displaying custom scrollbars.
  `Canvas`
  `setCursor(Cursor cursor)`
  Specifies the css cursor image to display when the mouse pointer is over this component.
  `Canvas`
  `setDataContext(DataContext dataContext)`
  A mapping from `DataSource` IDs to specific `Records` from those DataSources, that `DataBoundComponents` contained within this Canvas should automatically bind to if a DataSource is provided but data is not provided (directly or indirectly, for example, indirectly via setting `ListGrid.autoFetchData`.
  `Canvas`
  `setDataPath(String dataPath)`
  A dataPath may be specified on any canvas.
  `Canvas`
  `setDefaultHeight(int defaultHeight)`
  For custom components, establishes a default height for the component.
  `static Canvas`
  `setDefaultNativeAutoHideScrollbars(boolean autoHideNativeScrollbars)`
  In some platform/browser configurations, scrollable regions do not show visible scrollbars until the user attempts to interact with the region.
  `static void`
  `setDefaultPageSpace(int newDefaultPageSpace)`
  Changes the global `defaultPageSpace`.
  `static void`
  `setDefaultProperties(Canvas canvasProperties)`
  Class level method to set the default properties of this class.
  `static Canvas`
  `setDefaultShowCustomScrollbars(boolean showCS)`
  Whether to use the browser's native scrollbars or SmartClient-based scrollbars by default for all canvases.
  `Canvas`
  `setDefaultWidth(int defaultWidth)`
  For custom components, establishes a default width for the component.
  `Canvas`
  `setDefiningProperty(String definingProperty)`
  This attribute denotes the name of a property to use as a `getDefiningPropertyName()` for this property when generating and resolving `AutoTest locators with search segments`.
  `Canvas`
  `setDefiningPropertyNameOptions(String... definingPropertyNameOptions)`
  If no explicit `definingProperty` was specified for this component, this array denotes a list of options to use as a `defining property` when generating and resolving `AutoTest locators with search segments`.
  `Canvas`
  `setDisabled(boolean disabled)`
  If set to true, the widget will be disabled.
  `Canvas`
  `setDisabledCursor(Cursor disabledCursor)`
  Specifies the cursor image to display when the mouse pointer is over this widget if this widget is disabled.
  `Canvas`
  `setDisableTouchScrollingForDrag(Boolean disableTouchScrollingForDrag)`
  Disables `useTouchScrolling` whenever a built-in drag operation has been enabled which is known to be non-functional if touch scrolling is enabled.
  `Canvas`
  `setDoubleClickDelay(int doubleClickDelay)`
  Amount of time (in milliseconds) between which two clicks are considered a single click
  `Canvas`
  `setDragAppearance(DragAppearance dragAppearance)`
  Visual appearance to show when the object is being dragged.
  `Canvas`
  `setDragIntersectStyle(DragIntersectStyle dragIntersectStyle)`
  This indicates how the system will test for droppable targets: either by intersection with the mouse or intersection with the rectangle of the dragMoveTarget.
  `Canvas`
  `setDragMaskType(DragMaskType dragMaskType)`
  This property controls what kind of mask is used in case `useDragMask` is enabled.
  `Canvas`
  `setDragMaxHeight(int dragMaxHeight)`
  Sets maximum height that this Canvas can be resized to by a user.
  `Canvas`
  `setDragMaxWidth(int dragMaxWidth)`
  Maximum width that this Canvas can be resized to by a user.
  `Canvas`
  `setDragMinHeight(int dragMinHeight)`
  Minimum height that this Canvas can be resized to by a user.
  `Canvas`
  `setDragMinWidth(int dragMinWidth)`
  Minimum width that this Canvas can be resized to by a user.
  `Canvas`
  `setDragOpacity(Integer dragOpacity)`
  If this widget has dragAppearance `"target"`, this value specifies the opacity to render the target while it is being dragged.
  `Canvas`
  `setDragRepositionAppearance(DragAppearance dragRepositionAppearance)`
  If `canDragReposition` is true, this attribute specifies the visual appearance to show during drag reposition.
  `Canvas`
  `setDragRepositionCursor(Cursor dragRepositionCursor)`
  Cursor to switch to if the mouse is over a widget that is drag repositionable.
  `Canvas`
  `setDragResizeAppearance(DragAppearance dragResizeAppearance)`
  If `canDragResize` is true, this attribute specifies the visual appearance to show during drag resize.
  `Canvas`
  `setDragScrollDelay(int dragScrollDelay)`
  If this widget supports drag-scrolling, This property specifies how many ms the user must hover over the drag-scroll threshold before scrolling begins.
  `Canvas`
  `setDragStartDistance(int dragStartDistance)`
  Number of pixels the cursor needs to move before the EventHandler starts a drag operation.
  `Canvas`
  `setDragTarget(Canvas dragTarget)`
  A different widget that should be actually dragged when dragging initiates on this widget.
  `Canvas`
  `setDragTarget(String dragTarget)`
  A different widget that should be actually dragged when dragging initiates on this widget.
  `Canvas`
  `setDragType(String dragType)`
  Sets a `dragType` for this widget used, to be compared to `dropTypes` on possible drop target widgets.
  `Canvas`
  `setDropTarget(Canvas dropTarget)`
  Delegates a different widget that should actually be dropped on if the cursor is over this widget when the drop completes.
  `Canvas`
  `setDropTarget(String dropTarget)`
  Delegates a different widget that should actually be dropped on if the cursor is over this widget when the drop completes.
  `Canvas`
  `setDropTypes(String dropTypes)`
  When a drag and drop interaction occurs, if a `dragType` is configured on the source widget, it is compared to the `dropTypes` configured on the target widget, and a drop is only allowed if the `dragType` is listed in the target widget's `dropTypes` array.
  `Canvas`
  `setDropTypes(String... dropTypes)`
  When a drag and drop interaction occurs, if a `dragType` is configured on the source widget, it is compared to the `dropTypes` configured on the target widget, and a drop is only allowed if the `dragType` is listed in the target widget's `dropTypes` array.
  `Canvas`
  `setDynamicContents(Boolean dynamicContents)`
  Dynamic contents allows the contents string to be treated as a simple but powerful template.
  `Canvas`
  `setEdgeBackgroundColor(String edgeBackgroundColor)`
  Background color for the EdgedCanvas created to decorate this component.
  `Canvas`
  `setEdgeCenterBackgroundColor(String edgeCenterBackgroundColor)`
  Background color for the center section only.
  `Canvas`
  `setEdgeImage(String edgeImage)`
  Base name of images for edges.
  `Canvas`
  `setEdgeMarginSize(int edgeMarginSize)`
  How far into the edge of an object do we consider the "edge" for drag resize purposes?
  `Canvas`
  `setEdgeOffset(Integer edgeOffset)`
  Amount the contained Canvas should be offset.
  `Canvas`
  `setEdgeOpacity(Integer edgeOpacity)`
  Opacity of the edges.
  `Canvas`
  `setEdgeShowCenter(Boolean edgeShowCenter)`
  Whether to show media in the center section, that is, behind the decorated Canvas.
  `Canvas`
  `setEdgeSize(int edgeSize)`
  Size in pixels for corners and edges
  `void`
  `setEditMode(boolean editingOn)`
  Enable or disable edit mode for this component.
  `void`
  `setEditMode(boolean editingOn, EditContext editContext)`
  See `setEditMode()`
  `void`
  `setEditMode(boolean editingOn, EditContext editContext, EditNode editNode)`
  Enable or disable edit mode for this component.
  `Canvas`
  `setEditProxyConstructor(String editProxyConstructor)`
  Default class used to construct the `EditProxy` for this component when the component is `first placed into edit mode`.
  `protected void`
  `setElement(Element elem)`
  Normal usage of SmartGWT is to call draw() on SmartGWT widgets, not to use use RootPanel.add().
  `Canvas`
  `setEnableWhen(AdvancedCriteria enableWhen)`
  Criteria to be evaluated to determine whether this Canvas should be enabled.
  `Canvas`
  `setEndLine(Boolean endLine)`
  Whether this canvas should end the line it's in when used as a tile in a `FlowLayout`.
  `Canvas`
  `setExtraSpace(int extraSpace)`
  When this Canvas is included as a member in a Layout, extra blank space that should be left after this member in a Layout.
  `Canvas`
  `setFacetId(String facetId)`
  If a Canvas is dropped onto a `CubeGrid`, and it has a facetId property specified then the Cube treats this as adding that facetId at the drop location.
  `Canvas`
  `setFloatingScrollbars(boolean floatingScrollbars)`
  If `showCustomScrollbars` is true, should the scrollbars be drawn floating over the component handle, or should the handle shrink to accommodate them?
  `Canvas`
  `setForwardSVGeventsToObject(Boolean forwardSVGeventsToObject)`
  If true, events sent to the SVG inside an object tag are forwarded to the object itself by Framework handlers.
  `Canvas`
  `setGroupBorderCSS(String groupBorderCSS)`
  Sets the style for the grouping frame around the canvas.
  `Canvas`
  `setGroupLabelBackgroundColor(String groupLabelBackgroundColor)`
  If set, the background color of the grouping label.
  `Canvas`
  `setGroupLabelStyleName(String groupLabelStyleName)`
  Sets the style for the grouping label.
  `Canvas`
  `setGroupPadding(Integer groupPadding)`
  Padding to apply inside the border when this canvas is showing a group `border and label`.
  `Canvas`
  `setGroupTitle(String groupTitle)`
  The title/label for the grouping.
  `Canvas`
  `setHeight(int height)`
  `Canvas`
  `setHeight(Integer height)`
  The `canvas.width` attribute specifies the size for a component's horizontal dimension; `canvas.height` specifies the size for the vertical dimension.
  `void`
  `setHeight(String height)`
  The `canvas.width` attribute specifies the size for a component's horizontal dimension; `canvas.height` specifies the size for the vertical dimension.
  `Canvas`
  `setHeight100()`
  Convenience method that sets the height to 100%.
  `Canvas`
  `setHideUsingDisplayNone(boolean hideUsingDisplayNone)`
  When this widget is hidden (see `visibility` and `hide()`), should display:none be applied to the `outer element`?
  `Canvas`
  `setHoverAlign(Alignment hoverAlign)`
  If `this.showHover` is true, this property can be used to customize the alignment of content in the hover canvas.
  `Canvas`
  `setHoverAutoDestroy(Boolean hoverAutoDestroy)`
  If `this.showHover` is true and `getHoverComponent()` is implemented, should the hoverCanvas returned from it be automatically destroyed when it is hidden?
  `Canvas`
  `setHoverAutoFitMaxWidth(int hoverAutoFitMaxWidth)`
  Maximum auto-fit width for a hover if `hoverAutoFitWidth` is enabled.
  `Canvas`
  `setHoverAutoFitMaxWidth(String hoverAutoFitMaxWidth)`
  Maximum auto-fit width for a hover if `hoverAutoFitWidth` is enabled.
  `Canvas`
  `setHoverAutoFitWidth(Boolean hoverAutoFitWidth)`
  if `showHover` is true, this property will cause the specified `hoverWidth` to be treated as a minimum width for the hover.
  `Canvas`
  `setHoverDelay(int hoverDelay)`
  If `this.canHover` is true, how long should the mouse be kept over this widget before the hover event is fired
  `Canvas`
  `setHoverFocusKey(String hoverFocusKey)`
  For canvases `showing a hover`, this attribute gives users a way to pin the hover in place so they can interact with it (scroll it, click embedded links, etc).
  `Canvas`
  `setHoverHeight(Integer hoverHeight)`
  If `this.showHover` is true, this property can be used to customize the height of the hover canvas shown.
  `Canvas`
  `setHoverMoveWithMouse(Boolean hoverMoveWithMouse)`
  If `this.showHover` is true, should this widget's hover canvas be moved with the mouse while visible?
  `Canvas`
  `setHoverOpacity(Integer hoverOpacity)`
  If `this.showHover` is true, should the hover canvas be shown with opacity other than 100?
  `Canvas`
  `setHoverPersist(HoverPersistMode hoverPersist)`
  Allows interaction with hovers when the cursor is positioned over them.
  `Canvas`
  `setHoverScreen(String hoverScreen)`
  Screen to create (via `createScreen()`) in lieu of calling `getHoverComponent()`.
  `Canvas`
  `setHoverStyle(String hoverStyle)`
  If `this.showHover` is true, this property can be used to specify the css style to apply to the hover canvas.
  `Canvas`
  `setHoverVAlign(VerticalAlignment hoverVAlign)`
  If `this.showHover` is true, this property can be used to customize the vertical alignment of content in the hover canvas.
  `Canvas`
  `setHoverWidth(int hoverWidth)`
  If `this.showHover` is true, this property can be used to customize the width of the hover canvas shown.
  `Canvas`
  `setHoverWrap(Boolean hoverWrap)`
  If `this.showHover` is true, this property can be used to customize the whether content in the hover canvas is displayed in a single line, or wraps.
  `Canvas`
  `setHtmlElement(Element htmlElement)`
  If specified as a pointer to an HTML element present in the DOM, this canvas will be rendered inside that element on `draw()`.
  `Canvas`
  `setHtmlElement(String htmlElement)`
  If specified as a pointer to an HTML element present in the DOM, this canvas will be rendered inside that element on `draw()`.
  `Canvas`
  `setHtmlPosition(DrawPosition htmlPosition)`
  If `htmlElement` is specified, this attribute specifies the position where the canvas should be inserted relative to the `htmlElement` in the DOM.
  `void`
  `setImage(String identifier, String URL)`
  Set the URL of an image or SVG object element by name.
  `void`
  `setImage(String identifier, String URL, String imgDir)`
  Set the URL of an image or SVG object element by name.
  `void`
  `setInitHandler(CanvasInitHandler initHandler)`
  Specify a notification method to fire when this Canvas is initialized in JavaScript.
  `Canvas`
  `setIsGroup(boolean isGroup)`
  Should a grouping frame be shown around this canvas if a non-empty string has been specified for `groupTitle`.
  `Canvas`
  `setIsRuleScope(Boolean isRuleScope)`
  Marks this Canvas as the `ruleScope` that will be discovered by any contained `DataBoundComponent`s which do not specify an explicit `ruleScope`.
  `Canvas`
  `setIsSnapAlignCandidate(Boolean isSnapAlignCandidate)`
  Flag to disable snapping to alignment against this Canvas when other Canvases dragged into the same parent when `childrenSnapAlign` is enabled on this Canvas' parent.
  `Canvas`
  `setKeepInParentRect(Rectangle rectangle)`
  `Canvas`
  `setKeepInParentRect(Boolean keepInParentRect)`
  Constrains drag-resizing and drag-repositioning of this canvas to either the rect of its parent (if set to true) or an arbitrary rect based on its parent (if set to a [Left,Top,Width,Height] rect array).
  `Canvas`
  `setKeepInParentRect(Integer... keepInParentRect)`
  Constrains drag-resizing and drag-repositioning of this canvas to either the rect of its parent (if set to true) or an arbitrary rect based on its parent (if set to a [Left,Top,Width,Height] rect array).
  `Canvas`
  `setLayoutAlign(Alignment layoutAlign)`
  When this Canvas is included as a member in a Layout, layoutAlign controls alignment on the breadth axis of the layout.
  `Canvas`
  `setLayoutAlign(VerticalAlignment layoutAlign)`
  When this Canvas is included as a member in a Layout, layoutAlign controls alignment on the breadth axis of the layout.
  `Canvas`
  `setLeaveGroupLabelSpace(Boolean leaveGroupLabelSpace)`
  When showing this widget in a `group`, should any content be shifted down so that the group-label doesn't sit in front of it?
  `Canvas`
  `setLeavePageSpace(Integer leavePageSpace)`
  If set, overrides the global `defaultPageSpace`.
  `Canvas`
  `setLeft(int left)`
  Number of pixels the left side of the widget is offset to the right from its default drawing context (either its parent's topleft corner, or the document flow, depending on the value of the `position` property).
  `Canvas`
  `setLeft(String left)`
  Number of pixels the left side of the widget is offset to the right from its default drawing context (either its parent's topleft corner, or the document flow, depending on the value of the `position` property).
  `Canvas`
  `setLocateByIDOnly(boolean locateByIDOnly)`
  If `true`, when retrieving a `locator` for this component always return a reference directly to this component by `widget ID`, using the compact format `"///canvasID"`, ignoring any parent elements and ignoring any configured `testRoot`.
  `Canvas`
  `setLocateChildrenBy(LocatorStrategy locateChildrenBy)`
  Strategy to use when locating children in this canvas from an autoTest locator string.
  `Canvas`
  `setLocateChildrenType(LocatorTypeStrategy locateChildrenType)`
  `LocatorTypeStrategy` to use when finding children within this canvas.
  `Canvas`
  `setLocatePeersBy(LocatorStrategy locatePeersBy)`
  Strategy to use when locating peers of this canvas from an autoTest locator string.
  `Canvas`
  `setLocatePeersType(LocatorTypeStrategy locatePeersType)`
  `LocatorTypeStrategy` to use when finding peers of this canvas.
  `Canvas`
  `setLocatorName(String locatorName)`
  Local name for referencing this canvas from an autoTest locator string.
  `boolean`
  `setLocatorParent(Canvas locatorParent, String childName)`
  This method will set mark the target canvas as the "locator parent" for this canvas, using the specified child name.
  `boolean`
  `setLocatorParent(Canvas locatorParent, String childName, String attributeName)`
  This method will set mark the target canvas as the "locator parent" for this canvas, using the specified child name.
  `LogicalStructureObject`
  `setLogicalStructure(CanvasLogicalStructure s)`
  Setter implementing the `LogicalStructure` interface, which supports Eclipse's logical structure debugging facility.
  `Canvas`
  `setMargin(Integer margin)`
  Set the CSS Margin, in pixels, for this component.
  `Canvas`
  `setMatchElement(Boolean matchElement)`
  If `htmlElement` is specified, should this canvas be drawn at the same dimensions as the htmlElement?
  See also `matchElementWidth` and `matchElementHeight`
  `Canvas`
  `setMatchElementHeight(MatchElementSizeMode matchElementHeight)`
  For canvases with a specified `htmlElement` where `persistentMatchElement` is set to true, how should the canvas match the element's height?
  `Canvas`
  `setMatchElementWidth(MatchElementSizeMode matchElementWidth)`
  For canvases with a specified `htmlElement` where `persistentMatchElement` is set to true, how should the canvas match the element's width?
  `Canvas`
  `setMaxHeight(int maxHeight)`
  Maximum height available to this Canvas.
  `Canvas`
  `setMaxWidth(int maxWidth)`
  Maximum width available to this Canvas.
  `Canvas`
  `setMaxZoomOverflowError(int maxZoomOverflowError)`
  When `correctZoomOverflow` is true and browser or OS-level zoom is active, determines how much overflow must occur before the Framework enables scrolling for this canvas.
  `Canvas`
  `setMenuConstructor(String menuConstructor)`
  Default class used to construct menus created by this component, including context menus.
  `Canvas`
  `setMinHeight(int minHeight)`
  Minimum height available to this Canvas.
  `Canvas`
  `setMinNonEdgeSize(int minNonEdgeSize)`
  If the widget has drag resize configured on one or more of it's edges, and the edgeMarginSize is large enough that the remaining space is less than `minNonEdgeSize`, the edgeMarginSize will be reduced such that the non-edge part of the widget is at least 1/3 of the total space (with two draggable edges) or half of it (with one draggable edge).
  `Canvas`
  `setMinWidth(int minWidth)`
  Minimum width available to this Canvas.
  `Canvas`
  `setMomentumScrollMinSpeed(double momentumScrollMinSpeed)`
  The minimum speed in pixels per second that must be reached for momentum scrolling to kick in.
  `Canvas`
  `setMouseStillDownDelay(int mouseStillDownDelay)`
  Amount of time (in milliseconds) between repeated 'mouseStillDown' events for this canvas.
  `Canvas`
  `setMouseStillDownInitialDelay(int mouseStillDownInitialDelay)`
  Amount of time (in milliseconds) before mouseStillDown events start to be fired repeatedly for this canvas.
  `Canvas`
  `setName(String name)`
  Optional name for the canvas, which can later be used to reference it.
  `Canvas`
  `setNativeAutoHideScrollbars(Boolean nativeAutoHideScrollbars)`
  In some platform/browser configurations, scrollable regions do not show visible scrollbars until the user attempts to interact with the region.
  `static void`
  `setNeverUseFilters(boolean neverUseFilters)`
  Changes the system-wide `neverUseFilters` setting.
  `Canvas`
  `setNoDoubleClicks(Boolean noDoubleClicks)`
  If true, this canvas will receive all mouse-clicks as single `click` events rather than as `doubleClick` events.
  `Canvas`
  `setNoDropCursor(Cursor noDropCursor)`
  Specifies the cursor image to display when the user drags a droppable canvas over this if it is not a valid drop target for the event and `showNoDropIndicator` is true.
  `Canvas`
  `setOpacity(Integer opacity)`
  Renders the widget to be partly transparent.
  `Canvas`
  `setOverflow(Overflow overflow)`
  Controls what happens when the drawn size of the content of a Canvas is either greater or smaller than the specified size of the Canvas.
  `Canvas`
  `setPadding(Integer padding)`
  Set the CSS padding of this component, in pixels.
  `void`
  `setPageLeft(int left)`
  Set the page-relative left coordinate of this widget.
  `void`
  `setPageTop(int top)`
  Set the page-relative top coordinate of this widget.
  `void`
  `setPanelContainer(Canvas container)`
  Sets this Canvas's "panel container".
  `Canvas`
  `setParentCanvas(Canvas parentCanvas)`
  This Canvas's immediate parent, if any.
  `Canvas`
  `setParentCanvas(String parentCanvas)`
  This Canvas's immediate parent, if any.
  `Canvas`
  `setParentElement(Canvas parentElement)`
  Deprecated.
  As of Smartclient version 9.1, deprecated in favor of `parentCanvas` and `getParentCanvas()`
  `Canvas`
  `setParentElement(String parentElement)`
  Deprecated.
  As of Smartclient version 9.1, deprecated in favor of `parentCanvas` and `getParentCanvas()`
  `Canvas`
  `setPeers(Canvas... peers)`
  Array of all Canvii that are peers of this Canvas.
  `Canvas`
  `setPendingMarkerStyle(String pendingMarkerStyle)`
  CSS class used to apply additional styles to this canvas when `showPendingMarker()` is called, or when `pendingMarkerVisible` has been set.
  `Canvas`
  `setPendingMarkerVisible(Boolean pendingMarkerVisible)`
  This attribute indicates whether the `pending marker class` should be appended to the list of CSS classes applied to this canvas.
  `Canvas`
  `setPercentBox(PercentBoxModel percentBox)`
  Governs the model to be used when sizing canvases with percentage width or height, or positioning widgets with a specified `snapTo`.
  `Canvas`
  `setPercentSource(Canvas percentSource)`
  If this canvas has its size specified as a percentage, this property allows the user to explicitly designate another canvas upon which sizing will be based.
  `Canvas`
  `setPersistentMatchElement(Boolean persistentMatchElement)`
  If this canvas has a specified `htmlElement` and `matchElement` is set to true, should the canvas perform a one time resize to fit the target element on draw, or should it continue to match the target element as its size changes due to page reflows?
  `Canvas`
  `setPointerSettings(PointerSettings pointerSettings)`
  Detail settings of the `pointer` such as where it should be located along the outside of the canvas.
  `Canvas`
  `setPointerTarget(String pointerTarget)`
  This property in conjunction with the `pointerSettings.snapTo` places the canvas in relation to the target canvas.
  `Canvas`
  `setPosition(Positioning position)`
  Absolute or relative, corresponding to the "absolute" (with respect to parent) or "relative" (with respect to document flow) values for the CSS position attribute.
  `Canvas`
  `setPrefix(String prefix)`
  `Canvas`
  `setPrintChildrenAbsolutelyPositioned(Boolean printChildrenAbsolutelyPositioned)`
  Should this canvas print its children absolutely positioned when generating `printable HTML`.
  `Canvas`
  `setPrintStyleName(String printStyleName)`
  The CSS class to apply when printing this widget.
  `Canvas`
  `setPrompt(String prompt)`
  Prompt displayed in hover canvas if `showHover` is true.
  `Canvas`
  `setProportionalResizeModifiers(String... proportionalResizeModifiers)`
  If `proportionalResizing` is set to `ProportionalResizeMode.MODIFIER` or `ProportionalResizeMode.MODIFIER_OFF` then proportional resizing of the DrawItem is activated or deactivated, respectively, whenever at least one key in this set of modifier keys is pressed.
  `Canvas`
  `setProportionalResizing(ProportionalResizeMode proportionalResizing)`
  If `canDragResize` is true, this property specifies the conditions for when proportional resizing is used.
  `Canvas`
  `setReceiveScrollbarEvents(boolean receiveScrollbarEvents)`
  Whether this canvas should receive `events` from its scrollbars, which are `peers`.
  `Canvas`
  `setRect(int left, int top, int width, int height)`
  Set all four coordinates, relative to the enclosing context, at once.
  `Canvas`
  `setRect(Rectangle rectangle)`
  Set all four coordinates, relative to the enclosing context, at once.
  `Canvas`
  `setRedrawOnResize(Boolean redrawOnResize)`
  Should this element be redrawn in response to a resize?
  `void`
  `setRelativeTabPosition(Integer position)`
  Assign a relative tab position for this canvas.
  `Canvas`
  `setResizeBarTarget(String resizeBarTarget)`
  When this Canvas is included as a member in a Layout, and `showResizeBar` is set to `true` so that a resizeBar is created, `resizeBarTarget:"next"` can be set to indicate that the resizeBar should resize the next member of the layout rather than this one.
  `Canvas`
  `setResizeFrom(EdgeName... resizeFrom)`
  When drag resizing is enabled via `canDragResize`, restricts resizes to only certain edges or corners.
  `Canvas`
  `setResizeFrom(String... resizeFrom)`
  Deprecated.
  use `#setResizeFrom(EdgeName)` instead.
  `void`
  `setRight(int right)`
  Resizes the widget horizontally to position its right side at the specified coordinate.
  `Canvas`
  `setRuleScope(String ruleScope)`
  `ID` of the component that gathers the context for evaluation of criteria-based rules specified by properties such as `FormItem.visibleWhen`, Dynamic Properties, and `DynamicCriteria` such as `ListGrid.initialCriteria`.
  `Canvas`
  `setScrollbarConstructor(String scrollbarConstructor)`
  The class that will be used to create custom scrollbars for this component.
  `Canvas`
  `setScrollbarSize(int scrollbarSize)`
  How thick should we make the scrollbars for this canvas.
  `Canvas`
  `setShadowColor(String shadowColor)`
  Color for the css-based drop shadow shown if `useCSSShadow` is true and `showShadow` is true.
  `Canvas`
  `setShadowDepth(int shadowDepth)`
  Depth of the shadow, or the virtual height above the page of the widget throwing the shadow.
  `Canvas`
  `setShadowHOffset(Integer shadowHOffset)`
  Horizontal offset for the `shadow`.
  `Canvas`
  `setShadowImage(String shadowImage)`
  If `useCSSShadow` is false, (or for browsers that do not support css3), this property supplies the base name of the series of images for the sides, corners, and center of the shadow.
  `Canvas`
  `setShadowOffset(Integer shadowOffset)`
  Offset of the shadow.
  `Canvas`
  `setShadowSoftness(Integer shadowSoftness)`
  Softness, or degree of blurring, of the shadow.
  `Canvas`
  `setShadowSpread(Integer shadowSpread)`
  Explicit spread for the css-based drop shadow shown if `useCSSShadow` is true and `showShadow` is true.
  `Canvas`
  `setShadowVOffset(Integer shadowVOffset)`
  Vertical offset for the `shadow`.
  `Canvas`
  `setShouldPrint(Boolean shouldPrint)`
  Whether this canvas should be included in a printable view.
  `Canvas`
  `setShowCustomScrollbars(boolean showCustomScrollbars)`
  Whether to use the browser's native scrollbars or Smart GWT-based scrollbars.
  `Canvas`
  `setShowDragShadow(Boolean showDragShadow)`
  When this widget is dragged, if its dragAppearance is `"target"`, should we show a shadow behind the canvas during the drag.
  `Canvas`
  `setShowEdges(Boolean showEdges)`
  Whether an `EdgedCanvas` should be used to show image-based edges around this component.
  `Canvas`
  `setShowFocusOutline(boolean showFocusOutline)`
  For focusable widgets, should the native dotted focus outline be shown, where supported?
  `Canvas`
  `setShowHover(Boolean showHover)`
  If `this.canHover` is true, should we show the global hover canvas by default when the user hovers over this canvas?
  `Canvas`
  `setShowHoverComponents(Boolean showHoverComponents)`
  When set to true, shows a widget hovering at the mouse point instead of the builtin hover label.
  `Canvas`
  `setShowPointer(Boolean showPointer)`
  Should a pointer be shown? A pointer can be placed on the border to identify the target of the canvas contents.
  `Canvas`
  `setShowResizeBar(Boolean showResizeBar)`
  When this Canvas is included as a member in a `Layout`, whether a resizeBar should be shown after this member in the layout, to allow it to be resized.
  `Canvas`
  `setShowShadow(Boolean showShadow)`
  Whether to show a drop shadow for this Canvas.
  `Canvas`
  `setShowSnapGrid(Boolean showSnapGrid)`
  Whether to show a snap grid for this Canvas.
  `Canvas`
  `setShrinkElementOnHide(boolean shrinkElementOnHide)`
  This is an advanced setting.
  `Canvas`
  `setSizeMayChangeOnRedraw(Boolean sizeMayChangeOnRedraw)`
  Is it possible that a call to `redraw()` on this widget will change its size?
  `Canvas`
  `setSkinImgDir(String skinImgDir)`
  Default directory for skin images (those defined by the class), relative to the Page-wide `skinDir`.
  `Canvas`
  `setSmoothFade(Boolean smoothFade)`
  `Canvas`
  `setSnapAlignCandidates(Canvas... snapAlignCandidates)`
  When `childrenSnapAlign` is enabled, list of candidates to check for alignment.
  `Canvas`
  `setSnapAlignCenterLineStyle(String snapAlignCenterLineStyle)`
  CSS border declaration used for the line shown to indicate snapping to a center line when `childrenSnapAlign` is set.
  `Canvas`
  `setSnapAlignEdgeLineStyle(String snapAlignEdgeLineStyle)`
  CSS border declaration used for the line shown to indicate snapping to a edge line when `childrenSnapAlign` is set.
  `Canvas`
  `setSnapAxis(String snapAxis)`
  Describes which axes to apply snap-to-grid to.
  `Canvas`
  `setSnapEdge(String snapEdge)`
  If `snapTo` is defined to this widget, this property can be used to define which edge of this widget should be snapped to an edge of the master or parent element.
  `Canvas`
  `setSnapGridLineProperties(DrawLine snapGridLineProperties)`
  Specifies line styling to use when drawing the grid of lines for `SnapGridStyle`: "lines".
  `Canvas`
  `setSnapGridStyle(SnapGridStyle snapGridStyle)`
  Specifies indication style to use for snap points, either a grid of lines or an array of crosses.
  `Canvas`
  `setSnapHDirection(String snapHDirection)`
  The horizontal snap direction.
  `Canvas`
  `setSnapHGap(int snapHGap)`
  The horizontal grid size to use, in pixels, when snap-to-grid is enabled.
  `Canvas`
  `setSnapOffsetLeft(Integer snapOffsetLeft)`
  If `snapTo` is defined for this widget, this property can be used to specify an offset in px or percentage for the left coordinate of this widget.
  `Canvas`
  `setSnapOffsetTop(Integer snapOffsetTop)`
  If `snapTo` is defined for this widget, this property can be used to specify an offset in px or percentage for the top coordinate of this widget.
  `Canvas`
  `setSnapOnDrop(Boolean snapOnDrop)`
  When this canvas is dropped onto an object supporting snap-to-grid, should it snap to the grid (true, the default) or just drop wherever the mouse is (false).
  `Canvas`
  `setSnapResizeToAlign(Boolean snapResizeToAlign)`
  Flag to disable snapping to alignment when this Canvas is resized.
  `Canvas`
  `setSnapResizeToGrid(Boolean snapResizeToGrid)`
  Causes this canvas to snap to its parent's grid when resizing.
  `Canvas`
  `setSnapTo(String snapTo)`
  Position this widget such that it is aligned with ("snapped to") an edge of its `master` (if specified), or its `parent canvas`.
  `Canvas`
  `setSnapToAlign(Boolean snapToAlign)`
  Flag to disable snapping to alignment when this Canvas is dragged when `childrenSnapAlign` is enabled on this Canvas' parent.
  `Canvas`
  `setSnapToCenterAlign(Boolean snapToCenterAlign)`
  Flag to disable snapping to center alignment when this Canvas is dragged when `childrenSnapAlign` is enabled on this Canvas' parent.
  `Canvas`
  `setSnapToEdgeAlign(Boolean snapToEdgeAlign)`
  Flag to disable snapping to edge alignment when this Canvas is dragged when `childrenSnapAlign` is enabled on this Canvas' parent.
  `Canvas`
  `setSnapToGrid(Boolean snapToGrid)`
  Causes this canvas to snap to its parent's grid when dragging.
  `Canvas`
  `setSnapVDirection(String snapVDirection)`
  The vertical snap direction.
  `Canvas`
  `setSnapVGap(int snapVGap)`
  The vertical grid size to use, in pixels, when snap-to-grid is enabled.
  `Canvas`
  `setStartLine(Boolean startLine)`
  Whether this canvas should always start a new line when used as a tile in a `FlowLayout`.
  `void`
  `setStyleName(String styleName)`
  The CSS class applied to this widget as a whole.
  `Canvas`
  `setTabIndex(Integer tabIndex)`
  If specified this governs the tabIndex of the widget in the page's tab order.
  `Canvas`
  `setTestDataContext(DataContext testDataContext)`
  A `DataContext` to be used if no `dataContext` is provided (directly or indirectly via a parent).
  `void`
  `setTitle(String title)`
  Synonym for `setPrompt(String)`
  `Canvas`
  `setTooltip(String tooltip)`
  Synonym for `setPrompt(String)`
  `Canvas`
  `setTop(int top)`
  Number of pixels the top of the widget is offset down from its default drawing context (either its parent's top-left corner, or the document flow, depending on the value of the `position` property).
  `Canvas`
  `setTop(String top)`
  Number of pixels the top of the widget is offset down from its default drawing context (either its parent's top-left corner, or the document flow, depending on the value of the `position` property).
  `Canvas`
  `setUpdateTabPositionOnDraw(boolean updateTabPositionOnDraw)`
  Should canvases with no `parent canvas` be moved to the end of the TabIndexManager tree on draw()?
  `Canvas`
  `setUpdateTabPositionOnReparent(boolean updateTabPositionOnReparent)`
  Should canvases with a `parent canvas` be added to the TabIndexManager under the parent as described in `updateChildTabPositions()` and `updateChildTabPosition()`?
  `Canvas`
  `setUseBackMask(Boolean useBackMask)`
  In earlier versions of Internet Explorer (pre IE9), a native limitation exists whereby if HTML elements are overlapping on the page, certain elements can appear to "burn through" elements in the same position with a higher z-index.
  `Canvas`
  `setUseCSSShadow(boolean useCSSShadow)`
  If `showShadow` is true, should we use the css `box-shadow` property (where supported) to achieve the shadow?
  `Canvas`
  `setUseDragMask(boolean useDragMask)`
  This flag controls whether we register the component as a maskable item with the EventHandler.
  `Canvas`
  `setUseImageForSVG(boolean useImageForSVG)`
  If set, forces the main SVG image or icon in the canvas to be rendered in an image tag rather than an object tag, the default.
  `Canvas`
  `setUseNativeDrag(Boolean useNativeDrag)`
  If set, native HTML5 drag and drop will be used for all drags initiated on this widget (on browsers where this is supported), and native HTML5 drop events occurring over this widget will be processed.
  `Canvas`
  `setUseOpacityFilter(Boolean useOpacityFilter)`
  Configures where the Opacity filter is used for IE6-8.
  `Canvas`
  `setUseTouchScrolling(Boolean useTouchScrolling)`
  On `touch devices`, if this `Canvas` can be scrolled, should touch-dragging the content area result in scrolling? Set to `false` if touch-dragging should not cause scrolling.
  `Canvas`
  `setValuesManager(ValuesManager valuesManager)`
  `ValuesManager` for managing values displayed in this component.
  `Canvas`
  `setValuesManager(String valuesManager)`
  `ValuesManager` for managing values displayed in this component.
  `Canvas`
  `setVisibility(Visibility visibility)`
  Controls widget visibility when the widget is initialized.
  `void`
  `setVisible(boolean visible)`
  `Canvas`
  `setVisibleWhen(AdvancedCriteria visibleWhen)`
  Criteria to be evaluated to determine whether this Canvas should be visible.
  `Canvas`
  `setWidth(int width)`
  `Canvas`
  `setWidth(Integer width)`
  The `canvas.width` attribute specifies the size for a component's horizontal dimension; `canvas.height` specifies the size for the vertical dimension.
  `void`
  `setWidth(String width)`
  The `canvas.width` attribute specifies the size for a component's horizontal dimension; `canvas.height` specifies the size for the vertical dimension.
  `Canvas`
  `setWidth100()`
  Convenience method that sets the width to 100%.
  `Canvas`
  `setWorkflows(Process... workflows)`
  List of screen-global `workflows` that can be shared by event handler workflows using a `StartProcessTask`.
  `Canvas`
  `setZIndex(int newIndex)`
  Set the z-Index of the canvas.
  `void`
  `shouldDragScroll()`
  If this widget is showing scrollbars, and a user drags close to the edge of the viewport, should we scroll the viewport in the appropriate direction? Returns this.canDragScroll if there are scrollbars, else false.
  `void`
  `show()`
  Sets this widget's visibility to "inherit", so that it becomes visible if all of its parents are visible or it has no parents.
  `String`
  `showClickMask(Function clickActionCallback, ClickMaskMode mode, Canvas[] unmaskedTargets)`
  Show a clickMask over the entire screen that intercepts mouse clicks and fires some action.
  `void`
  `showComponentMask()`
  Temporariy block all user interaction with children of this widget, with the exception of those passed in in the `unmaskedChildren` parameter.
  `void`
  `showComponentMask(Canvas... unmaskedChildren)`
  Temporariy block all user interaction with children of this widget, with the exception of those passed in in the `unmaskedChildren` parameter.
  `void`
  `showNextTo(Canvas otherWidget)`
  Show this widget next to another widget on the page, positioned such that it will not extend beyond the browser viewport.
  `void`
  `showNextTo(Canvas otherWidget, String side)`
  See `showNextTo()`
  `void`
  `showNextTo(Canvas otherWidget, String side, boolean canOcclude)`
  See `showNextTo()`
  `void`
  `showNextTo(Canvas otherWidget, String side, boolean canOcclude, boolean skipAnimation)`
  Show this widget next to another widget on the page, positioned such that it will not extend beyond the browser viewport.
  `void`
  `showPendingMarker()`
  Manually move this component into the "pending changes" visual state (based on the `pendingMarker style`, or the Pending suffix in stateful components).
  `static void`
  `showPrintPreview(Canvas component)`
  Show a PrintWindow containing a printable view of the component passed in containing print HTML.
  `static void`
  `showPrintPreview(Object[] components)`
  Show a Print containing a printable view of the components passed in.
  `static void`
  `showPrintPreview(Object[] components, PrintProperties printProperties, String title, PrintPreviewCallback callback)`
  Show a Print containing a printable view of the components passed in.
  `static void`
  `showPrintPreview(Object[] components, PrintProperties printProperties, String title, PrintPreviewCallback callback, Window printWindowProperties, String printButtonTitle)`
  Show a Print containing a printable view of the components passed in.
  `void`
  `showRecursively()`
  Recursively show the canvas and all its parents so the canvas will be visible.
  `static void`
  `startDebuggingOverflow(DebugOverflowSettings settings)`
  Start to track and report excessive overflow per the supplied settings.
  `static void`
  `stopDebuggingOverflow()`
  Stop tracking and reporting excessive overflow.
  `Boolean`
  `supportsValueDictation()`
  If this method returns true and VoiceAssist has been activated by triple-tapping the Control key, the user may dictate a new value for this Canvas by double-tapping Control to start recording.
  `Boolean`
  `supportsVoiceCommands()`
  If this method returns true and VoiceAssist has been activated by triple-tapping the Control key, the user may dictate a command to this Canvas.
  `void`
  `updateChildTabPosition(Canvas child)`
  Ensure that a specific child is slotted correctly into the page's tab order.
  `void`
  `updateChildTabPositions()`
  Update the childrens' tab positions, slotting them under this widget in the `TabIndexManager`, in the order defined by `getChildTabPosition()`.
  `void`
  `updateEditNode(EditContext editContext, EditNode editNode)`
  A callback invoked for each `liveObject` by `EditContext` when the EditContext is being serialized.
  `void`
  `updateHover()`
  If this canvas is currently showing a hover (see `handleHover()`), this method can be called to update the HTML contents of the hover.
  `void`
  `updateHover(String hoverHTML)`
  If this canvas is currently showing a hover (see `handleHover()`), this method can be called to update the HTML contents of the hover.
  `void`
  `updateShadow()`
  Update the canvas shadow.
  `void`
  `updateTabPositionForDraw()`
  This method is executed on draw.
  `Boolean`
  `visibleAtPoint(int x, int y, boolean withinViewport, Canvas ignoreWidgets, Canvas upToParent)`
  Does this widget contain the specified global (x,y) coordinates, and have no other widgets also at the specified position, obscuring this one? This is commonly used for (for example) drag and drop interactions.
  `Boolean`
  `willAcceptDrop()`
  Returns true if the widget object being dragged can be dropped on this widget, and false or null otherwise.

  ### Methods inherited from class com.smartgwt.client.widgets.BaseWidget

  `addDrawHandler, addDynamicProperty, addDynamicProperty, addDynamicProperty, addDynamicProperty, applyFactoryProperties, clearDynamicProperty, completeCreation, destroy, doAddHandler, doInit, doOnRender, draw, equals, error, errorIfNotCreated, getAttribute, getAttributeAsBoolean, getAttributeAsDate, getAttributeAsDateArray, getAttributeAsDouble, getAttributeAsElement, getAttributeAsFloat, getAttributeAsFloatArray, getAttributeAsInt, getAttributeAsIntArray, getAttributeAsJavaScriptObject, getAttributeAsMap, getAttributeAsObject, getAttributeAsRecord, getAttributeAsString, getAttributeAsStringArray, getAutoDraw, getConfig, getDOM, getHandlerCount, getID, getInnerHTML, getJsObj, getOrCreateJsObj, getRef, getScClassName, hasAutoAssignedID, hasDynamicProperty, hashCode, initNativeObject, internalSetID, internalSetID, isConfigOnly, isCreated, isDrawn, isFactoryCreated, onBind, onDestroy, onDraw, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAutoDraw, setConfig, setConfigOnly, setDefaultProperties, setDragTracker, setFactoryCreated, setID, setJavaScriptObject, setLogicalStructure, setLogicalStructure, setNullProperty, setPosition, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setProperty, setScClassName, toString`

  ### Methods inherited from class com.google.gwt.user.client.ui.Widget

  `addAttachHandler, addBitlessDomHandler, addDomHandler, addHandler, asWidget, asWidgetOrNull, createHandlerManager, delegateEvent, doAttachChildren, doDetachChildren, fireEvent, getLayoutData, getParent, isAttached, isOrWasAttached, onBrowserEvent, onLoad, onUnload, removeFromParent, setLayoutData, sinkEvents, unsinkEvents`

  ### Methods inherited from class com.google.gwt.user.client.ui.UIObject

  `addStyleDependentName, ensureDebugId, ensureDebugId, ensureDebugId, getStyleElement, getStyleName, getStylePrimaryName, getStylePrimaryName, isVisible, onEnsureDebugId, removeStyleDependentName, removeStyleName, resolvePotentialElement, setElement, setPixelSize, setSize, setStyleDependentName, setStyleName, setStyleName, setStyleName, setStylePrimaryName, setStylePrimaryName, setVisible, sinkBitlessEvent`

  ### Methods inherited from class java.lang.Object

  `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

  ### Methods inherited from interface com.google.gwt.event.shared.HasHandlers

  `fireEvent`

- ## Constructor Details

  - ### Canvas

    public Canvas()

  - ### Canvas

    public Canvas(JavaScriptObject jsObj)

  - ### Canvas

    public Canvas(String id)

- ## Method Details

  - ### getOrCreateRef

    public static Canvas getOrCreateRef(JavaScriptObject jsObj)

  - ### getPaletteDefaults

    public Map getPaletteDefaults()
    This method returns a Map of config properties suitable for use as the "defaults" attribute of a `PaletteNode`. Use it when you need to work with PaletteNodes indirectly, such when setting up `TileRecord`s that will be used in a `TilePalette`. See `the dev tools overview` for examples of how to assemble and acquire a suitable defaults object when you are creating a PaletteNode indirectly

  - ### changeAutoChildDefaults

    public static void changeAutoChildDefaults(String autoChildName, Canvas defaults)
    Changes the defaults for Canvas AutoChildren named `autoChildName`.
    Parameters:
      `autoChildName` - name of an AutoChild to customize the defaults for.
      `defaults` - Canvas defaults to apply. These defaults override any existing properties without destroying or wiping out non-overridden properties. For usage tips on this param, see `SGWTProperties`.
    See Also:
      - `AutoChildUsage`

  - ### changeAutoChildDefaults

    public static void changeAutoChildDefaults(String autoChildName, FormItem defaults)
    Changes the defaults for FormItem AutoChildren named `autoChildName`.
    Parameters:
      `autoChildName` - name of an AutoChild to customize the defaults for.
      `defaults` - FormItem defaults to apply. These defaults override any existing properties without destroying or wiping out non-overridden properties. For usage tips on this param, see `SGWTProperties`.
    See Also:
      - `AutoChildUsage`

  - ### create

    protected JavaScriptObject create()
    Overrides:
      `create` in class `BaseWidget`

  - ### setAccessKey

    public Canvas setAccessKey(String accessKey)
    If specified this governs the HTML accessKey for the widget.

    This should be set to a character - when a user hits the html accessKey modifier for the browser, plus this character, focus will be given to the widget in question. The accessKey modifier can vary by browser and platform.

    The following list of default behavior is for reference only, developers should also consult browser documentation for additional information.

    - Internet Explorer (all platforms): `Alt` + accessKey
    - Mozilla Firefox (Windows, Unix): `Alt+Shift` + accessKey
    - Mozilla Firefox (Mac): `Ctrl+Opt` + accessKey
    - Chrome and Safari (Windows, Unix): `Alt` + accessKey
    - Chrome and Safari (Mac): `Ctrl+Opt` + accessKey
    If this method is called after the component has been drawn/initialized: Set the accessKey for this canvas.

    The accessKey can be set to any alphanumeric character (symbols not supported) Having set an accessKey, the canvas will be given focus when the user hits Alt+[accessKey], or in Mozilla Firefox 2.0 and above, Shift+Alt+[accessKey].

    Note : This is an advanced setting

    Parameters:
      `accessKey` - Character to use as an accessKey for this widget. Case Insensitive. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Focus`

  - ### getAccessKey

    public String getAccessKey()
    If specified this governs the HTML accessKey for the widget.

    This should be set to a character - when a user hits the html accessKey modifier for the browser, plus this character, focus will be given to the widget in question. The accessKey modifier can vary by browser and platform.

    The following list of default behavior is for reference only, developers should also consult browser documentation for additional information.

    - Internet Explorer (all platforms): `Alt` + accessKey
    - Mozilla Firefox (Windows, Unix): `Alt+Shift` + accessKey
    - Mozilla Firefox (Mac): `Ctrl+Opt` + accessKey
    - Chrome and Safari (Windows, Unix): `Alt` + accessKey
    - Chrome and Safari (Mac): `Ctrl+Opt` + accessKey
    Returns:
      Current accessKey value. Default value is null
    See Also:
      - `Focus`

  - ### setAdaptiveHeightPriority

    public Canvas setAdaptiveHeightPriority(Integer adaptiveHeightPriority) throws IllegalStateException
    See `adaptiveWidthPriority`.
    Parameters:
      `adaptiveHeightPriority` - New adaptiveHeightPriority value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getAdaptiveHeightPriority

    public Integer getAdaptiveHeightPriority()
    See `adaptiveWidthPriority`.
    Returns:
      Current adaptiveHeightPriority value. Default value is null

  - ### setAdaptiveWidthPriority

    public Canvas setAdaptiveWidthPriority(Integer adaptiveWidthPriority) throws IllegalStateException
    If multiple widgets in the same Layout have `adaptive width`, `adaptiveWidthPriority` can be set to indicate which of the components should be given priority access to space.

    The widget with the highest priority setting will be offered surplus space first, and asked to give up space last. Lack of a priority setting is treated as zero. Any adaptive widgets with the same priority setting will be asked to give up or release space according to their order in `Layout.members`.

    Parameters:
      `adaptiveWidthPriority` - New adaptiveWidthPriority value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `setCanAdaptWidth(java.lang.Boolean)`

  - ### getAdaptiveWidthPriority

    public Integer getAdaptiveWidthPriority()
    If multiple widgets in the same Layout have `adaptive width`, `adaptiveWidthPriority` can be set to indicate which of the components should be given priority access to space.

    The widget with the highest priority setting will be offered surplus space first, and asked to give up space last. Lack of a priority setting is treated as zero. Any adaptive widgets with the same priority setting will be asked to give up or release space according to their order in `Layout.members`.

    Returns:
      Current adaptiveWidthPriority value. Default value is null
    See Also:
      - `getCanAdaptWidth()`

  - ### setAlwaysManageFocusNavigation

    public Canvas setAlwaysManageFocusNavigation(Boolean alwaysManageFocusNavigation) throws IllegalStateException
    Should focus navigation for this canvas and its descendents be handled explicitly by intercepting "Tab" key events and calling the `TabIndexManager.shiftFocus()` API?

    Setting this property to `true` will cause the registered TabIndexManager entry for this canvas to be marked as `useExplicitFocusNavigation:true`, and will cause standard event handling for the canvas and its descendents to intercept Tab keystrokes and explicitly call `TabIndexManager.shiftFocus()` rather than relying on native browser Tab navigation

    Parameters:
      `alwaysManageFocusNavigation` - New alwaysManageFocusNavigation value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getAlwaysManageFocusNavigation

    public Boolean getAlwaysManageFocusNavigation()
    Should focus navigation for this canvas and its descendents be handled explicitly by intercepting "Tab" key events and calling the `TabIndexManager.shiftFocus()` API?

    Setting this property to `true` will cause the registered TabIndexManager entry for this canvas to be marked as `useExplicitFocusNavigation:true`, and will cause standard event handling for the canvas and its descendents to intercept Tab keystrokes and explicitly call `TabIndexManager.shiftFocus()` rather than relying on native browser Tab navigation

    Returns:
      Current alwaysManageFocusNavigation value. Default value is null

  - ### setAlwaysShowScrollbars

    public Canvas setAlwaysShowScrollbars(Boolean alwaysShowScrollbars) throws IllegalStateException
    Should this browser always show custom scrollbars if `showCustomScrollbars` is true?

    On `touch devices` that support native touch scrolling, if `showCustomScrollbars` is `true` and touch scrolling has not been disabled by the `useTouchScrolling` and/or `disableTouchScrollingForDrag` settings, should custom scrollbars and native touch scrolling be enabled for this component? If `false` or unset, then only native touch scrolling will be enabled. If `true`, then both scrolling mechanisms will be enabled.

    NOTE: Because native touch scrolling (also called momentum scrolling) is computationally intensive, some mobile browsers implement an optimization where the state of the DOM for the element being scrolled will be frozen or partially frozen during the scroll animation. This results in a delay between when the scroll position reaches a certain point in the animation and when the positions of the custom scrollbar thumbs are updated to reflect that scroll position.

    For non-touch devices, setting this property to `true` will override `nativeAutoHideScrollbars`, and ensure custom scrollbars are shown for the component

    Note : This is an advanced setting

    Parameters:
      `alwaysShowScrollbars` - New alwaysShowScrollbars value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Scrolling overview and related methods`

  - ### getAlwaysShowScrollbars

    public Boolean getAlwaysShowScrollbars()
    Should this browser always show custom scrollbars if `showCustomScrollbars` is true?

    On `touch devices` that support native touch scrolling, if `showCustomScrollbars` is `true` and touch scrolling has not been disabled by the `useTouchScrolling` and/or `disableTouchScrollingForDrag` settings, should custom scrollbars and native touch scrolling be enabled for this component? If `false` or unset, then only native touch scrolling will be enabled. If `true`, then both scrolling mechanisms will be enabled.

    NOTE: Because native touch scrolling (also called momentum scrolling) is computationally intensive, some mobile browsers implement an optimization where the state of the DOM for the element being scrolled will be frozen or partially frozen during the scroll animation. This results in a delay between when the scroll position reaches a certain point in the animation and when the positions of the custom scrollbar thumbs are updated to reflect that scroll position.

    For non-touch devices, setting this property to `true` will override `nativeAutoHideScrollbars`, and ensure custom scrollbars are shown for the component

    Returns:
      Current alwaysShowScrollbars value. Default value is null
    See Also:
      - `Scrolling overview and related methods`

  - ### setAnimateAcceleration

    public Canvas setAnimateAcceleration(AnimationAcceleration animateAcceleration)
    Default acceleration effect to apply to all animations on this Canvas. Can be overridden by setting animationAcceleration for specific animations or by passing an acceleration function directly into the appropriate method.

    Note : This is an advanced setting

    Parameters:
      `animateAcceleration` - New animateAcceleration value. Default value is "smoothEnd"
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateAcceleration

    public AnimationAcceleration getAnimateAcceleration()
    Default acceleration effect to apply to all animations on this Canvas. Can be overridden by setting animationAcceleration for specific animations or by passing an acceleration function directly into the appropriate method.
    Returns:
      Current animateAcceleration value. Default value is "smoothEnd"

  - ### setAnimateFadeTime

    public Canvas setAnimateFadeTime(Integer animateFadeTime)
    Default time for performing an animated fade. If unset, `this.animateTime` will be used by default instead

    Note : This is an advanced setting

    Parameters:
      `animateFadeTime` - New animateFadeTime value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateFadeTime

    public Integer getAnimateFadeTime()
    Default time for performing an animated fade. If unset, `this.animateTime` will be used by default instead
    Returns:
      Current animateFadeTime value. Default value is null

  - ### setAnimateHideAcceleration

    public Canvas setAnimateHideAcceleration(AnimationAcceleration animateHideAcceleration)
    Default acceleration function for performing an animated hide. If unset, `this.animateAcceleration` will be used by default instead

    Note : This is an advanced setting

    Parameters:
      `animateHideAcceleration` - New animateHideAcceleration value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateHideAcceleration

    public AnimationAcceleration getAnimateHideAcceleration()
    Default acceleration function for performing an animated hide. If unset, `this.animateAcceleration` will be used by default instead
    Returns:
      Current animateHideAcceleration value. Default value is null

  - ### setAnimateHideTime

    public Canvas setAnimateHideTime(Integer animateHideTime)
    Default time for performing an animated hide. If unset, `this.animateTime` will be used by default instead

    Note : This is an advanced setting

    Parameters:
      `animateHideTime` - New animateHideTime value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateHideTime

    public Integer getAnimateHideTime()
    Default time for performing an animated hide. If unset, `this.animateTime` will be used by default instead
    Returns:
      Current animateHideTime value. Default value is null

  - ### setAnimateMoveAcceleration

    public Canvas setAnimateMoveAcceleration(AnimationAcceleration animateMoveAcceleration)
    Default acceleration effect for performing an animated move. If unset, `this.animateAcceleration` will be used by default instead

    Note : This is an advanced setting

    Parameters:
      `animateMoveAcceleration` - New animateMoveAcceleration value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateMoveAcceleration

    public AnimationAcceleration getAnimateMoveAcceleration()
    Default acceleration effect for performing an animated move. If unset, `this.animateAcceleration` will be used by default instead
    Returns:
      Current animateMoveAcceleration value. Default value is null

  - ### setAnimateMoveTime

    public Canvas setAnimateMoveTime(Integer animateMoveTime)
    Default time for performing an animated move. If unset, `this.animateTime` will be used by default instead

    Note : This is an advanced setting

    Parameters:
      `animateMoveTime` - New animateMoveTime value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateMoveTime

    public Integer getAnimateMoveTime()
    Default time for performing an animated move. If unset, `this.animateTime` will be used by default instead
    Returns:
      Current animateMoveTime value. Default value is null

  - ### setAnimateRectAcceleration

    public Canvas setAnimateRectAcceleration(AnimationAcceleration animateRectAcceleration)
    Default acceleration function for performing an animated move and resize. If unset, `this.animateAcceleration` will be used by default instead

    Note : This is an advanced setting

    Parameters:
      `animateRectAcceleration` - New animateRectAcceleration value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateRectAcceleration

    public AnimationAcceleration getAnimateRectAcceleration()
    Default acceleration function for performing an animated move and resize. If unset, `this.animateAcceleration` will be used by default instead
    Returns:
      Current animateRectAcceleration value. Default value is null

  - ### setAnimateRectTime

    public Canvas setAnimateRectTime(Integer animateRectTime)
    Default time for performing an animated setRect. If unset, `this.animateTime` will be used by default instead

    Note : This is an advanced setting

    Parameters:
      `animateRectTime` - New animateRectTime value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateRectTime

    public Integer getAnimateRectTime()
    Default time for performing an animated setRect. If unset, `this.animateTime` will be used by default instead
    Returns:
      Current animateRectTime value. Default value is null

  - ### setAnimateResizeAcceleration

    public Canvas setAnimateResizeAcceleration(AnimationAcceleration animateResizeAcceleration)
    Default acceleration function for performing an animated resize. If unset, `this.animateAcceleration` will be used by default instead

    Note : This is an advanced setting

    Parameters:
      `animateResizeAcceleration` - New animateResizeAcceleration value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateResizeAcceleration

    public AnimationAcceleration getAnimateResizeAcceleration()
    Default acceleration function for performing an animated resize. If unset, `this.animateAcceleration` will be used by default instead
    Returns:
      Current animateResizeAcceleration value. Default value is null

  - ### setAnimateResizeLayoutMode

    public Canvas setAnimateResizeLayoutMode(AnimationLayoutMode animateResizeLayoutMode)
    When to update the `child layout` for a `size animation`. Updating the child layout more often may improve appearance, but risks prohibitive overhead with more complicated widget hierarchies.

    Note : This is an advanced setting

    Parameters:
      `animateResizeLayoutMode` - New animateResizeLayoutMode value. Default value is "atEnd"
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateResizeLayoutMode

    public AnimationLayoutMode getAnimateResizeLayoutMode()
    When to update the `child layout` for a `size animation`. Updating the child layout more often may improve appearance, but risks prohibitive overhead with more complicated widget hierarchies.
    Returns:
      Current animateResizeLayoutMode value. Default value is "atEnd"

  - ### setAnimateResizeTime

    public Canvas setAnimateResizeTime(Integer animateResizeTime)
    Default time for performing an animated resize. If unset, `this.animateTime` will be used by default instead

    Note : This is an advanced setting

    Parameters:
      `animateResizeTime` - New animateResizeTime value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateResizeTime

    public Integer getAnimateResizeTime()
    Default time for performing an animated resize. If unset, `this.animateTime` will be used by default instead
    Returns:
      Current animateResizeTime value. Default value is null

  - ### setAnimateScrollAcceleration

    public Canvas setAnimateScrollAcceleration(AnimationAcceleration animateScrollAcceleration)
    Default acceleration function for performing an animated scroll. If unset, `this.animateAcceleration` will be used by default instead

    Note : This is an advanced setting

    Parameters:
      `animateScrollAcceleration` - New animateScrollAcceleration value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateScrollAcceleration

    public AnimationAcceleration getAnimateScrollAcceleration()
    Default acceleration function for performing an animated scroll. If unset, `this.animateAcceleration` will be used by default instead
    Returns:
      Current animateScrollAcceleration value. Default value is null

  - ### setAnimateScrollTime

    public Canvas setAnimateScrollTime(Integer animateScrollTime)
    Default time for performing an animated scroll. If unset, `this.animateTime` will be used by default instead

    Note : This is an advanced setting

    Parameters:
      `animateScrollTime` - New animateScrollTime value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateScrollTime

    public Integer getAnimateScrollTime()
    Default time for performing an animated scroll. If unset, `this.animateTime` will be used by default instead
    Returns:
      Current animateScrollTime value. Default value is null

  - ### setAnimateShowAcceleration

    public Canvas setAnimateShowAcceleration(AnimationAcceleration animateShowAcceleration)
    Default acceleration function for performing an animated show. If unset, `this.animateAcceleration` will be used by default instead

    Note : This is an advanced setting

    Parameters:
      `animateShowAcceleration` - New animateShowAcceleration value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateShowAcceleration

    public AnimationAcceleration getAnimateShowAcceleration()
    Default acceleration function for performing an animated show. If unset, `this.animateAcceleration` will be used by default instead
    Returns:
      Current animateShowAcceleration value. Default value is null

  - ### setAnimateShowTime

    public Canvas setAnimateShowTime(Integer animateShowTime)
    Default time for performing an animated show. If unset, `this.animateTime` will be used by default instead

    Note : This is an advanced setting

    Parameters:
      `animateShowTime` - New animateShowTime value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateShowTime

    public Integer getAnimateShowTime()
    Default time for performing an animated show. If unset, `this.animateTime` will be used by default instead
    Returns:
      Current animateShowTime value. Default value is null

  - ### setAnimateTime

    public Canvas setAnimateTime(int animateTime)
    Default total duration of animations. Can be overridden by setting animation times for specific animations, or by passing a `duration` parameter into the appropriate animate...() method.

    Note : This is an advanced setting

    Parameters:
      `animateTime` - New animateTime value. Default value is 300
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - Fly Onscreen Example

  - ### getAnimateTime

    public int getAnimateTime()
    Default total duration of animations. Can be overridden by setting animation times for specific animations, or by passing a `duration` parameter into the appropriate animate...() method.
    Returns:
      Current animateTime value. Default value is 300
    See Also:
      - Fly Onscreen Example

  - ### setAppImgDir

    public Canvas setAppImgDir(String appImgDir)
    Default directory for app-specific images, relative to the Page-wide `appImgDir`.

    Note : This is an advanced setting

    Parameters:
      `appImgDir` - New appImgDir value. Default value is ""
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `URL`
      - `Images overview and related methods`

  - ### getAppImgDir

    public String getAppImgDir()
    Default directory for app-specific images, relative to the Page-wide `appImgDir`.
    Returns:
      Current appImgDir value. Default value is ""
    See Also:
      - `URL`
      - `Images overview and related methods`

  - ### setAriaRole

    public Canvas setAriaRole(String ariaRole) throws IllegalStateException
    ARIA role of this component. Usually does not need to be manually set - see `Accessibility`.
    Parameters:
      `ariaRole` - New ariaRole value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Accessibility / Section 508 compliance`

  - ### getAriaRole

    public String getAriaRole()
    ARIA role of this component. Usually does not need to be manually set - see `Accessibility`.
    Returns:
      Current ariaRole value. Default value is null
    See Also:
      - `Accessibility / Section 508 compliance`

  - ### setAutoMaskComponents

    public Canvas setAutoMaskComponents(Boolean autoMaskComponents) throws IllegalStateException
    Deprecated.
    As of Smart GWT version 10.0, deprecated in favor of `EditProxy.autoMaskChildren`
    When nodes are added to an EditContext, should they be masked by setting `EditProxy.useEditMask` `true` if not explicitly set?
    Parameters:
      `autoMaskComponents` - New autoMaskComponents value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getAutoMaskComponents

    public Boolean getAutoMaskComponents()
    Deprecated.
    As of Smart GWT version 10.0, deprecated in favor of `EditProxy.autoMaskChildren`
    When nodes are added to an EditContext, should they be masked by setting `EditProxy.useEditMask` `true` if not explicitly set?
    Returns:
      Current autoMaskComponents value. Default value is null

  - ### setAutoParent

    public Canvas setAutoParent(String autoParent) throws IllegalStateException
    This initialization property allows developers to create a canvas using the Class.addAutoChild() method, and have it added as a child to some other component. This property may be set to the `childName` of another already-created auto-child, or `"none"` to cause the component to be created without being added as a child to any other widget.
    If unset, the canvas will be added as a child to the component on which `addAutoChild(...)` was called.

    See `autoChildren` for an overview of the autoChild subsystem.

    Note : This is an advanced setting

    Parameters:
      `autoParent` - New autoParent value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getAutoParent

    public String getAutoParent()
    This initialization property allows developers to create a canvas using the Class.addAutoChild() method, and have it added as a child to some other component. This property may be set to the `childName` of another already-created auto-child, or `"none"` to cause the component to be created without being added as a child to any other widget.
    If unset, the canvas will be added as a child to the component on which `addAutoChild(...)` was called.

    See `autoChildren` for an overview of the autoChild subsystem.

    Returns:
      Current autoParent value. Default value is null

  - ### setAutoPopulateData

    public Canvas setAutoPopulateData(Boolean autoPopulateData) throws IllegalStateException
    If a `dataContext` is provided, should subcomponents automatically bind to the data?

    In general, if you provide a `primaryKey` value for a record, that specific record will be shown or edited, or have its related records loaded. If you provide other field values without the primaryKey value, those values will be treated as either criteria (for a grid) or as initial values (for a form).

    Components will respond to `dataContext` differently depending on whether they typically work with just a single record (such as `form` or a `DetailViewer`), or whether they usually work with lists of records (such as `ListGrid` or `TileGrid`, which have `component.dataArity` set to `multipe` by default).

    Specifically, the following rules are used:

    1. for a singular component (eg forms, detailViewers):
       - if only the PK (primary key) value is provided, the component will fetch the singular record and display or edit it
       - if the PK is provided along with other values, the component will assume it has a complete record, and display or edit it
       - if only non-PK values are provided, the component will assume these are initial values
    2. for a multiple component (eg listGrid, tileGrid):
       - if only non-PK values are provided, the component will use these as criteria. For example, a grid bound to an Orders DataSource with `dataContext` of Status:"In Process" would fetch records with that status
       - if the PK is provided, and the component's DataSource is related to one of the DataSources in the `dataContext`, related records will be fetched, using the PK value (similarly to if `fetchRelatedData()` had been called. For example, if an orderNumber value was provided, a grid bound to OrderDetail would fetch line items for that orderNumber.
       - if an array of multiple records is provided, that data is used as if setData() had been called on the component
    If any of these behaviors is not desired, you can just set `autoPopulateData` to false on the specific component that should not be auto-populated.

    Specific examples, using the Order and OrderDetail sample DataSources, where OrderDetail records are associated (many-to-1) with Order records, and the PK of Order is orderNumber:

    1. a form or DetailViewer bound to Order and a ListGrid bound to OrderDetail:
       - if an orderNumber is provided, the form or DetailViewer would show that order, and the grid would show related OrderDetail records
       - if only orderNumber is provided (no additional fields), the full Order record is automatically fetched for the form or DetailViewer

       This fulfills a common use case of viewing or editing an Order and its related OrderDetail records.

    2. a grid bound to Order and a second grid bound to OrderDetail
       - if values such as orderStatus : "On Hold" were provided, the Order grid uses those as criteria
       - the OrderDetail grid does nothing

       This fulfills a common use case of viewing Order records that match certain criteria. The OrderDetail grid would generally be populated only by an event handler installed on the Order grid, which would call `fetchRelatedData`.

    3. a grid and form both bound to Order
       - if values such as orderStatus : "On Hold" were provided, the Order grid uses those as criteria, and the form uses those as initial values

       This fulfills two possible use cases:

       - the form is a SearchForm for searching the grid, so it should show the same criteria as are applied to the grid
       - the form is for editing the selected record in the grid, or adding new ones. It is ready to either add a new record, or for the user to select a record to show in the form, typically via logic added to the grid (e.g. `recordClick` -> `form.editSelectedData()`.

    By default, `autoPopulateData` is true for any component that is contained with a "screen" `RPCManager.createScreen()` and false for any component that is an `com.smartgwt.client.types.AutoChild`.

    Note that, if there is a non-DBC in your screen that wants to access fields in the expected dataContext, the DynamicProperty can refer to properties that auto-populated DBCs will place into the ruleContext. For example, with a DynamicForm "itemEditor" bound to "supplyItem", a header above could use itemEditor.values.itemName to display the name of the item. The header will then show the expected value as soon as the DynamicForm is auto-populated.

    Similarly, the `DataView.drawn()` StringMethod fires after auto-population has occurred, so any startup actions in a screen will likewise be able to utilize data from the `dataContext` by just referring to it via `ruleScope`.

    Parameters:
      `autoPopulateData` - New autoPopulateData value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getAutoPopulateData

    public Boolean getAutoPopulateData()
    If a `dataContext` is provided, should subcomponents automatically bind to the data?

    In general, if you provide a `primaryKey` value for a record, that specific record will be shown or edited, or have its related records loaded. If you provide other field values without the primaryKey value, those values will be treated as either criteria (for a grid) or as initial values (for a form).

    Components will respond to `dataContext` differently depending on whether they typically work with just a single record (such as `form` or a `DetailViewer`), or whether they usually work with lists of records (such as `ListGrid` or `TileGrid`, which have `component.dataArity` set to `multipe` by default).

    Specifically, the following rules are used:

    1. for a singular component (eg forms, detailViewers):
       - if only the PK (primary key) value is provided, the component will fetch the singular record and display or edit it
       - if the PK is provided along with other values, the component will assume it has a complete record, and display or edit it
       - if only non-PK values are provided, the component will assume these are initial values
    2. for a multiple component (eg listGrid, tileGrid):
       - if only non-PK values are provided, the component will use these as criteria. For example, a grid bound to an Orders DataSource with `dataContext` of Status:"In Process" would fetch records with that status
       - if the PK is provided, and the component's DataSource is related to one of the DataSources in the `dataContext`, related records will be fetched, using the PK value (similarly to if `fetchRelatedData()` had been called. For example, if an orderNumber value was provided, a grid bound to OrderDetail would fetch line items for that orderNumber.
       - if an array of multiple records is provided, that data is used as if setData() had been called on the component
    If any of these behaviors is not desired, you can just set `autoPopulateData` to false on the specific component that should not be auto-populated.

    Specific examples, using the Order and OrderDetail sample DataSources, where OrderDetail records are associated (many-to-1) with Order records, and the PK of Order is orderNumber:

    1. a form or DetailViewer bound to Order and a ListGrid bound to OrderDetail:
       - if an orderNumber is provided, the form or DetailViewer would show that order, and the grid would show related OrderDetail records
       - if only orderNumber is provided (no additional fields), the full Order record is automatically fetched for the form or DetailViewer

       This fulfills a common use case of viewing or editing an Order and its related OrderDetail records.

    2. a grid bound to Order and a second grid bound to OrderDetail
       - if values such as orderStatus : "On Hold" were provided, the Order grid uses those as criteria
       - the OrderDetail grid does nothing

       This fulfills a common use case of viewing Order records that match certain criteria. The OrderDetail grid would generally be populated only by an event handler installed on the Order grid, which would call `fetchRelatedData`.

    3. a grid and form both bound to Order
       - if values such as orderStatus : "On Hold" were provided, the Order grid uses those as criteria, and the form uses those as initial values

       This fulfills two possible use cases:

       - the form is a SearchForm for searching the grid, so it should show the same criteria as are applied to the grid
       - the form is for editing the selected record in the grid, or adding new ones. It is ready to either add a new record, or for the user to select a record to show in the form, typically via logic added to the grid (e.g. `recordClick` -> `form.editSelectedData()`.

    By default, `autoPopulateData` is true for any component that is contained with a "screen" `RPCManager.createScreen()` and false for any component that is an `com.smartgwt.client.types.AutoChild`.

    Note that, if there is a non-DBC in your screen that wants to access fields in the expected dataContext, the DynamicProperty can refer to properties that auto-populated DBCs will place into the ruleContext. For example, with a DynamicForm "itemEditor" bound to "supplyItem", a header above could use itemEditor.values.itemName to display the name of the item. The header will then show the expected value as soon as the DynamicForm is auto-populated.

    Similarly, the `DataView.drawn()` StringMethod fires after auto-population has occurred, so any startup actions in a screen will likewise be able to utilize data from the `dataContext` by just referring to it via `ruleScope`.

    Returns:
      Current autoPopulateData value. Default value is null

  - ### setAutoShowParent

    public Canvas setAutoShowParent(Boolean autoShowParent)
    If set to true, the widget's parent (if any) will automatically be shown whenever the widget is shown.

    Note : This is an advanced setting

    Parameters:
      `autoShowParent` - New autoShowParent value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Appearance overview and related methods`

  - ### getAutoShowParent

    public Boolean getAutoShowParent()
    If set to true, the widget's parent (if any) will automatically be shown whenever the widget is shown.
    Returns:
      Current autoShowParent value. Default value is false
    See Also:
      - `Appearance overview and related methods`

  - ### setBackgroundColor

    public Canvas setBackgroundColor(String backgroundColor)
    The background color for this widget. It corresponds to the CSS background-color attribute. You can set this property to an RGB value (e.g. #22AAFF) or a named color (e.g. red) from a list of browser supported color names.
    If this method is called after the component has been drawn/initialized: Sets the background color of this component to `newColor`.
    Parameters:
      `backgroundColor` - new background color, or `null` to remove the current background color. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `CSSColor`
      - `Appearance overview and related methods`

  - ### getBackgroundColor

    public String getBackgroundColor()
    The background color for this widget. It corresponds to the CSS background-color attribute. You can set this property to an RGB value (e.g. #22AAFF) or a named color (e.g. red) from a list of browser supported color names.
    Returns:
      Current backgroundColor value. Default value is null
    See Also:
      - `CSSColor`
      - `Appearance overview and related methods`

  - ### setBackgroundImage

    public Canvas setBackgroundImage(String backgroundImage)
    URL for a background image for this widget (corresponding to the CSS "background-image" attribute).
    If this method is called after the component has been drawn/initialized: Sets the background to an image file given by newImage. This URL should be given as a string relative to the image directory for the page (./images by default).
    Parameters:
      `backgroundImage` - new URL (local to Page image directory) for background image. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SCImgURL`
      - `Appearance overview and related methods`

  - ### getBackgroundImage

    public String getBackgroundImage()
    URL for a background image for this widget (corresponding to the CSS "background-image" attribute).
    Returns:
      Current backgroundImage value. Default value is null
    See Also:
      - `SCImgURL`
      - `Appearance overview and related methods`

  - ### setBackgroundPosition

    public Canvas setBackgroundPosition(String backgroundPosition) throws IllegalStateException
    Specifies how the background image should be positioned on the widget. It corresponds to the CSS background-position attribute. If unset, no background-position attribute is specified if a background image is specified.
    Parameters:
      `backgroundPosition` - New backgroundPosition value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Appearance overview and related methods`

  - ### getBackgroundPosition

    public String getBackgroundPosition()
    Specifies how the background image should be positioned on the widget. It corresponds to the CSS background-position attribute. If unset, no background-position attribute is specified if a background image is specified.
    Returns:
      Current backgroundPosition value. Default value is null
    See Also:
      - `Appearance overview and related methods`

  - ### setBackgroundRepeat

    public Canvas setBackgroundRepeat(BackgroundRepeat backgroundRepeat)
    Specifies how the background image should be tiled if this widget is larger than the image. It corresponds to the CSS `background-repeat` attribute.

    The default of null means no `background-repeat` CSS will be written out. See `BackgroundRepeat` type for details on other settings.

    NOTE: this setting directly sets the CSS property `background-repeat` but does not attempt to work around various known bugs with this setting, or lack of support in IE6. If you need to apply CSS-based workarounds for browser limitations with this setting, it's best to do so via setting `styleName`.

    Parameters:
      `backgroundRepeat` - New backgroundRepeat value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Appearance overview and related methods`

  - ### getBackgroundRepeat

    public BackgroundRepeat getBackgroundRepeat()
    Specifies how the background image should be tiled if this widget is larger than the image. It corresponds to the CSS `background-repeat` attribute.

    The default of null means no `background-repeat` CSS will be written out. See `BackgroundRepeat` type for details on other settings.

    NOTE: this setting directly sets the CSS property `background-repeat` but does not attempt to work around various known bugs with this setting, or lack of support in IE6. If you need to apply CSS-based workarounds for browser limitations with this setting, it's best to do so via setting `styleName`.

    Returns:
      Current backgroundRepeat value. Default value is null
    See Also:
      - `Appearance overview and related methods`

  - ### setBorder

    public Canvas setBorder(String border)
    Set the CSS border of this component, as a CSS string including border-width, border-style, and/or color (eg "2px solid blue").

    This property applies the same border to all four sides of this component. Different per-side borders can be set in a CSS style and applied via `styleName`.

    If a `grouping frame` is being shown then border is derived from the `groupBorderCSS` attribute, not from the explicit border property.
    If this method is called after the component has been drawn/initialized: Set the CSS border of this component, as a CSS string including border-width, border-style, and/or color (eg "2px solid blue").

    This property applies the same border to all four sides of this component. Different per-side borders can be set in a CSS style and applied via `styleName`.

    Parameters:
      `border` - new border to set to (eg: "2px solid black"). Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Appearance overview and related methods`

  - ### getBorder

    public String getBorder()
    Set the CSS border of this component, as a CSS string including border-width, border-style, and/or color (eg "2px solid blue").

    This property applies the same border to all four sides of this component. Different per-side borders can be set in a CSS style and applied via `styleName`.

    If a `grouping frame` is being shown then border is derived from the `groupBorderCSS` attribute, not from the explicit border property.

    Returns:
      Current border value. Default value is null
    See Also:
      - `Appearance overview and related methods`

  - ### setBorderRadius

    public Canvas setBorderRadius(String borderRadius)
    The CSS border-radius for this widget. The value can be any variant of a CSS border-radius value - that is, from 1 to 4 space-separated px values, where one value affects all corners and 4 values affects individual corners. For example "10px" applies a 10px radius to all corners, where "5px 10px 15px 20px" applies a different radius to each corner, clockwise from Top-Left: "TL TR BR BL".
    Parameters:
      `borderRadius` - New borderRadius value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Appearance overview and related methods`

  - ### getBorderRadius

    public String getBorderRadius()
    The CSS border-radius for this widget. The value can be any variant of a CSS border-radius value - that is, from 1 to 4 space-separated px values, where one value affects all corners and 4 values affects individual corners. For example "10px" applies a 10px radius to all corners, where "5px 10px 15px 20px" applies a different radius to each corner, clockwise from Top-Left: "TL TR BR BL".
    Returns:
      Current borderRadius value. Default value is null
    See Also:
      - `Appearance overview and related methods`

  - ### setCanAcceptDrop

    public Canvas setCanAcceptDrop(Boolean canAcceptDrop)
    Indicates that this object can receive dropped widgets (i.e. other widgets can be dropped on top of it).

    Note : This is an advanced setting

    Parameters:
      `canAcceptDrop` - New canAcceptDrop value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`
      - Drag create Example

  - ### getCanAcceptDrop

    public Boolean getCanAcceptDrop()
    Indicates that this object can receive dropped widgets (i.e. other widgets can be dropped on top of it).
    Returns:
      Current canAcceptDrop value. Default value is false
    See Also:
      - `Drag and Drop`
      - Drag create Example

  - ### setCanAdaptHeight

    public Canvas setCanAdaptHeight(Boolean canAdaptHeight)
    See `canAdaptWidth`.
    Parameters:
      `canAdaptHeight` - New canAdaptHeight value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getCanAdaptHeight

    public Boolean getCanAdaptHeight()
    See `canAdaptWidth`.
    Returns:
      Current canAdaptHeight value. Default value is null

  - ### setCanAdaptWidth

    public Canvas setCanAdaptWidth(Boolean canAdaptWidth)
    Indicates that this component is able to render itself at multiple possible sizes, in order to fit into less space when very little space is available, or to display more information or provide more immediate access to functionality when more space is available.

    Unlike simply indicating a flexible size via width:"*", setting `canAdaptWidth` indicates that a component has 2 (or more) different ways of rendering itself with different discrete sizes, but does not have the ability to use every additional available pixel.

    For example, a menu embedded in a toolbar might show as only a fixed-size icon which reveals menu options when clicked, or if enough space is available, could show all of the menu options directly in the toolbar. In this example, the menu should either be allocated just enough space for an icon, or enough space for all options to appear inline; any other amount of space being allocated is just a waste.

    When a component with `canAdaptWidth` is part of a Layout, `AdaptWidthByCustomizer.adaptWidthBy()` will be called every time component sizes are being calculated, passing a positive or negative pixel value:

    - a positive pixel value indicates a surplus - all other component's minimum sizes can be accommodated, including any `minWidth` declared on the `canAdaptWidth` component itself
    - a negative pixel value indicates that the containing layout is going to be forced to `Overflow` (introduce scrollbars, clip content, etc) unless some component or set of components gives up at least this many pixels

    If a non-zero value is returned from `adaptWidthBy`, this means that the component is willing to shrink or expand by that many pixels. Returning 0 means that the component is unable to reduce size further, or for a surplus, cannot make good use of the surplus space.

    - A call to `AdaptWidthByCustomizer.adaptWidthBy()` may surrender as many pixels as desired (as long as the widget won't drop below its minimum allowed width), no matter whether a positive (surplus) or negative (overflow) pixel value is supplied, but
    - A call to `AdaptWidthByCustomizer.adaptWidthBy()` may not increase its size by more than the number of offered pixels - so if an overflow is present, it may not increase its size at all.

    Note that when the initial width is specified as a stretch size (e.g. "*"), then after `AdaptWidthByCustomizer.adaptWidthBy()` is called, the Framework will stretch (but not shrink) the member like any other stretch-size Layout member, but the `unadaptedWidth` argument will always reflect the unstretched width requested by the previous call to `AdaptWidthByCustomizer.adaptWidthBy()`. This behavior may be disabled by specifying the initial width as a number, or leaving it unspecified.

    Behavior is slightly different for overflow: "visible" members - in this case the `unadaptedWidth` passed in will reflect the current visible width of the member, rather than the last width requested by the previous call to `AdaptWidthByCustomizer.adaptWidthBy()` or the specified width (on the first call). However, note that the visible length will match your requested width unless the member is actually overflowed. Stretch sizing is not supported for adaptive-width members with overflow: "visible".

    Caution: you must either determine the current size of the canvas by maintaining your own internal state, or use the `unadaptedWidth` parameter passed to `AdaptWidthByCustomizer.adaptWidthBy()`. You must not call `getWidth()` or `getVisibleWidth()` on the canvas itself inside `AdaptWidthByCustomizer.adaptWidthBy()` as the size is in the processing of being determined, but you may draw children or call `getVisibleWidth()` on them, as we guarantee that the adaptive-width canvas is drawn before the first call to `AdaptWidthByCustomizer.adaptWidthBy()`. An example of drawing children in `AdaptWidthByCustomizer.adaptWidthBy()` to compute overall width may be seen in the Inlined Menu Mobile Sample.

    Note that reasonable settings for `minWidth` should be applied to all other flexible-sized members of a layout where a `canAdaptWidth` component appears, because when too little space is available, a `canAdaptWidth` component will absorb all available space until minimums for other components are hit (or the `canAdaptWidth` component reaches its maximum size). If more than one `canAdaptWidth` component is present, `adaptiveWidthPriority` to give priority to a particular component when allocating space.

    All of the above behaviors are exactly the same for height, using `canAdaptHeight` and `AdaptHeightByCustomizer.adaptHeightBy()`.

    Parameters:
      `canAdaptWidth` - New canAdaptWidth value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setCanAdaptHeight(java.lang.Boolean)`
      - `AdaptWidthByCustomizer.adaptWidthBy(int, int)`
      - `AdaptHeightByCustomizer.adaptHeightBy(int, int)`
      - Inlined Menu Example

  - ### getCanAdaptWidth

    public Boolean getCanAdaptWidth()
    Indicates that this component is able to render itself at multiple possible sizes, in order to fit into less space when very little space is available, or to display more information or provide more immediate access to functionality when more space is available.

    Unlike simply indicating a flexible size via width:"*", setting `canAdaptWidth` indicates that a component has 2 (or more) different ways of rendering itself with different discrete sizes, but does not have the ability to use every additional available pixel.

    For example, a menu embedded in a toolbar might show as only a fixed-size icon which reveals menu options when clicked, or if enough space is available, could show all of the menu options directly in the toolbar. In this example, the menu should either be allocated just enough space for an icon, or enough space for all options to appear inline; any other amount of space being allocated is just a waste.

    When a component with `canAdaptWidth` is part of a Layout, `AdaptWidthByCustomizer.adaptWidthBy()` will be called every time component sizes are being calculated, passing a positive or negative pixel value:

    - a positive pixel value indicates a surplus - all other component's minimum sizes can be accommodated, including any `minWidth` declared on the `canAdaptWidth` component itself
    - a negative pixel value indicates that the containing layout is going to be forced to `Overflow` (introduce scrollbars, clip content, etc) unless some component or set of components gives up at least this many pixels

    If a non-zero value is returned from `adaptWidthBy`, this means that the component is willing to shrink or expand by that many pixels. Returning 0 means that the component is unable to reduce size further, or for a surplus, cannot make good use of the surplus space.

    - A call to `AdaptWidthByCustomizer.adaptWidthBy()` may surrender as many pixels as desired (as long as the widget won't drop below its minimum allowed width), no matter whether a positive (surplus) or negative (overflow) pixel value is supplied, but
    - A call to `AdaptWidthByCustomizer.adaptWidthBy()` may not increase its size by more than the number of offered pixels - so if an overflow is present, it may not increase its size at all.

    Note that when the initial width is specified as a stretch size (e.g. "*"), then after `AdaptWidthByCustomizer.adaptWidthBy()` is called, the Framework will stretch (but not shrink) the member like any other stretch-size Layout member, but the `unadaptedWidth` argument will always reflect the unstretched width requested by the previous call to `AdaptWidthByCustomizer.adaptWidthBy()`. This behavior may be disabled by specifying the initial width as a number, or leaving it unspecified.

    Behavior is slightly different for overflow: "visible" members - in this case the `unadaptedWidth` passed in will reflect the current visible width of the member, rather than the last width requested by the previous call to `AdaptWidthByCustomizer.adaptWidthBy()` or the specified width (on the first call). However, note that the visible length will match your requested width unless the member is actually overflowed. Stretch sizing is not supported for adaptive-width members with overflow: "visible".

    Caution: you must either determine the current size of the canvas by maintaining your own internal state, or use the `unadaptedWidth` parameter passed to `AdaptWidthByCustomizer.adaptWidthBy()`. You must not call `getWidth()` or `getVisibleWidth()` on the canvas itself inside `AdaptWidthByCustomizer.adaptWidthBy()` as the size is in the processing of being determined, but you may draw children or call `getVisibleWidth()` on them, as we guarantee that the adaptive-width canvas is drawn before the first call to `AdaptWidthByCustomizer.adaptWidthBy()`. An example of drawing children in `AdaptWidthByCustomizer.adaptWidthBy()` to compute overall width may be seen in the Inlined Menu Mobile Sample.

    Note that reasonable settings for `minWidth` should be applied to all other flexible-sized members of a layout where a `canAdaptWidth` component appears, because when too little space is available, a `canAdaptWidth` component will absorb all available space until minimums for other components are hit (or the `canAdaptWidth` component reaches its maximum size). If more than one `canAdaptWidth` component is present, `adaptiveWidthPriority` to give priority to a particular component when allocating space.

    All of the above behaviors are exactly the same for height, using `canAdaptHeight` and `AdaptHeightByCustomizer.adaptHeightBy()`.

    Returns:
      Current canAdaptWidth value. Default value is null
    See Also:
      - `getCanAdaptHeight()`
      - `AdaptWidthByCustomizer.adaptWidthBy(int, int)`
      - `AdaptHeightByCustomizer.adaptHeightBy(int, int)`
      - Inlined Menu Example

  - ### setCanDrag

    public Canvas setCanDrag(Boolean canDrag)
    Indicates whether this widget can initiate custom drag-and-drop operations (other than reposition or resize). Normally `canDragReposition` or `canDragResize` would be used instead of this property.

    Note: this property may be manipulated by higher-level dragging semantics.

    If `useNativeDrag` is true and this widget has been drawn, then this widget must be `redrawn` in order for a change of the value of this attribute to take effect.

    Note : This is an advanced setting

    Parameters:
      `canDrag` - New canDrag value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`
      - Drag create Example

  - ### getCanDrag

    public Boolean getCanDrag()
    Indicates whether this widget can initiate custom drag-and-drop operations (other than reposition or resize). Normally `canDragReposition` or `canDragResize` would be used instead of this property.

    Note: this property may be manipulated by higher-level dragging semantics.

    If `useNativeDrag` is true and this widget has been drawn, then this widget must be `redrawn` in order for a change of the value of this attribute to take effect.

    Returns:
      Current canDrag value. Default value is false
    See Also:
      - `Drag and Drop`
      - Drag create Example

  - ### setCanDragReposition

    public Canvas setCanDragReposition(Boolean canDragReposition)
    Indicates whether this widget can be moved by a user of your application by simply dragging with the mouse.

    Note : This is an advanced setting

    Parameters:
      `canDragReposition` - New canDragReposition value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`
      - Drag effects Example

  - ### getCanDragReposition

    public Boolean getCanDragReposition()
    Indicates whether this widget can be moved by a user of your application by simply dragging with the mouse.
    Returns:
      Current canDragReposition value. Default value is false
    See Also:
      - `Drag and Drop`
      - Drag effects Example

  - ### setCanDragResize

    public Canvas setCanDragResize(Boolean canDragResize)
    Indicates whether this widget can be resized by dragging on the edges and/or corners of the widget with the mouse.

    Note : This is an advanced setting

    Parameters:
      `canDragResize` - New canDragResize value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`
      - Drag resize Example

  - ### getCanDragResize

    public Boolean getCanDragResize()
    Indicates whether this widget can be resized by dragging on the edges and/or corners of the widget with the mouse.
    Returns:
      Current canDragResize value. Default value is false
    See Also:
      - `Drag and Drop`
      - Drag resize Example

  - ### setCanDragScroll

    public Canvas setCanDragScroll(boolean canDragScroll)
    If this Canvas is canAcceptDrop:true, when the user drags a droppable widget over an edge of the widget, should we scroll to show the rest of the widget's content? Returned from canvas.shouldDragScroll() if there are scrollbars.

    Note : This is an advanced setting

    Parameters:
      `canDragScroll` - New canDragScroll value. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `shouldDragScroll()`

  - ### getCanDragScroll

    public boolean getCanDragScroll()
    If this Canvas is canAcceptDrop:true, when the user drags a droppable widget over an edge of the widget, should we scroll to show the rest of the widget's content? Returned from canvas.shouldDragScroll() if there are scrollbars.
    Returns:
      Current canDragScroll value. Default value is true
    See Also:
      - `shouldDragScroll()`

  - ### setCanDrop

    public Canvas setCanDrop(Boolean canDrop)
    Indicates that this object can be dropped on top of other widgets. Only valid if canDrag or canDragReposition is true.

    Note : This is an advanced setting

    Parameters:
      `canDrop` - New canDrop value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`
      - Drag create Example

  - ### getCanDrop

    public Boolean getCanDrop()
    Indicates that this object can be dropped on top of other widgets. Only valid if canDrag or canDragReposition is true.
    Returns:
      Current canDrop value. Default value is false
    See Also:
      - `Drag and Drop`
      - Drag create Example

  - ### setCanDropBefore

    public Canvas setCanDropBefore(Boolean canDropBefore)
    When explicitly set to false, disallows drop before this member in the Layout.

    Note : This is an advanced setting

    Parameters:
      `canDropBefore` - New canDropBefore value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Layout`
      - `LayoutMember overview and related methods`

  - ### getCanDropBefore

    public Boolean getCanDropBefore()
    When explicitly set to false, disallows drop before this member in the Layout.
    Returns:
      Current canDropBefore value. Default value is null
    See Also:
      - `Layout`
      - `LayoutMember overview and related methods`

  - ### setCanFocus

    public Canvas setCanFocus(Boolean canFocus)
    Can this widget be allowed to become the target of keyboard events?

    If canFocus is unset (the default), only scrollable widgets with visible scrollbars are focusable, to allow for keyboard scrolling.

    A widget normally receives focus by being clicked on or tabbed to.
    If this method is called after the component has been drawn/initialized: Change whether a widget can accept keyboard focus.

    Note : This is an advanced setting

    Parameters:
      `canFocus` - whether the widget should now accept focus. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Focus`
      - Focus & Tabbing Example

  - ### getCanFocus

    public Boolean getCanFocus()
    Can this widget be allowed to become the target of keyboard events?

    If canFocus is unset (the default), only scrollable widgets with visible scrollbars are focusable, to allow for keyboard scrolling.

    A widget normally receives focus by being clicked on or tabbed to.

    Returns:
      Current canFocus value. Default value is null
    See Also:
      - `Focus`
      - Focus & Tabbing Example

  - ### setCanHover

    public Canvas setCanHover(Boolean canHover)
    Will this Canvas fire hover events when the user hovers over it, or one of its children?
    Parameters:
      `canHover` - New canHover value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setShowHover(java.lang.Boolean)`
      - `HoverEvent`

  - ### getCanHover

    public Boolean getCanHover()
    Will this Canvas fire hover events when the user hovers over it, or one of its children?
    Returns:
      Current canHover value. Default value is null
    See Also:
      - `getShowHover()`
      - `HoverEvent`

  - ### setCanSelectText

    public Canvas setCanSelectText(Boolean canSelectText)
    Whether native drag selection of contained text is allowed within this Canvas.

    Note that setting this property to `false` will not avoid text selection which is initiated outside this Canvas from continuing into this Canvas, even if text selection began in another Canvas.

    Note : This is an advanced setting

    Parameters:
      `canSelectText` - New canSelectText value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getCanSelectText

    public Boolean getCanSelectText()
    Whether native drag selection of contained text is allowed within this Canvas.

    Note that setting this property to `false` will not avoid text selection which is initiated outside this Canvas from continuing into this Canvas, even if text selection began in another Canvas.

    Returns:
      Current canSelectText value. Default value is false

  - ### getCanvasItem

    public CanvasItem getCanvasItem() throws IllegalStateException
    If this canvas is being displayed in a `CanvasItem`, this property will be set to point at the item. Otherwise this property will be null.

    Note : This method should be called only after the widget has been rendered.

    Returns:
      Current canvasItem value. Default value is null
    Throws:
      `IllegalStateException` - if this widget has not yet been rendered.

  - ### getChildren

    public Canvas[] getChildren()
    Array of all Canvii that are immediate children of this Canvas.

    Use `addChild()` and `removeChild()` to add and remove children after a Canvas has been created/drawn.

    See `Containment` for an overview of parent/child relationships.

    Returns:
      Current children value. Default value is null
    See Also:
      - `Component Containment and Hierarchy`

  - ### getChildrenAsStringArray

    public String[] getChildrenAsStringArray()
    Array of all Canvii that are immediate children of this Canvas.

    Use `addChild()` and `removeChild()` to add and remove children after a Canvas has been created/drawn.

    See `Containment` for an overview of parent/child relationships.

    Returns:
      Current children value. Default value is null
    See Also:
      - `Component Containment and Hierarchy`

  - ### setChildrenResizeSnapAlign

    public Canvas setChildrenResizeSnapAlign(Boolean childrenResizeSnapAlign)
    Flag to disable snapping to alignment when children of this Canvas are resized
    Parameters:
      `childrenResizeSnapAlign` - New childrenResizeSnapAlign value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getChildrenResizeSnapAlign

    public Boolean getChildrenResizeSnapAlign()
    Flag to disable snapping to alignment when children of this Canvas are resized
    Returns:
      Current childrenResizeSnapAlign value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setChildrenSnapAlign

    public Canvas setChildrenSnapAlign(Boolean childrenSnapAlign)
    If enabled while `childrenSnapToGrid` is enabled, children dragged within this Canvas will also snap to positions where their edges or center lines would be aligned with the edges or centers of other components, and lines will be shown to point out the possible alignment (with appearance controlled by `snapAlignCenterLineStyle` and `snapAlignEdgeLineStyle` respectively.

    By default, edge- or center-snapping is enabled for all components, but the set of eligible components can be explicitly set via `snapAlignCandidates`.

    See also `childrenSnapCenterAlign` and `childrenSnapEdgeAlign` for enabling or disabling center alignment or edge alignment individually.

    Parameters:
      `childrenSnapAlign` - New childrenSnapAlign value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getChildrenSnapAlign

    public Boolean getChildrenSnapAlign()
    If enabled while `childrenSnapToGrid` is enabled, children dragged within this Canvas will also snap to positions where their edges or center lines would be aligned with the edges or centers of other components, and lines will be shown to point out the possible alignment (with appearance controlled by `snapAlignCenterLineStyle` and `snapAlignEdgeLineStyle` respectively.

    By default, edge- or center-snapping is enabled for all components, but the set of eligible components can be explicitly set via `snapAlignCandidates`.

    See also `childrenSnapCenterAlign` and `childrenSnapEdgeAlign` for enabling or disabling center alignment or edge alignment individually.

    Returns:
      Current childrenSnapAlign value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setChildrenSnapCenterAlign

    public Canvas setChildrenSnapCenterAlign(Boolean childrenSnapCenterAlign)
    See `childrenSnapAlign`. This setting enables or disables snapping on center alignment only.
    Parameters:
      `childrenSnapCenterAlign` - New childrenSnapCenterAlign value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getChildrenSnapCenterAlign

    public Boolean getChildrenSnapCenterAlign()
    See `childrenSnapAlign`. This setting enables or disables snapping on center alignment only.
    Returns:
      Current childrenSnapCenterAlign value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setChildrenSnapEdgeAlign

    public Canvas setChildrenSnapEdgeAlign(Boolean childrenSnapEdgeAlign)
    See `childrenSnapAlign`. This setting enables or disables snapping on edge alignment only.
    Parameters:
      `childrenSnapEdgeAlign` - New childrenSnapEdgeAlign value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getChildrenSnapEdgeAlign

    public Boolean getChildrenSnapEdgeAlign()
    See `childrenSnapAlign`. This setting enables or disables snapping on edge alignment only.
    Returns:
      Current childrenSnapEdgeAlign value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setChildrenSnapResizeToGrid

    public Canvas setChildrenSnapResizeToGrid(Boolean childrenSnapResizeToGrid)
    If true, causes this canvas's children to snap to its grid when resizing. This behavior can be overridden on a per-child basis by setting the `snapToGrid` or `snapResizeToGrid` value on the child.
    Parameters:
      `childrenSnapResizeToGrid` - New childrenSnapResizeToGrid value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getChildrenSnapResizeToGrid

    public Boolean getChildrenSnapResizeToGrid()
    If true, causes this canvas's children to snap to its grid when resizing. This behavior can be overridden on a per-child basis by setting the `snapToGrid` or `snapResizeToGrid` value on the child.
    Returns:
      Current childrenSnapResizeToGrid value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setChildrenSnapToGrid

    public Canvas setChildrenSnapToGrid(Boolean childrenSnapToGrid)
    If true, causes this canvas's children to snap to its grid when dragging. This behavior can be overridden on a per-child basis by setting the `snapToGrid` value on the child.
    Parameters:
      `childrenSnapToGrid` - New childrenSnapToGrid value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getChildrenSnapToGrid

    public Boolean getChildrenSnapToGrid()
    If true, causes this canvas's children to snap to its grid when dragging. This behavior can be overridden on a per-child basis by setting the `snapToGrid` value on the child.
    Returns:
      Current childrenSnapToGrid value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getComponentMask

    public Canvas getComponentMask() throws IllegalStateException
    Automatically generated mask canvas displayed when `showComponentMask()` is called.

    This component is an AutoChild named "componentMask". For an overview of how to use and configure AutoChildren, see `Using AutoChildren`.

    Returns:
      Current componentMask value. Default value is null
    Throws:
      `IllegalStateException` - if this widget has not yet been rendered.
    See Also:
      - `getComponentMaskDefaults()`

  - ### setComponentMaskDefaults

    public Canvas setComponentMaskDefaults(Canvas componentMaskDefaults) throws IllegalStateException
    Defaults for the `componentMask` autoChild. Default properties include `backgroundColor` being set to `"black"` and `opacity` being set to `20`.
    Parameters:
      `componentMaskDefaults` - New componentMaskDefaults value. Default value is {...}
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `SGWTProperties`

  - ### getComponentMaskDefaults

    public Canvas getComponentMaskDefaults()
    Defaults for the `componentMask` autoChild. Default properties include `backgroundColor` being set to `"black"` and `opacity` being set to `20`.
    Returns:
      Current componentMaskDefaults value. Default value is {...}

  - ### setContents

    public Canvas setContents(String contents)
    The contents of a canvas or label widget. Any HTML string is acceptable.
    If this method is called after the component has been drawn/initialized: Changes the contents of a widget to newContents, an HTML string.

    When `dynamicContents` is set, `setContents()` can also be called with no arguments to cause contents to be re-evaluated.

    Note : This is an advanced setting

    Parameters:
      `contents` - an HTML string to be set as the contents of this widget. Default value is "&nbsp;"
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setDynamicContents(java.lang.Boolean)`
      - `HTMLString`

  - ### getContents

    public String getContents()
    The contents of a canvas or label widget. Any HTML string is acceptable.
    Returns:
      Returns the contents of a Canvas. The contents are an HTML string. Default value is "&nbsp;"
    See Also:
      - `getDynamicContents()`
      - `HTMLString`

  - ### setContextMenu

    public Canvas setContextMenu(Menu contextMenu)
    Context menu to show for this object, an instance of the Menu widget.

    Note: if `destroy()` is called on a canvas, any specified context menu is not automatically destroyed as well. This is in contrast to `MenuButton`s which automatically destroy their specified `MenuButton.menu` by default. The behavior is intentional as context menus are commonly reused across components.

    Note : This is an advanced setting

    Parameters:
      `contextMenu` - New contextMenu value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `ShowContextMenuEvent`
      - `Cues overview and related methods`
      - Context menus Example

  - ### getContextMenu

    public Menu getContextMenu()
    Context menu to show for this object, an instance of the Menu widget.

    Note: if `destroy()` is called on a canvas, any specified context menu is not automatically destroyed as well. This is in contrast to `MenuButton`s which automatically destroy their specified `MenuButton.menu` by default. The behavior is intentional as context menus are commonly reused across components.

    Returns:
      Current contextMenu value. Default value is null
    See Also:
      - `ShowContextMenuEvent`
      - `Cues overview and related methods`
      - Context menus Example

  - ### setCorrectZoomOverflow

    public Canvas setCorrectZoomOverflow(Boolean correctZoomOverflow)
    Whether the Framework should correct for erroneous scrollHeight and scrollWidth values reported by the browser when zoomed (via browser or OS-level zoom) by allowing `maxZoomOverflowError` of overflow before enabling scrolling and displaying custom scrollbars. Only relevant when `overflow` is "auto".

    This property is defaulted to true in the `Canvas` prototype for those browsers where the situation has been observed, except for Firefox, where a better solution is applied that doesn't rely on `maxZoomOverflowError` and never clips any content. Setting this property false will disable the workaround for all browsers, including Firefox. Without a workaround, scrollbars may oscillate rapidly when the browser or OS is zoomed.

    Note : This is an advanced setting

    Parameters:
      `correctZoomOverflow` - New correctZoomOverflow value. Default value is varies
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getCorrectZoomOverflow

    public Boolean getCorrectZoomOverflow()
    Whether the Framework should correct for erroneous scrollHeight and scrollWidth values reported by the browser when zoomed (via browser or OS-level zoom) by allowing `maxZoomOverflowError` of overflow before enabling scrolling and displaying custom scrollbars. Only relevant when `overflow` is "auto".

    This property is defaulted to true in the `Canvas` prototype for those browsers where the situation has been observed, except for Firefox, where a better solution is applied that doesn't rely on `maxZoomOverflowError` and never clips any content. Setting this property false will disable the workaround for all browsers, including Firefox. Without a workaround, scrollbars may oscillate rapidly when the browser or OS is zoomed.

    Returns:
      Current correctZoomOverflow value. Default value is varies

  - ### setCursor

    public Canvas setCursor(Cursor cursor)
    Specifies the css cursor image to display when the mouse pointer is over this component. See `Cursor` for valid values.

    Note that the cursor may also be controlled by the following attributes in various cases:

    - `disabledCursor`
    - `noDropCursor`
    - `dragRepositionCursor`
    - `edgeCursorMap`

    If no cursor is explicitly specified for a component, the cursor will be derived from the component's `ancestors`. If `cursor` is not explicitly set in the ancestor chain, `"default"` will be used.
    If this method is called after the component has been drawn/initialized: Sets the cursor for this widget to cursor. See the cursor property for possible values.

    Note : This is an advanced setting

    Parameters:
      `cursor` - new cursor. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Cues overview and related methods`
      - Drag create Example
      - Cursors Example

  - ### getCursor

    public Cursor getCursor()
    Specifies the css cursor image to display when the mouse pointer is over this component. See `Cursor` for valid values.

    Note that the cursor may also be controlled by the following attributes in various cases:

    - `disabledCursor`
    - `noDropCursor`
    - `dragRepositionCursor`
    - `edgeCursorMap`

    If no cursor is explicitly specified for a component, the cursor will be derived from the component's `ancestors`. If `cursor` is not explicitly set in the ancestor chain, `"default"` will be used.

    Returns:
      Current cursor value. Default value is null
    See Also:
      - `Cues overview and related methods`
      - Drag create Example
      - Cursors Example

  - ### setDataContext

    public Canvas setDataContext(DataContext dataContext)
    A mapping from `DataSource` IDs to specific `Records` from those DataSources, that `DataBoundComponents` contained within this Canvas should automatically bind to if a DataSource is provided but data is not provided (directly or indirectly, for example, indirectly via setting `ListGrid.autoFetchData`.

    See `autoPopulateData` for details on how this is done.

    DataSources included in the `dataContext` are immediately provided to `rule context` when used if no other component has done so already. These records are found in rule context 'dataContext' section (ex. `dataContext.Customer` for a Customer record in `dataContext`) so they do not conflict with normal DataSource records.
    If this method is called after the component has been drawn/initialized: Provides a new `DataContext` to the Canvas. If the DataContext is new, `DataBoundComponents` contained within this Canvas will be automatically bound as described in `dataContext`. If the DataContext replaces an existing one, any contained components that were originally bound against the DataContext will be re-bound.

    Parameters:
      `dataContext` - dataContext to use for automatic binding. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getDataContext

    public DataContext getDataContext()
    A mapping from `DataSource` IDs to specific `Records` from those DataSources, that `DataBoundComponents` contained within this Canvas should automatically bind to if a DataSource is provided but data is not provided (directly or indirectly, for example, indirectly via setting `ListGrid.autoFetchData`.

    See `autoPopulateData` for details on how this is done.

    DataSources included in the `dataContext` are immediately provided to `rule context` when used if no other component has done so already. These records are found in rule context 'dataContext' section (ex. `dataContext.Customer` for a Customer record in `dataContext`) so they do not conflict with normal DataSource records.

    Returns:
      Current dataContext value. Default value is null

  - ### setDataPath

    public Canvas setDataPath(String dataPath)
    A dataPath may be specified on any canvas. This provides a straightforward way to display or edit complex nested data.

    NOTE: the dataPath feature is intended to help certain legacy architectures, such as systems that work in terms of exchanging large messages with several different entity types in one message, and are incapable of providing separate access to each entity type.
    See the `DataPath overview` for more information.

    For components which support displaying or editing data values, (such as `DynamicForm` or `ListGrid` components), the dataPath may be set to specify how the components data is accessed. In this case the dataPath essentially specifies a nested object to edit - typically a path to a field value within a dataSource record. Note that a ValuesManager will be required to handle connecting the dataBoundcomponent to the appropriate sub object. This may be explicitly specified on the component, or a parent of the component, or automatically generated if a DataSource is specified on either the component or a parent thereof.

    To provide a simple example - if a complex object existed with the following format:

               Map values = new HashMap();
               values.put("companyName", "Some company");
               Map addressMap = new HashMap();
               addressMap.put("street", "123 Main Street");
               addressMap.put("city", "New York");
               addressMap.put("state", "NY");
               values.put("address", addressMap);

    a developer could specify a DynamicForm instance with 'dataPath' set to "address" to edit the nested address object:

               ValuesManager vm = new ValuesManager();
               Map values = new HashMap();
               values.put("companyName", "Some company");
               Map addressMap = new HashMap();
               addressMap.put("street", "123 Main Street");
               addressMap.put("city", "New York");
               addressMap.put("state", "NY");
               values.put("address", addressMap);
               vm.setValues(values);

               DynamicForm form = new DynamicForm();
               form.setValuesManager(vm);
               form.setDataPath("address");
               TextItem streetField = new TextItem("street");
               TextItem cityField = new TextItem("city");
               TextItem stateField = new TextItem("state");
               form.setItems(streetField, cityField, stateField);

    If a component is specified with a `dataPath` attribute but does not have an explicitly specified valuesManager, it will check its parent element chain for a specified valuesManager and automatically bind to that. This simplifies binding multiple components used to view or edit a nested data structure as the valuesManager needs only be defined once at a reasonably high level component. Here's an example of this approach:

               ValuesManager vm = new ValuesManager();
               Map values = new HashMap();
               values.put("companyName", "Some company");
               Map addressMap = new HashMap();
               addressMap.put("street", "123 Main Street");
               addressMap.put("city", "New York");
               addressMap.put("state", "NY");
               values.put("address", addressMap);
               vm.setValues(values);

               Layout layout = new Layout();
               layout.setValuesManager(vm);

               DynamicForm form = new DynamicForm();
               form.setDataPath("/");
               TextItem companyNameField = new TextItem("companyName");
               form.setItems(companyNameField);

               DynamicForm form1 = new DynamicForm();
               form1.setDataPath("address");
               TextItem streetField = new TextItem("street");
               TextItem cityField = new TextItem("city");
               TextItem stateField = new TextItem("state");
               form1.setItems(streetField, cityField, stateField);

               layout.addMember(form);
               layout.addMember(form1);

    Note that in this case the valuesManager is specified on a Layout, which has no 'values' management behavior of its own, but contains items with a specified dataPath which do. In this example you'd see 2 forms allowing editing of the nested data structure.

    dataPaths from multiple nested components may also be combined. For example:

               ValuesManager vm = new ValuesManager();

               Map values = new HashMap();
               values.put("companyName", "Some company");
               Map addressMap = new HashMap();
               addressMap.put("street", "123 Main Street");
               addressMap.put("city", "New York");
               addressMap.put("state", "NY");
               values.put("address", addressMap);

               Map values1 = new HashMap();
               values1.put("companyName", "Some Corporation");
               Map addressMap1 = new HashMap();
               addressMap1.put("street", "1 High Street");
               addressMap1.put("city", "New York");
               addressMap1.put("state", "NY");
               values1.put("address", addressMap1);
               values.put("parentCompany", values1);

               vm.setValues(values);
               Layout layout = new Layout();
               layout.setValuesManager(vm);

               DynamicForm form = new DynamicForm();
               form.setDataPath("/");
               TextItem companyNameField = new TextItem("companyName");
               form.setItems(companyNameField);

               DynamicForm form1 = new DynamicForm();
               form1.setDataPath("address");
               TextItem streetField = new TextItem("street");
               TextItem cityField = new TextItem("city");
               TextItem stateField = new TextItem("state");
               form1.setItems(streetField, cityField, stateField);

               Layout innerlayout = new Layout();
               innerlayout.setDataPath("parentCompany");

               DynamicForm form3 = new DynamicForm();
               form3.setDataPath("");
               StaticTextItem companyNameField1 = new StaticTextItem("companyName");
               form3.setItems(companyNameField1);

               DetailViewer detailViewer = new DetailViewer();
               detailViewer.setDataPath("address");
               DetailViewerField streetDVField = new DetailViewerField("street");
               DetailViewerField cityDVField = new DetailViewerField("city");
               DetailViewerField stateDVField = new DetailViewerField("state");
               detailViewer.setFields(streetDVField, cityDVField, stateDVField);

               innerlayout.addMember(form3);
               innerlayout.addMember(detailViewer);

               layout.addMember(form);
               layout.addMember(form1);
               layout.addMember(innerlayout);

    In this example the detailViewer will display data from the `parentCompany.address` object within the base record.

    Note that if a component has a specified dataSource and shows child components with a specified dataPath, there is no need to explicitly declare a valuesManager at all. If a component with a dataPath has a dataSource, or an ancestor with a dataSource specified, it will, a valuesManager will automatically be generated on the higher level component (and be available as `component.valuesManager`).

    ### Difference between "" and "/" - relative and absolute datapaths

    In the above example, note how the form for entering the "main" company name is given a dataPath of "/", while the form for entering the parent company name is given a dataPath of "". The difference here is exactly the same as you would find in a filesystem path: a dataPath starting with "/" is absolute, so "/" by itself means "root". A dataPath that does not start with "/" is relative, and the empty string indicates that dataPaths for items below this one in the hierarchy should apply the dataPath so far from the hierarchy above.

    If that isn't clear, consider the form for entering the parent company name in the above example. The correct dataPath to the field is `/parentCompany/companyName`. We have the "parentCompany" part of that path provided by the containing Layout, so we cannot reiterate it on the form itself. However, if we omit the dataPath property altogether, the framework will not seek to apply dataPath at all. So, we specify the empty string, which tells Smart GWT to use dataPath and to retain the portion of the path derived so far from the containment hierarchy.

    One further clarification: relative paths are only different from absolute paths if they are relative to something other than the root. So in the above example, although we specify "/" as the dataPath of the "main" company name form, we would get exactly the same behavior by specifying it as "", because the correct dataPath for the companyName field is "/companyName" - ie, it is relative to the root.
    If this method is called after the component has been drawn/initialized: Setter for the `dataPath` attribute. This method may be called directly at runtime to set the dataPath on a component, and will also be re-run automatically whenever a canvas' parent changes due to a call to addChild(). This method handles automatically binding the component to the appropriate valuesManager if necessary.

    Note : This is an advanced setting

    Parameters:
      `dataPath` - new dataPath. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setRuleScope(java.lang.String)`
      - `DataPath`

  - ### getDataPath

    public String getDataPath()
    A dataPath may be specified on any canvas. This provides a straightforward way to display or edit complex nested data.

    NOTE: the dataPath feature is intended to help certain legacy architectures, such as systems that work in terms of exchanging large messages with several different entity types in one message, and are incapable of providing separate access to each entity type.
    See the `DataPath overview` for more information.

    For components which support displaying or editing data values, (such as `DynamicForm` or `ListGrid` components), the dataPath may be set to specify how the components data is accessed. In this case the dataPath essentially specifies a nested object to edit - typically a path to a field value within a dataSource record. Note that a ValuesManager will be required to handle connecting the dataBoundcomponent to the appropriate sub object. This may be explicitly specified on the component, or a parent of the component, or automatically generated if a DataSource is specified on either the component or a parent thereof.

    To provide a simple example - if a complex object existed with the following format:

               Map values = new HashMap();
               values.put("companyName", "Some company");
               Map addressMap = new HashMap();
               addressMap.put("street", "123 Main Street");
               addressMap.put("city", "New York");
               addressMap.put("state", "NY");
               values.put("address", addressMap);

    a developer could specify a DynamicForm instance with 'dataPath' set to "address" to edit the nested address object:

               ValuesManager vm = new ValuesManager();
               Map values = new HashMap();
               values.put("companyName", "Some company");
               Map addressMap = new HashMap();
               addressMap.put("street", "123 Main Street");
               addressMap.put("city", "New York");
               addressMap.put("state", "NY");
               values.put("address", addressMap);
               vm.setValues(values);

               DynamicForm form = new DynamicForm();
               form.setValuesManager(vm);
               form.setDataPath("address");
               TextItem streetField = new TextItem("street");
               TextItem cityField = new TextItem("city");
               TextItem stateField = new TextItem("state");
               form.setItems(streetField, cityField, stateField);

    If a component is specified with a `dataPath` attribute but does not have an explicitly specified valuesManager, it will check its parent element chain for a specified valuesManager and automatically bind to that. This simplifies binding multiple components used to view or edit a nested data structure as the valuesManager needs only be defined once at a reasonably high level component. Here's an example of this approach:

               ValuesManager vm = new ValuesManager();
               Map values = new HashMap();
               values.put("companyName", "Some company");
               Map addressMap = new HashMap();
               addressMap.put("street", "123 Main Street");
               addressMap.put("city", "New York");
               addressMap.put("state", "NY");
               values.put("address", addressMap);
               vm.setValues(values);

               Layout layout = new Layout();
               layout.setValuesManager(vm);

               DynamicForm form = new DynamicForm();
               form.setDataPath("/");
               TextItem companyNameField = new TextItem("companyName");
               form.setItems(companyNameField);

               DynamicForm form1 = new DynamicForm();
               form1.setDataPath("address");
               TextItem streetField = new TextItem("street");
               TextItem cityField = new TextItem("city");
               TextItem stateField = new TextItem("state");
               form1.setItems(streetField, cityField, stateField);

               layout.addMember(form);
               layout.addMember(form1);

    Note that in this case the valuesManager is specified on a Layout, which has no 'values' management behavior of its own, but contains items with a specified dataPath which do. In this example you'd see 2 forms allowing editing of the nested data structure.

    dataPaths from multiple nested components may also be combined. For example:

               ValuesManager vm = new ValuesManager();

               Map values = new HashMap();
               values.put("companyName", "Some company");
               Map addressMap = new HashMap();
               addressMap.put("street", "123 Main Street");
               addressMap.put("city", "New York");
               addressMap.put("state", "NY");
               values.put("address", addressMap);

               Map values1 = new HashMap();
               values1.put("companyName", "Some Corporation");
               Map addressMap1 = new HashMap();
               addressMap1.put("street", "1 High Street");
               addressMap1.put("city", "New York");
               addressMap1.put("state", "NY");
               values1.put("address", addressMap1);
               values.put("parentCompany", values1);

               vm.setValues(values);
               Layout layout = new Layout();
               layout.setValuesManager(vm);

               DynamicForm form = new DynamicForm();
               form.setDataPath("/");
               TextItem companyNameField = new TextItem("companyName");
               form.setItems(companyNameField);

               DynamicForm form1 = new DynamicForm();
               form1.setDataPath("address");
               TextItem streetField = new TextItem("street");
               TextItem cityField = new TextItem("city");
               TextItem stateField = new TextItem("state");
               form1.setItems(streetField, cityField, stateField);

               Layout innerlayout = new Layout();
               innerlayout.setDataPath("parentCompany");

               DynamicForm form3 = new DynamicForm();
               form3.setDataPath("");
               StaticTextItem companyNameField1 = new StaticTextItem("companyName");
               form3.setItems(companyNameField1);

               DetailViewer detailViewer = new DetailViewer();
               detailViewer.setDataPath("address");
               DetailViewerField streetDVField = new DetailViewerField("street");
               DetailViewerField cityDVField = new DetailViewerField("city");
               DetailViewerField stateDVField = new DetailViewerField("state");
               detailViewer.setFields(streetDVField, cityDVField, stateDVField);

               innerlayout.addMember(form3);
               innerlayout.addMember(detailViewer);

               layout.addMember(form);
               layout.addMember(form1);
               layout.addMember(innerlayout);

    In this example the detailViewer will display data from the `parentCompany.address` object within the base record.

    Note that if a component has a specified dataSource and shows child components with a specified dataPath, there is no need to explicitly declare a valuesManager at all. If a component with a dataPath has a dataSource, or an ancestor with a dataSource specified, it will, a valuesManager will automatically be generated on the higher level component (and be available as `component.valuesManager`).

    ### Difference between "" and "/" - relative and absolute datapaths

    In the above example, note how the form for entering the "main" company name is given a dataPath of "/", while the form for entering the parent company name is given a dataPath of "". The difference here is exactly the same as you would find in a filesystem path: a dataPath starting with "/" is absolute, so "/" by itself means "root". A dataPath that does not start with "/" is relative, and the empty string indicates that dataPaths for items below this one in the hierarchy should apply the dataPath so far from the hierarchy above.

    If that isn't clear, consider the form for entering the parent company name in the above example. The correct dataPath to the field is `/parentCompany/companyName`. We have the "parentCompany" part of that path provided by the containing Layout, so we cannot reiterate it on the form itself. However, if we omit the dataPath property altogether, the framework will not seek to apply dataPath at all. So, we specify the empty string, which tells Smart GWT to use dataPath and to retain the portion of the path derived so far from the containment hierarchy.

    One further clarification: relative paths are only different from absolute paths if they are relative to something other than the root. So in the above example, although we specify "/" as the dataPath of the "main" company name form, we would get exactly the same behavior by specifying it as "", because the correct dataPath for the companyName field is "/companyName" - ie, it is relative to the root.

    Returns:
      Current dataPath value. Default value is null
    See Also:
      - `getRuleScope()`
      - `DataPath`

  - ### setDefaultHeight

    public Canvas setDefaultHeight(int defaultHeight)
    For custom components, establishes a default height for the component.

    For a component that should potentially be sized automatically by a Layout, set this property rather than `height` directly, because Layouts regard a height setting as an explicit size that shouldn't be changed.

    Note : This is an advanced setting

    Parameters:
      `defaultHeight` - New defaultHeight value. Default value is 100
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Sizing overview and related methods`

  - ### getDefaultHeight

    public int getDefaultHeight()
    For custom components, establishes a default height for the component.

    For a component that should potentially be sized automatically by a Layout, set this property rather than `height` directly, because Layouts regard a height setting as an explicit size that shouldn't be changed.

    Returns:
      Current defaultHeight value. Default value is 100
    See Also:
      - `Sizing overview and related methods`

  - ### setDefaultWidth

    public Canvas setDefaultWidth(int defaultWidth)
    For custom components, establishes a default width for the component.

    For a component that should potentially be sized automatically by a Layout, set this property rather than `width` directly, because Layouts regard a width setting as an explicit size that shouldn't be changed.

    Note : This is an advanced setting

    Parameters:
      `defaultWidth` - New defaultWidth value. Default value is 100
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Sizing overview and related methods`

  - ### getDefaultWidth

    public int getDefaultWidth()
    For custom components, establishes a default width for the component.

    For a component that should potentially be sized automatically by a Layout, set this property rather than `width` directly, because Layouts regard a width setting as an explicit size that shouldn't be changed.

    Returns:
      Current defaultWidth value. Default value is 100
    See Also:
      - `Sizing overview and related methods`

  - ### setDefiningProperty

    public Canvas setDefiningProperty(String definingProperty)
    This attribute denotes the name of a property to use as a `getDefiningPropertyName()` for this property when generating and resolving `AutoTest locators with search segments`.

    Note : This is an advanced setting

    Parameters:
      `definingProperty` - New definingProperty value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getDefiningProperty

    public String getDefiningProperty()
    This attribute denotes the name of a property to use as a `getDefiningPropertyName()` for this property when generating and resolving `AutoTest locators with search segments`.
    Returns:
      Current definingProperty value. Default value is null

  - ### setDefiningPropertyNameOptions

    public Canvas setDefiningPropertyNameOptions(String... definingPropertyNameOptions)
    If no explicit `definingProperty` was specified for this component, this array denotes a list of options to use as a `defining property` when generating and resolving `AutoTest locators with search segments`. The first attribute in this array that is non-null for this component will be used as the defining property for locator search segments.

    The default set of options are as follows:

          [
           "locatorName",
           "dataSource"
          ]

    Note : This is an advanced setting

    Parameters:
      `definingPropertyNameOptions` - New definingPropertyNameOptions value. Default value is [...]
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getDefiningPropertyNameOptions

    public String[] getDefiningPropertyNameOptions()
    If no explicit `definingProperty` was specified for this component, this array denotes a list of options to use as a `defining property` when generating and resolving `AutoTest locators with search segments`. The first attribute in this array that is non-null for this component will be used as the defining property for locator search segments.

    The default set of options are as follows:

          [
           "locatorName",
           "dataSource"
          ]

    Returns:
      Current definingPropertyNameOptions value. Default value is [...]

  - ### getDestroyed

    public Boolean getDestroyed() throws IllegalStateException
    If this property is set to `true`, the `destroy()` method has been called on this canvas. This implies the canvas is no longer valid. Its ID has been removed from global scope, and calling standard canvas APIs on it is likely to result in errors.

    Note : This method should be called only after the widget has been rendered.

    Returns:
      Current destroyed value. Default value is null
    Throws:
      `IllegalStateException` - if this widget has not yet been rendered.
    See Also:
      - `BaseWidget.destroy()`

  - ### getDestroying

    public Boolean getDestroying() throws IllegalStateException
    This property is set to true when the `destroy()` method is called on a widget. If this property is true, but `destroyed` is not, this indicates the canvas is in the process of being destroyed.

    Note : This method should be called only after the widget has been rendered.

    Returns:
      Current destroying value. Default value is null
    Throws:
      `IllegalStateException` - if this widget has not yet been rendered.
    See Also:
      - `BaseWidget.destroy()`

  - ### setDisabledCursor

    public Canvas setDisabledCursor(Cursor disabledCursor)
    Specifies the cursor image to display when the mouse pointer is over this widget if this widget is disabled. It corresponds to the CSS cursor attribute. See Cursor type for different cursors.

    Note : This is an advanced setting

    Parameters:
      `disabledCursor` - New disabledCursor value. Default value is Canvas.DEFAULT
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Cues overview and related methods`

  - ### getDisabledCursor

    public Cursor getDisabledCursor()
    Specifies the cursor image to display when the mouse pointer is over this widget if this widget is disabled. It corresponds to the CSS cursor attribute. See Cursor type for different cursors.
    Returns:
      Current disabledCursor value. Default value is Canvas.DEFAULT
    See Also:
      - `Cues overview and related methods`

  - ### setDisableTouchScrollingForDrag

    public Canvas setDisableTouchScrollingForDrag(Boolean disableTouchScrollingForDrag) throws IllegalStateException
    Disables `useTouchScrolling` whenever a built-in drag operation has been enabled which is known to be non-functional if touch scrolling is enabled. Default behavior is to leave touch scrolling enabled even if it makes other enabled drag operations non-functional, since any `accessible` application must provide an alternative way to perform drag and drop operations anyway.

    `disableTouchScrollingForDrag` exists so that applications can change the default setting on a per-component basis (via `setDefaultProperties`), in order to make a system-wide or per-component-type decision about whether to favor touch scrolling vs retaining the ability to drag and drop via finger drags, instead of having to set `useTouchScrolling` on each individual instance.

    See the `Mobile Development overview` for more background information.

    Parameters:
      `disableTouchScrollingForDrag` - New disableTouchScrollingForDrag value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Scrolling overview and related methods`

  - ### getDisableTouchScrollingForDrag

    public Boolean getDisableTouchScrollingForDrag()
    Disables `useTouchScrolling` whenever a built-in drag operation has been enabled which is known to be non-functional if touch scrolling is enabled. Default behavior is to leave touch scrolling enabled even if it makes other enabled drag operations non-functional, since any `accessible` application must provide an alternative way to perform drag and drop operations anyway.

    `disableTouchScrollingForDrag` exists so that applications can change the default setting on a per-component basis (via `setDefaultProperties`), in order to make a system-wide or per-component-type decision about whether to favor touch scrolling vs retaining the ability to drag and drop via finger drags, instead of having to set `useTouchScrolling` on each individual instance.

    See the `Mobile Development overview` for more background information.

    Returns:
      Current disableTouchScrollingForDrag value. Default value is null
    See Also:
      - `Scrolling overview and related methods`

  - ### setDoubleClickDelay

    public Canvas setDoubleClickDelay(int doubleClickDelay)
    Amount of time (in milliseconds) between which two clicks are considered a single click

    Note : This is an advanced setting

    Parameters:
      `doubleClickDelay` - New doubleClickDelay value. Default value is 250
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getDoubleClickDelay

    public int getDoubleClickDelay()
    Amount of time (in milliseconds) between which two clicks are considered a single click
    Returns:
      Current doubleClickDelay value. Default value is 250

  - ### setDragAppearance

    public Canvas setDragAppearance(DragAppearance dragAppearance)
    Visual appearance to show when the object is being dragged. May be overridden for dragResize or dragReposition events via `dragResizeAppearance` and `dragRepositionAppearance`.

    Note : This is an advanced setting

    Parameters:
      `dragAppearance` - New dragAppearance value. Default value is EventHandler.OUTLINE
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`

  - ### getDragAppearance

    public DragAppearance getDragAppearance()
    Visual appearance to show when the object is being dragged. May be overridden for dragResize or dragReposition events via `dragResizeAppearance` and `dragRepositionAppearance`.
    Returns:
      Current dragAppearance value. Default value is EventHandler.OUTLINE
    See Also:
      - `Drag and Drop`

  - ### setDragIntersectStyle

    public Canvas setDragIntersectStyle(DragIntersectStyle dragIntersectStyle)
    This indicates how the system will test for droppable targets: either by intersection with the mouse or intersection with the rectangle of the dragMoveTarget.

    Note : This is an advanced setting

    Parameters:
      `dragIntersectStyle` - New dragIntersectStyle value. Default value is "mouse"
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`

  - ### getDragIntersectStyle

    public DragIntersectStyle getDragIntersectStyle()
    This indicates how the system will test for droppable targets: either by intersection with the mouse or intersection with the rectangle of the dragMoveTarget.
    Returns:
      Current dragIntersectStyle value. Default value is "mouse"
    See Also:
      - `Drag and Drop`

  - ### setDragMaskType

    public Canvas setDragMaskType(DragMaskType dragMaskType)
    This property controls what kind of mask is used in case `useDragMask` is enabled.
    Parameters:
      `dragMaskType` - New dragMaskType value. Default value is "div"
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`

  - ### getDragMaskType

    public DragMaskType getDragMaskType()
    This property controls what kind of mask is used in case `useDragMask` is enabled.
    Returns:
      Current dragMaskType value. Default value is "div"
    See Also:
      - `Drag and Drop`

  - ### setDragMaxHeight

    public Canvas setDragMaxHeight(int dragMaxHeight)
    Sets maximum height that this Canvas can be resized to by a user. Actual limit will be minimum of `dragMaxHeight` and `maxHeight`.

    Note : This is an advanced setting

    Parameters:
      `dragMaxHeight` - New dragMaxHeight value. Default value is 10000
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Sizing overview and related methods`

  - ### getDragMaxHeight

    public int getDragMaxHeight()
    Sets maximum height that this Canvas can be resized to by a user. Actual limit will be minimum of `dragMaxHeight` and `maxHeight`.
    Returns:
      Current dragMaxHeight value. Default value is 10000
    See Also:
      - `Sizing overview and related methods`

  - ### setDragMaxWidth

    public Canvas setDragMaxWidth(int dragMaxWidth)
    Maximum width that this Canvas can be resized to by a user. Actual limit will be minimum of `dragMaxWidth` and `maxWidth`.

    Note : This is an advanced setting

    Parameters:
      `dragMaxWidth` - New dragMaxWidth value. Default value is 10000
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Sizing overview and related methods`

  - ### getDragMaxWidth

    public int getDragMaxWidth()
    Maximum width that this Canvas can be resized to by a user. Actual limit will be minimum of `dragMaxWidth` and `maxWidth`.
    Returns:
      Current dragMaxWidth value. Default value is 10000
    See Also:
      - `Sizing overview and related methods`

  - ### setDragMinHeight

    public Canvas setDragMinHeight(int dragMinHeight)
    Minimum height that this Canvas can be resized to by a user. See `dragMinWidth` for details of behavior.

    Note : This is an advanced setting

    Parameters:
      `dragMinHeight` - New dragMinHeight value. Default value is 10
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setMinHeight(int)`
      - `Sizing overview and related methods`

  - ### getDragMinHeight

    public int getDragMinHeight()
    Minimum height that this Canvas can be resized to by a user. See `dragMinWidth` for details of behavior.
    Returns:
      Current dragMinHeight value. Default value is 10
    See Also:
      - `getMinHeight()`
      - `Sizing overview and related methods`

  - ### setDragMinWidth

    public Canvas setDragMinWidth(int dragMinWidth)
    Minimum width that this Canvas can be resized to by a user. Actual limit will be maximum of `dragMinWidth` and `minWidth`.

    Note that a Canvas with overflow:"visible" has an implicit minimize size based on it's contents.

    Note that `dragMinWidth` affects only user-initiated drag resizes. To set the minimum width of a Canvas embedded in a Layout, you can set +{minWidth}, or `Layout.minMemberLength` to constrain the minimum size along the length axis of all members of the `Layout`.

    Note : This is an advanced setting

    Parameters:
      `dragMinWidth` - New dragMinWidth value. Default value is 10
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Sizing overview and related methods`

  - ### getDragMinWidth

    public int getDragMinWidth()
    Minimum width that this Canvas can be resized to by a user. Actual limit will be maximum of `dragMinWidth` and `minWidth`.

    Note that a Canvas with overflow:"visible" has an implicit minimize size based on it's contents.

    Note that `dragMinWidth` affects only user-initiated drag resizes. To set the minimum width of a Canvas embedded in a Layout, you can set +{minWidth}, or `Layout.minMemberLength` to constrain the minimum size along the length axis of all members of the `Layout`.

    Returns:
      Current dragMinWidth value. Default value is 10
    See Also:
      - `Sizing overview and related methods`

  - ### setDragOpacity

    public Canvas setDragOpacity(Integer dragOpacity)
    If this widget has dragAppearance `"target"`, this value specifies the opacity to render the target while it is being dragged. A null value implies we do not modify the opacity.

    Note : This is an advanced setting

    Parameters:
      `dragOpacity` - New dragOpacity value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`
      - Drag effects Example

  - ### getDragOpacity

    public Integer getDragOpacity()
    If this widget has dragAppearance `"target"`, this value specifies the opacity to render the target while it is being dragged. A null value implies we do not modify the opacity.
    Returns:
      Current dragOpacity value. Default value is null
    See Also:
      - `Drag and Drop`
      - Drag effects Example

  - ### setDragRepositionAppearance

    public Canvas setDragRepositionAppearance(DragAppearance dragRepositionAppearance)
    If `canDragReposition` is true, this attribute specifies the visual appearance to show during drag reposition. If unset `dragAppearance` will be used.

    Note : This is an advanced setting

    Parameters:
      `dragRepositionAppearance` - New dragRepositionAppearance value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`

  - ### getDragRepositionAppearance

    public DragAppearance getDragRepositionAppearance()
    If `canDragReposition` is true, this attribute specifies the visual appearance to show during drag reposition. If unset `dragAppearance` will be used.
    Returns:
      Current dragRepositionAppearance value. Default value is null
    See Also:
      - `Drag and Drop`

  - ### setDragRepositionCursor

    public Canvas setDragRepositionCursor(Cursor dragRepositionCursor)
    Cursor to switch to if the mouse is over a widget that is drag repositionable.

    Note : This is an advanced setting

    Parameters:
      `dragRepositionCursor` - New dragRepositionCursor value. Default value is Canvas.MOVE
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`

  - ### getDragRepositionCursor

    public Cursor getDragRepositionCursor()
    Cursor to switch to if the mouse is over a widget that is drag repositionable.
    Returns:
      Current dragRepositionCursor value. Default value is Canvas.MOVE
    See Also:
      - `Drag and Drop`

  - ### setDragResizeAppearance

    public Canvas setDragResizeAppearance(DragAppearance dragResizeAppearance)
    If `canDragResize` is true, this attribute specifies the visual appearance to show during drag resize. If unset `dragAppearance` will be used.

    Note : This is an advanced setting

    Parameters:
      `dragResizeAppearance` - New dragResizeAppearance value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`

  - ### getDragResizeAppearance

    public DragAppearance getDragResizeAppearance()
    If `canDragResize` is true, this attribute specifies the visual appearance to show during drag resize. If unset `dragAppearance` will be used.
    Returns:
      Current dragResizeAppearance value. Default value is null
    See Also:
      - `Drag and Drop`

  - ### setDragScrollDelay

    public Canvas setDragScrollDelay(int dragScrollDelay)
    If this widget supports drag-scrolling, This property specifies how many ms the user must hover over the drag-scroll threshold before scrolling begins.

    Note : This is an advanced setting

    Parameters:
      `dragScrollDelay` - New dragScrollDelay value. Default value is 100
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getDragScrollDelay

    public int getDragScrollDelay()
    If this widget supports drag-scrolling, This property specifies how many ms the user must hover over the drag-scroll threshold before scrolling begins.
    Returns:
      Current dragScrollDelay value. Default value is 100

  - ### setDragStartDistance

    public Canvas setDragStartDistance(int dragStartDistance)
    Number of pixels the cursor needs to move before the EventHandler starts a drag operation.

    Note : This is an advanced setting

    Parameters:
      `dragStartDistance` - New dragStartDistance value. Default value is 5
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`

  - ### getDragStartDistance

    public int getDragStartDistance()
    Number of pixels the cursor needs to move before the EventHandler starts a drag operation.
    Returns:
      Current dragStartDistance value. Default value is 5
    See Also:
      - `Drag and Drop`

  - ### setDragTarget

    public Canvas setDragTarget(Canvas dragTarget)
    A different widget that should be actually dragged when dragging initiates on this widget. One example of this is to have a child widget that drags its parent, as with a drag box. Because the parent automatically repositions its children, setting the drag target of the child to the parent and then dragging the child will result in both widgets being moved.

    Valid `dragTarget` values are:

    - `null` (default) [this widget is its own drag target]
    - another widget, or widget ID
    - `"parent"` drag target is this widget's `parentCanvas`
    - `"top"` drag target is this widget's `topElement`

    Note that for dragging to work as intended, the `resizeFrom` setting on the `dragTarget` must be null or a superset of the `resizeFrom` on this canvas.

    Note : This is an advanced setting

    Parameters:
      `dragTarget` - New dragTarget value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `EventHandler.getDragTarget()`
      - `Drag and Drop`

  - ### getDragTarget

    public Canvas getDragTarget()
    A different widget that should be actually dragged when dragging initiates on this widget. One example of this is to have a child widget that drags its parent, as with a drag box. Because the parent automatically repositions its children, setting the drag target of the child to the parent and then dragging the child will result in both widgets being moved.

    Valid `dragTarget` values are:

    - `null` (default) [this widget is its own drag target]
    - another widget, or widget ID
    - `"parent"` drag target is this widget's `parentCanvas`
    - `"top"` drag target is this widget's `topElement`

    Note that for dragging to work as intended, the `resizeFrom` setting on the `dragTarget` must be null or a superset of the `resizeFrom` on this canvas.

    Returns:
      Current dragTarget value. Default value is null
    See Also:
      - `EventHandler.getDragTarget()`
      - `Drag and Drop`

  - ### setDragTarget

    public Canvas setDragTarget(String dragTarget)
    A different widget that should be actually dragged when dragging initiates on this widget. One example of this is to have a child widget that drags its parent, as with a drag box. Because the parent automatically repositions its children, setting the drag target of the child to the parent and then dragging the child will result in both widgets being moved.

    Valid `dragTarget` values are:

    - `null` (default) [this widget is its own drag target]
    - another widget, or widget ID
    - `"parent"` drag target is this widget's `parentCanvas`
    - `"top"` drag target is this widget's `topElement`

    Note that for dragging to work as intended, the `resizeFrom` setting on the `dragTarget` must be null or a superset of the `resizeFrom` on this canvas.

    Note : This is an advanced setting

    Parameters:
      `dragTarget` - New dragTarget value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `EventHandler.getDragTarget()`
      - `Drag and Drop`

  - ### getDragTargetAsString

    public String getDragTargetAsString()
    A different widget that should be actually dragged when dragging initiates on this widget. One example of this is to have a child widget that drags its parent, as with a drag box. Because the parent automatically repositions its children, setting the drag target of the child to the parent and then dragging the child will result in both widgets being moved.

    Valid `dragTarget` values are:

    - `null` (default) [this widget is its own drag target]
    - another widget, or widget ID
    - `"parent"` drag target is this widget's `parentCanvas`
    - `"top"` drag target is this widget's `topElement`

    Note that for dragging to work as intended, the `resizeFrom` setting on the `dragTarget` must be null or a superset of the `resizeFrom` on this canvas.

    Returns:
      Current dragTarget value. Default value is null
    See Also:
      - `EventHandler.getDragTarget()`
      - `Drag and Drop`

  - ### setDragType

    public Canvas setDragType(String dragType)
    Sets a `dragType` for this widget used, to be compared to `dropTypes` on possible drop target widgets. See `dropTypes` for a full explanation.

    Note : This is an advanced setting

    Parameters:
      `dragType` - New dragType value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`

  - ### getDragType

    public String getDragType()
    Sets a `dragType` for this widget used, to be compared to `dropTypes` on possible drop target widgets. See `dropTypes` for a full explanation.
    Returns:
      Current dragType value. Default value is null
    See Also:
      - `Drag and Drop`

  - ### setDropTarget

    public Canvas setDropTarget(Canvas dropTarget)
    Delegates a different widget that should actually be dropped on if the cursor is over this widget when the drop completes. If you're building your own "drop indicator" widget, it may need this property set to the main canvas (receiving the drop) to avoid itself being considered a drop target (causing the indicator to flicker).

    Note : This is an advanced setting

    Parameters:
      `dropTarget` - New dropTarget value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `EventHandler.getDragTarget()`
      - `setDragTarget(com.smartgwt.client.widgets.Canvas)`
      - `Drag and Drop`

  - ### getDropTarget

    public Canvas getDropTarget()
    Delegates a different widget that should actually be dropped on if the cursor is over this widget when the drop completes. If you're building your own "drop indicator" widget, it may need this property set to the main canvas (receiving the drop) to avoid itself being considered a drop target (causing the indicator to flicker).
    Returns:
      Current dropTarget value. Default value is null
    See Also:
      - `EventHandler.getDragTarget()`
      - `getDragTarget()`
      - `Drag and Drop`

  - ### setDropTarget

    public Canvas setDropTarget(String dropTarget)
    Delegates a different widget that should actually be dropped on if the cursor is over this widget when the drop completes. If you're building your own "drop indicator" widget, it may need this property set to the main canvas (receiving the drop) to avoid itself being considered a drop target (causing the indicator to flicker).

    Note : This is an advanced setting

    Parameters:
      `dropTarget` - New dropTarget value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `EventHandler.getDragTarget()`
      - `setDragTarget(com.smartgwt.client.widgets.Canvas)`
      - `Drag and Drop`

  - ### getDropTargetAsString

    public String getDropTargetAsString()
    Delegates a different widget that should actually be dropped on if the cursor is over this widget when the drop completes. If you're building your own "drop indicator" widget, it may need this property set to the main canvas (receiving the drop) to avoid itself being considered a drop target (causing the indicator to flicker).
    Returns:
      Current dropTarget value. Default value is null
    See Also:
      - `EventHandler.getDragTarget()`
      - `getDragTarget()`
      - `Drag and Drop`

  - ### setDropTypes

    public Canvas setDropTypes(String... dropTypes)
    When a drag and drop interaction occurs, if a `dragType` is configured on the source widget, it is compared to the `dropTypes` configured on the target widget, and a drop is only allowed if the `dragType` is listed in the target widget's `dropTypes` array.

    The default setting means any `dragType` is eligible for dropping on this widget, including no `dragType` setting.

    See also `willAcceptDrop()` for dynamic determination of drop eligibility.

    Note : This is an advanced setting

    Parameters:
      `dropTypes` - New dropTypes value. Default value is Canvas.ANYTHING
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`

  - ### getDropTypes

    public String[] getDropTypes()
    When a drag and drop interaction occurs, if a `dragType` is configured on the source widget, it is compared to the `dropTypes` configured on the target widget, and a drop is only allowed if the `dragType` is listed in the target widget's `dropTypes` array.

    The default setting means any `dragType` is eligible for dropping on this widget, including no `dragType` setting.

    See also `willAcceptDrop()` for dynamic determination of drop eligibility.

    Returns:
      Current dropTypes value. Default value is Canvas.ANYTHING
    See Also:
      - `Drag and Drop`

  - ### setDropTypes

    public Canvas setDropTypes(String dropTypes)
    When a drag and drop interaction occurs, if a `dragType` is configured on the source widget, it is compared to the `dropTypes` configured on the target widget, and a drop is only allowed if the `dragType` is listed in the target widget's `dropTypes` array.

    The default setting means any `dragType` is eligible for dropping on this widget, including no `dragType` setting.

    See also `willAcceptDrop()` for dynamic determination of drop eligibility.

    Note : This is an advanced setting

    Parameters:
      `dropTypes` - New dropTypes value. Default value is Canvas.ANYTHING
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`

  - ### getDropTypesAsString

    public String getDropTypesAsString()
    When a drag and drop interaction occurs, if a `dragType` is configured on the source widget, it is compared to the `dropTypes` configured on the target widget, and a drop is only allowed if the `dragType` is listed in the target widget's `dropTypes` array.

    The default setting means any `dragType` is eligible for dropping on this widget, including no `dragType` setting.

    See also `willAcceptDrop()` for dynamic determination of drop eligibility.

    Returns:
      Current dropTypes value. Default value is Canvas.ANYTHING
    See Also:
      - `Drag and Drop`

  - ### setDynamicContents

    public Canvas setDynamicContents(Boolean dynamicContents)
    Dynamic contents allows the contents string to be treated as a simple but powerful template. When this attribute is set to `true`, JavaScript expressions may be embedded within the contents string, using the format:
    `${[JavaScript to evaluate]}`.

    For example, to include the current date in a templated message, `canvas.contents` could be set to:
    `"Today's date is <b>${new Date().toUSShortDate()}</b>"`

    Embedded expressions will be evaluated when the canvas is drawn or redrawn, and the result of the evaluated expression will be displayed to the user. If the expression does not evaluate to a String, the `toString()` representation of the returned object will be displayed automatically

    Dynamic expressions are evaluated in the scope of the canvas displaying the content, so the `this` keyword may be used within your expression to refer to the canvas. Developers may also explicitly supply values for variables to be used within the evaluation via the `dynamicContentsVars` property.

    Notes:

    - Calling markForRedraw() on the canvas will evaluate any embedded expressions.
    - Multiple such expressions may be embedded within the contents string for a component.
    - If an error occurs during evaluation, a warning is logged to the `Developer Console` and an empty string will be substituted.

    Note : This is an advanced setting

    Parameters:
      `dynamicContents` - New dynamicContents value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setContents(java.lang.String)`
      - `com.smartgwt.client.widgets.Canvas#setDynamicContentsVars`
      - `Dynamic Strings`

  - ### getDynamicContents

    public Boolean getDynamicContents()
    Dynamic contents allows the contents string to be treated as a simple but powerful template. When this attribute is set to `true`, JavaScript expressions may be embedded within the contents string, using the format:
    `${[JavaScript to evaluate]}`.

    For example, to include the current date in a templated message, `canvas.contents` could be set to:
    `"Today's date is <b>${new Date().toUSShortDate()}</b>"`

    Embedded expressions will be evaluated when the canvas is drawn or redrawn, and the result of the evaluated expression will be displayed to the user. If the expression does not evaluate to a String, the `toString()` representation of the returned object will be displayed automatically

    Dynamic expressions are evaluated in the scope of the canvas displaying the content, so the `this` keyword may be used within your expression to refer to the canvas. Developers may also explicitly supply values for variables to be used within the evaluation via the `dynamicContentsVars` property.

    Notes:

    - Calling markForRedraw() on the canvas will evaluate any embedded expressions.
    - Multiple such expressions may be embedded within the contents string for a component.
    - If an error occurs during evaluation, a warning is logged to the `Developer Console` and an empty string will be substituted.
    Returns:
      Current dynamicContents value. Default value is false
    See Also:
      - `getContents()`
      - `com.smartgwt.client.widgets.Canvas#getDynamicContentsVars`
      - `Dynamic Strings`

  - ### setEdgeBackgroundColor

    public Canvas setEdgeBackgroundColor(String edgeBackgroundColor) throws IllegalStateException
    Background color for the EdgedCanvas created to decorate this component. This can be used to provide an underlying "tint" color for translucent edge media
    Parameters:
      `edgeBackgroundColor` - New edgeBackgroundColor value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `CSSColor`

  - ### getEdgeBackgroundColor

    public String getEdgeBackgroundColor()
    Background color for the EdgedCanvas created to decorate this component. This can be used to provide an underlying "tint" color for translucent edge media
    Returns:
      Current edgeBackgroundColor value. Default value is null
    See Also:
      - `CSSColor`

  - ### setEdgeCenterBackgroundColor

    public Canvas setEdgeCenterBackgroundColor(String edgeCenterBackgroundColor) throws IllegalStateException
    Background color for the center section only. Can be used as a surrogate background color for the decorated Canvas, if the Canvas is set to partially overlap the edges and hence can't show a background color itself without occluding media.
    Parameters:
      `edgeCenterBackgroundColor` - New edgeCenterBackgroundColor value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `CSSColor`

  - ### getEdgeCenterBackgroundColor

    public String getEdgeCenterBackgroundColor()
    Background color for the center section only. Can be used as a surrogate background color for the decorated Canvas, if the Canvas is set to partially overlap the edges and hence can't show a background color itself without occluding media.
    Returns:
      Current edgeCenterBackgroundColor value. Default value is null
    See Also:
      - `CSSColor`

  - ### setEdgeImage

    public Canvas setEdgeImage(String edgeImage) throws IllegalStateException
    Base name of images for edges. Extensions for each corner or edge piece will be added to this image URL, before the extension. For example, with the default base name of "edge.gif", the top-left corner image will be "edge_TL.gif".

    The full list of extensions is: "_TL", "_TR", "_BL", "_BR", "_T", "_L", "_B", "_R", "_center".

    Parameters:
      `edgeImage` - New edgeImage value. Default value is "[SKIN]edge.gif"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `SCImgURL`
      - Edges Example

  - ### getEdgeImage

    public String getEdgeImage()
    Base name of images for edges. Extensions for each corner or edge piece will be added to this image URL, before the extension. For example, with the default base name of "edge.gif", the top-left corner image will be "edge_TL.gif".

    The full list of extensions is: "_TL", "_TR", "_BL", "_BR", "_T", "_L", "_B", "_R", "_center".

    Returns:
      Current edgeImage value. Default value is "[SKIN]edge.gif"
    See Also:
      - `SCImgURL`
      - Edges Example

  - ### setEdgeMarginSize

    public Canvas setEdgeMarginSize(int edgeMarginSize)
    How far into the edge of an object do we consider the "edge" for drag resize purposes?

    Note : This is an advanced setting

    Parameters:
      `edgeMarginSize` - New edgeMarginSize value. Default value is 5
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`
      - Drag resize Example

  - ### getEdgeMarginSize

    public int getEdgeMarginSize()
    How far into the edge of an object do we consider the "edge" for drag resize purposes?
    Returns:
      Current edgeMarginSize value. Default value is 5
    See Also:
      - `Drag and Drop`
      - Drag resize Example

  - ### setEdgeOffset

    public Canvas setEdgeOffset(Integer edgeOffset) throws IllegalStateException
    Amount the contained Canvas should be offset. Defaults to edgeSize; set to less than edgeSize to allow the contained Canvas to overlap the edge and corner media.
    Parameters:
      `edgeOffset` - New edgeOffset value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - Corners Example

  - ### getEdgeOffset

    public Integer getEdgeOffset()
    Amount the contained Canvas should be offset. Defaults to edgeSize; set to less than edgeSize to allow the contained Canvas to overlap the edge and corner media.
    Returns:
      Current edgeOffset value. Default value is null
    See Also:
      - Corners Example

  - ### setEdgeOpacity

    public Canvas setEdgeOpacity(Integer edgeOpacity) throws IllegalStateException
    Opacity of the edges. Defaults to matching this.opacity. if `setOpacity()` is called on a Canvas where edgeOpacity is set, edgeOpacity will be considered a percentage of the parent's opacity (so 50% opaque parent plus edgeOpacity 50 means 25% opaque edges)
    If this method is called after the component has been drawn/initialized: Set the `edgeOpacity` and mark the canvas for redraw
    Parameters:
      `edgeOpacity` - new edge-opacity level. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - Edges Example

  - ### getEdgeOpacity

    public Integer getEdgeOpacity()
    Opacity of the edges. Defaults to matching this.opacity. if `setOpacity()` is called on a Canvas where edgeOpacity is set, edgeOpacity will be considered a percentage of the parent's opacity (so 50% opaque parent plus edgeOpacity 50 means 25% opaque edges)
    Returns:
      Current edgeOpacity value. Default value is null
    See Also:
      - Edges Example

  - ### setEdgeShowCenter

    public Canvas setEdgeShowCenter(Boolean edgeShowCenter) throws IllegalStateException
    Whether to show media in the center section, that is, behind the decorated Canvas.
    Parameters:
      `edgeShowCenter` - New edgeShowCenter value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - Corners Example

  - ### getEdgeShowCenter

    public Boolean getEdgeShowCenter()
    Whether to show media in the center section, that is, behind the decorated Canvas.
    Returns:
      Current edgeShowCenter value. Default value is false
    See Also:
      - Corners Example

  - ### setEdgeSize

    public Canvas setEdgeSize(int edgeSize) throws IllegalStateException
    Size in pixels for corners and edges
    Parameters:
      `edgeSize` - New edgeSize value. Default value is 10
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - Edges Example

  - ### getEdgeSize

    public int getEdgeSize()
    Size in pixels for corners and edges
    Returns:
      Current edgeSize value. Default value is 10
    See Also:
      - Edges Example

  - ### getEditNode

    public EditNode getEditNode() throws IllegalStateException
    The component's `EditNode` for a component that has been created by a `Palette` from a `PaletteNode`.

    Note : This method should be called only after the widget has been rendered.

    Returns:
      Current editNode value. Default value is null
    Throws:
      `IllegalStateException` - if this widget has not yet been rendered.

  - ### getEditProxy

    public EditProxy getEditProxy() throws IllegalStateException
    An `EditProxy` controls the behaviors of a component when it is placed into `editing mode`.

    The `editProxy` AutoChild is created when a component is first placed into edit mode via `setEditMode()`.

    `editProxy` properties can be supplied on a `PaletteNode` or `EditNode` as `editProxyProperties`, but must be provided before the component is first placed into edit mode.

    Most editable components use a custom EditProxy. See the documentation for each class' `editProxyConstructor` to determine the class.

    This component is an AutoChild named "editProxy". For an overview of how to use and configure AutoChildren, see `Using AutoChildren`.

    Returns:
      Current editProxy value. Default value is null
    Throws:
      `IllegalStateException` - if this widget has not yet been rendered.
    See Also:
      - `setEditMode(boolean)`

  - ### setEditProxyConstructor

    public Canvas setEditProxyConstructor(String editProxyConstructor) throws IllegalStateException
    Default class used to construct the `EditProxy` for this component when the component is `first placed into edit mode`.
    Parameters:
      `editProxyConstructor` - New editProxyConstructor value. Default value is "CanvasEditProxy"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `SCClassName`

  - ### getEditProxyConstructor

    public String getEditProxyConstructor()
    Default class used to construct the `EditProxy` for this component when the component is `first placed into edit mode`.
    Returns:
      Current editProxyConstructor value. Default value is "CanvasEditProxy"
    See Also:
      - `SCClassName`

  - ### setEnableWhen

    public Canvas setEnableWhen(AdvancedCriteria enableWhen) throws IllegalStateException
    Criteria to be evaluated to determine whether this Canvas should be enabled. Re-evaluated whenever data in the `ruleScope` changes.

    A basic criteria uses textMatchStyle:"exact". When specified in `Component XML` this property allows `shorthand formats` for defining criteria.

    Parameters:
      `enableWhen` - New enableWhen value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Dynamic Rules`

  - ### getEnableWhen

    public AdvancedCriteria getEnableWhen()
    Criteria to be evaluated to determine whether this Canvas should be enabled. Re-evaluated whenever data in the `ruleScope` changes.

    A basic criteria uses textMatchStyle:"exact". When specified in `Component XML` this property allows `shorthand formats` for defining criteria.

    Returns:
      Current enableWhen value. Default value is null
    See Also:
      - `Dynamic Rules`

  - ### setEndLine

    public Canvas setEndLine(Boolean endLine)
    Whether this canvas should end the line it's in when used as a tile in a `FlowLayout`. This property is not supported in a `TileLayout` with `TileLayout.layoutPolicy`: "fit" or if databound (i.e.`TileGrid`).
    Parameters:
      `endLine` - New endLine value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `TileLayout.setAutoWrapLines(java.lang.Boolean)`

  - ### getEndLine

    public Boolean getEndLine()
    Whether this canvas should end the line it's in when used as a tile in a `FlowLayout`. This property is not supported in a `TileLayout` with `TileLayout.layoutPolicy`: "fit" or if databound (i.e.`TileGrid`).
    Returns:
      Current endLine value. Default value is false
    See Also:
      - `TileLayout.getAutoWrapLines()`

  - ### setExtraSpace

    public Canvas setExtraSpace(int extraSpace) throws IllegalStateException
    When this Canvas is included as a member in a Layout, extra blank space that should be left after this member in a Layout.
    Parameters:
      `extraSpace` - New extraSpace value. Default value is 0
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `LayoutSpacer`
      - `LayoutMember overview and related methods`

  - ### getExtraSpace

    public int getExtraSpace()
    When this Canvas is included as a member in a Layout, extra blank space that should be left after this member in a Layout.
    Returns:
      Current extraSpace value. Default value is 0
    See Also:
      - `LayoutSpacer`
      - `LayoutMember overview and related methods`

  - ### setFloatingScrollbars

    public Canvas setFloatingScrollbars(boolean floatingScrollbars) throws IllegalStateException
    If `showCustomScrollbars` is true, should the scrollbars be drawn floating over the component handle, or should the handle shrink to accommodate them?

    Floating scrollbars are typically only appropriate for scrollbars that are hidden by default and get shown as the user actively scrolls the widget handle, such as in the `nativeAutoHideScrollbars` case. If floating scrollbars are permanently visible over the component handle, they may block some of the widget's content.

    Note : This is an advanced setting

    Parameters:
      `floatingScrollbars` - New floatingScrollbars value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getFloatingScrollbars

    public boolean getFloatingScrollbars()
    If `showCustomScrollbars` is true, should the scrollbars be drawn floating over the component handle, or should the handle shrink to accommodate them?

    Floating scrollbars are typically only appropriate for scrollbars that are hidden by default and get shown as the user actively scrolls the widget handle, such as in the `nativeAutoHideScrollbars` case. If floating scrollbars are permanently visible over the component handle, they may block some of the widget's content.

    Returns:
      Current floatingScrollbars value. Default value is false

  - ### setForwardSVGeventsToObject

    public Canvas setForwardSVGeventsToObject(Boolean forwardSVGeventsToObject) throws IllegalStateException
    If true, events sent to the SVG inside an object tag are forwarded to the object itself by Framework handlers. If false, "pointer-events:none" CSS is set on the object so that events are directly sent to the object by the browser, if supported.

    The advantage of forwarding events is that it allows hover CSS or any other event-driven logic on the SVG to work as expected. If "pointer-events:none" is written out, no GUI interaction will trigger events in the SVG, including hover CSS. The disadvantage is that only a few critical events are forwarded, such as "mouseDown", "mouseMove", and "mouseUp" for non-touch platforms, and "click" for touch platforms. Other events will be delivered to the SVG, but not forwarded up to the parent document/object tag.

    Note : This is an advanced setting

    Parameters:
      `forwardSVGeventsToObject` - New forwardSVGeventsToObject value. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `EventHandler`
      - `setUseImageForSVG(boolean)`
      - `Images overview and related methods`

  - ### getForwardSVGeventsToObject

    public Boolean getForwardSVGeventsToObject()
    If true, events sent to the SVG inside an object tag are forwarded to the object itself by Framework handlers. If false, "pointer-events:none" CSS is set on the object so that events are directly sent to the object by the browser, if supported.

    The advantage of forwarding events is that it allows hover CSS or any other event-driven logic on the SVG to work as expected. If "pointer-events:none" is written out, no GUI interaction will trigger events in the SVG, including hover CSS. The disadvantage is that only a few critical events are forwarded, such as "mouseDown", "mouseMove", and "mouseUp" for non-touch platforms, and "click" for touch platforms. Other events will be delivered to the SVG, but not forwarded up to the parent document/object tag.

    Returns:
      Current forwardSVGeventsToObject value. Default value is true
    See Also:
      - `EventHandler`
      - `getUseImageForSVG()`
      - `Images overview and related methods`

  - ### setGroupBorderCSS

    public Canvas setGroupBorderCSS(String groupBorderCSS) throws IllegalStateException
    Sets the style for the grouping frame around the canvas. Only necessary when showing a `grouping frame`.
    Parameters:
      `groupBorderCSS` - New groupBorderCSS value. Default value is "2px solid black"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Appearance overview and related methods`

  - ### getGroupBorderCSS

    public String getGroupBorderCSS()
    Sets the style for the grouping frame around the canvas. Only necessary when showing a `grouping frame`.
    Returns:
      Current groupBorderCSS value. Default value is "2px solid black"
    See Also:
      - `Appearance overview and related methods`

  - ### setGroupLabelBackgroundColor

    public Canvas setGroupLabelBackgroundColor(String groupLabelBackgroundColor)
    If set, the background color of the grouping label. Only applicable when showing a `grouping frame`.

    This corresponds to the CSS background-color property on the grouping label. You can set this property to an RGB value (e.g. #22AAFF) or a named color (e.g. red) from a list of browser supported color names.

    The getter for this attribute, `getGroupLabelBackgroundColor()`, returns the color that will actually be used; i.e. if groupLabelBackgroundColor is left unset or is set to null, then getGroupLabelBackgroundColor() returns the color string that will be used.
    If this method is called after the component has been drawn/initialized: Setter for `groupLabelBackgroundColor`.

    Parameters:
      `groupLabelBackgroundColor` - the new grouping label background color. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `CSSColor`
      - `Appearance overview and related methods`

  - ### getGroupLabelBackgroundColor

    public String getGroupLabelBackgroundColor()
    If set, the background color of the grouping label. Only applicable when showing a `grouping frame`.

    This corresponds to the CSS background-color property on the grouping label. You can set this property to an RGB value (e.g. #22AAFF) or a named color (e.g. red) from a list of browser supported color names.

    The getter for this attribute, `getGroupLabelBackgroundColor()`, returns the color that will actually be used; i.e. if groupLabelBackgroundColor is left unset or is set to null, then getGroupLabelBackgroundColor() returns the color string that will be used.

    Returns:
      Current groupLabelBackgroundColor value. Default value is null
    See Also:
      - `CSSColor`
      - `Appearance overview and related methods`

  - ### setGroupLabelStyleName

    public Canvas setGroupLabelStyleName(String groupLabelStyleName) throws IllegalStateException
    Sets the style for the grouping label. Only necessary when showing a `grouping frame`.

    Note that `groupLabelBackgroundColor` overrides any background-color of this style.

    Parameters:
      `groupLabelStyleName` - New groupLabelStyleName value. Default value is "groupLabel"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `CSSStyleName`
      - `Appearance overview and related methods`

  - ### getGroupLabelStyleName

    public String getGroupLabelStyleName()
    Sets the style for the grouping label. Only necessary when showing a `grouping frame`.

    Note that `groupLabelBackgroundColor` overrides any background-color of this style.

    Returns:
      Current groupLabelStyleName value. Default value is "groupLabel"
    See Also:
      - `CSSStyleName`
      - `Appearance overview and related methods`

  - ### setGroupPadding

    public Canvas setGroupPadding(Integer groupPadding) throws IllegalStateException
    Padding to apply inside the border when this canvas is showing a group `border and label`.
    Parameters:
      `groupPadding` - New groupPadding value. Default value is 10
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `setIsGroup(boolean)`
      - `Appearance overview and related methods`

  - ### getGroupPadding

    public Integer getGroupPadding()
    Padding to apply inside the border when this canvas is showing a group `border and label`.
    Returns:
      Current groupPadding value. Default value is 10
    See Also:
      - `getIsGroup()`
      - `Appearance overview and related methods`

  - ### setGroupTitle

    public Canvas setGroupTitle(String groupTitle)
    The title/label for the grouping. Only applicable when `isGroup` is set to true. No `grouping frame` or title/label will be shown unless this property is a non-empty string.
    If this method is called after the component has been drawn/initialized: Setter for `groupTitle`.
    Parameters:
      `groupTitle` - The new title for the grouping. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `HTMLString`
      - `Appearance overview and related methods`

  - ### getGroupTitle

    public String getGroupTitle()
    The title/label for the grouping. Only applicable when `isGroup` is set to true. No `grouping frame` or title/label will be shown unless this property is a non-empty string.
    Returns:
      Current groupTitle value. Default value is null
    See Also:
      - `HTMLString`
      - `Appearance overview and related methods`

  - ### setHeight

    public Canvas setHeight(Integer height)
    The `canvas.width` attribute specifies the size for a component's horizontal dimension; `canvas.height` specifies the size for the vertical dimension.

    May be set to an integer value (a number of pixels), a percentage value like "50%", or "*".

    See `PercentSizing` for details on how percentage or `"*"` values are resolved actual size.

    If `overflow` is set to "visible", the specified size acts as a minimum, and the component may overflow to show all content and/or children.

    Note that developers wishing to set a default width or height for a component class should set `defaultWidth` or `defaultHeight` instead of specifying an explicit default `width` or `height`. This is important for components added to a `Layout` as members - it allows the Layout to determine whether the canvas has an explicitly specified size that must be respected, or whether it can participate in its `sizing policies`.
    If this method is called after the component has been drawn/initialized: Resizes the widget vertically to the specified height (moves the bottom side of the widget). The height parameter can be expressed as a percentage of viewport size or as the number of pixels.

    NOTE: if you're setting multiple coordinates, use resizeTo() or setRect() instead

    Parameters:
      `height` - new height. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Sizing overview and related methods`

  - ### getHeight

    public Integer getHeight()
    The `canvas.width` attribute specifies the size for a component's horizontal dimension; `canvas.height` specifies the size for the vertical dimension.

    May be set to an integer value (a number of pixels), a percentage value like "50%", or "*".

    See `PercentSizing` for details on how percentage or `"*"` values are resolved actual size.

    If `overflow` is set to "visible", the specified size acts as a minimum, and the component may overflow to show all content and/or children.

    Note that developers wishing to set a default width or height for a component class should set `defaultWidth` or `defaultHeight` instead of specifying an explicit default `width` or `height`. This is important for components added to a `Layout` as members - it allows the Layout to determine whether the canvas has an explicitly specified size that must be respected, or whether it can participate in its `sizing policies`.

    Returns:
      Return the height of this object, in pixels.

      See `GettingCanvasSize`. Default value is null

    See Also:
      - `Sizing overview and related methods`

  - ### setHeight

    public void setHeight(String height)
    The `canvas.width` attribute specifies the size for a component's horizontal dimension; `canvas.height` specifies the size for the vertical dimension.

    May be set to an integer value (a number of pixels), a percentage value like "50%", or "*".

    See `PercentSizing` for details on how percentage or `"*"` values are resolved actual size.

    If `overflow` is set to "visible", the specified size acts as a minimum, and the component may overflow to show all content and/or children.

    Note that developers wishing to set a default width or height for a component class should set `defaultWidth` or `defaultHeight` instead of specifying an explicit default `width` or `height`. This is important for components added to a `Layout` as members - it allows the Layout to determine whether the canvas has an explicitly specified size that must be respected, or whether it can participate in its `sizing policies`.
    If this method is called after the component has been drawn/initialized: Resizes the widget vertically to the specified height (moves the bottom side of the widget). The height parameter can be expressed as a percentage of viewport size or as the number of pixels.

    NOTE: if you're setting multiple coordinates, use resizeTo() or setRect() instead

    Overrides:
      `setHeight` in class `UIObject`
    Parameters:
      `height` - new height. Default value is null
    See Also:
      - `Sizing overview and related methods`

  - ### setHideUsingDisplayNone

    public Canvas setHideUsingDisplayNone(boolean hideUsingDisplayNone) throws IllegalStateException
    When this widget is hidden (see `visibility` and `hide()`), should display:none be applied to the `outer element`?

    This setting is not supported for general use, but in certain cases, it has been shown that display:none is a work-around for browser bugs involving burn-through of iframes or plugins, where the content of the iframe or plugin may still be visible despite the containing widget being hidden.

    Note : This is an advanced setting

    Parameters:
      `hideUsingDisplayNone` - New hideUsingDisplayNone value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Visibility`
      - `Appearance overview and related methods`

  - ### getHideUsingDisplayNone

    public boolean getHideUsingDisplayNone()
    When this widget is hidden (see `visibility` and `hide()`), should display:none be applied to the `outer element`?

    This setting is not supported for general use, but in certain cases, it has been shown that display:none is a work-around for browser bugs involving burn-through of iframes or plugins, where the content of the iframe or plugin may still be visible despite the containing widget being hidden.

    Returns:
      Current hideUsingDisplayNone value. Default value is false
    See Also:
      - `Visibility`
      - `Appearance overview and related methods`

  - ### setHoverAlign

    public Canvas setHoverAlign(Alignment hoverAlign)
    If `this.showHover` is true, this property can be used to customize the alignment of content in the hover canvas.
    Parameters:
      `hoverAlign` - New hoverAlign value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setShowHover(java.lang.Boolean)`

  - ### getHoverAlign

    public Alignment getHoverAlign()
    If `this.showHover` is true, this property can be used to customize the alignment of content in the hover canvas.
    Returns:
      Current hoverAlign value. Default value is null
    See Also:
      - `getShowHover()`

  - ### setHoverAutoDestroy

    public Canvas setHoverAutoDestroy(Boolean hoverAutoDestroy)
    If `this.showHover` is true and `getHoverComponent()` is implemented, should the hoverCanvas returned from it be automatically destroyed when it is hidden?

    The default of null indicates that the component will be automatically destroyed. Set to false to prevent this.

    Parameters:
      `hoverAutoDestroy` - New hoverAutoDestroy value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setShowHover(java.lang.Boolean)`

  - ### getHoverAutoDestroy

    public Boolean getHoverAutoDestroy()
    If `this.showHover` is true and `getHoverComponent()` is implemented, should the hoverCanvas returned from it be automatically destroyed when it is hidden?

    The default of null indicates that the component will be automatically destroyed. Set to false to prevent this.

    Returns:
      Current hoverAutoDestroy value. Default value is null
    See Also:
      - `getShowHover()`

  - ### setHoverAutoFitMaxWidth

    public Canvas setHoverAutoFitMaxWidth(int hoverAutoFitMaxWidth)
    Maximum auto-fit width for a hover if `hoverAutoFitWidth` is enabled. May be specified as a pixel value, or a percentage of page width.
    Parameters:
      `hoverAutoFitMaxWidth` - New hoverAutoFitMaxWidth value. Default value is 200
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getHoverAutoFitMaxWidth

    public int getHoverAutoFitMaxWidth()
    Maximum auto-fit width for a hover if `hoverAutoFitWidth` is enabled. May be specified as a pixel value, or a percentage of page width.
    Returns:
      Current hoverAutoFitMaxWidth value. Default value is 200

  - ### setHoverAutoFitMaxWidth

    public Canvas setHoverAutoFitMaxWidth(String hoverAutoFitMaxWidth)
    Maximum auto-fit width for a hover if `hoverAutoFitWidth` is enabled. May be specified as a pixel value, or a percentage of page width.
    Parameters:
      `hoverAutoFitMaxWidth` - New hoverAutoFitMaxWidth value. Default value is 200
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getHoverAutoFitMaxWidthAsString

    public String getHoverAutoFitMaxWidthAsString()
    Maximum auto-fit width for a hover if `hoverAutoFitWidth` is enabled. May be specified as a pixel value, or a percentage of page width.
    Returns:
      Current hoverAutoFitMaxWidth value. Default value is 200

  - ### setHoverAutoFitWidth

    public Canvas setHoverAutoFitWidth(Boolean hoverAutoFitWidth)
    if `showHover` is true, this property will cause the specified `hoverWidth` to be treated as a minimum width for the hover. If the hover content string exceeds this, the hover will expand to accommodate it up to `hoverAutoFitMaxWidth` (without the text wrapping).

    Using this settings differs from simply disabling wrapping via `hoverWrap:false` as the content will wrap if the `hoverAutoFitMaxWidth` is exceeded.

    Note : This is an advanced setting

    Parameters:
      `hoverAutoFitWidth` - New hoverAutoFitWidth value. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setShowHover(java.lang.Boolean)`

  - ### getHoverAutoFitWidth

    public Boolean getHoverAutoFitWidth()
    if `showHover` is true, this property will cause the specified `hoverWidth` to be treated as a minimum width for the hover. If the hover content string exceeds this, the hover will expand to accommodate it up to `hoverAutoFitMaxWidth` (without the text wrapping).

    Using this settings differs from simply disabling wrapping via `hoverWrap:false` as the content will wrap if the `hoverAutoFitMaxWidth` is exceeded.

    Returns:
      Current hoverAutoFitWidth value. Default value is true
    See Also:
      - `getShowHover()`

  - ### setHoverDelay

    public Canvas setHoverDelay(int hoverDelay)
    If `this.canHover` is true, how long should the mouse be kept over this widget before the hover event is fired
    Parameters:
      `hoverDelay` - New hoverDelay value. Default value is 300
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setCanHover(java.lang.Boolean)`
      - `HoverEvent`

  - ### getHoverDelay

    public int getHoverDelay()
    If `this.canHover` is true, how long should the mouse be kept over this widget before the hover event is fired
    Returns:
      Current hoverDelay value. Default value is 300
    See Also:
      - `getCanHover()`
      - `HoverEvent`

  - ### setHoverFocusKey

    public Canvas setHoverFocusKey(String hoverFocusKey)
    For canvases `showing a hover`, this attribute gives users a way to pin the hover in place so they can interact with it (scroll it, click embedded links, etc). Clicking outside the hover (on some other component) will still dismiss it.

    When enabled, the standard hover canvas will display the `focusKeyHintLabel` to prompt the user on how to give the hover focus. This behavior may be disabled by setting `showFocusKeyHint` to false

    Note that setting a hoverFocusKey also sets `hoverPersist` to "clickPin". This makes hovers stay visible while the cursor is over them, and become pinned if clicked, the same as pressing the hoverFocusKey.

    Parameters:
      `hoverFocusKey` - New hoverFocusKey value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `KeyName`

  - ### getHoverFocusKey

    public String getHoverFocusKey()
    For canvases `showing a hover`, this attribute gives users a way to pin the hover in place so they can interact with it (scroll it, click embedded links, etc). Clicking outside the hover (on some other component) will still dismiss it.

    When enabled, the standard hover canvas will display the `focusKeyHintLabel` to prompt the user on how to give the hover focus. This behavior may be disabled by setting `showFocusKeyHint` to false

    Note that setting a hoverFocusKey also sets `hoverPersist` to "clickPin". This makes hovers stay visible while the cursor is over them, and become pinned if clicked, the same as pressing the hoverFocusKey.

    Returns:
      Current hoverFocusKey value. Default value is null
    See Also:
      - `KeyName`

  - ### setHoverHeight

    public Canvas setHoverHeight(Integer hoverHeight)
    If `this.showHover` is true, this property can be used to customize the height of the hover canvas shown.
    Parameters:
      `hoverHeight` - New hoverHeight value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setShowHover(java.lang.Boolean)`

  - ### getHoverHeight

    public Integer getHoverHeight()
    If `this.showHover` is true, this property can be used to customize the height of the hover canvas shown.
    Returns:
      Current hoverHeight value. Default value is null
    See Also:
      - `getShowHover()`

  - ### setHoverMoveWithMouse

    public Canvas setHoverMoveWithMouse(Boolean hoverMoveWithMouse)
    If `this.showHover` is true, should this widget's hover canvas be moved with the mouse while visible?
    Parameters:
      `hoverMoveWithMouse` - New hoverMoveWithMouse value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setShowHover(java.lang.Boolean)`

  - ### getHoverMoveWithMouse

    public Boolean getHoverMoveWithMouse()
    If `this.showHover` is true, should this widget's hover canvas be moved with the mouse while visible?
    Returns:
      Current hoverMoveWithMouse value. Default value is null
    See Also:
      - `getShowHover()`

  - ### setHoverOpacity

    public Canvas setHoverOpacity(Integer hoverOpacity)
    If `this.showHover` is true, should the hover canvas be shown with opacity other than 100?
    Parameters:
      `hoverOpacity` - New hoverOpacity value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setShowHover(java.lang.Boolean)`
      - Hovers / Tooltips Example

  - ### getHoverOpacity

    public Integer getHoverOpacity()
    If `this.showHover` is true, should the hover canvas be shown with opacity other than 100?
    Returns:
      Current hoverOpacity value. Default value is null
    See Also:
      - `getShowHover()`
      - Hovers / Tooltips Example

  - ### setHoverPersist

    public Canvas setHoverPersist(HoverPersistMode hoverPersist)
    Allows interaction with hovers when the cursor is positioned over them.
    Parameters:
      `hoverPersist` - New hoverPersist value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `com.smartgwt.client.widgets.Hover#persistent`

  - ### getHoverPersist

    public HoverPersistMode getHoverPersist()
    Allows interaction with hovers when the cursor is positioned over them.
    Returns:
      Current hoverPersist value. Default value is null
    See Also:
      - `com.smartgwt.client.widgets.Hover#persistent`

  - ### setHoverScreen

    public Canvas setHoverScreen(String hoverScreen) throws IllegalStateException
    Screen to create (via `createScreen()`) in lieu of calling `getHoverComponent()`.
    Parameters:
      `hoverScreen` - New hoverScreen value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getHoverScreen

    public String getHoverScreen()
    Screen to create (via `createScreen()`) in lieu of calling `getHoverComponent()`.
    Returns:
      Current hoverScreen value. Default value is null

  - ### setHoverStyle

    public Canvas setHoverStyle(String hoverStyle)
    If `this.showHover` is true, this property can be used to specify the css style to apply to the hover canvas.
    Parameters:
      `hoverStyle` - New hoverStyle value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setShowHover(java.lang.Boolean)`
      - `CSSStyleName`
      - Hovers / Tooltips Example

  - ### getHoverStyle

    public String getHoverStyle()
    If `this.showHover` is true, this property can be used to specify the css style to apply to the hover canvas.
    Returns:
      Current hoverStyle value. Default value is null
    See Also:
      - `getShowHover()`
      - `CSSStyleName`
      - Hovers / Tooltips Example

  - ### setHoverVAlign

    public Canvas setHoverVAlign(VerticalAlignment hoverVAlign)
    If `this.showHover` is true, this property can be used to customize the vertical alignment of content in the hover canvas.
    Parameters:
      `hoverVAlign` - New hoverVAlign value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setShowHover(java.lang.Boolean)`

  - ### getHoverVAlign

    public VerticalAlignment getHoverVAlign()
    If `this.showHover` is true, this property can be used to customize the vertical alignment of content in the hover canvas.
    Returns:
      Current hoverVAlign value. Default value is null
    See Also:
      - `getShowHover()`

  - ### setHoverWidth

    public Canvas setHoverWidth(int hoverWidth)
    If `this.showHover` is true, this property can be used to customize the width of the hover canvas shown. See also `hoverAutoFitWidth` and `hoverAutoFitMaxWidth`.
    Parameters:
      `hoverWidth` - New hoverWidth value. Default value is 1
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setShowHover(java.lang.Boolean)`
      - Hovers / Tooltips Example

  - ### getHoverWidth

    public int getHoverWidth()
    If `this.showHover` is true, this property can be used to customize the width of the hover canvas shown. See also `hoverAutoFitWidth` and `hoverAutoFitMaxWidth`.
    Returns:
      Current hoverWidth value. Default value is 1
    See Also:
      - `getShowHover()`
      - Hovers / Tooltips Example

  - ### setHoverWrap

    public Canvas setHoverWrap(Boolean hoverWrap)
    If `this.showHover` is true, this property can be used to customize the whether content in the hover canvas is displayed in a single line, or wraps.

    Note that if developers wish to have hovers expand horizontally to fit their text without wrapping *up to some maximum*, and then wrap rather than exceeding that maximum, the `hoverAutoFitWidth` and `hoverAutoFitMaxWidth` attributes may be used instead of simply setting hoverWrap to false.

    Parameters:
      `hoverWrap` - New hoverWrap value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setShowHover(java.lang.Boolean)`

  - ### getHoverWrap

    public Boolean getHoverWrap()
    If `this.showHover` is true, this property can be used to customize the whether content in the hover canvas is displayed in a single line, or wraps.

    Note that if developers wish to have hovers expand horizontally to fit their text without wrapping *up to some maximum*, and then wrap rather than exceeding that maximum, the `hoverAutoFitWidth` and `hoverAutoFitMaxWidth` attributes may be used instead of simply setting hoverWrap to false.

    Returns:
      Current hoverWrap value. Default value is null
    See Also:
      - `getShowHover()`

  - ### setHtmlElement

    public Canvas setHtmlElement(Element htmlElement)
    If specified as a pointer to an HTML element present in the DOM, this canvas will be rendered inside that element on `draw()`. If provided as a String, the String will be replaced by a DOM node as returned from document.getElementById(htmlElement) on initialization.

    NOTES:
    This feature is intended for integration with other JavaScript frameworks and legacy page architectures only; the native browser's reaction to DOM insertion is unspecified and unsupported. For consistent cross-browser layout and positioning semantics, use Canvas parents (especially Layouts) and use absolute positioning at top level.

    In some cases, the target element may need a specified height to be rendered correctly. In this cases, you can expect to find a message like the following in the JavaScript console: "isc_DataView_0:can't resize to height: 0; clamping to 1 [enable 'sizing' log for stack trace]"

    Persistence of htmlElement: If `htmlPosition` is set to `"replace"` the htmlElement will be removed from the DOM when the canvas is drawn - therefore the htmlElement attribute will be cleared at this time. Otherwise if a Canvas is clear()d and then draw()n again it will be rendered inside the same htmlElement.
    If a Canvas is added as a child to Canvas parent, its htmlElement will be dropped.

    `position` should typically be set to `"relative"` if the widget is to be rendered inline within a standard page.
    If this method is called after the component has been drawn/initialized: Setter for the `htmlElement`.

    Note : This is an advanced setting

    Overrides:
      `setHtmlElement` in class `BaseWidget`
    Parameters:
      `htmlElement` - New htmlElement for this canvas or Null to clear the existing htmlElement. You may also provide a string with the elements ID, which will have the effect of setting `htmlElement` to the node returned by document.getElementById(element). Note that you may need to set position:relative explicitly following a call to this function. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Positioning overview and related methods`

  - ### getHtmlElement

    public Element getHtmlElement()
    If specified as a pointer to an HTML element present in the DOM, this canvas will be rendered inside that element on `draw()`. If provided as a String, the String will be replaced by a DOM node as returned from document.getElementById(htmlElement) on initialization.

    NOTES:
    This feature is intended for integration with other JavaScript frameworks and legacy page architectures only; the native browser's reaction to DOM insertion is unspecified and unsupported. For consistent cross-browser layout and positioning semantics, use Canvas parents (especially Layouts) and use absolute positioning at top level.

    In some cases, the target element may need a specified height to be rendered correctly. In this cases, you can expect to find a message like the following in the JavaScript console: "isc_DataView_0:can't resize to height: 0; clamping to 1 [enable 'sizing' log for stack trace]"

    Persistence of htmlElement: If `htmlPosition` is set to `"replace"` the htmlElement will be removed from the DOM when the canvas is drawn - therefore the htmlElement attribute will be cleared at this time. Otherwise if a Canvas is clear()d and then draw()n again it will be rendered inside the same htmlElement.
    If a Canvas is added as a child to Canvas parent, its htmlElement will be dropped.

    `position` should typically be set to `"relative"` if the widget is to be rendered inline within a standard page.

    Returns:
      Current htmlElement value. Default value is null
    See Also:
      - `Positioning overview and related methods`

  - ### setHtmlElement

    public Canvas setHtmlElement(String htmlElement)
    If specified as a pointer to an HTML element present in the DOM, this canvas will be rendered inside that element on `draw()`. If provided as a String, the String will be replaced by a DOM node as returned from document.getElementById(htmlElement) on initialization.

    NOTES:
    This feature is intended for integration with other JavaScript frameworks and legacy page architectures only; the native browser's reaction to DOM insertion is unspecified and unsupported. For consistent cross-browser layout and positioning semantics, use Canvas parents (especially Layouts) and use absolute positioning at top level.

    In some cases, the target element may need a specified height to be rendered correctly. In this cases, you can expect to find a message like the following in the JavaScript console: "isc_DataView_0:can't resize to height: 0; clamping to 1 [enable 'sizing' log for stack trace]"

    Persistence of htmlElement: If `htmlPosition` is set to `"replace"` the htmlElement will be removed from the DOM when the canvas is drawn - therefore the htmlElement attribute will be cleared at this time. Otherwise if a Canvas is clear()d and then draw()n again it will be rendered inside the same htmlElement.
    If a Canvas is added as a child to Canvas parent, its htmlElement will be dropped.

    `position` should typically be set to `"relative"` if the widget is to be rendered inline within a standard page.
    If this method is called after the component has been drawn/initialized: Setter for the `htmlElement`.

    Note : This is an advanced setting

    Parameters:
      `htmlElement` - New htmlElement for this canvas or Null to clear the existing htmlElement. You may also provide a string with the elements ID, which will have the effect of setting `htmlElement` to the node returned by document.getElementById(element). Note that you may need to set position:relative explicitly following a call to this function. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Positioning overview and related methods`

  - ### getHtmlElementAsString

    public String getHtmlElementAsString()
    If specified as a pointer to an HTML element present in the DOM, this canvas will be rendered inside that element on `draw()`. If provided as a String, the String will be replaced by a DOM node as returned from document.getElementById(htmlElement) on initialization.

    NOTES:
    This feature is intended for integration with other JavaScript frameworks and legacy page architectures only; the native browser's reaction to DOM insertion is unspecified and unsupported. For consistent cross-browser layout and positioning semantics, use Canvas parents (especially Layouts) and use absolute positioning at top level.

    In some cases, the target element may need a specified height to be rendered correctly. In this cases, you can expect to find a message like the following in the JavaScript console: "isc_DataView_0:can't resize to height: 0; clamping to 1 [enable 'sizing' log for stack trace]"

    Persistence of htmlElement: If `htmlPosition` is set to `"replace"` the htmlElement will be removed from the DOM when the canvas is drawn - therefore the htmlElement attribute will be cleared at this time. Otherwise if a Canvas is clear()d and then draw()n again it will be rendered inside the same htmlElement.
    If a Canvas is added as a child to Canvas parent, its htmlElement will be dropped.

    `position` should typically be set to `"relative"` if the widget is to be rendered inline within a standard page.

    Returns:
      Current htmlElement value. Default value is null
    See Also:
      - `Positioning overview and related methods`

  - ### setHtmlPosition

    public Canvas setHtmlPosition(DrawPosition htmlPosition)
    If `htmlElement` is specified, this attribute specifies the position where the canvas should be inserted relative to the `htmlElement` in the DOM.
    If this method is called after the component has been drawn/initialized: Setter for the `htmlPosition`.

    Note : This is an advanced setting

    Parameters:
      `htmlPosition` - New htmlPosition for this canvas. Default value is "afterBegin"
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Positioning overview and related methods`

  - ### getHtmlPosition

    public DrawPosition getHtmlPosition()
    If `htmlElement` is specified, this attribute specifies the position where the canvas should be inserted relative to the `htmlElement` in the DOM.
    Returns:
      Current htmlPosition value. Default value is "afterBegin"
    See Also:
      - `Positioning overview and related methods`

  - ### setIsGroup

    public Canvas setIsGroup(boolean isGroup) throws IllegalStateException
    Should a grouping frame be shown around this canvas if a non-empty string has been specified for `groupTitle`.
    Parameters:
      `isGroup` - New isGroup value. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `setGroupBorderCSS(java.lang.String)`
      - `setGroupLabelStyleName(java.lang.String)`
      - `setGroupLabelBackgroundColor(java.lang.String)`
      - `Appearance overview and related methods`

  - ### getIsGroup

    public boolean getIsGroup()
    Should a grouping frame be shown around this canvas if a non-empty string has been specified for `groupTitle`.
    Returns:
      Current isGroup value. Default value is true
    See Also:
      - `getGroupBorderCSS()`
      - `getGroupLabelStyleName()`
      - `getGroupLabelBackgroundColor()`
      - `Appearance overview and related methods`

  - ### getIsPrinting

    public Boolean getIsPrinting() throws IllegalStateException
    This boolean flag will be set to true by framework logic while generating print HTML for this widget as a result to a call to `showPrintPreview()` (or just `getPrintHTML()`). Note that this flag is set recursively as parent widgets generate print HTML for their children.

    This is a read-only property and should not be modified by application code.

    Note : This method should be called only after the widget has been rendered.

    Returns:
      Current isPrinting value. Default value is false
    Throws:
      `IllegalStateException` - if this widget has not yet been rendered.

  - ### setIsRuleScope

    public Canvas setIsRuleScope(Boolean isRuleScope) throws IllegalStateException
    Marks this Canvas as the `ruleScope` that will be discovered by any contained `DataBoundComponent`s which do not specify an explicit `ruleScope`.
    Parameters:
      `isRuleScope` - New isRuleScope value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getIsRuleScope

    public Boolean getIsRuleScope()
    Marks this Canvas as the `ruleScope` that will be discovered by any contained `DataBoundComponent`s which do not specify an explicit `ruleScope`.
    Returns:
      Current isRuleScope value. Default value is null

  - ### setIsSnapAlignCandidate

    public Canvas setIsSnapAlignCandidate(Boolean isSnapAlignCandidate)
    Flag to disable snapping to alignment against this Canvas when other Canvases dragged into the same parent when `childrenSnapAlign` is enabled on this Canvas' parent.
    Parameters:
      `isSnapAlignCandidate` - New isSnapAlignCandidate value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getIsSnapAlignCandidate

    public Boolean getIsSnapAlignCandidate()
    Flag to disable snapping to alignment against this Canvas when other Canvases dragged into the same parent when `childrenSnapAlign` is enabled on this Canvas' parent.
    Returns:
      Current isSnapAlignCandidate value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setKeepInParentRect

    public Canvas setKeepInParentRect(Boolean keepInParentRect)
    Constrains drag-resizing and drag-repositioning of this canvas to either the rect of its parent (if set to true) or an arbitrary rect based on its parent (if set to a [Left,Top,Width,Height] rect array). In the latter mode you may use negative offsets for left/top and a width/height greater than the visible or scroll width of the parent to allow positioning beyond the confines of the parent.

    If this canvas has no parent, constrains dragging to within the browser window.

    Affects target and outline dragAppearance, not tracker.

    Note: keepInParentRect affects only user drag interactions, not programmatic moves.

    Example use cases:
    `keepInParentRect: true` - confine to parent
    `keepInParentRect: [0, 0, 500, 500]` - confine to top left 500x500 region within parent
    `keepInParentRect: [0, 0, 10000, 10000]` - in combination with overflow: "auto", confine to parent, but allow moving off the right and bottom of the parent to force scrolling (and hence enlarge the scrollWidth of the parent).

    Note : This is an advanced setting

    Parameters:
      `keepInParentRect` - New keepInParentRect value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`
      - Drag create Example

  - ### getKeepInParentRect

    public Boolean getKeepInParentRect()
    Constrains drag-resizing and drag-repositioning of this canvas to either the rect of its parent (if set to true) or an arbitrary rect based on its parent (if set to a [Left,Top,Width,Height] rect array). In the latter mode you may use negative offsets for left/top and a width/height greater than the visible or scroll width of the parent to allow positioning beyond the confines of the parent.

    If this canvas has no parent, constrains dragging to within the browser window.

    Affects target and outline dragAppearance, not tracker.

    Note: keepInParentRect affects only user drag interactions, not programmatic moves.

    Example use cases:
    `keepInParentRect: true` - confine to parent
    `keepInParentRect: [0, 0, 500, 500]` - confine to top left 500x500 region within parent
    `keepInParentRect: [0, 0, 10000, 10000]` - in combination with overflow: "auto", confine to parent, but allow moving off the right and bottom of the parent to force scrolling (and hence enlarge the scrollWidth of the parent).

    Returns:
      Current keepInParentRect value. Default value is null
    See Also:
      - `Drag and Drop`
      - Drag create Example

  - ### setKeepInParentRect

    public Canvas setKeepInParentRect(Integer... keepInParentRect)
    Constrains drag-resizing and drag-repositioning of this canvas to either the rect of its parent (if set to true) or an arbitrary rect based on its parent (if set to a [Left,Top,Width,Height] rect array). In the latter mode you may use negative offsets for left/top and a width/height greater than the visible or scroll width of the parent to allow positioning beyond the confines of the parent.

    If this canvas has no parent, constrains dragging to within the browser window.

    Affects target and outline dragAppearance, not tracker.

    Note: keepInParentRect affects only user drag interactions, not programmatic moves.

    Example use cases:
    `keepInParentRect: true` - confine to parent
    `keepInParentRect: [0, 0, 500, 500]` - confine to top left 500x500 region within parent
    `keepInParentRect: [0, 0, 10000, 10000]` - in combination with overflow: "auto", confine to parent, but allow moving off the right and bottom of the parent to force scrolling (and hence enlarge the scrollWidth of the parent).

    Note : This is an advanced setting

    Parameters:
      `keepInParentRect` - New keepInParentRect value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`
      - Drag create Example

  - ### setLayoutAlign

    public Canvas setLayoutAlign(Alignment layoutAlign)
    When this Canvas is included as a member in a Layout, layoutAlign controls alignment on the breadth axis of the layout. Default is "left" for a VLayout, "top" for an HLayout.
    Parameters:
      `layoutAlign` - New layoutAlign value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `LayoutMember overview and related methods`

  - ### getLayoutAlign

    public Alignment getLayoutAlign()
    When this Canvas is included as a member in a Layout, layoutAlign controls alignment on the breadth axis of the layout. Default is "left" for a VLayout, "top" for an HLayout.
    Returns:
      Current layoutAlign value. Default value is null
    See Also:
      - `LayoutMember overview and related methods`

  - ### setLayoutAlign

    public Canvas setLayoutAlign(VerticalAlignment layoutAlign)
    When this Canvas is included as a member in a Layout, layoutAlign controls alignment on the breadth axis of the layout. Default is "left" for a VLayout, "top" for an HLayout.
    Parameters:
      `layoutAlign` - New layoutAlign value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `LayoutMember overview and related methods`

  - ### setLeaveGroupLabelSpace

    public Canvas setLeaveGroupLabelSpace(Boolean leaveGroupLabelSpace) throws IllegalStateException
    When showing this widget in a `group`, should any content be shifted down so that the group-label doesn't sit in front of it?
    Parameters:
      `leaveGroupLabelSpace` - New leaveGroupLabelSpace value. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Appearance overview and related methods`

  - ### getLeaveGroupLabelSpace

    public Boolean getLeaveGroupLabelSpace()
    When showing this widget in a `group`, should any content be shifted down so that the group-label doesn't sit in front of it?
    Returns:
      Current leaveGroupLabelSpace value. Default value is true
    See Also:
      - `Appearance overview and related methods`

  - ### setLeavePageSpace

    public Canvas setLeavePageSpace(Integer leavePageSpace)
    If set, overrides the global `defaultPageSpace`.
    If this method is called after the component has been drawn/initialized: Setter for `leavePageSpace`.

    Note : This is an advanced setting

    Parameters:
      `leavePageSpace` - new value for `leavePageSpace`. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Positioning overview and related methods`

  - ### getLeavePageSpace

    public Integer getLeavePageSpace()
    If set, overrides the global `defaultPageSpace`.
    Returns:
      Current leavePageSpace value. Default value is null
    See Also:
      - `Positioning overview and related methods`

  - ### setLeft

    public Canvas setLeft(int left)
    Number of pixels the left side of the widget is offset to the right from its default drawing context (either its parent's topleft corner, or the document flow, depending on the value of the `position` property).

    Can also be set as a percentage, specified as a String ending in '%', eg, "50%". In this case the top coordinate is considered as a percentage of the specified width of the `parent`.
    If this method is called after the component has been drawn/initialized: Set the left coordinate of this object, relative to its enclosing context, in pixels. NOTE: if you're setting multiple coordinates, use setRect(), moveTo() or resizeTo() instead

    Parameters:
      `left` - new left coordinate. Default value is 0
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Positioning overview and related methods`

  - ### getLeft

    public int getLeft()
    Number of pixels the left side of the widget is offset to the right from its default drawing context (either its parent's topleft corner, or the document flow, depending on the value of the `position` property).

    Can also be set as a percentage, specified as a String ending in '%', eg, "50%". In this case the top coordinate is considered as a percentage of the specified width of the `parent`.

    Returns:
      Return the left coordinate of this object, relative to its enclosing context, in pixels. Default value is 0
    See Also:
      - `Positioning overview and related methods`

  - ### setLeft

    public Canvas setLeft(String left)
    Number of pixels the left side of the widget is offset to the right from its default drawing context (either its parent's topleft corner, or the document flow, depending on the value of the `position` property).

    Can also be set as a percentage, specified as a String ending in '%', eg, "50%". In this case the top coordinate is considered as a percentage of the specified width of the `parent`.
    If this method is called after the component has been drawn/initialized: Set the left coordinate of this object, relative to its enclosing context, in pixels. NOTE: if you're setting multiple coordinates, use setRect(), moveTo() or resizeTo() instead

    Parameters:
      `left` - new left coordinate. Default value is 0
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Positioning overview and related methods`

  - ### setLocateByIDOnly

    public Canvas setLocateByIDOnly(boolean locateByIDOnly)
    If `true`, when retrieving a `locator` for this component always return a reference directly to this component by `widget ID`, using the compact format `"///canvasID"`, ignoring any parent elements and ignoring any configured `testRoot`. This format of locator will always be resolved back to the component by ID regardless of any changes in its position in the UI structure of an application.

    This setting is appropriate for components which are expected to always be present in an application with a stable `ID`.

    Note : This is an advanced setting

    Parameters:
      `locateByIDOnly` - New locateByIDOnly value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getLocateByIDOnly

    public boolean getLocateByIDOnly()
    If `true`, when retrieving a `locator` for this component always return a reference directly to this component by `widget ID`, using the compact format `"///canvasID"`, ignoring any parent elements and ignoring any configured `testRoot`. This format of locator will always be resolved back to the component by ID regardless of any changes in its position in the UI structure of an application.

    This setting is appropriate for components which are expected to always be present in an application with a stable `ID`.

    Returns:
      Current locateByIDOnly value. Default value is false

  - ### setLocateChildrenBy

    public Canvas setLocateChildrenBy(LocatorStrategy locateChildrenBy)
    Strategy to use when locating children in this canvas from an autoTest locator string.

    Note : This is an advanced setting

    Parameters:
      `locateChildrenBy` - New locateChildrenBy value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getLocateChildrenBy

    public LocatorStrategy getLocateChildrenBy()
    Strategy to use when locating children in this canvas from an autoTest locator string.
    Returns:
      Current locateChildrenBy value. Default value is null

  - ### setLocateChildrenType

    public Canvas setLocateChildrenType(LocatorTypeStrategy locateChildrenType)
    `LocatorTypeStrategy` to use when finding children within this canvas.

    Note : This is an advanced setting

    Parameters:
      `locateChildrenType` - New locateChildrenType value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getLocateChildrenType

    public LocatorTypeStrategy getLocateChildrenType()
    `LocatorTypeStrategy` to use when finding children within this canvas.
    Returns:
      Current locateChildrenType value. Default value is null

  - ### setLocatePeersBy

    public Canvas setLocatePeersBy(LocatorStrategy locatePeersBy)
    Strategy to use when locating peers of this canvas from an autoTest locator string.

    Note : This is an advanced setting

    Parameters:
      `locatePeersBy` - New locatePeersBy value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getLocatePeersBy

    public LocatorStrategy getLocatePeersBy()
    Strategy to use when locating peers of this canvas from an autoTest locator string.
    Returns:
      Current locatePeersBy value. Default value is null

  - ### setLocatePeersType

    public Canvas setLocatePeersType(LocatorTypeStrategy locatePeersType)
    `LocatorTypeStrategy` to use when finding peers of this canvas.

    Note : This is an advanced setting

    Parameters:
      `locatePeersType` - New locatePeersType value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getLocatePeersType

    public LocatorTypeStrategy getLocatePeersType()
    `LocatorTypeStrategy` to use when finding peers of this canvas.
    Returns:
      Current locatePeersType value. Default value is null

  - ### setLocatorName

    public Canvas setLocatorName(String locatorName)
    Local name for referencing this canvas from an autoTest locator string. It will be used instead of `index` if found. This name must by unique within the parent component.

    By setting a static ID on certain top-level components and then using locatorName in contained components, stable locators can be created for these components without the need to pervasively assign IDs.

    Note : This is an advanced setting

    Parameters:
      `locatorName` - New locatorName value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getLocatorName

    public String getLocatorName()
    Local name for referencing this canvas from an autoTest locator string. It will be used instead of `index` if found. This name must by unique within the parent component.

    By setting a static ID on certain top-level components and then using locatorName in contained components, stable locators can be created for these components without the need to pervasively assign IDs.

    Returns:
      Current locatorName value. Default value is null

  - ### setMargin

    public Canvas setMargin(Integer margin)
    Set the CSS Margin, in pixels, for this component. Margin provides blank space outside of the border.

    This property sets the same thickness of margin on every side. Differing per-side margins can be set in a CSS style and applied via `styleName`.

    Note that the specified size of the widget will be the size including the margin thickness on each side.
    If this method is called after the component has been drawn/initialized: Set the CSS Margin, in pixels, for this component. Margin provides blank space outside of the border.

    This property sets the same thickness of margin on every side. Differing per-side margins can be set in a CSS style and applied via `styleName`.

    Note that the specified size of the widget will be the size including the margin thickness on each side.

    Parameters:
      `margin` - new margin in pixels. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Appearance overview and related methods`

  - ### getMargin

    public Integer getMargin()
    Set the CSS Margin, in pixels, for this component. Margin provides blank space outside of the border.

    This property sets the same thickness of margin on every side. Differing per-side margins can be set in a CSS style and applied via `styleName`.

    Note that the specified size of the widget will be the size including the margin thickness on each side.

    Returns:
      Current margin value. Default value is null
    See Also:
      - `Appearance overview and related methods`

  - ### getMasterElement

    public Canvas getMasterElement() throws IllegalStateException
    Deprecated.
    In favor or `getMasterCanvas()` as of Smart GWT release 9.1
    This Canvas's "master" (the Canvas to which it was added as a peer), if any.

    Note : This method should be called only after the widget has been rendered.

    Returns:
      Current masterElement value. Default value is null
    Throws:
      `IllegalStateException` - if this widget has not yet been rendered.
    See Also:
      - `Component Containment and Hierarchy`

  - ### setMatchElement

    public Canvas setMatchElement(Boolean matchElement)
    If `htmlElement` is specified, should this canvas be drawn at the same dimensions as the htmlElement?
    See also `matchElementWidth` and `matchElementHeight`

    By default, if `htmlPosition` is anything other than `"replace"`, setting this property will cause the canvas resize with the element if the element itself subsequently resizes (for example due to page reflow).

    To disable this behavior for backwards compatibility or other reasons, use `persistentMatchElement`

    Note : This is an advanced setting

    Parameters:
      `matchElement` - New matchElement value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getMatchElement

    public Boolean getMatchElement()
    If `htmlElement` is specified, should this canvas be drawn at the same dimensions as the htmlElement?
    See also `matchElementWidth` and `matchElementHeight`

    By default, if `htmlPosition` is anything other than `"replace"`, setting this property will cause the canvas resize with the element if the element itself subsequently resizes (for example due to page reflow).

    To disable this behavior for backwards compatibility or other reasons, use `persistentMatchElement`

    Returns:
      Current matchElement value. Default value is null

  - ### setMatchElementHeight

    public Canvas setMatchElementHeight(MatchElementSizeMode matchElementHeight) throws IllegalStateException
    For canvases with a specified `htmlElement` where `persistentMatchElement` is set to true, how should the canvas match the element's height?

    Note : This is an advanced setting

    Parameters:
      `matchElementHeight` - New matchElementHeight value. Default value is "matchElement"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getMatchElementHeight

    public MatchElementSizeMode getMatchElementHeight()
    For canvases with a specified `htmlElement` where `persistentMatchElement` is set to true, how should the canvas match the element's height?
    Returns:
      Current matchElementHeight value. Default value is "matchElement"

  - ### setMatchElementWidth

    public Canvas setMatchElementWidth(MatchElementSizeMode matchElementWidth) throws IllegalStateException
    For canvases with a specified `htmlElement` where `persistentMatchElement` is set to true, how should the canvas match the element's width?

    Note : This is an advanced setting

    Parameters:
      `matchElementWidth` - New matchElementWidth value. Default value is "matchElement"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getMatchElementWidth

    public MatchElementSizeMode getMatchElementWidth()
    For canvases with a specified `htmlElement` where `persistentMatchElement` is set to true, how should the canvas match the element's width?
    Returns:
      Current matchElementWidth value. Default value is "matchElement"

  - ### setMaxHeight

    public Canvas setMaxHeight(int maxHeight)
    Maximum height available to this Canvas. See `maxWidth` for details of behavior.

    Note : This is an advanced setting

    Parameters:
      `maxHeight` - New maxHeight value. Default value is 10000
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setDragMaxHeight(int)`
      - `Sizing overview and related methods`

  - ### getMaxHeight

    public int getMaxHeight()
    Maximum height available to this Canvas. See `maxWidth` for details of behavior.
    Returns:
      Current maxHeight value. Default value is 10000
    See Also:
      - `getDragMaxHeight()`
      - `Sizing overview and related methods`

  - ### setMaxWidth

    public Canvas setMaxWidth(int maxWidth)
    Maximum width available to this Canvas.

    The `maxWidth` and `maxHeight` settings apply to:

    - For a canvas being managed as a member of a `Layout`, the maximum size the layout should apply to the canvas.
    - For a canvas with a width or height specified as a percent value, a maximum numeric pixel value to limit how large the canvas is sized.
    - determining size for a Canvas in a `CanvasItem` (`maxHeight` only)
    - end user `drag resizing`
    Maximum sizes do not apply in various other circumstances where sizes are being determined, such as `ListGrid recordComponents`.

    Note : This is an advanced setting

    Parameters:
      `maxWidth` - New maxWidth value. Default value is 10000
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setDragMaxWidth(int)`
      - `Sizing overview and related methods`

  - ### getMaxWidth

    public int getMaxWidth()
    Maximum width available to this Canvas.

    The `maxWidth` and `maxHeight` settings apply to:

    - For a canvas being managed as a member of a `Layout`, the maximum size the layout should apply to the canvas.
    - For a canvas with a width or height specified as a percent value, a maximum numeric pixel value to limit how large the canvas is sized.
    - determining size for a Canvas in a `CanvasItem` (`maxHeight` only)
    - end user `drag resizing`
    Maximum sizes do not apply in various other circumstances where sizes are being determined, such as `ListGrid recordComponents`.
    Returns:
      Current maxWidth value. Default value is 10000
    See Also:
      - `getDragMaxWidth()`
      - `Sizing overview and related methods`

  - ### setMaxZoomOverflowError

    public Canvas setMaxZoomOverflowError(int maxZoomOverflowError)
    When `correctZoomOverflow` is true and browser or OS-level zoom is active, determines how much overflow must occur before the Framework enables scrolling for this canvas.

    The larger the value, the more clipping that can occur before scrolling is enabled. So, this property should never be set larger than the minimum amount needed to prevent scrollbar oscillation when zoomed - which is the maximum scrollHeight or scrollWidth error.

    Note : This is an advanced setting

    Parameters:
      `maxZoomOverflowError` - New maxZoomOverflowError value. Default value is varies
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getMaxZoomOverflowError

    public int getMaxZoomOverflowError()
    When `correctZoomOverflow` is true and browser or OS-level zoom is active, determines how much overflow must occur before the Framework enables scrolling for this canvas.

    The larger the value, the more clipping that can occur before scrolling is enabled. So, this property should never be set larger than the minimum amount needed to prevent scrollbar oscillation when zoomed - which is the maximum scrollHeight or scrollWidth error.

    Returns:
      Current maxZoomOverflowError value. Default value is varies

  - ### setMenuConstructor

    public Canvas setMenuConstructor(String menuConstructor) throws IllegalStateException
    Default class used to construct menus created by this component, including context menus.
    Parameters:
      `menuConstructor` - New menuConstructor value. Default value is "Menu"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `ShowContextMenuEvent`
      - `SCClassName`
      - `Cues overview and related methods`

  - ### getMenuConstructor

    public String getMenuConstructor()
    Default class used to construct menus created by this component, including context menus.
    Returns:
      Current menuConstructor value. Default value is "Menu"
    See Also:
      - `ShowContextMenuEvent`
      - `SCClassName`
      - `Cues overview and related methods`

  - ### setMinHeight

    public Canvas setMinHeight(int minHeight)
    Minimum height available to this Canvas. Minimum sizes do not apply to all situations. See `minWidth` for details.
    If this method is called after the component has been drawn/initialized: Resizes the widget vertically if required to satisfy the specified `minHeight`.

    Note : This is an advanced setting

    Parameters:
      `minHeight` - new minimum height. Default value is 0
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setDragMinHeight(int)`
      - `Sizing overview and related methods`

  - ### getMinHeight

    public int getMinHeight()
    Minimum height available to this Canvas. Minimum sizes do not apply to all situations. See `minWidth` for details.
    Returns:
      Current minHeight value. Default value is 0
    See Also:
      - `getDragMinHeight()`
      - `Sizing overview and related methods`

  - ### setMinNonEdgeSize

    public Canvas setMinNonEdgeSize(int minNonEdgeSize)
    If the widget has drag resize configured on one or more of it's edges, and the edgeMarginSize is large enough that the remaining space is less than `minNonEdgeSize`, the edgeMarginSize will be reduced such that the non-edge part of the widget is at least 1/3 of the total space (with two draggable edges) or half of it (with one draggable edge).

    Note : This is an advanced setting

    Parameters:
      `minNonEdgeSize` - New minNonEdgeSize value. Default value is 0
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`
      - Drag resize Example

  - ### getMinNonEdgeSize

    public int getMinNonEdgeSize()
    If the widget has drag resize configured on one or more of it's edges, and the edgeMarginSize is large enough that the remaining space is less than `minNonEdgeSize`, the edgeMarginSize will be reduced such that the non-edge part of the widget is at least 1/3 of the total space (with two draggable edges) or half of it (with one draggable edge).
    Returns:
      Current minNonEdgeSize value. Default value is 0
    See Also:
      - `Drag and Drop`
      - Drag resize Example

  - ### setMinWidth

    public Canvas setMinWidth(int minWidth)
    Minimum width available to this Canvas.

    The `minWidth` and `minHeight` settings apply to:

    - For a canvas being managed as a member of a `Layout`, the minimum size the layout should apply to the canvas.
    - For a canvas with a width or height specified as a percent value, a minimum numeric pixel value to limit how large the canvas is sized.
    - determining size for a Canvas in a `CanvasItem` (`minHeight` only)
    - end user `drag resizing`
    - minimum size when using `Overflow` "visible" outside of a Layout - minimum size will be the greater of this setting or the minimum size needed to make all content visible

    Minimum sizes do not apply in various other circumstances where sizes are being determined, such as `ListGrid recordComponents`.

    See also `Layout.minMemberLength` as a way of establishing minimum sizes along the length axis for all members of a `Layout` with a single setting.
    If this method is called after the component has been drawn/initialized: Resizes the widget horizontally if required to satisfy the specified `minWidth`.

    Note : This is an advanced setting

    Parameters:
      `minWidth` - new minimum width. Default value is 0
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setDragMinWidth(int)`
      - `Sizing overview and related methods`

  - ### getMinWidth

    public int getMinWidth()
    Minimum width available to this Canvas.

    The `minWidth` and `minHeight` settings apply to:

    - For a canvas being managed as a member of a `Layout`, the minimum size the layout should apply to the canvas.
    - For a canvas with a width or height specified as a percent value, a minimum numeric pixel value to limit how large the canvas is sized.
    - determining size for a Canvas in a `CanvasItem` (`minHeight` only)
    - end user `drag resizing`
    - minimum size when using `Overflow` "visible" outside of a Layout - minimum size will be the greater of this setting or the minimum size needed to make all content visible

    Minimum sizes do not apply in various other circumstances where sizes are being determined, such as `ListGrid recordComponents`.

    See also `Layout.minMemberLength` as a way of establishing minimum sizes along the length axis for all members of a `Layout` with a single setting.

    Returns:
      Current minWidth value. Default value is 0
    See Also:
      - `getDragMinWidth()`
      - `Sizing overview and related methods`

  - ### setMomentumScrollMinSpeed

    public Canvas setMomentumScrollMinSpeed(double momentumScrollMinSpeed)
    The minimum speed in pixels per second that must be reached for momentum scrolling to kick in. This setting only applies to touch-enabled devices.

    Note : This is an advanced setting

    Parameters:
      `momentumScrollMinSpeed` - New momentumScrollMinSpeed value. Default value is 200
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getMomentumScrollMinSpeed

    public double getMomentumScrollMinSpeed()
    The minimum speed in pixels per second that must be reached for momentum scrolling to kick in. This setting only applies to touch-enabled devices.
    Returns:
      Current momentumScrollMinSpeed value. Default value is 200

  - ### setMouseStillDownDelay

    public Canvas setMouseStillDownDelay(int mouseStillDownDelay)
    Amount of time (in milliseconds) between repeated 'mouseStillDown' events for this canvas. See `Canvas.mouseStillDown()` for details.

    Note : This is an advanced setting

    Parameters:
      `mouseStillDownDelay` - New mouseStillDownDelay value. Default value is 100
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getMouseStillDownDelay

    public int getMouseStillDownDelay()
    Amount of time (in milliseconds) between repeated 'mouseStillDown' events for this canvas. See `Canvas.mouseStillDown()` for details.
    Returns:
      Current mouseStillDownDelay value. Default value is 100

  - ### setMouseStillDownInitialDelay

    public Canvas setMouseStillDownInitialDelay(int mouseStillDownInitialDelay)
    Amount of time (in milliseconds) before mouseStillDown events start to be fired repeatedly for this canvas. See `Canvas.mouseStillDown()` for details.

    Note : This is an advanced setting

    Parameters:
      `mouseStillDownInitialDelay` - New mouseStillDownInitialDelay value. Default value is 400
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getMouseStillDownInitialDelay

    public int getMouseStillDownInitialDelay()
    Amount of time (in milliseconds) before mouseStillDown events start to be fired repeatedly for this canvas. See `Canvas.mouseStillDown()` for details.
    Returns:
      Current mouseStillDownInitialDelay value. Default value is 400

  - ### setName

    public Canvas setName(String name) throws IllegalStateException
    Optional name for the canvas, which can later be used to reference it. Need not be globally unique, but should be unique within the `parent` to get defined results for `Layout.getMember()` and `Layout.getMemberNumber()`.
    Parameters:
      `name` - New name value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `BaseWidget.setID(java.lang.String)`
      - `Identifier`

  - ### getName

    public String getName()
    Optional name for the canvas, which can later be used to reference it. Need not be globally unique, but should be unique within the `parent` to get defined results for `Layout.getMember()` and `Layout.getMemberNumber()`.
    Returns:
      Current name value. Default value is null
    See Also:
      - `BaseWidget.getID()`
      - `Identifier`

  - ### setNativeAutoHideScrollbars

    public Canvas setNativeAutoHideScrollbars(Boolean nativeAutoHideScrollbars) throws IllegalStateException
    In some platform/browser configurations, scrollable regions do not show visible scrollbars until the user attempts to interact with the region. The interaction to show the scrollbar varies by browser/OS but may include starting a trackpad scroll or simply rolling over the scrollable element.

    If `nativeAutoHideScrollbars` is set to true, we detect platforms that show scrollbars dynamically on user interaction and for components with `showCustomScrollbars` we ignore the specified `scrollbarConstructor`, and instead create system-managed native scrollbars via the special NativeScrollbar class, and set `floatingScrollbars` to true.

    This means that on platforms with auto-hiding scrollbars (such as macOS and Windows 11 Firefox), both `scrollbarConstructor` and `showCustomScrollbars` will be ignored in favor of using NativeScrollbar. To force use of a specific scrollbar constructor on all platforms, set `nativeAutoHideScrollbars: false`.

    Not applicable to `touch devices`

    Has no impact if `alwaysShowScrollbars` is true.

    If `showCustomScrollbars` is false, this setting will have no effect (we would be showing custom scrollbars in any case)

    Also does not apply to `touch scrolling interfaces` (where scrollbars are always hidden unless `alwaysShowScrollbars` is true).

    Note : This is an advanced setting

    Parameters:
      `nativeAutoHideScrollbars` - New nativeAutoHideScrollbars value. Default value is *depends on the skin*
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `setScrollbarConstructor(java.lang.String)`
      - `setShowCustomScrollbars(boolean)`
      - `Scrolling overview and related methods`

  - ### getNativeAutoHideScrollbars

    public Boolean getNativeAutoHideScrollbars()
    In some platform/browser configurations, scrollable regions do not show visible scrollbars until the user attempts to interact with the region. The interaction to show the scrollbar varies by browser/OS but may include starting a trackpad scroll or simply rolling over the scrollable element.

    If `nativeAutoHideScrollbars` is set to true, we detect platforms that show scrollbars dynamically on user interaction and for components with `showCustomScrollbars` we ignore the specified `scrollbarConstructor`, and instead create system-managed native scrollbars via the special NativeScrollbar class, and set `floatingScrollbars` to true.

    This means that on platforms with auto-hiding scrollbars (such as macOS and Windows 11 Firefox), both `scrollbarConstructor` and `showCustomScrollbars` will be ignored in favor of using NativeScrollbar. To force use of a specific scrollbar constructor on all platforms, set `nativeAutoHideScrollbars: false`.

    Not applicable to `touch devices`

    Has no impact if `alwaysShowScrollbars` is true.

    If `showCustomScrollbars` is false, this setting will have no effect (we would be showing custom scrollbars in any case)

    Also does not apply to `touch scrolling interfaces` (where scrollbars are always hidden unless `alwaysShowScrollbars` is true).

    Returns:
      Current nativeAutoHideScrollbars value. Default value is *depends on the skin*
    See Also:
      - `com.smartgwt.client.widgets.Canvas#getScrollbarConstructor`
      - `getShowCustomScrollbars()`
      - `Scrolling overview and related methods`

  - ### setNoDoubleClicks

    public Canvas setNoDoubleClicks(Boolean noDoubleClicks)
    If true, this canvas will receive all mouse-clicks as single `click` events rather than as `doubleClick` events.

    Note : This is an advanced setting

    Parameters:
      `noDoubleClicks` - New noDoubleClicks value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getNoDoubleClicks

    public Boolean getNoDoubleClicks()
    If true, this canvas will receive all mouse-clicks as single `click` events rather than as `doubleClick` events.
    Returns:
      Current noDoubleClicks value. Default value is null

  - ### setNoDropCursor

    public Canvas setNoDropCursor(Cursor noDropCursor)
    Specifies the cursor image to display when the user drags a droppable canvas over this if it is not a valid drop target for the event and `showNoDropIndicator` is true.

    Note : This is an advanced setting

    Parameters:
      `noDropCursor` - New noDropCursor value. Default value is Canvas.NOT_ALLOWED
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Cues overview and related methods`

  - ### getNoDropCursor

    public Cursor getNoDropCursor()
    Specifies the cursor image to display when the user drags a droppable canvas over this if it is not a valid drop target for the event and `showNoDropIndicator` is true.
    Returns:
      Current noDropCursor value. Default value is Canvas.NOT_ALLOWED
    See Also:
      - `Cues overview and related methods`

  - ### setOpacity

    public Canvas setOpacity(Integer opacity)
    Renders the widget to be partly transparent. A widget's opacity property may be set to any number between 0 (transparent) to 100 (opaque). Null means don't specify opacity directly, 100 is fully opaque. Note that heavy use of opacity may have a performance impact on some older browsers.

    In older versions of Internet Explorer (Pre IE9 / HTML5), opacity is achieved through proprietary filters. If `filters have been disabled` within this application developers must set `useOpacityFilter` to true for specific components on which opacity support is required.

    Also note that opacity is incompatible with `backMasks`.
    If this method is called after the component has been drawn/initialized: Sets the opacity for the widget to the newOpacity value. This newOpacity value must be within the range of 0 (transparent) to 100 (opaque). Null means don't specify opacity directly. Note that heavy use of opacity may have a performance impact on some older browsers.

    In older versions of Internet Explorer (Pre IE9 / HTML5), opacity is achieved through proprietary filters. If `filters have been disabled` within this application developers must set `useOpacityFilter` to true for specific components on which opacity support is required.

    Also note that opacity is incompatible with `backMasks`.

    Note : This is an advanced setting

    Parameters:
      `opacity` - new opacity level. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Cues overview and related methods`

  - ### getOpacity

    public Integer getOpacity()
    Renders the widget to be partly transparent. A widget's opacity property may be set to any number between 0 (transparent) to 100 (opaque). Null means don't specify opacity directly, 100 is fully opaque. Note that heavy use of opacity may have a performance impact on some older browsers.

    In older versions of Internet Explorer (Pre IE9 / HTML5), opacity is achieved through proprietary filters. If `filters have been disabled` within this application developers must set `useOpacityFilter` to true for specific components on which opacity support is required.

    Also note that opacity is incompatible with `backMasks`.

    Returns:
      Current opacity value. Default value is null
    See Also:
      - `Cues overview and related methods`

  - ### setOverflow

    public Canvas setOverflow(Overflow overflow)
    Controls what happens when the drawn size of the content of a Canvas is either greater or smaller than the specified size of the Canvas. Similar to the CSS property overflow, but consistent across browsers. See Overflow type for details.
    If this method is called after the component has been drawn/initialized: Update the `overflow` of a Canvas after it has been created.
    Parameters:
      `overflow` - New overflow value. Default value is Canvas.VISIBLE
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Sizing overview and related methods`

  - ### getOverflow

    public Overflow getOverflow()
    Controls what happens when the drawn size of the content of a Canvas is either greater or smaller than the specified size of the Canvas. Similar to the CSS property overflow, but consistent across browsers. See Overflow type for details.
    Returns:
      Current overflow value. Default value is Canvas.VISIBLE
    See Also:
      - `Sizing overview and related methods`

  - ### setPadding

    public Canvas setPadding(Integer padding)
    Set the CSS padding of this component, in pixels. Padding provides space between the border and the component's contents.

    This property sets the same thickness of padding on every side. Differing per-side padding can be set in a CSS style and applied via `styleName`.

    Note that CSS padding does not affect the placement of `children`. To provide a blank area around children, either use `CSS margins` or use a `Layout` as the parent instead, and use properties such as `Layout.layoutMargin` to create blank space.
    If this method is called after the component has been drawn/initialized: Set the CSS padding of this component, in pixels. Padding provides space between the border and the component's contents.

    This property sets the same thickness of padding on every side. Differing per-side padding can be set in a CSS style and applied via `styleName`.

    Parameters:
      `padding` - new padding in pixels. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Appearance overview and related methods`

  - ### getPadding

    public Integer getPadding()
    Set the CSS padding of this component, in pixels. Padding provides space between the border and the component's contents.

    This property sets the same thickness of padding on every side. Differing per-side padding can be set in a CSS style and applied via `styleName`.

    Note that CSS padding does not affect the placement of `children`. To provide a blank area around children, either use `CSS margins` or use a `Layout` as the parent instead, and use properties such as `Layout.layoutMargin` to create blank space.

    Returns:
      Current padding value. Default value is null
    See Also:
      - `Appearance overview and related methods`

  - ### setParentCanvas

    public Canvas setParentCanvas(Canvas parentCanvas) throws IllegalStateException
    This Canvas's immediate parent, if any. May be specified as a Canvas instance or the String ID of a Canvas.
    Can be initialized, but any subsequent manipulation should be via `addChild()` and `removeChild()` calls on the parent. The parent Canvas should be fetched using `getParentCanvas()`.

    See `Containment` for an overview of parent/child relationships.

    Parameters:
      `parentCanvas` - New parentCanvas value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Component Containment and Hierarchy`

  - ### getParentCanvas

    public Canvas getParentCanvas()
    This Canvas's immediate parent, if any. May be specified as a Canvas instance or the String ID of a Canvas.
    Can be initialized, but any subsequent manipulation should be via `addChild()` and `removeChild()` calls on the parent. The parent Canvas should be fetched using `getParentCanvas()`.

    See `Containment` for an overview of parent/child relationships.

    Returns:
      Returns the parent of this canvas, if any.

      See `Containment` for an overview of parent/child relationships. Default value is null

    See Also:
      - `Component Containment and Hierarchy`

  - ### setParentCanvas

    public Canvas setParentCanvas(String parentCanvas) throws IllegalStateException
    This Canvas's immediate parent, if any. May be specified as a Canvas instance or the String ID of a Canvas.
    Can be initialized, but any subsequent manipulation should be via `addChild()` and `removeChild()` calls on the parent. The parent Canvas should be fetched using `getParentCanvas()`.

    See `Containment` for an overview of parent/child relationships.

    Parameters:
      `parentCanvas` - New parentCanvas value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Component Containment and Hierarchy`

  - ### getParentCanvasAsString

    public String getParentCanvasAsString()
    This Canvas's immediate parent, if any. May be specified as a Canvas instance or the String ID of a Canvas.
    Can be initialized, but any subsequent manipulation should be via `addChild()` and `removeChild()` calls on the parent. The parent Canvas should be fetched using `getParentCanvas()`.

    See `Containment` for an overview of parent/child relationships.

    Returns:
      Returns the parent of this canvas, if any.

      See `Containment` for an overview of parent/child relationships. Default value is null

    See Also:
      - `Component Containment and Hierarchy`

  - ### setParentElement

    public Canvas setParentElement(Canvas parentElement) throws IllegalStateException
    Deprecated.
    As of Smartclient version 9.1, deprecated in favor of `parentCanvas` and `getParentCanvas()`
    This Canvas's immediate parent, if any. May be specified as a Canvas instance or the String ID of a Canvas.
    Can be initialized, but any subsequent manipulation should be via `addChild()` and `removeChild()` calls on the parent.

    Note : This is an advanced setting

    Parameters:
      `parentElement` - New parentElement value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Component Containment and Hierarchy`

  - ### getParentElement

    public Canvas getParentElement()
    Deprecated.
    As of Smartclient version 9.1, deprecated in favor of `parentCanvas` and `getParentCanvas()`
    This Canvas's immediate parent, if any. May be specified as a Canvas instance or the String ID of a Canvas.
    Can be initialized, but any subsequent manipulation should be via `addChild()` and `removeChild()` calls on the parent.
    Returns:
      Current parentElement value. Default value is null
    See Also:
      - `Component Containment and Hierarchy`

  - ### setParentElement

    public Canvas setParentElement(String parentElement) throws IllegalStateException
    Deprecated.
    As of Smartclient version 9.1, deprecated in favor of `parentCanvas` and `getParentCanvas()`
    This Canvas's immediate parent, if any. May be specified as a Canvas instance or the String ID of a Canvas.
    Can be initialized, but any subsequent manipulation should be via `addChild()` and `removeChild()` calls on the parent.

    Note : This is an advanced setting

    Parameters:
      `parentElement` - New parentElement value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Component Containment and Hierarchy`

  - ### getParentElementAsString

    public String getParentElementAsString()
    Deprecated.
    As of Smartclient version 9.1, deprecated in favor of `parentCanvas` and `getParentCanvas()`
    This Canvas's immediate parent, if any. May be specified as a Canvas instance or the String ID of a Canvas.
    Can be initialized, but any subsequent manipulation should be via `addChild()` and `removeChild()` calls on the parent.
    Returns:
      Current parentElement value. Default value is null
    See Also:
      - `Component Containment and Hierarchy`

  - ### setPeers

    public Canvas setPeers(Canvas... peers) throws IllegalStateException
    Array of all Canvii that are peers of this Canvas.

    Use `addPeer()` and `removePeer()` to add and remove peers after a Canvas has been created/drawn.

    See `Containment` for an overview of master/peer relationships.

    Note : This is an advanced setting

    Parameters:
      `peers` - New peers value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Component Containment and Hierarchy`

  - ### getPeers

    public Canvas[] getPeers()
    Array of all Canvii that are peers of this Canvas.

    Use `addPeer()` and `removePeer()` to add and remove peers after a Canvas has been created/drawn.

    See `Containment` for an overview of master/peer relationships.

    Returns:
      Current peers value. Default value is null
    See Also:
      - `Component Containment and Hierarchy`

  - ### setPendingMarkerStyle

    public Canvas setPendingMarkerStyle(String pendingMarkerStyle)
    CSS class used to apply additional styles to this canvas when `showPendingMarker()` is called, or when `pendingMarkerVisible` has been set.

    The default `pendingMarkerStyle`, pendingMarker, renders a small triangle in the top-left of the Canvas. You can modify this class or provide a custom one to achieve a different display.

    Parameters:
      `pendingMarkerStyle` - New pendingMarkerStyle value. Default value is "pendingMarker"
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `CSSStyleName`

  - ### getPendingMarkerStyle

    public String getPendingMarkerStyle()
    CSS class used to apply additional styles to this canvas when `showPendingMarker()` is called, or when `pendingMarkerVisible` has been set.

    The default `pendingMarkerStyle`, pendingMarker, renders a small triangle in the top-left of the Canvas. You can modify this class or provide a custom one to achieve a different display.

    Returns:
      Current pendingMarkerStyle value. Default value is "pendingMarker"
    See Also:
      - `CSSStyleName`

  - ### setPendingMarkerVisible

    public Canvas setPendingMarkerVisible(Boolean pendingMarkerVisible)
    This attribute indicates whether the `pending marker class` should be appended to the list of CSS classes applied to this canvas. By default, this extra class overlays a small shape in the corner of this canvas.
    Parameters:
      `pendingMarkerVisible` - New pendingMarkerVisible value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getPendingMarkerVisible

    public Boolean getPendingMarkerVisible()
    This attribute indicates whether the `pending marker class` should be appended to the list of CSS classes applied to this canvas. By default, this extra class overlays a small shape in the corner of this canvas.
    Returns:
      Current pendingMarkerVisible value. Default value is null

  - ### setPercentBox

    public Canvas setPercentBox(PercentBoxModel percentBox) throws IllegalStateException
    Governs the model to be used when sizing canvases with percentage width or height, or positioning widgets with a specified `snapTo`.

    Only affects widgets with a a specified `percentSource`, or widgets that have `snapTo` set and are peers of some `other canvas`.

    Determines whether the coordinates used for sizing (for percentage sized widgets) and positioning (if `snapTo` is set) should be relative to the visible size or the viewport size of the percentSource or `master canvas` widget.

    Note : This is an advanced setting

    Parameters:
      `percentBox` - New percentBox value. Default value is "visible"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Sizing overview and related methods`

  - ### getPercentBox

    public PercentBoxModel getPercentBox()
    Governs the model to be used when sizing canvases with percentage width or height, or positioning widgets with a specified `snapTo`.

    Only affects widgets with a a specified `percentSource`, or widgets that have `snapTo` set and are peers of some `other canvas`.

    Determines whether the coordinates used for sizing (for percentage sized widgets) and positioning (if `snapTo` is set) should be relative to the visible size or the viewport size of the percentSource or `master canvas` widget.

    Returns:
      Current percentBox value. Default value is "visible"
    See Also:
      - `Sizing overview and related methods`

  - ### setPercentSource

    public Canvas setPercentSource(Canvas percentSource)
    If this canvas has its size specified as a percentage, this property allows the user to explicitly designate another canvas upon which sizing will be based.

    If unset percentage sizing is based on
    - the `master canvas` if there is one and `snapTo` is set,
    - otherwise on the amount of space available in this widget's parent canvas, if this is a child of some other widget
    - otherwise the page size.
    If this method is called after the component has been drawn/initialized: Setter method for the `percentSource` attribute.

    Note : This is an advanced setting

    Parameters:
      `percentSource` - eterNew percent source (if omitted existing percentSource will just be cleared). Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setPercentBox(com.smartgwt.client.types.PercentBoxModel)`
      - `Sizing overview and related methods`

  - ### getPercentSource

    public Canvas getPercentSource()
    If this canvas has its size specified as a percentage, this property allows the user to explicitly designate another canvas upon which sizing will be based.

    If unset percentage sizing is based on
    - the `master canvas` if there is one and `snapTo` is set,
    - otherwise on the amount of space available in this widget's parent canvas, if this is a child of some other widget
    - otherwise the page size.

    Returns:
      Current percentSource value. Default value is null
    See Also:
      - `getPercentBox()`
      - `Sizing overview and related methods`

  - ### setPersistentMatchElement

    public Canvas setPersistentMatchElement(Boolean persistentMatchElement) throws IllegalStateException
    If this canvas has a specified `htmlElement` and `matchElement` is set to true, should the canvas perform a one time resize to fit the target element on draw, or should it continue to match the target element as its size changes due to page reflows?

    Note : This is an advanced setting

    Parameters:
      `persistentMatchElement` - New persistentMatchElement value. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getPersistentMatchElement

    public Boolean getPersistentMatchElement()
    If this canvas has a specified `htmlElement` and `matchElement` is set to true, should the canvas perform a one time resize to fit the target element on draw, or should it continue to match the target element as its size changes due to page reflows?
    Returns:
      Current persistentMatchElement value. Default value is true

  - ### setPointerSettings

    public Canvas setPointerSettings(PointerSettings pointerSettings) throws IllegalStateException
    Detail settings of the `pointer` such as where it should be located along the outside of the canvas.
    Parameters:
      `pointerSettings` - New pointerSettings value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getPointerSettings

    public PointerSettings getPointerSettings()
    Detail settings of the `pointer` such as where it should be located along the outside of the canvas.
    Returns:
      Current pointerSettings value. Default value is null

  - ### setPointerTarget

    public Canvas setPointerTarget(String pointerTarget) throws IllegalStateException
    This property in conjunction with the `pointerSettings.snapTo` places the canvas in relation to the target canvas.

    Depending on the `pointerSettings.snapTo` and the `pointerSettings.targetSnapTo` the canvas will be positioned so the pointer correctly points to the target.

    A `pointerTarget` can be specified ether as an `AutoTestLocator` or a `GlobalId`.

    Parameters:
      `pointerTarget` - New pointerTarget value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `AutoTestLocator`

  - ### getPointerTarget

    public String getPointerTarget()
    This property in conjunction with the `pointerSettings.snapTo` places the canvas in relation to the target canvas.

    Depending on the `pointerSettings.snapTo` and the `pointerSettings.targetSnapTo` the canvas will be positioned so the pointer correctly points to the target.

    A `pointerTarget` can be specified ether as an `AutoTestLocator` or a `GlobalId`.

    Returns:
      Current pointerTarget value. Default value is null
    See Also:
      - `AutoTestLocator`

  - ### getPointerTargetAsString

    public String getPointerTargetAsString()
    This property in conjunction with the `pointerSettings.snapTo` places the canvas in relation to the target canvas.

    Depending on the `pointerSettings.snapTo` and the `pointerSettings.targetSnapTo` the canvas will be positioned so the pointer correctly points to the target.

    A `pointerTarget` can be specified ether as an `AutoTestLocator` or a `GlobalId`.

    Returns:
      Current pointerTarget value. Default value is null
    See Also:
      - `AutoTestLocator`
      - `GlobalId`

  - ### setPosition

    public Canvas setPosition(Positioning position)
    Absolute or relative, corresponding to the "absolute" (with respect to parent) or "relative" (with respect to document flow) values for the CSS position attribute.

    Setting `position:"relative"` enables Smart GWT components to be embedded directly into the native HTML flow of a page, causing the component to be rendered within an existing DOM structure. This attribute should only be set to `"relative"` on a top level component (a component with no `getParentCanvas()`).

    There are 2 ways to embed relatively positioned canvases in the DOM - by default the component will be written out inline when it gets `drawn()n`. For example to embed a canvas in an HTML table you could use this code:

          <table>
            <tr>
              <td>
                <script>
                  isc.Canvas.create({autoDraw:true, backgroundColor:"red", position:"relative"});
                </script>
              <td>
            </tr>
          </table>

    Alternatively you can make use of the `htmlElement` attribute.

    Relative positioning is intended as a short-term integration scenario while incrementally upgrading existing applications. Note that relative positioning is not used to manage layout within Smart GWT components - instead the `Layout` class would typically be used. For best consistency and flexibility across browsers, all Smart GWT layout managers use absolute positioning.

    For canvases with a specified `htmlElement`, this attribute defaults to `"relative"`. In all other cases the default value will be `"absolute"`. Note that if you plan to call `setHtmlElement()` after init, you will need to set this value to "relative" explicitly.

    Note : This is an advanced setting

    Parameters:
      `position` - New position value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Positioning overview and related methods`

  - ### getPosition

    public Positioning getPosition()
    Absolute or relative, corresponding to the "absolute" (with respect to parent) or "relative" (with respect to document flow) values for the CSS position attribute.

    Setting `position:"relative"` enables Smart GWT components to be embedded directly into the native HTML flow of a page, causing the component to be rendered within an existing DOM structure. This attribute should only be set to `"relative"` on a top level component (a component with no `getParentCanvas()`).

    There are 2 ways to embed relatively positioned canvases in the DOM - by default the component will be written out inline when it gets `drawn()n`. For example to embed a canvas in an HTML table you could use this code:

          <table>
            <tr>
              <td>
                <script>
                  isc.Canvas.create({autoDraw:true, backgroundColor:"red", position:"relative"});
                </script>
              <td>
            </tr>
          </table>

    Alternatively you can make use of the `htmlElement` attribute.

    Relative positioning is intended as a short-term integration scenario while incrementally upgrading existing applications. Note that relative positioning is not used to manage layout within Smart GWT components - instead the `Layout` class would typically be used. For best consistency and flexibility across browsers, all Smart GWT layout managers use absolute positioning.

    For canvases with a specified `htmlElement`, this attribute defaults to `"relative"`. In all other cases the default value will be `"absolute"`. Note that if you plan to call `setHtmlElement()` after init, you will need to set this value to "relative" explicitly.

    Returns:
      Current position value. Default value is null
    See Also:
      - `Positioning overview and related methods`

  - ### setPrintChildrenAbsolutelyPositioned

    public Canvas setPrintChildrenAbsolutelyPositioned(Boolean printChildrenAbsolutelyPositioned)
    Should this canvas print its children absolutely positioned when generating `printable HTML`.

    By default explicitly specified absolute positioning and sizing is ignored when generating print HTML. This is done intentionally: there is no way for the framework to predict how explicit sizes will translate to a the printed page and if HTML for printing includes the same absolute positioning and sizing as is displayed within an application it is very common to encounter undesirable effects, such as seeing tables get broken over several pages horizontally when there is enough room to print them on a single page of paper.

    In some cases, however, a developer may wish to have explicit sizing and positioning respected within the print-view. Setting this attribute to `true` will cause this to occur.

    Note : This is an advanced setting

    Parameters:
      `printChildrenAbsolutelyPositioned` - New printChildrenAbsolutelyPositioned value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Printing`

  - ### getPrintChildrenAbsolutelyPositioned

    public Boolean getPrintChildrenAbsolutelyPositioned()
    Should this canvas print its children absolutely positioned when generating `printable HTML`.

    By default explicitly specified absolute positioning and sizing is ignored when generating print HTML. This is done intentionally: there is no way for the framework to predict how explicit sizes will translate to a the printed page and if HTML for printing includes the same absolute positioning and sizing as is displayed within an application it is very common to encounter undesirable effects, such as seeing tables get broken over several pages horizontally when there is enough room to print them on a single page of paper.

    In some cases, however, a developer may wish to have explicit sizing and positioning respected within the print-view. Setting this attribute to `true` will cause this to occur.

    Returns:
      Current printChildrenAbsolutelyPositioned value. Default value is false
    See Also:
      - `Printing`

  - ### setPrintStyleName

    public Canvas setPrintStyleName(String printStyleName)
    The CSS class to apply when printing this widget. If unset, falls back to the `specified style`.
    Parameters:
      `printStyleName` - New printStyleName value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `CSSStyleName`
      - `Appearance overview and related methods`

  - ### getPrintStyleName

    public String getPrintStyleName()
    The CSS class to apply when printing this widget. If unset, falls back to the `specified style`.
    Returns:
      Get the CSS class to apply when printing this widget. Returns the `print style`, if specified, falling back to the `specified style` otherwise. Default value is null
    See Also:
      - `CSSStyleName`
      - `Appearance overview and related methods`

  - ### setPrompt

    public Canvas setPrompt(String prompt)
    Prompt displayed in hover canvas if `showHover` is true.
    Parameters:
      `prompt` - New prompt value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `HTMLString`
      - Hovers / Tooltips Example

  - ### getPrompt

    public String getPrompt()
    Prompt displayed in hover canvas if `showHover` is true.
    Returns:
      Current prompt value. Default value is null
    See Also:
      - `HTMLString`
      - Hovers / Tooltips Example

  - ### setProportionalResizing

    public Canvas setProportionalResizing(ProportionalResizeMode proportionalResizing) throws IllegalStateException
    If `canDragResize` is true, this property specifies the conditions for when proportional resizing is used. The default is `ProportionalResizeMode.MODIFIER_OFF` , which means that proportional resizing is disabled.
    Parameters:
      `proportionalResizing` - New proportionalResizing value. Default value is "none"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `setProportionalResizeModifiers(java.lang.String...)`
      - `Drag and Drop`

  - ### getProportionalResizing

    public ProportionalResizeMode getProportionalResizing()
    If `canDragResize` is true, this property specifies the conditions for when proportional resizing is used. The default is `ProportionalResizeMode.MODIFIER_OFF` , which means that proportional resizing is disabled.
    Returns:
      Current proportionalResizing value. Default value is "none"
    See Also:
      - `getProportionalResizeModifiers()`
      - `Drag and Drop`

  - ### setReceiveScrollbarEvents

    public Canvas setReceiveScrollbarEvents(boolean receiveScrollbarEvents) throws IllegalStateException
    Whether this canvas should receive `events` from its scrollbars, which are `peers`. Normally, a canvas only gets bubbled events from its `children`.

    Note that this property only has an impact if `showCustomScrollbars` is true.

    Parameters:
      `receiveScrollbarEvents` - New receiveScrollbarEvents value. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `setShowCustomScrollbars(boolean)`
      - `Scrolling overview and related methods`

  - ### getReceiveScrollbarEvents

    public boolean getReceiveScrollbarEvents()
    Whether this canvas should receive `events` from its scrollbars, which are `peers`. Normally, a canvas only gets bubbled events from its `children`.

    Note that this property only has an impact if `showCustomScrollbars` is true.

    Returns:
      Current receiveScrollbarEvents value. Default value is true
    See Also:
      - `getShowCustomScrollbars()`
      - `Scrolling overview and related methods`

  - ### setRedrawOnResize

    public Canvas setRedrawOnResize(Boolean redrawOnResize)
    Should this element be redrawn in response to a resize?

    Should be set to true for components whose `inner HTML` will not automatically reflow to fit the component's new size.

    Note : This is an advanced setting

    Parameters:
      `redrawOnResize` - New redrawOnResize value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drawing overview and related methods`

  - ### getRedrawOnResize

    public Boolean getRedrawOnResize()
    Should this element be redrawn in response to a resize?

    Should be set to true for components whose `inner HTML` will not automatically reflow to fit the component's new size.

    Returns:
      Current redrawOnResize value. Default value is null
    See Also:
      - `Drawing overview and related methods`

  - ### setResizeBarTarget

    public Canvas setResizeBarTarget(String resizeBarTarget) throws IllegalStateException
    When this Canvas is included as a member in a Layout, and `showResizeBar` is set to `true` so that a resizeBar is created, `resizeBarTarget:"next"` can be set to indicate that the resizeBar should resize the next member of the layout rather than this one. For resizeBars that support hiding their target member when clicked on, `resizeBarTarget:"next"` also means that the next member will be the one hidden.

    This is typically used to create a 3-way split pane, where left and right-hand sections can be resized or hidden to allow a center section to expand.

    NOTE: as with any Layout, to ensure all available space is used, one or more members must maintain a flexible size (eg 75%, or *). In a two pane Layout with a normal resize bar, to fill all space after a user resizes, the member on the right should have flexible size. With resizeBarTarget:"next", the member on the left should have flexible size.

    Parameters:
      `resizeBarTarget` - New resizeBarTarget value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `setShowResizeBar(java.lang.Boolean)`
      - `LayoutMember overview and related methods`

  - ### getResizeBarTarget

    public String getResizeBarTarget()
    When this Canvas is included as a member in a Layout, and `showResizeBar` is set to `true` so that a resizeBar is created, `resizeBarTarget:"next"` can be set to indicate that the resizeBar should resize the next member of the layout rather than this one. For resizeBars that support hiding their target member when clicked on, `resizeBarTarget:"next"` also means that the next member will be the one hidden.

    This is typically used to create a 3-way split pane, where left and right-hand sections can be resized or hidden to allow a center section to expand.

    NOTE: as with any Layout, to ensure all available space is used, one or more members must maintain a flexible size (eg 75%, or *). In a two pane Layout with a normal resize bar, to fill all space after a user resizes, the member on the right should have flexible size. With resizeBarTarget:"next", the member on the left should have flexible size.

    Returns:
      Current resizeBarTarget value. Default value is null
    See Also:
      - `getShowResizeBar()`
      - `LayoutMember overview and related methods`

  - ### setResizeFrom

    public Canvas setResizeFrom(EdgeName... resizeFrom)
    When drag resizing is enabled via `canDragResize`, restricts resizes to only certain edges or corners.

    The default of null indicates the widget can be resized from any corner or edge (if `canDragResize` is true).

    To restrict resizing to only certain corners, set `resizeFrom` to an Array of `EdgeName`s.

    Note : This is an advanced setting

    Parameters:
      `resizeFrom` - New resizeFrom value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`
      - Drag resize Example

  - ### getResizeFrom

    public EdgeName[] getResizeFrom()
    When drag resizing is enabled via `canDragResize`, restricts resizes to only certain edges or corners.

    The default of null indicates the widget can be resized from any corner or edge (if `canDragResize` is true).

    To restrict resizing to only certain corners, set `resizeFrom` to an Array of `EdgeName`s.

    Returns:
      Current resizeFrom value. Default value is null
    See Also:
      - `Drag and Drop`
      - Drag resize Example

  - ### setRuleScope

    public Canvas setRuleScope(String ruleScope) throws IllegalStateException
    `ID` of the component that gathers the context for evaluation of criteria-based rules specified by properties such as `FormItem.visibleWhen`, Dynamic Properties, and `DynamicCriteria` such as `ListGrid.initialCriteria`.

    If `ruleScope` is not specified, this component will search through its `parentCanvas` chain until it either reaches the top or reaches a parent marked `isRuleScope`. This means that typically, `ruleScope` does not have to be explicitly specified, since components that want to reference each other often have the same top-level parent (eg, they are part of the same screen). However, you would need to specify `ruleScope` in scenarios such as a modal Window that wants to reference values in the component it was launched from.

    Determination of the `ruleScope` happens when the component is first drawn.

    The component designated as the `ruleScope` manages a nested data structure called the "rule context" which contains information from all `DataBoundComponent`s that are registered with the `ruleScope`. By specifying `Criterion.fieldName` as a `DataPath`, AdvancedCriteria defined in properties such as `FormItem.visibleWhen` can access any part of the rule context.

    By default, the rule context contains data as follows:

    - any `DataBoundComponent` or ValuesManager that has a DataSource contributes the values of the selected record or record being edited under the ID of the DataSource. For any collision an editable display (such as a form or editable grid) wins over a static display (such as a non-editable grid with a selection.) Hidden or cleared components have lowest priority even if editable. For two editable components the first becomes the contributor.
    - any ListGrid or other component that manages a selection and has been assigned an explicit `ID` will contribute the values of the selected record under `<componentId>.selectedRecord`, the values of the grid summary record under `<componentId>.summaryRecord`, and also contributes 3 flags for checking for selection: `anySelected`, `multiSelected`, `numSelected`. The selected record can also be identified by row number: `<componentId>.selectedRowNum` which also applies to the edit row since editing implies selection by default.
    - any DynamicForm or other component that edits values and has been assigned an explicit `ID` contributes its current values under `<componentId>.values`, and contributes a flag `hasChanges`.
    - any DynamicForm or ListGrid that has been assigned an explicit `ID` contributes a value `<componentId>.focusField`. When present the value indicates the component has focus along with the name of the field that has focus. Its absense indicates the component does not have focus at all.
    - any ListGrid that has been assigned an explicit `ID` contributes a flag `isGrouped` under `<componentId>`.
    - any DataSource included in a `DataContext` or `testDataContext` that is being used for this ruleScope contributes the values into the `dataContext` section of the ruleContext (ex. `dataContext.Customer`) so the values do not conflict with normal DataSource contributions. Note that the `dataContext` is immutable so only the first contribution is actually saved.

    A `ValuesManager` contributes the DataSource-prefixed portion of ruleContext prior to the member forms. See additional ValuesManager information below.

    In addition to data contributed by DataBoundComponent, the ruleScope also contains entries contributed by the Authentication class, such as the authenticated userId and roles - see `Authentication` for details. Characteristics of the current device is also included as:

          {
           device : {
              isPhone : false,
              isTablet : false,
              isDesktop : true,
              isLandscape : true
           }
          }

    For example, given a screen where:

    - a ListGrid with ID "itemGrid" and DynamicForm with ID "itemForm" are both bound to the `supplyItem` sample DataSource
    - the ListGrid has a single selection, and the record selected in the ListGrid is being edited in the form, and has been changed
    The default rule context available from `getRuleContext()`, expressed as JSON, would be:

          {
           supplyItem : {
              itemID : "654321",
              itemName : "Sewing Machine",
              price : 5.50, // note: user change
              ..other properties..
           },
           itemForm.values : {
              itemID : "654321",
              itemName : "Sewing Machine",
              price : 5.50, // note: user change
              ..other properties..
           },
           itemForm.focusField : "itemName",
           itemForm.hasChanges : true,
           itemGrid.selectedRecord : {
              itemID : "654321",
              itemName : "Sewing Machine",
              price : 3.50, // note: old price
              ..other properties..
           },
           itemGrid.anySelected : true,
           itemGrid.multiSelected : false,
           itemGrid.numSelected : 1,
           itemGrid.isGrouped : false,
           device : {
              isPhone : false,
              isTablet : false,
              isDesktop : true,
              isLandscape : true
           },
           auth : {
              currentUser : {
                 userId: "lisa",
                 firstName: "Lisa",
                 lastName: "Admin",
                 roles: "admin",
                 ..other properties..
              },
              roles : ['admin'],
              isSuperUser : false
           }
          }

    In addition, an application can put custom data into the ruleScope via `provideRuleContext()`.

    #### ValuesManager and RuleContext

    `*WhenRules` in member forms of a ValuesManager using short-form field references (i.e. no prefix) apply to the particular member form. To reference field values outside of the form use the dataSource-prefixed path (e.g. Customer.email).

    ## Troubleshooting RuleScope issues

    The ruleScope system consists of two major parts: managing the rule context and using the rule context. The former is handled by `provideRuleContext()` and `removeRuleContext()`. Users of rule context are the criteria-based rules noted above.

    A number of Log categories are provided to make diagnosing ruleScope issues easier:

    - ruleContext
    - whenRules
    - dynamicProperties
    - dynamicCriteria
    Except for configuration warnings, nothing is logged for these categories unless the log priority is set to either Info or Debug. The priorities can be configured and the log messages reviewed in `Smart GWT Developer Console`. By default none of these categories are included in the `Logging Preferences` category choices. To add one or more of these categories, select `More...` then click `Add...`. Be sure to enter the category with the correct capitalization.

    At the Info log priority one or two basic log messages are generated per action. The Debug priority generally includes additional information like the full criteria or a message for each evaluation even when no change is made.

    ### Using and Interpreting log messages

    To address a specific issue on rules, select the Info priority for the target category in the Developer Console then perform your application actions that are being diagnosed. You may want to re-run your application to get a clean start on the changes.

    #### whenRules and dynamicProperties

    Both of these types of properties are triggered by a criteria that can reference the ruleContext and/or the component's values (for forms). The criteria is re-evaluated on each rule context change and based on the criteria being matched or not, the action is taken or property updated.

    Below are some example Info log messages:

          16:53:39.032:TMR8[E0]:INFO:whenRules:Hide Canvas 'isc_Canvas_1'
          16:53:39.034:TMR8[E1]:INFO:whenRules:Disabling Canvas 'isc_Button_3'
          16:53:39.509:TMR9[E0]:INFO:whenRules:Hide Canvas 'isc_Canvas_2'
          16:53:39.510:TMR9[E1]:INFO:whenRules:Hide Canvas 'isc_Button_4'
          16:53:39.527:TMR4:INFO:whenRules:Show Canvas 'isc_Canvas_2'
          16:53:39.527:TMR4:INFO:whenRules:Show Canvas 'isc_Button_4'
          16:53:39.528:TMR4:INFO:whenRules:Disabling Canvas 'isc_Button_4'
          16:53:39.529:TMR4:INFO:whenRules:Set read-only (appearance disabled) FormItem 'itemForm3.field2'
          16:53:39.974:TMR6:INFO:whenRules:Set editable (appearance disabled) FormItem 'itemForm3.field2'
          16:53:40.540:TMR2:INFO:whenRules:Enabling FormItemIcon 'itemForm4.field2.remove'
          16:53:40.541:TMR2:INFO:whenRules:Hide FormItemIcon 'itemForm4.field4.edit'

    These indicate various responses to `visibleWhen`, `enableWhen`, and `readOnlyWhen` actions.

    By setting the priority to Debug you can see the creation of the rule for the criteria and the evaluation of the criteria before action is taken:

          16:53:41.569:TMR7:DEBUG:whenRules:itemForm6:Create whenRule: itemForm6_field2_readOnly, applyWhen {
              "_constructor":"AdvancedCriteria",
              "operator":"and",
              "criteria":[
                  {
                      "fieldName":"layout1.date1",
                      "operator":"greaterOrEqualField",
                      "value":"layout1.date2"
                  }
              ]
          } to target {component: [DynamicForm ID:itemForm6], fieldName: "field2", formIconName: undef}
          16:53:41.571:TMR7:DEBUG:whenRules:isc_RulesEngine_5:Applying readOnly rule 'itemForm6_field2_readOnly' for FormItem itemForm6.field2 with action result true. applyWhen criteria matched: {
              "__normalized":true,
              "_constructor":"AdvancedCriteria",
              "operator":"and",
              "criteria":[
                  {
                      "__normalized":true,
                      "fieldName":"layout1.date1",
                      "operator":"greaterOrEqualField",
                      "value":"layout1.date2"
                  }
              ]
          }
          16:53:41.571:TMR7:DEBUG:whenRules:Set read-only (appearance disabled) FormItem 'itemForm6.field2'

    dynamicProperties are similar:

          16:59:13.588:XRP8:INFO:dynamicProperties:Set (populateFromDataPath) 'isc_Button_0.title' to [initial value]: Special Title
          16:59:13.650:TMR2:WARN:Class:isc_Class_0:Attempt to evaluate formulaFunction itemForm.values.count * 2 + 10 failed. Error message:undefined is not an object (evaluating 'itemForm.values')
          16:59:13.657:TMR9:INFO:dynamicProperties:Set (populate) 'isc_Class_0.contents' to [initial value]: 34

    This example shows a failed formula indicating that the 'itemForm.values' isn't valid in the ruleContext. In this case the form values haven't been provided to ruleContext yet. When they are the next log message shows the result.

    #### dynamicCriteria

    Each time a dynamic criteria is evaluated (as triggered by a `ruleContextChanged` event) a log entry is made:

          14:54:46.436:INP9:INFO:dynamicCriteria:isc_ListGrid_0:Evaluated dynamic criteria: filterCriteria

    This indicates that dynamicCriteria for isc_ListGrid_0 is being evaluated/re-evaluated. By changing the priority to Debug the resolved criteria is also included:

          14:55:16.231:INP9:DEBUG:dynamicCriteria:isc_ListGrid_0:Evaluated dynamic criteria: filterCriteria {
              "fieldName":"orderNumber",
              "operator":"equals",
              "valuePath":"orderSearchForm.values.orderNumber",
              "value":10104,
              "_constructor":"AdvancedCriteria"
          }

    Note the valuePath of `orderSearchForm.values.orderNumber` is resolved to the value of `10104`.

    #### ruleContext

    If none of the logging above provides details needed to understand what is going on, enabling the ruleContext category can be enabled. At Info a single log message is reported for each ruleContext change.

    For example, below are the rule context changes that occurred to trigger the above dynamicCriteria messages above:

          14:54:46.432:INP9:INFO:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0]: Order.orderNumber = 10104
          14:54:46.433:INP9:INFO:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0]: orderSearchForm.values.orderNumber = 10104
          14:54:46.434:INP9:INFO:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0]: orderSearchForm.hasChanges = true

    This indicates that isc_SearchForm_0 updated rule context with three changed values. There is no indication of when a `ruleContextChanged` event is raised. If that is important, change the log priority to Debug to see more details:

          15:16:43.291:INP9:DEBUG:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0] START TRANSACTION
          15:16:43.292:INP9:DEBUG:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0]: Order.orderNumber = 10104
          15:16:43.292:INP9:DEBUG:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0]: orderSearchForm.values.orderNumber = 10104
          15:16:43.293:INP9:DEBUG:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0]: orderSearchForm.hasChanges = true
          15:16:43.294:INP9:DEBUG:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0] END TRANSACTION

    Here the isc_SearchForm_0 provides rule context changes as part of a 'transaction'. That is, the three values are provided separately but a single `ruleContextChanged` event is raised at the end of the 'transaction'. If only one change is part of a 'transaction' the start/end log messages are suppressed. For example, the isc_ListGrid_0 updates rule context as a result of the change in the dynamic criteria. The criteria is provided to rule context separately from `dataLoading` updates:

          15:16:43.305:INP9:DEBUG:ruleContext:isc_ListGrid_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_ListGrid_0]: orderDetailGrid.criteria = {fieldName: "orderNumber",
                       operator: "equals", valuePath: "orderSearchForm.values.orderNumber", value: 10104, _constructor: "AdvancedCriteria"}
          15:16:43.317:INP9:DEBUG:ruleContext:isc_ListGrid_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_ListGrid_0]: orderDetailGrid.dataLoading = true
          15:16:44.228:TMR2:DEBUG:ruleContext:isc_ListGrid_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_ListGrid_0]: orderDetailGrid.dataLoading = null

    Parameters:
      `ruleScope` - New ruleScope value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getRuleScope

    public String getRuleScope()
    `ID` of the component that gathers the context for evaluation of criteria-based rules specified by properties such as `FormItem.visibleWhen`, Dynamic Properties, and `DynamicCriteria` such as `ListGrid.initialCriteria`.

    If `ruleScope` is not specified, this component will search through its `parentCanvas` chain until it either reaches the top or reaches a parent marked `isRuleScope`. This means that typically, `ruleScope` does not have to be explicitly specified, since components that want to reference each other often have the same top-level parent (eg, they are part of the same screen). However, you would need to specify `ruleScope` in scenarios such as a modal Window that wants to reference values in the component it was launched from.

    Determination of the `ruleScope` happens when the component is first drawn.

    The component designated as the `ruleScope` manages a nested data structure called the "rule context" which contains information from all `DataBoundComponent`s that are registered with the `ruleScope`. By specifying `Criterion.fieldName` as a `DataPath`, AdvancedCriteria defined in properties such as `FormItem.visibleWhen` can access any part of the rule context.

    By default, the rule context contains data as follows:

    - any `DataBoundComponent` or ValuesManager that has a DataSource contributes the values of the selected record or record being edited under the ID of the DataSource. For any collision an editable display (such as a form or editable grid) wins over a static display (such as a non-editable grid with a selection.) Hidden or cleared components have lowest priority even if editable. For two editable components the first becomes the contributor.
    - any ListGrid or other component that manages a selection and has been assigned an explicit `ID` will contribute the values of the selected record under `<componentId>.selectedRecord`, the values of the grid summary record under `<componentId>.summaryRecord`, and also contributes 3 flags for checking for selection: `anySelected`, `multiSelected`, `numSelected`. The selected record can also be identified by row number: `<componentId>.selectedRowNum` which also applies to the edit row since editing implies selection by default.
    - any DynamicForm or other component that edits values and has been assigned an explicit `ID` contributes its current values under `<componentId>.values`, and contributes a flag `hasChanges`.
    - any DynamicForm or ListGrid that has been assigned an explicit `ID` contributes a value `<componentId>.focusField`. When present the value indicates the component has focus along with the name of the field that has focus. Its absense indicates the component does not have focus at all.
    - any ListGrid that has been assigned an explicit `ID` contributes a flag `isGrouped` under `<componentId>`.
    - any DataSource included in a `DataContext` or `testDataContext` that is being used for this ruleScope contributes the values into the `dataContext` section of the ruleContext (ex. `dataContext.Customer`) so the values do not conflict with normal DataSource contributions. Note that the `dataContext` is immutable so only the first contribution is actually saved.

    A `ValuesManager` contributes the DataSource-prefixed portion of ruleContext prior to the member forms. See additional ValuesManager information below.

    In addition to data contributed by DataBoundComponent, the ruleScope also contains entries contributed by the Authentication class, such as the authenticated userId and roles - see `Authentication` for details. Characteristics of the current device is also included as:

          {
           device : {
              isPhone : false,
              isTablet : false,
              isDesktop : true,
              isLandscape : true
           }
          }

    For example, given a screen where:

    - a ListGrid with ID "itemGrid" and DynamicForm with ID "itemForm" are both bound to the `supplyItem` sample DataSource
    - the ListGrid has a single selection, and the record selected in the ListGrid is being edited in the form, and has been changed
    The default rule context available from `getRuleContext()`, expressed as JSON, would be:

          {
           supplyItem : {
              itemID : "654321",
              itemName : "Sewing Machine",
              price : 5.50, // note: user change
              ..other properties..
           },
           itemForm.values : {
              itemID : "654321",
              itemName : "Sewing Machine",
              price : 5.50, // note: user change
              ..other properties..
           },
           itemForm.focusField : "itemName",
           itemForm.hasChanges : true,
           itemGrid.selectedRecord : {
              itemID : "654321",
              itemName : "Sewing Machine",
              price : 3.50, // note: old price
              ..other properties..
           },
           itemGrid.anySelected : true,
           itemGrid.multiSelected : false,
           itemGrid.numSelected : 1,
           itemGrid.isGrouped : false,
           device : {
              isPhone : false,
              isTablet : false,
              isDesktop : true,
              isLandscape : true
           },
           auth : {
              currentUser : {
                 userId: "lisa",
                 firstName: "Lisa",
                 lastName: "Admin",
                 roles: "admin",
                 ..other properties..
              },
              roles : ['admin'],
              isSuperUser : false
           }
          }

    In addition, an application can put custom data into the ruleScope via `provideRuleContext()`.

    #### ValuesManager and RuleContext

    `*WhenRules` in member forms of a ValuesManager using short-form field references (i.e. no prefix) apply to the particular member form. To reference field values outside of the form use the dataSource-prefixed path (e.g. Customer.email).

    ## Troubleshooting RuleScope issues

    The ruleScope system consists of two major parts: managing the rule context and using the rule context. The former is handled by `provideRuleContext()` and `removeRuleContext()`. Users of rule context are the criteria-based rules noted above.

    A number of Log categories are provided to make diagnosing ruleScope issues easier:

    - ruleContext
    - whenRules
    - dynamicProperties
    - dynamicCriteria
    Except for configuration warnings, nothing is logged for these categories unless the log priority is set to either Info or Debug. The priorities can be configured and the log messages reviewed in `Smart GWT Developer Console`. By default none of these categories are included in the `Logging Preferences` category choices. To add one or more of these categories, select `More...` then click `Add...`. Be sure to enter the category with the correct capitalization.

    At the Info log priority one or two basic log messages are generated per action. The Debug priority generally includes additional information like the full criteria or a message for each evaluation even when no change is made.

    ### Using and Interpreting log messages

    To address a specific issue on rules, select the Info priority for the target category in the Developer Console then perform your application actions that are being diagnosed. You may want to re-run your application to get a clean start on the changes.

    #### whenRules and dynamicProperties

    Both of these types of properties are triggered by a criteria that can reference the ruleContext and/or the component's values (for forms). The criteria is re-evaluated on each rule context change and based on the criteria being matched or not, the action is taken or property updated.

    Below are some example Info log messages:

          16:53:39.032:TMR8[E0]:INFO:whenRules:Hide Canvas 'isc_Canvas_1'
          16:53:39.034:TMR8[E1]:INFO:whenRules:Disabling Canvas 'isc_Button_3'
          16:53:39.509:TMR9[E0]:INFO:whenRules:Hide Canvas 'isc_Canvas_2'
          16:53:39.510:TMR9[E1]:INFO:whenRules:Hide Canvas 'isc_Button_4'
          16:53:39.527:TMR4:INFO:whenRules:Show Canvas 'isc_Canvas_2'
          16:53:39.527:TMR4:INFO:whenRules:Show Canvas 'isc_Button_4'
          16:53:39.528:TMR4:INFO:whenRules:Disabling Canvas 'isc_Button_4'
          16:53:39.529:TMR4:INFO:whenRules:Set read-only (appearance disabled) FormItem 'itemForm3.field2'
          16:53:39.974:TMR6:INFO:whenRules:Set editable (appearance disabled) FormItem 'itemForm3.field2'
          16:53:40.540:TMR2:INFO:whenRules:Enabling FormItemIcon 'itemForm4.field2.remove'
          16:53:40.541:TMR2:INFO:whenRules:Hide FormItemIcon 'itemForm4.field4.edit'

    These indicate various responses to `visibleWhen`, `enableWhen`, and `readOnlyWhen` actions.

    By setting the priority to Debug you can see the creation of the rule for the criteria and the evaluation of the criteria before action is taken:

          16:53:41.569:TMR7:DEBUG:whenRules:itemForm6:Create whenRule: itemForm6_field2_readOnly, applyWhen {
              "_constructor":"AdvancedCriteria",
              "operator":"and",
              "criteria":[
                  {
                      "fieldName":"layout1.date1",
                      "operator":"greaterOrEqualField",
                      "value":"layout1.date2"
                  }
              ]
          } to target {component: [DynamicForm ID:itemForm6], fieldName: "field2", formIconName: undef}
          16:53:41.571:TMR7:DEBUG:whenRules:isc_RulesEngine_5:Applying readOnly rule 'itemForm6_field2_readOnly' for FormItem itemForm6.field2 with action result true. applyWhen criteria matched: {
              "__normalized":true,
              "_constructor":"AdvancedCriteria",
              "operator":"and",
              "criteria":[
                  {
                      "__normalized":true,
                      "fieldName":"layout1.date1",
                      "operator":"greaterOrEqualField",
                      "value":"layout1.date2"
                  }
              ]
          }
          16:53:41.571:TMR7:DEBUG:whenRules:Set read-only (appearance disabled) FormItem 'itemForm6.field2'

    dynamicProperties are similar:

          16:59:13.588:XRP8:INFO:dynamicProperties:Set (populateFromDataPath) 'isc_Button_0.title' to [initial value]: Special Title
          16:59:13.650:TMR2:WARN:Class:isc_Class_0:Attempt to evaluate formulaFunction itemForm.values.count * 2 + 10 failed. Error message:undefined is not an object (evaluating 'itemForm.values')
          16:59:13.657:TMR9:INFO:dynamicProperties:Set (populate) 'isc_Class_0.contents' to [initial value]: 34

    This example shows a failed formula indicating that the 'itemForm.values' isn't valid in the ruleContext. In this case the form values haven't been provided to ruleContext yet. When they are the next log message shows the result.

    #### dynamicCriteria

    Each time a dynamic criteria is evaluated (as triggered by a `ruleContextChanged` event) a log entry is made:

          14:54:46.436:INP9:INFO:dynamicCriteria:isc_ListGrid_0:Evaluated dynamic criteria: filterCriteria

    This indicates that dynamicCriteria for isc_ListGrid_0 is being evaluated/re-evaluated. By changing the priority to Debug the resolved criteria is also included:

          14:55:16.231:INP9:DEBUG:dynamicCriteria:isc_ListGrid_0:Evaluated dynamic criteria: filterCriteria {
              "fieldName":"orderNumber",
              "operator":"equals",
              "valuePath":"orderSearchForm.values.orderNumber",
              "value":10104,
              "_constructor":"AdvancedCriteria"
          }

    Note the valuePath of `orderSearchForm.values.orderNumber` is resolved to the value of `10104`.

    #### ruleContext

    If none of the logging above provides details needed to understand what is going on, enabling the ruleContext category can be enabled. At Info a single log message is reported for each ruleContext change.

    For example, below are the rule context changes that occurred to trigger the above dynamicCriteria messages above:

          14:54:46.432:INP9:INFO:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0]: Order.orderNumber = 10104
          14:54:46.433:INP9:INFO:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0]: orderSearchForm.values.orderNumber = 10104
          14:54:46.434:INP9:INFO:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0]: orderSearchForm.hasChanges = true

    This indicates that isc_SearchForm_0 updated rule context with three changed values. There is no indication of when a `ruleContextChanged` event is raised. If that is important, change the log priority to Debug to see more details:

          15:16:43.291:INP9:DEBUG:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0] START TRANSACTION
          15:16:43.292:INP9:DEBUG:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0]: Order.orderNumber = 10104
          15:16:43.292:INP9:DEBUG:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0]: orderSearchForm.values.orderNumber = 10104
          15:16:43.293:INP9:DEBUG:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0]: orderSearchForm.hasChanges = true
          15:16:43.294:INP9:DEBUG:ruleContext:isc_SearchForm_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_SearchForm_0] END TRANSACTION

    Here the isc_SearchForm_0 provides rule context changes as part of a 'transaction'. That is, the three values are provided separately but a single `ruleContextChanged` event is raised at the end of the 'transaction'. If only one change is part of a 'transaction' the start/end log messages are suppressed. For example, the isc_ListGrid_0 updates rule context as a result of the change in the dynamic criteria. The criteria is provided to rule context separately from `dataLoading` updates:

          15:16:43.305:INP9:DEBUG:ruleContext:isc_ListGrid_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_ListGrid_0]: orderDetailGrid.criteria = {fieldName: "orderNumber",
                       operator: "equals", valuePath: "orderSearchForm.values.orderNumber", value: 10104, _constructor: "AdvancedCriteria"}
          15:16:43.317:INP9:DEBUG:ruleContext:isc_ListGrid_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_ListGrid_0]: orderDetailGrid.dataLoading = true
          15:16:44.228:TMR2:DEBUG:ruleContext:isc_ListGrid_0:provideRuleContext [ruleScope: isc_DataView_0, dbcID: isc_ListGrid_0]: orderDetailGrid.dataLoading = null

    Returns:
      Current ruleScope value. Default value is null

  - ### setScrollbarConstructor

    public Canvas setScrollbarConstructor(String scrollbarConstructor) throws IllegalStateException
    The class that will be used to create custom scrollbars for this component. Set this attribute to a Scrollbar subclass with e.g. a different skinImgDir, to customize scrollbar appearance for this component only.

    When `spriting is enabled` and supported by the skin, the default `scrollbarConstructor` is changed to a different scrollbar class which handles scrollbar spriting. Spriting of the scrollbars of an individual component can therefore be disabled by creating the component with `scrollbarConstructor` set to the "Scrollbar" class. "Scrollbar" is a basic scrollbar class that does not employ spriting.

    Note: This setting may be ignored if `nativeAutoHideScrollbars` is enabled - see that setting for details.

    Note : This is an advanced setting

    Parameters:
      `scrollbarConstructor` - New scrollbarConstructor value. Default value is "Scrollbar"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `setNativeAutoHideScrollbars(java.lang.Boolean)`
      - `Scrolling overview and related methods`

  - ### setScrollbarSize

    public Canvas setScrollbarSize(int scrollbarSize)
    How thick should we make the scrollbars for this canvas. This only applies if `showCustomScrollbars` is `true`.

    NOTE: When `spriting is enabled`, changing the `scrollbarSize` may cause tiling of certain images and backgrounds that make up the custom scrollbar. This can be fixed for a component by creating it with `scrollbarConstructor` set to "Scrollbar"—a basic scrollbar class that does not employ spriting.

    Note : This is an advanced setting

    Parameters:
      `scrollbarSize` - New scrollbarSize value. Default value is 16
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `getScrollbarSize()`
      - `Scrolling overview and related methods`

  - ### getScrollbarSize

    public int getScrollbarSize()
    How thick should we make the scrollbars for this canvas. This only applies if `showCustomScrollbars` is `true`.

    NOTE: When `spriting is enabled`, changing the `scrollbarSize` may cause tiling of certain images and backgrounds that make up the custom scrollbar. This can be fixed for a component by creating it with `scrollbarConstructor` set to "Scrollbar"—a basic scrollbar class that does not employ spriting.

    Returns:
      Returns the thickness of this widget's scrollbars.
      For canvases showing custom scrollbars this is determined from `this.scrollbarSize`. Default value is 16
    See Also:
      - `getScrollbarSize()`
      - `Scrolling overview and related methods`

  - ### setShadowColor

    public Canvas setShadowColor(String shadowColor)
    Color for the css-based drop shadow shown if `useCSSShadow` is true and `showShadow` is true.

    Has no effect if we are not using css-based shadows - in that case, use `shadowImage` instead.

    Note : This is an advanced setting

    Parameters:
      `shadowColor` - New shadowColor value. Default value is "#AAAAAA"
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `CSSColor`

  - ### getShadowColor

    public String getShadowColor()
    Color for the css-based drop shadow shown if `useCSSShadow` is true and `showShadow` is true.

    Has no effect if we are not using css-based shadows - in that case, use `shadowImage` instead.

    Returns:
      Current shadowColor value. Default value is "#AAAAAA"
    See Also:
      - `CSSColor`

  - ### setShadowDepth

    public Canvas setShadowDepth(int shadowDepth) throws IllegalStateException
    Depth of the shadow, or the virtual height above the page of the widget throwing the shadow.

    This is a single parameter that can be used to control both `shadowSoftness` and `shadowOffset`.

    Parameters:
      `shadowDepth` - New shadowDepth value. Default value is 4
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getShadowDepth

    public int getShadowDepth()
    Depth of the shadow, or the virtual height above the page of the widget throwing the shadow.

    This is a single parameter that can be used to control both `shadowSoftness` and `shadowOffset`.

    Returns:
      Current shadowDepth value. Default value is 4

  - ### setShadowHOffset

    public Canvas setShadowHOffset(Integer shadowHOffset)
    Horizontal offset for the `shadow`. Takes precedence over `shadowOffset` if set. Has no effect if `css-shadows` are not being used for this canvas.

    Note : This is an advanced setting

    Parameters:
      `shadowHOffset` - New shadowHOffset value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getShadowHOffset

    public Integer getShadowHOffset()
    Horizontal offset for the `shadow`. Takes precedence over `shadowOffset` if set. Has no effect if `css-shadows` are not being used for this canvas.
    Returns:
      Current shadowHOffset value. Default value is null

  - ### setShadowImage

    public Canvas setShadowImage(String shadowImage) throws IllegalStateException
    If `useCSSShadow` is false, (or for browsers that do not support css3), this property supplies the base name of the series of images for the sides, corners, and center of the shadow.

    The actual image names fetched for the dropShadow combine the segment name and the `shadowDepth` setting. For example, given "ds.png" as the base name, a depth of 4, and the top-left segment of the shadow, we'd use "ds4_TL.png".

    The names for segments are the same as those given for controlling resizable edges; see `resizeFrom`. The center segment has the name "center". The center segment is the only segment that doesn't include the depth in the URL, so the final image name for the center given a baseName of "ds.png" would be just "ds_center.png".

    Note : This is an advanced setting

    Parameters:
      `shadowImage` - New shadowImage value. Default value is "[SKIN]ds.png"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `SCImgURL`

  - ### getShadowImage

    public String getShadowImage()
    If `useCSSShadow` is false, (or for browsers that do not support css3), this property supplies the base name of the series of images for the sides, corners, and center of the shadow.

    The actual image names fetched for the dropShadow combine the segment name and the `shadowDepth` setting. For example, given "ds.png" as the base name, a depth of 4, and the top-left segment of the shadow, we'd use "ds4_TL.png".

    The names for segments are the same as those given for controlling resizable edges; see `resizeFrom`. The center segment has the name "center". The center segment is the only segment that doesn't include the depth in the URL, so the final image name for the center given a baseName of "ds.png" would be just "ds_center.png".

    Returns:
      Current shadowImage value. Default value is "[SKIN]ds.png"
    See Also:
      - `SCImgURL`

  - ### setShadowOffset

    public Canvas setShadowOffset(Integer shadowOffset)
    Offset of the shadow. Defaults to half of `shadowDepth` if unset.

    Because of the blurred edges, a shadow is larger than the originating component by 2xsoftness. An `shadowOffset` of 0 means that the shadow will extend around the originating component equally in all directions.

    If `css shadows` are being used, separate vertical and horizontal offsets may be specified via `shadowHOffset` and `shadowVOffset`.

    Note : This is an advanced setting

    Parameters:
      `shadowOffset` - New shadowOffset value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - Shadows Example

  - ### getShadowOffset

    public Integer getShadowOffset()
    Offset of the shadow. Defaults to half of `shadowDepth` if unset.

    Because of the blurred edges, a shadow is larger than the originating component by 2xsoftness. An `shadowOffset` of 0 means that the shadow will extend around the originating component equally in all directions.

    If `css shadows` are being used, separate vertical and horizontal offsets may be specified via `shadowHOffset` and `shadowVOffset`.

    Returns:
      Current shadowOffset value. Default value is null
    See Also:
      - Shadows Example

  - ### setShadowSoftness

    public Canvas setShadowSoftness(Integer shadowSoftness)
    Softness, or degree of blurring, of the shadow.

    A shadow with `softness:x` is 2x pixels larger in each direction than the element throwing the shadow, and the media for each edge should be x pixels wide/tall.

    Defaults to `shadowDepth` if unset.

    Note : This is an advanced setting

    Parameters:
      `shadowSoftness` - New shadowSoftness value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - Shadows Example

  - ### getShadowSoftness

    public Integer getShadowSoftness()
    Softness, or degree of blurring, of the shadow.

    A shadow with `softness:x` is 2x pixels larger in each direction than the element throwing the shadow, and the media for each edge should be x pixels wide/tall.

    Defaults to `shadowDepth` if unset.

    Returns:
      Current shadowSoftness value. Default value is null
    See Also:
      - Shadows Example

  - ### setShadowSpread

    public Canvas setShadowSpread(Integer shadowSpread)
    Explicit spread for the css-based drop shadow shown if `useCSSShadow` is true and `showShadow` is true. This property governs how much larger than the widget the shadow will appear. A negative value (coupled with an explicit offset) will result in a smaller shadow.

    Has no effect if we are not using css-based shadows - in that case, use `shadowImage` instead.

    Note : This is an advanced setting

    Parameters:
      `shadowSpread` - New shadowSpread value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getShadowSpread

    public Integer getShadowSpread()
    Explicit spread for the css-based drop shadow shown if `useCSSShadow` is true and `showShadow` is true. This property governs how much larger than the widget the shadow will appear. A negative value (coupled with an explicit offset) will result in a smaller shadow.

    Has no effect if we are not using css-based shadows - in that case, use `shadowImage` instead.

    Returns:
      Current shadowSpread value. Default value is null

  - ### setShadowVOffset

    public Canvas setShadowVOffset(Integer shadowVOffset)
    Vertical offset for the `shadow`. Takes precedence over `shadowOffset` if set. Has no effect if `css-shadows` are not being used for this canvas.

    Note : This is an advanced setting

    Parameters:
      `shadowVOffset` - New shadowVOffset value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getShadowVOffset

    public Integer getShadowVOffset()
    Vertical offset for the `shadow`. Takes precedence over `shadowOffset` if set. Has no effect if `css-shadows` are not being used for this canvas.
    Returns:
      Current shadowVOffset value. Default value is null

  - ### setShouldPrint

    public Canvas setShouldPrint(Boolean shouldPrint)
    Whether this canvas should be included in a printable view.

    Default is to:

    - omit all peers (edges generated by showEdges:true, etc)
    - omit anything considered a "control", such as a button or menu (see `PrintProperties.omitControls`)
    - include everything else not marked shouldPrint:false
    Parameters:
      `shouldPrint` - New shouldPrint value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Printing`

  - ### getShouldPrint

    public Boolean getShouldPrint()
    Whether this canvas should be included in a printable view.

    Default is to:

    - omit all peers (edges generated by showEdges:true, etc)
    - omit anything considered a "control", such as a button or menu (see `PrintProperties.omitControls`)
    - include everything else not marked shouldPrint:false
    Returns:
      Current shouldPrint value. Default value is null
    See Also:
      - `Printing`

  - ### setShowCustomScrollbars

    public Canvas setShowCustomScrollbars(boolean showCustomScrollbars) throws IllegalStateException
    Whether to use the browser's native scrollbars or Smart GWT-based scrollbars.

    Smart GWT-based scrollbars are skinnable, giving you complete control over look and feel. Smart GWT-based scrollbars also enable some interactions not possible with native scrollbars, such as `variable height records` in grids in combination with `data paging`.

    Native browser scrollbars are slightly faster simply because there are less Smart GWT components that need to be created, drawn and updated. Each visible Smart GWT-based scrollbar on the screen has roughly the impact of two StretchImgButtons.

    Smart GWT is always aware of the size of the scrollbar, regardless of whether native or custom scrollbars are used, and regardless of what operating system and/or operating system "theme" or "skin" is in use. This means Smart GWT will correctly report the `viewport size`, that is, the interior area of the widget excluding space taken by scrollbars, which is key for exactly filling a component with content without creating unnecessary scrolling.

    The `showCustomScrollbars` setting is typically overridden in load_skin.js in order to change the default for all Smart GWT components at once. This may be achieved via the static `setDefaultShowCustomScrollbars(boolean)` method or calling setProperty() , like so:

               Canvas canvas = new Canvas();
               canvas.setProperty("showCustomScrollbars", false);

    On `touch devices`, custom scrollbars are disabled in favor of enabling native touch scrolling if available. However, custom scrollbars and native touch scrolling can be enabled for the component by setting `alwaysShowScrollbars` to `true`.

    Note: This setting may be ignored if `nativeAutoHideScrollbars` is enabled - see that setting for details.

    Note : This is an advanced setting

    Parameters:
      `showCustomScrollbars` - New showCustomScrollbars value. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `setReceiveScrollbarEvents(boolean)`
      - `setNativeAutoHideScrollbars(java.lang.Boolean)`
      - `Scrolling overview and related methods`

  - ### getShowCustomScrollbars

    public boolean getShowCustomScrollbars()
    Whether to use the browser's native scrollbars or Smart GWT-based scrollbars.

    Smart GWT-based scrollbars are skinnable, giving you complete control over look and feel. Smart GWT-based scrollbars also enable some interactions not possible with native scrollbars, such as `variable height records` in grids in combination with `data paging`.

    Native browser scrollbars are slightly faster simply because there are less Smart GWT components that need to be created, drawn and updated. Each visible Smart GWT-based scrollbar on the screen has roughly the impact of two StretchImgButtons.

    Smart GWT is always aware of the size of the scrollbar, regardless of whether native or custom scrollbars are used, and regardless of what operating system and/or operating system "theme" or "skin" is in use. This means Smart GWT will correctly report the `viewport size`, that is, the interior area of the widget excluding space taken by scrollbars, which is key for exactly filling a component with content without creating unnecessary scrolling.

    The `showCustomScrollbars` setting is typically overridden in load_skin.js in order to change the default for all Smart GWT components at once. This may be achieved via the static `setDefaultShowCustomScrollbars(boolean)` method or calling setProperty() , like so:

               Canvas canvas = new Canvas();
               canvas.setProperty("showCustomScrollbars", false);

    On `touch devices`, custom scrollbars are disabled in favor of enabling native touch scrolling if available. However, custom scrollbars and native touch scrolling can be enabled for the component by setting `alwaysShowScrollbars` to `true`.

    Note: This setting may be ignored if `nativeAutoHideScrollbars` is enabled - see that setting for details.

    Returns:
      Current showCustomScrollbars value. Default value is true
    See Also:
      - `getReceiveScrollbarEvents()`
      - `getNativeAutoHideScrollbars()`
      - `Scrolling overview and related methods`

  - ### setShowDragShadow

    public Canvas setShowDragShadow(Boolean showDragShadow)
    When this widget is dragged, if its dragAppearance is `"target"`, should we show a shadow behind the canvas during the drag.

    Note : This is an advanced setting

    Parameters:
      `showDragShadow` - New showDragShadow value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`
      - Drag effects Example

  - ### getShowDragShadow

    public Boolean getShowDragShadow()
    When this widget is dragged, if its dragAppearance is `"target"`, should we show a shadow behind the canvas during the drag.
    Returns:
      Current showDragShadow value. Default value is null
    See Also:
      - `Drag and Drop`
      - Drag effects Example

  - ### setShowEdges

    public Canvas setShowEdges(Boolean showEdges) throws IllegalStateException
    Whether an `EdgedCanvas` should be used to show image-based edges around this component.
    Parameters:
      `showEdges` - New showEdges value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - Edges Example

  - ### getShowEdges

    public Boolean getShowEdges()
    Whether an `EdgedCanvas` should be used to show image-based edges around this component.
    Returns:
      Current showEdges value. Default value is false
    See Also:
      - Edges Example

  - ### setShowFocusOutline

    public Canvas setShowFocusOutline(boolean showFocusOutline)
    For focusable widgets, should the native dotted focus outline be shown, where supported?

    This controls whether the browser's default focus outline (typically a dotted border) is displayed when the widget has keyboard focus. Set to false to suppress this outline, for example when custom focus styling is applied via `showFocused`.

    Note : This is an advanced setting

    Parameters:
      `showFocusOutline` - New showFocusOutline value. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Focus`

  - ### getShowFocusOutline

    public boolean getShowFocusOutline()
    For focusable widgets, should the native dotted focus outline be shown, where supported?

    This controls whether the browser's default focus outline (typically a dotted border) is displayed when the widget has keyboard focus. Set to false to suppress this outline, for example when custom focus styling is applied via `showFocused`.

    Returns:
      Current showFocusOutline value. Default value is true
    See Also:
      - `Focus`

  - ### setShowHover

    public Canvas setShowHover(Boolean showHover)
    If `this.canHover` is true, should we show the global hover canvas by default when the user hovers over this canvas?
    Parameters:
      `showHover` - New showHover value. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `getHoverHTML()`

  - ### getShowHover

    public Boolean getShowHover()
    If `this.canHover` is true, should we show the global hover canvas by default when the user hovers over this canvas?
    Returns:
      Current showHover value. Default value is true
    See Also:
      - `getHoverHTML()`

  - ### setShowHoverComponents

    public Canvas setShowHoverComponents(Boolean showHoverComponents)
    When set to true, shows a widget hovering at the mouse point instead of the builtin hover label. Override `getHoverComponent` to provide the Canvas to show as the hoverComponent.

    Note : This is an advanced setting

    Parameters:
      `showHoverComponents` - New showHoverComponents value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getShowHoverComponents

    public Boolean getShowHoverComponents()
    When set to true, shows a widget hovering at the mouse point instead of the builtin hover label. Override `getHoverComponent` to provide the Canvas to show as the hoverComponent.
    Returns:
      Current showHoverComponents value. Default value is false

  - ### setShowPointer

    public Canvas setShowPointer(Boolean showPointer)
    Should a pointer be shown? A pointer can be placed on the border to identify the target of the canvas contents. The default position for the pointer is top-right. The position and additional properties of the pointer is specified by `pointerSettings`.

    If a `pointerTarget` is specified, `showPointer` will be enabled unless it is explicitly set to `false`.
    If this method is called after the component has been drawn/initialized: Set the showPointer property.

    Parameters:
      `showPointer` - New showPointer value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getShowPointer

    public Boolean getShowPointer()
    Should a pointer be shown? A pointer can be placed on the border to identify the target of the canvas contents. The default position for the pointer is top-right. The position and additional properties of the pointer is specified by `pointerSettings`.

    If a `pointerTarget` is specified, `showPointer` will be enabled unless it is explicitly set to `false`.

    Returns:
      Current showPointer value. Default value is null

  - ### setShowResizeBar

    public Canvas setShowResizeBar(Boolean showResizeBar)
    When this Canvas is included as a member in a `Layout`, whether a resizeBar should be shown after this member in the layout, to allow it to be resized.

    Whether a resizeBar is actually shown also depends on the `defaultResizeBars` attribute of the layout, and whether this Canvas is the last layout member.

    By default the resize bar acts on the Canvas that it is declared on. If you want the resize bar to instead act on the next member of the Layout (e.g. to collapse down or to the right), set `resizeBarTarget` as well.
    If this method is called after the component has been drawn/initialized: When this Canvas is included as a member in a `Layout`, dynamically updates whether a resizeBar should be shown after this member in the layout, to allow it to be resized.

    Whether a resizeBar is actually shown also depends on the `defaultResizeBars` attribute of the layout, and whether this Canvas is the last layout member.

    Parameters:
      `showResizeBar` - setting for this.showResizeBar. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setResizeBarTarget(java.lang.String)`
      - `Layout.setDefaultResizeBars(com.smartgwt.client.types.LayoutResizeBarPolicy)`
      - `LayoutMember overview and related methods`
      - Nesting Example

  - ### getShowResizeBar

    public Boolean getShowResizeBar()
    When this Canvas is included as a member in a `Layout`, whether a resizeBar should be shown after this member in the layout, to allow it to be resized.

    Whether a resizeBar is actually shown also depends on the `defaultResizeBars` attribute of the layout, and whether this Canvas is the last layout member.

    By default the resize bar acts on the Canvas that it is declared on. If you want the resize bar to instead act on the next member of the Layout (e.g. to collapse down or to the right), set `resizeBarTarget` as well.

    Returns:
      Current showResizeBar value. Default value is false
    See Also:
      - `getResizeBarTarget()`
      - `Layout.getDefaultResizeBars()`
      - `LayoutMember overview and related methods`
      - Nesting Example

  - ### setShowShadow

    public Canvas setShowShadow(Boolean showShadow)
    Whether to show a drop shadow for this Canvas.

    Shadows may be rendered using `css` or via images. The appearance of shadows can be customized via `shadowColor` (for css-based shadows) or `shadowImage` (for image based shadows), `shadowDepth`, `shadowOffset` and `shadowSoftness`.

    When `useCSSShadow` is false, developers should be aware that the drop shadow is rendered as a `peer` and is drawn outside the specified width and height of the widget meaning a widget with shadows takes up a little more space than it otherwise would. A full screen canvas with showShadow set to true as this would be likely to cause browser scrollbars to appear - developers can handle this by either setting this property to false on full-screen widgets, or by setting overflow to "hidden" on the <body> element if browser-level scrolling is never intended to occur.
    If this method is called after the component has been drawn/initialized: Method to update `showShadow`.

    Parameters:
      `showShadow` - true if the shadow should be visible false if not. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - Shadows Example

  - ### getShowShadow

    public Boolean getShowShadow()
    Whether to show a drop shadow for this Canvas.

    Shadows may be rendered using `css` or via images. The appearance of shadows can be customized via `shadowColor` (for css-based shadows) or `shadowImage` (for image based shadows), `shadowDepth`, `shadowOffset` and `shadowSoftness`.

    When `useCSSShadow` is false, developers should be aware that the drop shadow is rendered as a `peer` and is drawn outside the specified width and height of the widget meaning a widget with shadows takes up a little more space than it otherwise would. A full screen canvas with showShadow set to true as this would be likely to cause browser scrollbars to appear - developers can handle this by either setting this property to false on full-screen widgets, or by setting overflow to "hidden" on the <body> element if browser-level scrolling is never intended to occur.

    Returns:
      Current showShadow value. Default value is false
    See Also:
      - Shadows Example

  - ### setShowSnapGrid

    public Canvas setShowSnapGrid(Boolean showSnapGrid)
    Whether to show a snap grid for this Canvas. Note that the grid is only shown when either `childrenSnapToGrid` or `childrenSnapResizeToGrid` is `true`.

    Grid is based on `snapHGap` and `snapVGap` properties.
    If this method is called after the component has been drawn/initialized: Set the showSnapGrid property.

    Parameters:
      `showSnapGrid` - New showSnapGrid value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getShowSnapGrid

    public Boolean getShowSnapGrid()
    Whether to show a snap grid for this Canvas. Note that the grid is only shown when either `childrenSnapToGrid` or `childrenSnapResizeToGrid` is `true`.

    Grid is based on `snapHGap` and `snapVGap` properties.

    Returns:
      Current showSnapGrid value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setShrinkElementOnHide

    public Canvas setShrinkElementOnHide(boolean shrinkElementOnHide)
    This is an advanced setting. If set to `true`, when a widget is `hidden`, the widget's handle will be resized such that it takes up no space, in addition to having its css `visibility` property set to `"hidden"`.

    In addition to preventing the size of this widget from impacting the `scroll size` of any parent widget while hidden, this setting works around a native bug observed in Internet Explorer 10, whereby an `<IFRAME>` element with visibility set to hidden can cause rendering problems, if the HTML loaded by the `<IFRAME>` contains a `<frameset>`. In this case the browser may refuse to draw other elements at the same coordinates with a lower z-index than the hidden frame. Setting this property to `true` works around this problem for cases where an `<IFRAME>` containing a `<frameset` will be rendered out, for example in an `HTMLFlow` with `contentsType` set to `"page"`.

    Note : This is an advanced setting

    Parameters:
      `shrinkElementOnHide` - New shrinkElementOnHide value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Visibility overview and related methods`

  - ### getShrinkElementOnHide

    public boolean getShrinkElementOnHide()
    This is an advanced setting. If set to `true`, when a widget is `hidden`, the widget's handle will be resized such that it takes up no space, in addition to having its css `visibility` property set to `"hidden"`.

    In addition to preventing the size of this widget from impacting the `scroll size` of any parent widget while hidden, this setting works around a native bug observed in Internet Explorer 10, whereby an `<IFRAME>` element with visibility set to hidden can cause rendering problems, if the HTML loaded by the `<IFRAME>` contains a `<frameset>`. In this case the browser may refuse to draw other elements at the same coordinates with a lower z-index than the hidden frame. Setting this property to `true` works around this problem for cases where an `<IFRAME>` containing a `<frameset` will be rendered out, for example in an `HTMLFlow` with `contentsType` set to `"page"`.

    Returns:
      Current shrinkElementOnHide value. Default value is false
    See Also:
      - `Visibility overview and related methods`

  - ### setSizeMayChangeOnRedraw

    public Canvas setSizeMayChangeOnRedraw(Boolean sizeMayChangeOnRedraw)
    Is it possible that a call to `redraw()` on this widget will change its size?

    Used by framework layout code when determining whether a component which has been `marked as dirty` needs an immediate redraw to determine its drawn size.

    If unset, default behavior assumes any component with overflow set to "visible" may change size on redraw, and any component with overflow set to "hidden", "scroll", or "auto" will not. This property overrides that behavior, and may be used to indicate that some component with non visible overflow can change size on redraw. An example use case would be a custom component with an override to explicitly resize the component as part of the redraw() flow.

    Note : This is an advanced setting

    Parameters:
      `sizeMayChangeOnRedraw` - New sizeMayChangeOnRedraw value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getSizeMayChangeOnRedraw

    public Boolean getSizeMayChangeOnRedraw()
    Is it possible that a call to `redraw()` on this widget will change its size?

    Used by framework layout code when determining whether a component which has been `marked as dirty` needs an immediate redraw to determine its drawn size.

    If unset, default behavior assumes any component with overflow set to "visible" may change size on redraw, and any component with overflow set to "hidden", "scroll", or "auto" will not. This property overrides that behavior, and may be used to indicate that some component with non visible overflow can change size on redraw. An example use case would be a custom component with an override to explicitly resize the component as part of the redraw() flow.

    Returns:
      Current sizeMayChangeOnRedraw value. Default value is null

  - ### setSkinImgDir

    public Canvas setSkinImgDir(String skinImgDir)
    Default directory for skin images (those defined by the class), relative to the Page-wide `skinDir`.

    Note : This is an advanced setting

    Parameters:
      `skinImgDir` - New skinImgDir value. Default value is "images/"
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SCImgURL`
      - `Images overview and related methods`

  - ### getSkinImgDir

    public String getSkinImgDir()
    Default directory for skin images (those defined by the class), relative to the Page-wide `skinDir`.
    Returns:
      Current skinImgDir value. Default value is "images/"
    See Also:
      - `SCImgURL`
      - `Images overview and related methods`

  - ### setSnapAlignCandidates

    public Canvas setSnapAlignCandidates(Canvas... snapAlignCandidates)
    When `childrenSnapAlign` is enabled, list of candidates to check for alignment.

    If a list of `snapAlignCandidates` is never provided, the default is to use all children that are not explicitly excluded via `isSnapAlignCandidate`, including automatically adding newly added children as candidates, and ignoring children that have been removed. Use `addSnapAlignCandidate()` and `removeSnapAlignCandidate()` to add and remove special candidates while retaining all children as default candidates.

    Possible candidates which are not drawn or are hidden are automatically ignored.

    Parameters:
      `snapAlignCandidates` - New snapAlignCandidates value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getSnapAlignCandidates

    public Canvas[] getSnapAlignCandidates()
    When `childrenSnapAlign` is enabled, list of candidates to check for alignment.

    If a list of `snapAlignCandidates` is never provided, the default is to use all children that are not explicitly excluded via `isSnapAlignCandidate`, including automatically adding newly added children as candidates, and ignoring children that have been removed. Use `addSnapAlignCandidate()` and `removeSnapAlignCandidate()` to add and remove special candidates while retaining all children as default candidates.

    Possible candidates which are not drawn or are hidden are automatically ignored.

    Returns:
      Current snapAlignCandidates value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setSnapAlignCenterLineStyle

    public Canvas setSnapAlignCenterLineStyle(String snapAlignCenterLineStyle) throws IllegalStateException
    CSS border declaration used for the line shown to indicate snapping to a center line when `childrenSnapAlign` is set.
    Parameters:
      `snapAlignCenterLineStyle` - New snapAlignCenterLineStyle value. Default value is "1px solid blue"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getSnapAlignCenterLineStyle

    public String getSnapAlignCenterLineStyle()
    CSS border declaration used for the line shown to indicate snapping to a center line when `childrenSnapAlign` is set.
    Returns:
      Current snapAlignCenterLineStyle value. Default value is "1px solid blue"
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setSnapAlignEdgeLineStyle

    public Canvas setSnapAlignEdgeLineStyle(String snapAlignEdgeLineStyle) throws IllegalStateException
    CSS border declaration used for the line shown to indicate snapping to a edge line when `childrenSnapAlign` is set.
    Parameters:
      `snapAlignEdgeLineStyle` - New snapAlignEdgeLineStyle value. Default value is "1px solid #555555"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getSnapAlignEdgeLineStyle

    public String getSnapAlignEdgeLineStyle()
    CSS border declaration used for the line shown to indicate snapping to a edge line when `childrenSnapAlign` is set.
    Returns:
      Current snapAlignEdgeLineStyle value. Default value is "1px solid #555555"
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setSnapAxis

    public Canvas setSnapAxis(String snapAxis)
    Describes which axes to apply snap-to-grid to. Valid values are "horizontal", "vertical" or "both".
    Parameters:
      `snapAxis` - New snapAxis value. Default value is "both"
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setSnapToGrid(java.lang.Boolean)`
      - `setSnapResizeToGrid(java.lang.Boolean)`
      - `setChildrenSnapToGrid(java.lang.Boolean)`
      - `setChildrenSnapResizeToGrid(java.lang.Boolean)`
      - `SnapGridDragging overview and related methods`

  - ### getSnapAxis

    public String getSnapAxis()
    Describes which axes to apply snap-to-grid to. Valid values are "horizontal", "vertical" or "both".
    Returns:
      Current snapAxis value. Default value is "both"
    See Also:
      - `getSnapToGrid()`
      - `getSnapResizeToGrid()`
      - `getChildrenSnapToGrid()`
      - `getChildrenSnapResizeToGrid()`
      - `SnapGridDragging overview and related methods`

  - ### setSnapEdge

    public Canvas setSnapEdge(String snapEdge)
    If `snapTo` is defined to this widget, this property can be used to define which edge of this widget should be snapped to an edge of the master or parent element.

    If unspecified the, default snapTo behavior is set up to align the "snapTo" edge of this widget with the snapTo edge of the master or parent.
    If this method is called after the component has been drawn/initialized: Set the snapEdge property of this canvas, and handle repositioning.

    Parameters:
      `snapEdge` - new snapEdge value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setSnapTo(java.lang.String)`
      - `SnapPositioning overview and related methods`

  - ### getSnapEdge

    public String getSnapEdge()
    If `snapTo` is defined to this widget, this property can be used to define which edge of this widget should be snapped to an edge of the master or parent element.

    If unspecified the, default snapTo behavior is set up to align the "snapTo" edge of this widget with the snapTo edge of the master or parent.

    Returns:
      Return the snapEdge value of this object. Default value is null
    See Also:
      - `getSnapTo()`
      - `SnapPositioning overview and related methods`

  - ### setSnapGridLineProperties

    public Canvas setSnapGridLineProperties(DrawLine snapGridLineProperties) throws IllegalStateException
    Specifies line styling to use when drawing the grid of lines for `SnapGridStyle`: "lines".
    Parameters:
      `snapGridLineProperties` - New snapGridLineProperties value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `SnapGridDragging overview and related methods`
      - `SGWTProperties`

  - ### getSnapGridLineProperties

    public DrawLine getSnapGridLineProperties()
    Specifies line styling to use when drawing the grid of lines for `SnapGridStyle`: "lines".
    Returns:
      Current snapGridLineProperties value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setSnapGridStyle

    public Canvas setSnapGridStyle(SnapGridStyle snapGridStyle) throws IllegalStateException
    Specifies indication style to use for snap points, either a grid of lines or an array of crosses. The lines can be configured using the property `snapGridLineProperties`.
    Parameters:
      `snapGridStyle` - New snapGridStyle value. Default value is "crosses"
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getSnapGridStyle

    public SnapGridStyle getSnapGridStyle()
    Specifies indication style to use for snap points, either a grid of lines or an array of crosses. The lines can be configured using the property `snapGridLineProperties`.
    Returns:
      Current snapGridStyle value. Default value is "crosses"
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setSnapHDirection

    public Canvas setSnapHDirection(String snapHDirection)
    The horizontal snap direction. Set this value to "before" to snap to the nearest gridpoint to the left; set it to "after" to snap to the nearest gridpoint to the right; and set it to "nearest" to snap to the nearest gridpoint in either direction.
    Parameters:
      `snapHDirection` - New snapHDirection value. Default value is "after"
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setSnapToGrid(java.lang.Boolean)`
      - `setSnapResizeToGrid(java.lang.Boolean)`
      - `setChildrenSnapToGrid(java.lang.Boolean)`
      - `setChildrenSnapResizeToGrid(java.lang.Boolean)`
      - `SnapGridDragging overview and related methods`

  - ### getSnapHDirection

    public String getSnapHDirection()
    The horizontal snap direction. Set this value to "before" to snap to the nearest gridpoint to the left; set it to "after" to snap to the nearest gridpoint to the right; and set it to "nearest" to snap to the nearest gridpoint in either direction.
    Returns:
      Current snapHDirection value. Default value is "after"
    See Also:
      - `getSnapToGrid()`
      - `getSnapResizeToGrid()`
      - `getChildrenSnapToGrid()`
      - `getChildrenSnapResizeToGrid()`
      - `SnapGridDragging overview and related methods`

  - ### setSnapHGap

    public Canvas setSnapHGap(int snapHGap)
    The horizontal grid size to use, in pixels, when snap-to-grid is enabled.
    Parameters:
      `snapHGap` - New snapHGap value. Default value is 20
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setSnapToGrid(java.lang.Boolean)`
      - `setSnapResizeToGrid(java.lang.Boolean)`
      - `setChildrenSnapToGrid(java.lang.Boolean)`
      - `setChildrenSnapResizeToGrid(java.lang.Boolean)`
      - `SnapGridDragging overview and related methods`

  - ### getSnapHGap

    public int getSnapHGap()
    The horizontal grid size to use, in pixels, when snap-to-grid is enabled.
    Returns:
      Current snapHGap value. Default value is 20
    See Also:
      - `getSnapToGrid()`
      - `getSnapResizeToGrid()`
      - `getChildrenSnapToGrid()`
      - `getChildrenSnapResizeToGrid()`
      - `SnapGridDragging overview and related methods`

  - ### setSnapOffsetLeft

    public Canvas setSnapOffsetLeft(Integer snapOffsetLeft)
    If `snapTo` is defined for this widget, this property can be used to specify an offset in px or percentage for the left coordinate of this widget.

    For example if `snapTo` is specified as `"L"` and `snapOffsetLeft` is set to 6, this widget will be rendered 6px inside the left edge of its parent or master element. Alternatively if `snapTo` was set to `"R"`, a `snapOffsetLeft` value of -6 would cause the component to be rendered 6px inside the right edge of its parent or `master canvas`.
    If this method is called after the component has been drawn/initialized: Setter for `snapOffsetLeft`.

    Parameters:
      `snapOffsetLeft` - new snapOffsetLeft value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setSnapTo(java.lang.String)`
      - `SnapPositioning overview and related methods`

  - ### getSnapOffsetLeft

    public Integer getSnapOffsetLeft()
    If `snapTo` is defined for this widget, this property can be used to specify an offset in px or percentage for the left coordinate of this widget.

    For example if `snapTo` is specified as `"L"` and `snapOffsetLeft` is set to 6, this widget will be rendered 6px inside the left edge of its parent or master element. Alternatively if `snapTo` was set to `"R"`, a `snapOffsetLeft` value of -6 would cause the component to be rendered 6px inside the right edge of its parent or `master canvas`.

    Returns:
      Current snapOffsetLeft value. Default value is null
    See Also:
      - `getSnapTo()`
      - `SnapPositioning overview and related methods`

  - ### setSnapOffsetTop

    public Canvas setSnapOffsetTop(Integer snapOffsetTop)
    If `snapTo` is defined for this widget, this property can be used to specify an offset in px or percentage for the top coordinate of this widget.

    For example if `snapTo` is specified as `"T"` and `snapOffsetTop` is set to 6, this widget will be rendered 6px below the top edge of its parent or master element. Alternatively if `snapTo` was set to `"B"`, a `snapOffsetTop` value of -6 would cause the component to be rendered 6px inside the bottom edge of its parent or `master canvas`.
    If this method is called after the component has been drawn/initialized: Setter for `snapOffsetTop`.

    Parameters:
      `snapOffsetTop` - new snapOffsetTop value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setSnapTo(java.lang.String)`
      - `SnapPositioning overview and related methods`

  - ### getSnapOffsetTop

    public Integer getSnapOffsetTop()
    If `snapTo` is defined for this widget, this property can be used to specify an offset in px or percentage for the top coordinate of this widget.

    For example if `snapTo` is specified as `"T"` and `snapOffsetTop` is set to 6, this widget will be rendered 6px below the top edge of its parent or master element. Alternatively if `snapTo` was set to `"B"`, a `snapOffsetTop` value of -6 would cause the component to be rendered 6px inside the bottom edge of its parent or `master canvas`.

    Returns:
      Current snapOffsetTop value. Default value is null
    See Also:
      - `getSnapTo()`
      - `SnapPositioning overview and related methods`

  - ### setSnapOnDrop

    public Canvas setSnapOnDrop(Boolean snapOnDrop)
    When this canvas is dropped onto an object supporting snap-to-grid, should it snap to the grid (true, the default) or just drop wherever the mouse is (false).

    Note : This is an advanced setting

    Parameters:
      `snapOnDrop` - New snapOnDrop value. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setSnapToGrid(java.lang.Boolean)`
      - `com.smartgwt.client.widgets.Canvas#shouldSnapOnDrop`
      - `SnapGridDragging overview and related methods`

  - ### getSnapOnDrop

    public Boolean getSnapOnDrop()
    When this canvas is dropped onto an object supporting snap-to-grid, should it snap to the grid (true, the default) or just drop wherever the mouse is (false).
    Returns:
      Current snapOnDrop value. Default value is true
    See Also:
      - `getSnapToGrid()`
      - `com.smartgwt.client.widgets.Canvas#shouldSnapOnDrop`
      - `SnapGridDragging overview and related methods`

  - ### setSnapResizeToAlign

    public Canvas setSnapResizeToAlign(Boolean snapResizeToAlign)
    Flag to disable snapping to alignment when this Canvas is resized.

    To control snapping to align for the children resized within this Canvas, see `childrenResizeSnapAlign` instead.

    Parameters:
      `snapResizeToAlign` - New snapResizeToAlign value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getSnapResizeToAlign

    public Boolean getSnapResizeToAlign()
    Flag to disable snapping to alignment when this Canvas is resized.

    To control snapping to align for the children resized within this Canvas, see `childrenResizeSnapAlign` instead.

    Returns:
      Current snapResizeToAlign value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setSnapResizeToGrid

    public Canvas setSnapResizeToGrid(Boolean snapResizeToGrid)
    Causes this canvas to snap to its parent's grid when resizing. Note that this value defaults to the Canvas's `snapToGrid` value if undefined.
    Parameters:
      `snapResizeToGrid` - New snapResizeToGrid value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getSnapResizeToGrid

    public Boolean getSnapResizeToGrid()
    Causes this canvas to snap to its parent's grid when resizing. Note that this value defaults to the Canvas's `snapToGrid` value if undefined.
    Returns:
      Current snapResizeToGrid value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setSnapTo

    public Canvas setSnapTo(String snapTo)
    Position this widget such that it is aligned with ("snapped to") an edge of its `master` (if specified), or its `parent canvas`.

    Note that this property also impacts the sizing of this widget. If this widgets size is specified as a percent value, and has no explicit `percentSource`, sizing will be calculated based on the size of the `master canvas` when snapTo is set.

    Possible values: BR, BL, TR, TL, R, L, B, T, C where B=Bottom, T=Top, L=Left, R=right and C=center

    Standard snapTo behavior will attach the outer edge of the widget to the parent or master element - for example setting `snapTo` to `"B"` would align the bottom edge of this component with the bottom edge of the master or parent element (and center this component horizontally over its master or parent element). `snapEdge` can be specified to change this behavior allowing the developer to, for example, align the top edge of this component with the bottom edge of its `master canvas`.

    `snapOffsetLeft` and `snapOffsetTop` may also be specified to offset the element from exact snapTo alignment.
    If this method is called after the component has been drawn/initialized: Set the snapTo property of this canvas, and handle repositioning.

    Parameters:
      `snapTo` - new snapTo value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setSnapEdge(java.lang.String)`
      - `setPercentBox(com.smartgwt.client.types.PercentBoxModel)`
      - `SnapPositioning overview and related methods`

  - ### getSnapTo

    public String getSnapTo()
    Position this widget such that it is aligned with ("snapped to") an edge of its `master` (if specified), or its `parent canvas`.

    Note that this property also impacts the sizing of this widget. If this widgets size is specified as a percent value, and has no explicit `percentSource`, sizing will be calculated based on the size of the `master canvas` when snapTo is set.

    Possible values: BR, BL, TR, TL, R, L, B, T, C where B=Bottom, T=Top, L=Left, R=right and C=center

    Standard snapTo behavior will attach the outer edge of the widget to the parent or master element - for example setting `snapTo` to `"B"` would align the bottom edge of this component with the bottom edge of the master or parent element (and center this component horizontally over its master or parent element). `snapEdge` can be specified to change this behavior allowing the developer to, for example, align the top edge of this component with the bottom edge of its `master canvas`.

    `snapOffsetLeft` and `snapOffsetTop` may also be specified to offset the element from exact snapTo alignment.

    Returns:
      Return the snapTo value of this object. Default value is null
    See Also:
      - `getSnapEdge()`
      - `getPercentBox()`
      - `SnapPositioning overview and related methods`

  - ### setSnapToAlign

    public Canvas setSnapToAlign(Boolean snapToAlign)
    Flag to disable snapping to alignment when this Canvas is dragged when `childrenSnapAlign` is enabled on this Canvas' parent.

    To control snapping to align for the children dragged within this Canvas, see `childrenSnapAlign` instead.

    Parameters:
      `snapToAlign` - New snapToAlign value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getSnapToAlign

    public Boolean getSnapToAlign()
    Flag to disable snapping to alignment when this Canvas is dragged when `childrenSnapAlign` is enabled on this Canvas' parent.

    To control snapping to align for the children dragged within this Canvas, see `childrenSnapAlign` instead.

    Returns:
      Current snapToAlign value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setSnapToCenterAlign

    public Canvas setSnapToCenterAlign(Boolean snapToCenterAlign)
    Flag to disable snapping to center alignment when this Canvas is dragged when `childrenSnapAlign` is enabled on this Canvas' parent.
    Parameters:
      `snapToCenterAlign` - New snapToCenterAlign value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getSnapToCenterAlign

    public Boolean getSnapToCenterAlign()
    Flag to disable snapping to center alignment when this Canvas is dragged when `childrenSnapAlign` is enabled on this Canvas' parent.
    Returns:
      Current snapToCenterAlign value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setSnapToEdgeAlign

    public Canvas setSnapToEdgeAlign(Boolean snapToEdgeAlign)
    Flag to disable snapping to edge alignment when this Canvas is dragged when `childrenSnapAlign` is enabled on this Canvas' parent.
    Parameters:
      `snapToEdgeAlign` - New snapToEdgeAlign value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getSnapToEdgeAlign

    public Boolean getSnapToEdgeAlign()
    Flag to disable snapping to edge alignment when this Canvas is dragged when `childrenSnapAlign` is enabled on this Canvas' parent.
    Returns:
      Current snapToEdgeAlign value. Default value is null
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### setSnapToGrid

    public Canvas setSnapToGrid(Boolean snapToGrid)
    Causes this canvas to snap to its parent's grid when dragging.
    Parameters:
      `snapToGrid` - New snapToGrid value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setChildrenSnapToGrid(java.lang.Boolean)`
      - `SnapGridDragging overview and related methods`

  - ### getSnapToGrid

    public Boolean getSnapToGrid()
    Causes this canvas to snap to its parent's grid when dragging.
    Returns:
      Current snapToGrid value. Default value is null
    See Also:
      - `getChildrenSnapToGrid()`
      - `SnapGridDragging overview and related methods`

  - ### setSnapVDirection

    public Canvas setSnapVDirection(String snapVDirection)
    The vertical snap direction. Set this value to "before" to snap to the nearest gridpoint above; set it to "after" to snap to the nearest gridpoint below; and set it to "nearest" to snap to the nearest gridpoint in either direction.
    Parameters:
      `snapVDirection` - New snapVDirection value. Default value is "after"
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setSnapToGrid(java.lang.Boolean)`
      - `setSnapResizeToGrid(java.lang.Boolean)`
      - `setChildrenSnapToGrid(java.lang.Boolean)`
      - `setChildrenSnapResizeToGrid(java.lang.Boolean)`
      - `SnapGridDragging overview and related methods`

  - ### getSnapVDirection

    public String getSnapVDirection()
    The vertical snap direction. Set this value to "before" to snap to the nearest gridpoint above; set it to "after" to snap to the nearest gridpoint below; and set it to "nearest" to snap to the nearest gridpoint in either direction.
    Returns:
      Current snapVDirection value. Default value is "after"
    See Also:
      - `getSnapToGrid()`
      - `getSnapResizeToGrid()`
      - `getChildrenSnapToGrid()`
      - `getChildrenSnapResizeToGrid()`
      - `SnapGridDragging overview and related methods`

  - ### setSnapVGap

    public Canvas setSnapVGap(int snapVGap)
    The vertical grid size to use, in pixels, when snap-to-grid is enabled.
    Parameters:
      `snapVGap` - New snapVGap value. Default value is 20
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setSnapToGrid(java.lang.Boolean)`
      - `setSnapResizeToGrid(java.lang.Boolean)`
      - `setChildrenSnapToGrid(java.lang.Boolean)`
      - `setChildrenSnapResizeToGrid(java.lang.Boolean)`
      - `SnapGridDragging overview and related methods`

  - ### getSnapVGap

    public int getSnapVGap()
    The vertical grid size to use, in pixels, when snap-to-grid is enabled.
    Returns:
      Current snapVGap value. Default value is 20
    See Also:
      - `getSnapToGrid()`
      - `getSnapResizeToGrid()`
      - `getChildrenSnapToGrid()`
      - `getChildrenSnapResizeToGrid()`
      - `SnapGridDragging overview and related methods`

  - ### setStartLine

    public Canvas setStartLine(Boolean startLine)
    Whether this canvas should always start a new line when used as a tile in a `FlowLayout`. This property is not supported in a `TileLayout` with `TileLayout.layoutPolicy`: "fit" or if databound (i.e. for a `TileGrid`).
    Parameters:
      `startLine` - New startLine value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `TileLayout.setAutoWrapLines(java.lang.Boolean)`

  - ### getStartLine

    public Boolean getStartLine()
    Whether this canvas should always start a new line when used as a tile in a `FlowLayout`. This property is not supported in a `TileLayout` with `TileLayout.layoutPolicy`: "fit" or if databound (i.e. for a `TileGrid`).
    Returns:
      Current startLine value. Default value is false
    See Also:
      - `TileLayout.getAutoWrapLines()`

  - ### setStyleName

    public void setStyleName(String styleName)
    The CSS class applied to this widget as a whole.
    If this method is called after the component has been drawn/initialized: Sets the CSS class for this widget
    Overrides:
      `setStyleName` in class `UIObject`
    Parameters:
      `styleName` - new CSS style name. Default value is "normal"
    See Also:
      - `CSSStyleName`
      - `Appearance overview and related methods`
      - CSS styles Example

  - ### getStyleName

    public String getStyleName()
    The CSS class applied to this widget as a whole.
    Overrides:
      `getStyleName` in class `UIObject`
    Returns:
      Current styleName value. Default value is "normal"
    See Also:
      - `CSSStyleName`
      - `Appearance overview and related methods`
      - CSS styles Example

  - ### setTabIndex

    public Canvas setTabIndex(Integer tabIndex)
    If specified this governs the tabIndex of the widget in the page's tab order. Setting this value to `-1` will ensure the canvas does not show up in the page's tab order, though if `canFocus` is true, the user may still give it keyboard focus by clicking on the widget directly.

    By default Smart GWT auto-assigns tab-indices, ensuring focusable widgets are reachable by tabbing in an intuitive order based on widget hierarchy and draw order. Specifying an explicit tab index means a widget will not participate in this automatic tab position allocation and is typically not recommended except for very simple cases.

    For more information on automatic tab index assignment, including recommended approaches for customizing tab order assignation, see the `TabOrderOverview`. Developers may call `clearExplicitTabIndex()` to clear any explicitly assigned tab index, and have the widget participate in automatic tab position allocation.

    `canvas.tabIndex` cannot be set to greater than `TAB_INDEX_FLOOR` - as we reserve the values above this range for auto-assigned tab-indices.
    If this method is called after the component has been drawn/initialized: Assign an explicit `tabIndex` to this widget at runtime.

    Developers may also call `clearExplicitTabIndex()` to clear any explicitly assigned tab index, and have the widget participate in automatic tab position allocation. For more information see `tabIndex`

    Note : This is an advanced setting

    Parameters:
      `tabIndex` - New tabIndex for this widget. Must be less than `TAB_INDEX_FLOOR` to avoid interfering with auto-assigned tab indices on the page. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Focus`

  - ### getTabIndex

    public Integer getTabIndex()
    If specified this governs the tabIndex of the widget in the page's tab order. Setting this value to `-1` will ensure the canvas does not show up in the page's tab order, though if `canFocus` is true, the user may still give it keyboard focus by clicking on the widget directly.

    By default Smart GWT auto-assigns tab-indices, ensuring focusable widgets are reachable by tabbing in an intuitive order based on widget hierarchy and draw order. Specifying an explicit tab index means a widget will not participate in this automatic tab position allocation and is typically not recommended except for very simple cases.

    For more information on automatic tab index assignment, including recommended approaches for customizing tab order assignation, see the `TabOrderOverview`. Developers may call `clearExplicitTabIndex()` to clear any explicitly assigned tab index, and have the widget participate in automatic tab position allocation.

    `canvas.tabIndex` cannot be set to greater than `TAB_INDEX_FLOOR` - as we reserve the values above this range for auto-assigned tab-indices.

    Returns:
      Current tabIndex value. Default value is null
    See Also:
      - `Focus`

  - ### setTestDataContext

    public Canvas setTestDataContext(DataContext testDataContext) throws IllegalStateException
    A `DataContext` to be used if no `dataContext` is provided (directly or indirectly via a parent). If a DataContext is provided it completely replaces the `testDataContext`.

    DataSources included in the `testDataContext` are immediately provided to `rule context` when used if no other component has done so already. These records are found in rule context 'dataContext' section (ex. `dataContext.Customer` for a Customer record in `testDataContext`) so they do not conflict with normal DataSource records.

    Parameters:
      `testDataContext` - New testDataContext value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `DataContext`

  - ### getTestDataContext

    public DataContext getTestDataContext()
    A `DataContext` to be used if no `dataContext` is provided (directly or indirectly via a parent). If a DataContext is provided it completely replaces the `testDataContext`.

    DataSources included in the `testDataContext` are immediately provided to `rule context` when used if no other component has done so already. These records are found in rule context 'dataContext' section (ex. `dataContext.Customer` for a Customer record in `testDataContext`) so they do not conflict with normal DataSource records.

    Returns:
      Current testDataContext value. Default value is null
    See Also:
      - `DataContext`

  - ### setTop

    public Canvas setTop(int top)
    Number of pixels the top of the widget is offset down from its default drawing context (either its parent's top-left corner, or the document flow, depending on the value of the `position` property).

    Can also be set as a percentage, specified as a String ending in '%', eg, "50%". In this case the top coordinate is considered as a percentage of the specified height of the `parent`.
    If this method is called after the component has been drawn/initialized: Set the top coordinate of this object, relative to its enclosing context, in pixels.

    NOTE: if you're setting multiple coordinates, use setRect() or moveTo() instead

    Parameters:
      `top` - new top coordinate. Default value is 0
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Positioning overview and related methods`

  - ### getTop

    public int getTop()
    Number of pixels the top of the widget is offset down from its default drawing context (either its parent's top-left corner, or the document flow, depending on the value of the `position` property).

    Can also be set as a percentage, specified as a String ending in '%', eg, "50%". In this case the top coordinate is considered as a percentage of the specified height of the `parent`.

    Returns:
      Return the top coordinate of this object, relative to its enclosing context, in pixels. Default value is 0
    See Also:
      - `Positioning overview and related methods`

  - ### setTop

    public Canvas setTop(String top)
    Number of pixels the top of the widget is offset down from its default drawing context (either its parent's top-left corner, or the document flow, depending on the value of the `position` property).

    Can also be set as a percentage, specified as a String ending in '%', eg, "50%". In this case the top coordinate is considered as a percentage of the specified height of the `parent`.
    If this method is called after the component has been drawn/initialized: Set the top coordinate of this object, relative to its enclosing context, in pixels.

    NOTE: if you're setting multiple coordinates, use setRect() or moveTo() instead

    Parameters:
      `top` - new top coordinate. Default value is 0
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Positioning overview and related methods`

  - ### getTopElement

    public Canvas getTopElement() throws IllegalStateException
    The top-most Canvas (i.e., not a child of any other Canvas), if any, in this widget's containment hierarchy.

    Note : This method should be called only after the widget has been rendered.

    Returns:
      Current topElement value. Default value is null
    Throws:
      `IllegalStateException` - if this widget has not yet been rendered.
    See Also:
      - `Component Containment and Hierarchy`

  - ### setUpdateTabPositionOnDraw

    public Canvas setUpdateTabPositionOnDraw(boolean updateTabPositionOnDraw)
    Should canvases with no `parent canvas` be moved to the end of the TabIndexManager tree on draw()?

    If set to false, the tab-position will not be modified on draw.

    This property is useful for cases where the tab position of a widget will be managed by some explicit tabIndex management code.

    Note : This is an advanced setting

    Parameters:
      `updateTabPositionOnDraw` - New updateTabPositionOnDraw value. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getUpdateTabPositionOnDraw

    public boolean getUpdateTabPositionOnDraw()
    Should canvases with no `parent canvas` be moved to the end of the TabIndexManager tree on draw()?

    If set to false, the tab-position will not be modified on draw.

    This property is useful for cases where the tab position of a widget will be managed by some explicit tabIndex management code.

    Returns:
      Current updateTabPositionOnDraw value. Default value is true

  - ### setUpdateTabPositionOnReparent

    public Canvas setUpdateTabPositionOnReparent(boolean updateTabPositionOnReparent)
    Should canvases with a `parent canvas` be added to the TabIndexManager under the parent as described in `updateChildTabPositions()` and `updateChildTabPosition()`?

    If set to false, the tab-position will not be modified on parent change.

    This property is useful for cases where the tab position of a widget will be managed by something other than the parent canvas, for example for `canvasItem canvases`.
    If this method is called after the component has been drawn/initialized: Setter for the `updateTabPositionOnReparent` attribute.

    Note : This is an advanced setting

    Parameters:
      `updateTabPositionOnReparent` - new value for canvas.updateTabPositionOnReparent. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getUpdateTabPositionOnReparent

    public boolean getUpdateTabPositionOnReparent()
    Should canvases with a `parent canvas` be added to the TabIndexManager under the parent as described in `updateChildTabPositions()` and `updateChildTabPosition()`?

    If set to false, the tab-position will not be modified on parent change.

    This property is useful for cases where the tab position of a widget will be managed by something other than the parent canvas, for example for `canvasItem canvases`.

    Returns:
      Current updateTabPositionOnReparent value. Default value is true

  - ### setUseBackMask

    public Canvas setUseBackMask(Boolean useBackMask)
    In earlier versions of Internet Explorer (pre IE9), a native limitation exists whereby if HTML elements are overlapping on the page, certain elements can appear to "burn through" elements in the same position with a higher z-index. Specific cases in which this have been observed include Applets, <IFRAME> elements, and for older versions of IE, native <SELECT> items.

    The backMask is a workaround for this issue. If `useBackMask` is set to `true`, the component will render an empty <IFRAME> element behind the canvas, which prevents this effect in all known cases.

    Has no effect in other browsers.

    Note : This is an advanced setting

    Parameters:
      `useBackMask` - New useBackMask value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getUseBackMask

    public Boolean getUseBackMask()
    In earlier versions of Internet Explorer (pre IE9), a native limitation exists whereby if HTML elements are overlapping on the page, certain elements can appear to "burn through" elements in the same position with a higher z-index. Specific cases in which this have been observed include Applets, <IFRAME> elements, and for older versions of IE, native <SELECT> items.

    The backMask is a workaround for this issue. If `useBackMask` is set to `true`, the component will render an empty <IFRAME> element behind the canvas, which prevents this effect in all known cases.

    Has no effect in other browsers.

    Returns:
      Current useBackMask value. Default value is false

  - ### setUseCSSShadow

    public Canvas setUseCSSShadow(boolean useCSSShadow) throws IllegalStateException
    If `showShadow` is true, should we use the css `box-shadow` property (where supported) to achieve the shadow?

    Set this property to false to switch to a media-based approach, achieved by rendering the `shadowImage` in an automatically generated peer. This approach is also used regardless of this property value in older browsers where the css `box-shadow` property isn't supported.

    See also `shadowColor`, `shadowDepth`, `shadowOffset`, `shadowSoftness` and `shadowSpread`

    Note : This is an advanced setting

    Parameters:
      `useCSSShadow` - New useCSSShadow value. Default value is true
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getUseCSSShadow

    public boolean getUseCSSShadow()
    If `showShadow` is true, should we use the css `box-shadow` property (where supported) to achieve the shadow?

    Set this property to false to switch to a media-based approach, achieved by rendering the `shadowImage` in an automatically generated peer. This approach is also used regardless of this property value in older browsers where the css `box-shadow` property isn't supported.

    See also `shadowColor`, `shadowDepth`, `shadowOffset`, `shadowSoftness` and `shadowSpread`

    Returns:
      Current useCSSShadow value. Default value is true

  - ### setUseDragMask

    public Canvas setUseDragMask(boolean useDragMask)
    This flag controls whether we register the component as a maskable item with the EventHandler. If enabled, a backmask will be automatically created for the dragMoveTarget on the fly to avoid burnthrough e.g. by plugins or frames.

    Note that this property will be defaulted to false unless the canvas contains an IFrame, in which case it will be defaulted to true.

    The `dragMaskType` property controls what kind of mask is used in case useDragMask is enabled.

    Parameters:
      `useDragMask` - New useDragMask value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Drag and Drop`

  - ### getUseDragMask

    public boolean getUseDragMask()
    This flag controls whether we register the component as a maskable item with the EventHandler. If enabled, a backmask will be automatically created for the dragMoveTarget on the fly to avoid burnthrough e.g. by plugins or frames.

    Note that this property will be defaulted to false unless the canvas contains an IFrame, in which case it will be defaulted to true.

    The `dragMaskType` property controls what kind of mask is used in case useDragMask is enabled.

    Returns:
      Current useDragMask value. Default value is false
    See Also:
      - `Drag and Drop`

  - ### setUseImageForSVG

    public Canvas setUseImageForSVG(boolean useImageForSVG) throws IllegalStateException
    If set, forces the main SVG image or icon in the canvas to be rendered in an image tag rather than an object tag, the default. Typical use cases might be configuring the image of an `Img` or `ImgButton`, or the icon of a `Button`.

    Rendering via object tag provides the maximum support for CSS in SVG, but may result in a flicker at the browser level when changing images - either manually such as with `setImage()` or via state change from rollover, mouseDown, etc. Using image tags to inline the images breaks CSS support but may avoid flickering.

    If this property is not set, then you can also control whether an SVG image is rendered in an object or image tag by setting the query param "tag" on the image URL - see `SCImgURL` for details.

    Note that if multiple icons are potentially present in a canvas (e.g. `removeIcons` in the cells of a grid body), then setting this property on the widget instance may have no effect. In such case, the `Canvas` prototype is consulted.

    Note : This is an advanced setting

    Parameters:
      `useImageForSVG` - New useImageForSVG value. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Img.setSrc(java.lang.String)`
      - `Button.setIcon(java.lang.String)`
      - `setForwardSVGeventsToObject(java.lang.Boolean)`
      - `Images overview and related methods`

  - ### getUseImageForSVG

    public boolean getUseImageForSVG()
    If set, forces the main SVG image or icon in the canvas to be rendered in an image tag rather than an object tag, the default. Typical use cases might be configuring the image of an `Img` or `ImgButton`, or the icon of a `Button`.

    Rendering via object tag provides the maximum support for CSS in SVG, but may result in a flicker at the browser level when changing images - either manually such as with `setImage()` or via state change from rollover, mouseDown, etc. Using image tags to inline the images breaks CSS support but may avoid flickering.

    If this property is not set, then you can also control whether an SVG image is rendered in an object or image tag by setting the query param "tag" on the image URL - see `SCImgURL` for details.

    Note that if multiple icons are potentially present in a canvas (e.g. `removeIcons` in the cells of a grid body), then setting this property on the widget instance may have no effect. In such case, the `Canvas` prototype is consulted.

    Returns:
      Current useImageForSVG value. Default value is false
    See Also:
      - `Img.getSrc()`
      - `Button.getIcon()`
      - `getForwardSVGeventsToObject()`
      - `Images overview and related methods`

  - ### setUseNativeDrag

    public Canvas setUseNativeDrag(Boolean useNativeDrag) throws IllegalStateException
    If set, native HTML5 drag and drop will be used for all drags initiated on this widget (on browsers where this is supported), and native HTML5 drop events occurring over this widget will be processed.

    When using native HTML5 drags, the same series of events fires as for a normal drag (`Canvas.dragStart()`, `Canvas.dropMove()`, etc.), and the `dragType` / `dropTypes` system works. `dragAppearance` is not supported; however, basic customization of the browser's tracker image is supported in certain browsers via the `EventHandler.setDragTrackerImage()` API.

    The primary difference with a native drag is that it can be cross-frame; that is, the user can drag out of the current browser window and drop into a different window or tab.

    To provide information that will be available to a foreign frame, use `EventHandler.setNativeDragData()`. This API must be called when the `Canvas.dragStart()` event fires, and will not work if called at any other time.

    However, due to browser bugs and/or browser-imposed limitations, the information provided to `setNativeDragData` cannot be accessed in the foreign frame until the actual drop occurs (mouse button released). This means drop eligibility cannot be determined dynamically based on the dragged data; instead, eligibility can only be determined based on the `dragType` / `dropTypes` system. For this reason, a `dragType` must be set on the source of a drag.

    NOTE: Although Internet Explorer 10+ supports a subset of the HTML5 drag and drop standard, native drag and drop is disabled in IE (and Microsoft Edge Legacy) because cross-window drags—the primary purpose of this API—are not possible.

    Parameters:
      `useNativeDrag` - New useNativeDrag value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Drag and Drop`
      - Native Drag Create Example

  - ### getUseNativeDrag

    public Boolean getUseNativeDrag()
    If set, native HTML5 drag and drop will be used for all drags initiated on this widget (on browsers where this is supported), and native HTML5 drop events occurring over this widget will be processed.

    When using native HTML5 drags, the same series of events fires as for a normal drag (`Canvas.dragStart()`, `Canvas.dropMove()`, etc.), and the `dragType` / `dropTypes` system works. `dragAppearance` is not supported; however, basic customization of the browser's tracker image is supported in certain browsers via the `EventHandler.setDragTrackerImage()` API.

    The primary difference with a native drag is that it can be cross-frame; that is, the user can drag out of the current browser window and drop into a different window or tab.

    To provide information that will be available to a foreign frame, use `EventHandler.setNativeDragData()`. This API must be called when the `Canvas.dragStart()` event fires, and will not work if called at any other time.

    However, due to browser bugs and/or browser-imposed limitations, the information provided to `setNativeDragData` cannot be accessed in the foreign frame until the actual drop occurs (mouse button released). This means drop eligibility cannot be determined dynamically based on the dragged data; instead, eligibility can only be determined based on the `dragType` / `dropTypes` system. For this reason, a `dragType` must be set on the source of a drag.

    NOTE: Although Internet Explorer 10+ supports a subset of the HTML5 drag and drop standard, native drag and drop is disabled in IE (and Microsoft Edge Legacy) because cross-window drags—the primary purpose of this API—are not possible.

    Returns:
      Current useNativeDrag value. Default value is null
    See Also:
      - `Drag and Drop`
      - Native Drag Create Example

  - ### setUseOpacityFilter

    public Canvas setUseOpacityFilter(Boolean useOpacityFilter) throws IllegalStateException
    Configures where the Opacity filter is used for IE6-8.

    With the default of null, opacity filters are used unless `neverUseFilters` has been set. When set explicitly to true, opacity filters are used even if `neverUseFilters` is true.

    See `IEFilters` for background.

    Parameters:
      `useOpacityFilter` - New useOpacityFilter value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Internet Explorer "filter" effects`

  - ### getUseOpacityFilter

    public Boolean getUseOpacityFilter()
    Configures where the Opacity filter is used for IE6-8.

    With the default of null, opacity filters are used unless `neverUseFilters` has been set. When set explicitly to true, opacity filters are used even if `neverUseFilters` is true.

    See `IEFilters` for background.

    Returns:
      Current useOpacityFilter value. Default value is null
    See Also:
      - `Internet Explorer "filter" effects`

  - ### setUseTouchScrolling

    public Canvas setUseTouchScrolling(Boolean useTouchScrolling) throws IllegalStateException
    On `touch devices`, if this `Canvas` can be scrolled, should touch-dragging the content area result in scrolling? Set to `false` if touch-dragging should not cause scrolling. Note that setting to `false` enables the use of `custom scrollbars` on touch devices.

    `useTouchScrolling` can default to `false` if `disableTouchScrollingForDrag` is `true` and various built-in drag operations are enabled that normally interfere with touch scrolling (e.g. `ListGrid.canDragSelect` and `ListGrid.canReorderRecords`).

    When touch scrolling is disabled, it can be difficult to interact with parts of the custom scrollbars at their default size of 16 pixels. In touch browsers, any touch 8px before the thumb of a `custom scrollbar` will be mapped to the thumb, but the other parts of the scrollbar do not have a similar tolerance applied. The width of the custom scrollbars can be increased by setting the `scrollbarSize` to a larger value, but note that when `spriting is enabled`, changing the `scrollbarSize` may cause tiling of certain images and backgrounds that make up the custom scrollbar. This can be fixed for a component by creating it with `scrollbarConstructor` set to "Scrollbar"—a basic scrollbar class that does not employ spriting.

    Note : This is an advanced setting

    Parameters:
      `useTouchScrolling` - New useTouchScrolling value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Scrolling overview and related methods`

  - ### getUseTouchScrolling

    public Boolean getUseTouchScrolling()
    On `touch devices`, if this `Canvas` can be scrolled, should touch-dragging the content area result in scrolling? Set to `false` if touch-dragging should not cause scrolling. Note that setting to `false` enables the use of `custom scrollbars` on touch devices.

    `useTouchScrolling` can default to `false` if `disableTouchScrollingForDrag` is `true` and various built-in drag operations are enabled that normally interfere with touch scrolling (e.g. `ListGrid.canDragSelect` and `ListGrid.canReorderRecords`).

    When touch scrolling is disabled, it can be difficult to interact with parts of the custom scrollbars at their default size of 16 pixels. In touch browsers, any touch 8px before the thumb of a `custom scrollbar` will be mapped to the thumb, but the other parts of the scrollbar do not have a similar tolerance applied. The width of the custom scrollbars can be increased by setting the `scrollbarSize` to a larger value, but note that when `spriting is enabled`, changing the `scrollbarSize` may cause tiling of certain images and backgrounds that make up the custom scrollbar. This can be fixed for a component by creating it with `scrollbarConstructor` set to "Scrollbar"—a basic scrollbar class that does not employ spriting.

    Returns:
      Current useTouchScrolling value. Default value is null
    See Also:
      - `Scrolling overview and related methods`

  - ### setValuesManager

    public Canvas setValuesManager(ValuesManager valuesManager)
    `ValuesManager` for managing values displayed in this component. If specified at initialization time, this component will be added to the valuesManager via `ValuesManager.addMember()`.

    ValuesManagers allow different fields of a single object to be displayed or edited across multiple UI components. Given a single values object, a valuesManager will handle determining the appropriate field values for its member components and displaying them / responding to edits if the components support this.

    Data may be derived simply from the specified fieldNames within the member components, or for complex nested data structures can be specified by both component and field-level `DataPath`.

    Note that components may be automatically bound to an existing valuesManager attached to a parent component if dataPath is specified. See `dataPath` for more information. Also note that if a databound component has a specified dataSource and dataPath but no specified valuesManager object one will be automatically generated as part of the databinding process
    If this method is called after the component has been drawn/initialized: Setter for the `valuesManager` attribute. This method may be called directly at runtime to set the ValuesManager for a component; it has the same effect as calling `ValuesManager.addMember()`, passing in this DataBoundComponent.

    Note : This is an advanced setting

    Parameters:
      `valuesManager` - new dataPath. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getValuesManager

    public ValuesManager getValuesManager()
    `ValuesManager` for managing values displayed in this component. If specified at initialization time, this component will be added to the valuesManager via `ValuesManager.addMember()`.

    ValuesManagers allow different fields of a single object to be displayed or edited across multiple UI components. Given a single values object, a valuesManager will handle determining the appropriate field values for its member components and displaying them / responding to edits if the components support this.

    Data may be derived simply from the specified fieldNames within the member components, or for complex nested data structures can be specified by both component and field-level `DataPath`.

    Note that components may be automatically bound to an existing valuesManager attached to a parent component if dataPath is specified. See `dataPath` for more information. Also note that if a databound component has a specified dataSource and dataPath but no specified valuesManager object one will be automatically generated as part of the databinding process

    Returns:
      Current valuesManager value. Default value is null

  - ### setValuesManager

    public Canvas setValuesManager(String valuesManager)
    `ValuesManager` for managing values displayed in this component. If specified at initialization time, this component will be added to the valuesManager via `ValuesManager.addMember()`.

    ValuesManagers allow different fields of a single object to be displayed or edited across multiple UI components. Given a single values object, a valuesManager will handle determining the appropriate field values for its member components and displaying them / responding to edits if the components support this.

    Data may be derived simply from the specified fieldNames within the member components, or for complex nested data structures can be specified by both component and field-level `DataPath`.

    Note that components may be automatically bound to an existing valuesManager attached to a parent component if dataPath is specified. See `dataPath` for more information. Also note that if a databound component has a specified dataSource and dataPath but no specified valuesManager object one will be automatically generated as part of the databinding process
    If this method is called after the component has been drawn/initialized: Setter for the `valuesManager` attribute. This method may be called directly at runtime to set the ValuesManager for a component; it has the same effect as calling `ValuesManager.addMember()`, passing in this DataBoundComponent.

    Note : This is an advanced setting

    Parameters:
      `valuesManager` - new dataPath. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `GlobalId`

  - ### getValuesManagerAsString

    public String getValuesManagerAsString()
    `ValuesManager` for managing values displayed in this component. If specified at initialization time, this component will be added to the valuesManager via `ValuesManager.addMember()`.

    ValuesManagers allow different fields of a single object to be displayed or edited across multiple UI components. Given a single values object, a valuesManager will handle determining the appropriate field values for its member components and displaying them / responding to edits if the components support this.

    Data may be derived simply from the specified fieldNames within the member components, or for complex nested data structures can be specified by both component and field-level `DataPath`.

    Note that components may be automatically bound to an existing valuesManager attached to a parent component if dataPath is specified. See `dataPath` for more information. Also note that if a databound component has a specified dataSource and dataPath but no specified valuesManager object one will be automatically generated as part of the databinding process

    Returns:
      Current valuesManager value. Default value is null
    See Also:
      - `GlobalId`

  - ### setVisibility

    public Canvas setVisibility(Visibility visibility)
    Controls widget visibility when the widget is initialized. See `Visibility` type for details.

    Specifying "visible" sets the CSS visiblity to "visible", forcing a child to be visible even if the parent is hidden. Not supported for use with Smart GWT layouts, scrolling or auto-sizing but may be useful when working with third-party or legacy DOM layout systems.

    Note that if `hideUsingDisplayNone` is set for a hidden ancestor, setting `visibility` will have no effect at all until that ancestor becomes visible.
    If this method is called after the component has been drawn/initialized: Sets this widget's visibility to "inherit", so that it becomes visible if all of its parents are visible or it has no parents.

    If the widget has not yet been drawn (and doesn't have a parent or master), this method calls the draw method as well.

    Parameters:
      `visibility` - New visibility value. Default value is Canvas.INHERIT
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Appearance overview and related methods`

  - ### getVisibility

    public Visibility getVisibility()
    Controls widget visibility when the widget is initialized. See `Visibility` type for details.

    Specifying "visible" sets the CSS visiblity to "visible", forcing a child to be visible even if the parent is hidden. Not supported for use with Smart GWT layouts, scrolling or auto-sizing but may be useful when working with third-party or legacy DOM layout systems.

    Note that if `hideUsingDisplayNone` is set for a hidden ancestor, setting `visibility` will have no effect at all until that ancestor becomes visible.

    Returns:
      Returns true if the widget is visible, taking all parents into account, so that a widget which is not hidden might still report itself as not visible if it is within a hidden parent.

      NOTE: Undrawn widgets will report themselves as visible if they would be visible if drawn. Default value is Canvas.INHERIT

    See Also:
      - `Appearance overview and related methods`

  - ### setVisibleWhen

    public Canvas setVisibleWhen(AdvancedCriteria visibleWhen) throws IllegalStateException
    Criteria to be evaluated to determine whether this Canvas should be visible. Re-evaluated whenever data in the `ruleScope` changes.

    A basic criteria uses textMatchStyle:"exact". When specified in `Component XML` this property allows `shorthand formats` for defining criteria.

    Parameters:
      `visibleWhen` - New visibleWhen value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created
    See Also:
      - `Dynamic Rules`

  - ### getVisibleWhen

    public AdvancedCriteria getVisibleWhen()
    Criteria to be evaluated to determine whether this Canvas should be visible. Re-evaluated whenever data in the `ruleScope` changes.

    A basic criteria uses textMatchStyle:"exact". When specified in `Component XML` this property allows `shorthand formats` for defining criteria.

    Returns:
      Current visibleWhen value. Default value is null
    See Also:
      - `Dynamic Rules`

  - ### setWidth

    public Canvas setWidth(Integer width)
    The `canvas.width` attribute specifies the size for a component's horizontal dimension; `canvas.height` specifies the size for the vertical dimension.

    May be set to an integer value (a number of pixels), a percentage value like "50%", or "*".

    See `PercentSizing` for details on how percentage or `"*"` values are resolved actual size.

    If `overflow` is set to "visible", the specified size acts as a minimum, and the component may overflow to show all content and/or children.

    Note that developers wishing to set a default width or height for a component class should set `defaultWidth` or `defaultHeight` instead of specifying an explicit default `width` or `height`. This is important for components added to a `Layout` as members - it allows the Layout to determine whether the canvas has an explicitly specified size that must be respected, or whether it can participate in its `sizing policies`.
    If this method is called after the component has been drawn/initialized: Resizes the widget horizontally to the specified width (moves the right side of the widget). The width parameter can be expressed as a percentage of viewport size or as the number of pixels.

    NOTE: if you're setting multiple coordinates, use resizeTo() or setRect() instead

    Parameters:
      `width` - new width. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `Sizing overview and related methods`

  - ### getWidth

    public Integer getWidth()
    The `canvas.width` attribute specifies the size for a component's horizontal dimension; `canvas.height` specifies the size for the vertical dimension.

    May be set to an integer value (a number of pixels), a percentage value like "50%", or "*".

    See `PercentSizing` for details on how percentage or `"*"` values are resolved actual size.

    If `overflow` is set to "visible", the specified size acts as a minimum, and the component may overflow to show all content and/or children.

    Note that developers wishing to set a default width or height for a component class should set `defaultWidth` or `defaultHeight` instead of specifying an explicit default `width` or `height`. This is important for components added to a `Layout` as members - it allows the Layout to determine whether the canvas has an explicitly specified size that must be respected, or whether it can participate in its `sizing policies`.

    Returns:
      Return the width of this object, in pixels.

      See `GettingCanvasSize`. Default value is null

    See Also:
      - `Sizing overview and related methods`

  - ### setWidth

    public void setWidth(String width)
    The `canvas.width` attribute specifies the size for a component's horizontal dimension; `canvas.height` specifies the size for the vertical dimension.

    May be set to an integer value (a number of pixels), a percentage value like "50%", or "*".

    See `PercentSizing` for details on how percentage or `"*"` values are resolved actual size.

    If `overflow` is set to "visible", the specified size acts as a minimum, and the component may overflow to show all content and/or children.

    Note that developers wishing to set a default width or height for a component class should set `defaultWidth` or `defaultHeight` instead of specifying an explicit default `width` or `height`. This is important for components added to a `Layout` as members - it allows the Layout to determine whether the canvas has an explicitly specified size that must be respected, or whether it can participate in its `sizing policies`.
    If this method is called after the component has been drawn/initialized: Resizes the widget horizontally to the specified width (moves the right side of the widget). The width parameter can be expressed as a percentage of viewport size or as the number of pixels.

    NOTE: if you're setting multiple coordinates, use resizeTo() or setRect() instead

    Overrides:
      `setWidth` in class `UIObject`
    Parameters:
      `width` - new width. Default value is null
    See Also:
      - `Sizing overview and related methods`

  - ### setWorkflows

    public Canvas setWorkflows(Process... workflows) throws IllegalStateException
    List of screen-global `workflows` that can be shared by event handler workflows using a `StartProcessTask`. Each workflow must be assigned an `ID` for lookup.
    Parameters:
      `workflows` - New workflows value. Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the component has been created

  - ### getWorkflows

    public Process[] getWorkflows()
    List of screen-global `workflows` that can be shared by event handler workflows using a `StartProcessTask`. Each workflow must be assigned an `ID` for lookup.
    Returns:
      Current workflows value. Default value is null

  - ### addChild

    public Canvas addChild(Canvas newChild)
    Adds newChild as a child of this widget, set up a named object reference (i.e., this[name]) to the new widget if name argument is provided, and draw the child if this widget has been drawn already.

    If newChild has a parent it will be removed from it. If it has a master, it will be detached from it if the master is a child of a different parent. If newChild has peers, they'll be added to this widget as children as well.

    Parameters:
      `newChild` - new child canvas to add
    Returns:
      the new child, or null if it couldn't be added
    See Also:
      - `Component Containment and Hierarchy`

  - ### addChild

    public Canvas addChild(Canvas newChild, String name)
    See `addChild()`

  - ### addChild

    public Canvas addChild(Canvas newChild, String name, Boolean autoDraw)
    Adds newChild as a child of this widget, set up a named object reference (i.e., this[name]) to the new widget if name argument is provided, and draw the child if this widget has been drawn already.

    If newChild has a parent it will be removed from it. If it has a master, it will be detached from it if the master is a child of a different parent. If newChild has peers, they'll be added to this widget as children as well.

    Parameters:
      `newChild` - new child canvas to add
      `name` - name to assign to child (eg: this[name] == child)
      `autoDraw` - if false, child will not automatically be drawn (only for advanced use)
    Returns:
      the new child, or null if it couldn't be added
    See Also:
      - `Component Containment and Hierarchy`

  - ### addPeer

    public Canvas addPeer(Canvas newPeer)
    Adds newPeer as a peer of this widget (also making it a child of this widget's parent, if any), set up a named object reference (i.e., this[name]) to the new widget if name is provided, and draw the peer if this widget has been drawn already.

    The widget to be added as a peer will be removed from its old master and/or parent, if any, and it will be added as a child to the parent of this canvas (if any)

    Parameters:
      `newPeer` - new peer widget to add
    Returns:
      the new peer, or null if it couldn't be added
    See Also:
      - `Component Containment and Hierarchy`

  - ### addPeer

    public Canvas addPeer(Canvas newPeer, String name)
    See `addPeer()`

  - ### addPeer

    public Canvas addPeer(Canvas newPeer, String name, Boolean autoDraw)
    See `addPeer()`

  - ### addPeer

    public Canvas addPeer(Canvas newPeer, String name, Boolean autoDraw, Boolean preDraw)
    Adds newPeer as a peer of this widget (also making it a child of this widget's parent, if any), set up a named object reference (i.e., this[name]) to the new widget if name is provided, and draw the peer if this widget has been drawn already.

    The widget to be added as a peer will be removed from its old master and/or parent, if any, and it will be added as a child to the parent of this canvas (if any)

    Parameters:
      `newPeer` - new peer widget to add
      `name` - name to assign to peer (eg: this[peer] == child)
      `autoDraw` - if false, peer will not automatically be drawn (only for advanced use)
      `preDraw` - if true, when draw is called on the master widget, the peer will be drawn before the master
    Returns:
      the new peer, or null if it couldn't be added
    See Also:
      - `Component Containment and Hierarchy`

  - ### addSnapAlignCandidate

    public void addSnapAlignCandidate(Canvas newCandidate)
    Add a candidate to `snapAlignCandidates`. Duplicates are automatically avoided.
    Parameters:
      `newCandidate` -

  - ### adjustForContent

    public void adjustForContent(boolean immediate)
    This method tells a component to adjust for changes in the size of its content that happen outside of Smart GWT APIs. This may include:
    1. size changes due to "replaced" HTML elements (elements that may change size after their content loads, such as <img> tags with no sizes). To avoid the need to call `adjustForContent()`, specify sizes on replaced elements wherever possible.
    2. modification of HTML contained in a Canvas by direct manipulation of the DOM - see the `DOM-level Integration overview`. Note that only contents supplied to a widget via `contents` or via an override of `getInnerHTML()` should be manipulated directly. Contents automatically generated by Smart GWT components (such as the basic structure of a Button) should never be manipulated: these structures are considered internal, differ by platform, and will change without notice.
    Parameters:
      `immediate` - By default the adjustment will occur on a small delay for performance reasons. Pass in this parameter to force immediate adjustment.
    See Also:
      - `Sizing overview and related methods`

  - ### animateFade

    public void animateFade(Integer opacity)
    Animate a change in opacity from the widget's current opacity to the specified opacity.
    Parameters:
      `opacity` - desired final opacity
    See Also:
      - Fade Show & Hide Example

  - ### animateFade

    public void animateFade(Integer opacity, AnimationCallback callback)
    See `animateFade()`

  - ### animateFade

    public void animateFade(Integer opacity, AnimationCallback callback, Integer duration)
    See `animateFade()`

  - ### animateFade

    public void animateFade(Integer opacity, AnimationCallback callback, Integer duration, AnimationAcceleration acceleration)
    Animate a change in opacity from the widget's current opacity to the specified opacity.
    Parameters:
      `opacity` - desired final opacity
      `callback` - When the fade completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short, for example by a call to the non-animated API `setOpacity()`.
      `duration` - Duration in ms of the animated fade
      `acceleration` - Optional animation acceleration to bias the ratios
    See Also:
      - Fade Show & Hide Example

  - ### animateMove

    public void animateMove(Integer left, Integer top)
    Animate a reposition of this canvas from its current position to the specified position
    Parameters:
      `left` - new left position (or null for unchanged)
      `top` - new top position (or null for unchanged)
    See Also:
      - Fly Onscreen Example

  - ### animateMove

    public void animateMove(Integer left, Integer top, AnimationCallback callback)
    See `animateMove()`

  - ### animateMove

    public void animateMove(Integer left, Integer top, AnimationCallback callback, Integer duration)
    See `animateMove()`

  - ### animateMove

    public void animateMove(Integer left, Integer top, AnimationCallback callback, Integer duration, AnimationAcceleration acceleration)
    Animate a reposition of this canvas from its current position to the specified position
    Parameters:
      `left` - new left position (or null for unchanged)
      `top` - new top position (or null for unchanged)
      `callback` - When the move completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short, for example by a call to the non-animated APIs `moveTo()` or `moveBy()`.
      `duration` - Duration in ms of the animated move
      `acceleration` - Optional acceleration effect to bias the ratios
    See Also:
      - Fly Onscreen Example

  - ### animateRect

    public void animateRect(Integer left, Integer top, Integer width, Integer height)
    Animate a reposition / resize of this canvas from its current size and position.
    Parameters:
      `left` - new left position (or null for unchanged)
      `top` - new top position (or null for unchanged)
      `width` - new width (or null for unchanged)
      `height` - new height (or null for unchanged)
    See Also:
      - Zoom & Shrink Example

  - ### animateRect

    public void animateRect(Integer left, Integer top, Integer width, Integer height, AnimationCallback callback)
    See `animateRect()`

  - ### animateRect

    public void animateRect(Integer left, Integer top, Integer width, Integer height, AnimationCallback callback, Integer duration)
    See `animateRect()`

  - ### animateRect

    public void animateRect(Integer left, Integer top, Integer width, Integer height, AnimationCallback callback, Integer duration, AnimationAcceleration acceleration)
    Animate a reposition / resize of this canvas from its current size and position.
    Parameters:
      `left` - new left position (or null for unchanged)
      `top` - new top position (or null for unchanged)
      `width` - new width (or null for unchanged)
      `height` - new height (or null for unchanged)
      `callback` - When the setRect completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short, for example by a call to the non-animated API `setRect()`.
      `duration` - Duration in ms of the animated setRect
      `acceleration` - Optional acceleration effect to apply to the animation
    See Also:
      - Zoom & Shrink Example

  - ### animateResize

    public void animateResize(Integer width, Integer height)
    Animate a resize of this canvas from its current size to the specified size

    Note that `animateResizeLayoutMode` allows you to control whether child layout is rerun during every step of the animation, or just at the end, since the former may incur significant overhead depending on the widget hierarchy.

    Parameters:
      `width` - new width (or null for unchanged)
      `height` - new height (or null for unchanged)
    See Also:
      - Resize Example

  - ### animateResize

    public void animateResize(Integer width, Integer height, AnimationCallback callback)
    See `animateResize()`

  - ### animateResize

    public void animateResize(Integer width, Integer height, AnimationCallback callback, Integer duration)
    See `animateResize()`

  - ### animateResize

    public void animateResize(Integer width, Integer height, AnimationCallback callback, Integer duration, AnimationAcceleration acceleration)
    Animate a resize of this canvas from its current size to the specified size

    Note that `animateResizeLayoutMode` allows you to control whether child layout is rerun during every step of the animation, or just at the end, since the former may incur significant overhead depending on the widget hierarchy.

    Parameters:
      `width` - new width (or null for unchanged)
      `height` - new height (or null for unchanged)
      `callback` - When the resize completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short, for example by a call to the non-animated APIs `resizeTo()` or `resizeBy()`.
      `duration` - Duration in ms of the animated resize
      `acceleration` - Optional acceleration effect to apply to the resize
    See Also:
      - Resize Example

  - ### animateScroll

    public void animateScroll(Integer scrollLeft, Integer scrollTop)
    Animate a scroll from the current scroll position to the specified position.
    Parameters:
      `scrollLeft` - desired final left scroll position
      `scrollTop` - desired final top scroll position

  - ### animateScroll

    public void animateScroll(Integer scrollLeft, Integer scrollTop, AnimationCallback callback)
    See `animateScroll()`

  - ### animateScroll

    public void animateScroll(Integer scrollLeft, Integer scrollTop, AnimationCallback callback, Integer duration)
    See `animateScroll()`

  - ### animateScroll

    public void animateScroll(Integer scrollLeft, Integer scrollTop, AnimationCallback callback, Integer duration, AnimationAcceleration acceleration)
    Animate a scroll from the current scroll position to the specified position.
    Parameters:
      `scrollLeft` - desired final left scroll position
      `scrollTop` - desired final top scroll position
      `callback` - When the scroll completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short, for example by a call to the non-animated APIs `scrollTo()` or `scrollBy()`.
      `duration` - Duration in ms of the animated scroll
      `acceleration` - Optional acceleration to bias the animation ratios

  - ### blur

    public void blur()
    If this canvas has keyboard focus, blur it. After this method, the canvas will no longer appear focused and will stop receiving keyboard events.
    See Also:
      - `Focus`

  - ### bringToFront

    public void bringToFront()
    Puts this widget at the top of the stacking order, so it appears in front of all other widgets in the same parent.
    See Also:
      - `ZIndex overview and related methods`
      - Layer Example

  - ### clear

    public void clear()
    Remove all visual representation of a Canvas, including all child or member Canvases, or managed top-level components such as the ListGrid drop location indicator.

    This is more expensive than hide(), because in order to become visible again, the Canvas must be draw()n again. Generally, application code has no reason to call clear() unless it is attempting to do advanced memory management. If you want to temporarily hide a Canvas, use hide() and show(), and if you want to permanently destroy a Canvas, use `destroy()`.

    You would only use clear() if you were managing a very large pool of components and you wanted to reclaim some of the memory used by components that had not been used in a while, while still being able to just draw() them to make them active and visible again.

    Note: a clear() will happen as part of moving a Canvas to a different parent. See `addChild()`.

  - ### clearExplicitTabIndex

    public void clearExplicitTabIndex()
    If an explicit `tabIndex` was assigned to this widget, clear it. This will enable automatic tab index managment behaviors via the `TabIndexManager` class as described in the `TabOrderOverview`

  - ### addClickHandler

    public HandlerRegistration addClickHandler(ClickHandler handler)
    Add a click handler.

    Executed when the left mouse is clicked (pressed and then released) on this widget. No default implementation.

    Specified by:
      `addClickHandler` in interface `HasClickHandlers`
    Parameters:
      `handler` - the click handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### clickMaskUp

    public Boolean clickMaskUp()
    Determines whether a clickmask is showing
    Returns:
      whether or not a clickmask is showing
    See Also:
      - `showClickMask(com.smartgwt.client.core.Function, com.smartgwt.client.types.ClickMaskMode, com.smartgwt.client.widgets.Canvas[])`

  - ### clickMaskUp

    public Boolean clickMaskUp(String ID)
    Determines whether a clickmask is showing
    Parameters:
      `ID` - optional ID of specific clickMask to check. If not passed, checks for the click mask associated with this widget only.
    Returns:
      whether or not a clickmask is showing
    See Also:
      - `showClickMask(com.smartgwt.client.core.Function, com.smartgwt.client.types.ClickMaskMode, com.smartgwt.client.widgets.Canvas[])`

  - ### contains

    public Boolean contains(Canvas canvas)
    Returns true if element is a descendant of this widget (i.e., exists below this widget in the containment hierarchy); and false otherwise.
    Parameters:
      `canvas` - the canvas to be tested
    Returns:
      true if specified element is a descendant of this canvas; false otherwise
    See Also:
      - `Component Containment and Hierarchy`

  - ### contains

    public Boolean contains(Canvas canvas, Boolean testSelf)
    Returns true if element is a descendant of this widget (i.e., exists below this widget in the containment hierarchy); and false otherwise.
    Parameters:
      `canvas` - the canvas to be tested
      `testSelf` - If passed this method will return true if the canvas parameter is a pointer to this widget.
    Returns:
      true if specified element is a descendant of this canvas; false otherwise
    See Also:
      - `Component Containment and Hierarchy`

  - ### containsEvent

    public Boolean containsEvent()
    Return true if the last event's mouse coordinates are within the bounds of this component.

    NOTE: Z-ordering is not considered for the purposes of this test. If the coordinate you're testing is occluded by other component, but the X,Y coordinates are still within the bounds that component, this method will return true.

    See the related `containsEventTarget()` method for checking whether a canvas contains the target canvas for the current mouse event.

    Returns:
      true if the event occurred within the bounds of this component
    See Also:
      - `Positioning overview and related methods`

  - ### containsEventTarget

    public Boolean containsEventTarget()
    Returns true if the current `mouse event target` is this component or a descendent of this component.

    Note that, unlike `containsEvent()`, this method is not based on reported event coordinates and there are cases where `containsEvent()` and `containsEventTarget()` will return different values, including when the mouse is within the bounds of a target component, but another canvas is rendered in front of it in the page's z-order.

    Returns:
      true if the event occurred over this canvas or a descendant of this canvas

  - ### containsFocus

    public Boolean containsFocus()
    Returns true if the keyboard focus is in this Canvas or any child of this Canvas.
    Returns:
      whether this Canvas contains the keyboard focus
    See Also:
      - `Focus`

  - ### containsPoint

    public Boolean containsPoint(int x, int y)
    Return whether or not this object contains the specified global (x,y) coordinates.

    Will return false if any parent canvas does not contain the specified point, (EG: you're hovering over an element's absolute location, but it is scrolled out of view in a parent element)

    Parameters:
      `x` - GLOBAL x-coordinate
      `y` - GLOBAL y-coordinate
    Returns:
      true if this object contains the specified point; false otherwise
    See Also:
      - `Positioning overview and related methods`

  - ### containsPoint

    public Boolean containsPoint(int x, int y, Boolean withinViewport)
    Return whether or not this object contains the specified global (x,y) coordinates.

    Will return false if any parent canvas does not contain the specified point, (EG: you're hovering over an element's absolute location, but it is scrolled out of view in a parent element)

    Parameters:
      `x` - GLOBAL x-coordinate
      `y` - GLOBAL y-coordinate
      `withinViewport` - point lies specifically within our viewport (drawn area excluding margins and scrollbars if present)
    Returns:
      true if this object contains the specified point; false otherwise
    See Also:
      - `Positioning overview and related methods`

  - ### dataContextChanged

    public void dataContextChanged()
    Notification method fired when `DataContext` is bound. This can occur on the initial draw or by an explicit call to `setDataContext()`.

    This feature allows the use of the `dataContext` as a general-purpose API to the screen. For example, if you wanted your screen to support dynamically showing or hiding parts of itself based on a button that is external to the screen, you could do that by implementing this handler to show/hide that part of the screen based on the current state of the `dataContext`.

  - ### deparent

    public void deparent()
    Remove this canvas from its parent if it has one.
    See Also:
      - `Component Containment and Hierarchy`

  - ### depeer

    public void depeer()
    Make this Canvas no longer a peer of its master
    See Also:
      - `Component Containment and Hierarchy`

  - ### disable

    public void disable()
    Disables this widget and any children and peers of this widget.
    See Also:
      - `Enabling and Disabling`

  - ### addDoubleClickHandler

    public HandlerRegistration addDoubleClickHandler(DoubleClickHandler handler)
    Add a doubleClick handler.

    Executed when the left mouse button is clicked twice in rapid succession (within `Canvas.doubleClickDelay` by default) in this object.

    Specified by:
      `addDoubleClickHandler` in interface `HasDoubleClickHandlers`
    Parameters:
      `handler` - the doubleClick handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### doValueDictation

    public void doValueDictation(String text)
    If `supportsVoiceCommands()` returns true, this method may be implemented to deal with transcriptions recorded while this Canvas has focus.

    If focus is in this canvas when the user double-taps the voice-key, records some speech and double-taps again, this method is invoked with the final dictated-text, allowing the canvas to display it or process it in some way, such as saving it to a database or providing it to an AI for processing.

    Note that, if the canvas has a `setValue` method, the transcription will be applied automatically and interactively as the user speaks. If that functionality suits your needs, there is no need to implement this method.

    Parameters:
      `text` - the final text as spoken by the user

  - ### doVoiceCommand

    public void doVoiceCommand(String text)
    If `supportsVoiceCommands()` returns true, this method must be implemented to deal with Voice commands recorded while this Canvas has focus.

    If focus is in this canvas or one of its children when the user holds down the VoiceAssist.voiceKey, records some speech and releases the key, this method is invoked with the final dictated-text, allowing the canvas to display it or process it in some way, such as saving it to a database or providing it to an AI for processing.

    Parameters:
      `text` - the final text as spoken by the user

  - ### addDragMoveHandler

    public HandlerRegistration addDragMoveHandler(DragMoveHandler handler)
    Add a dragMove handler.

    Executed every time the mouse moves while dragging this canvas.

    Specified by:
      `addDragMoveHandler` in interface `HasDragMoveHandlers`
    Parameters:
      `handler` - the dragMove handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addDragRepositionMoveHandler

    public HandlerRegistration addDragRepositionMoveHandler(DragRepositionMoveHandler handler)
    Add a dragRepositionMove handler.

    Executed every time the mouse moves while drag-repositioning. If this method does not Call `DragRepositionMoveEvent.cancel()` from within `DragRepositionMoveHandler.onDragRepositionMove(com.smartgwt.client.widgets.events.DragRepositionMoveEvent)`, the `Canvas.dragTarget` (or outline if `Canvas.dragAppearance` is set to "outline") will automatically be moved as appropriate whenever the mouse moves.

    Specified by:
      `addDragRepositionMoveHandler` in interface `HasDragRepositionMoveHandlers`
    Parameters:
      `handler` - the dragRepositionMove handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addDragRepositionStartHandler

    public HandlerRegistration addDragRepositionStartHandler(DragRepositionStartHandler handler)
    Add a dragRepositionStart handler.

    Executed when dragging first starts. No default implementation. Create this handler to set things up for the drag reposition.

    Specified by:
      `addDragRepositionStartHandler` in interface `HasDragRepositionStartHandlers`
    Parameters:
      `handler` - the dragRepositionStart handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addDragRepositionStopHandler

    public HandlerRegistration addDragRepositionStopHandler(DragRepositionStopHandler handler)
    Add a dragRepositionStop handler.

    Executed when the mouse button is released at the end of the drag. Your widget can use this opportunity to fire custom code based upon where the mouse button was released, etc.

    Returning true from this handler will cause the `Canvas.dragTarget` (or outline if `Canvas.dragAppearance` is set to "outline") to be left in its current location. Returning false from this handler will cause it to snap back to its original location.

    Specified by:
      `addDragRepositionStopHandler` in interface `HasDragRepositionStopHandlers`
    Parameters:
      `handler` - the dragRepositionStop handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addDragResizeMoveHandler

    public HandlerRegistration addDragResizeMoveHandler(DragResizeMoveHandler handler)
    Add a dragResizeMove handler.

    Executed every time the mouse moves while drag-resizing. If this method does not Call `DragResizeMoveEvent.cancel()` from within `DragResizeMoveHandler.onDragResizeMove(com.smartgwt.client.widgets.events.DragResizeMoveEvent)`, the `Canvas.dragTarget` (or outline if `Canvas.dragAppearance` is set to "outline") will automatically be moved as appropriate whenever the mouse moves.

    Specified by:
      `addDragResizeMoveHandler` in interface `HasDragResizeMoveHandlers`
    Parameters:
      `handler` - the dragResizeMove handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addDragResizeStartHandler

    public HandlerRegistration addDragResizeStartHandler(DragResizeStartHandler handler)
    Add a dragResizeStart handler.

    Executed when resize dragging first starts. No default implementation. Create this handler to set things up for the drag resize.

    Specified by:
      `addDragResizeStartHandler` in interface `HasDragResizeStartHandlers`
    Parameters:
      `handler` - the dragResizeStart handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addDragResizeStopHandler

    public HandlerRegistration addDragResizeStopHandler(DragResizeStopHandler handler)
    Add a dragResizeStop handler.

    Executed when the mouse button is released at the end of the drag resize. Your widget can use this opportunity to fire custom code based upon where the mouse button was released, etc.

    Returning true from this handler will cause the `Canvas.dragTarget` (or outline if `Canvas.dragAppearance` is set to "outline") to be left at its current size. Returning false from this handler will cause it to snap back to its original location size

    Specified by:
      `addDragResizeStopHandler` in interface `HasDragResizeStopHandlers`
    Parameters:
      `handler` - the dragResizeStop handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addDragStartHandler

    public HandlerRegistration addDragStartHandler(DragStartHandler handler)
    Add a dragStart handler.

    Executed when dragging first starts. Your widget can use this opportunity to set things up for the drag, such as setting the drag tracker. Returning false from this event handler will cancel the drag action entirely.

    A drag action is considered to be begin when the mouse has moved `Canvas.dragStartDistance` with the left mouse down.

    Specified by:
      `addDragStartHandler` in interface `HasDragStartHandlers`
    Parameters:
      `handler` - the dragStart handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addDragStopHandler

    public HandlerRegistration addDragStopHandler(DragStopHandler handler)
    Add a dragStop handler.

    Executed when the mouse button is released at the end of the drag. Your widget can use this opportunity to fire code based on the last location of the drag or reset any visual state that was sent.

    Specified by:
      `addDragStopHandler` in interface `HasDragStopHandlers`
    Parameters:
      `handler` - the dragStop handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addDropMoveHandler

    public HandlerRegistration addDropMoveHandler(DropMoveHandler handler)
    Add a dropMove handler.

    Executed whenever the compatible dragged object is moved over this drop target. You can use this to show a custom visual indication of where the drop would occur within the widget, or to show the `no-drop cursor` to indicate that this is not a valid drop target, typically if `Canvas.willAcceptDrop()` returns false.

    For details on showing a 'no drop' cursor when the user drags over all invalid drop targets, see `showNoDropIndicator`.

    Specified by:
      `addDropMoveHandler` in interface `HasDropMoveHandlers`
    Parameters:
      `handler` - the dropMove handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addDropOutHandler

    public HandlerRegistration addDropOutHandler(DropOutHandler handler)
    Add a dropOut handler.

    Executed when the dragged object is no longer over this drop target, including when the drag interaction is ending with a drop on this drop target. If you have set a visual indication in dropOver or dropMove, you should reset it to its normal state in dropOut.

    Specified by:
      `addDropOutHandler` in interface `HasDropOutHandlers`
    Parameters:
      `handler` - the dropOut handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addDropOverHandler

    public HandlerRegistration addDropOverHandler(DropOverHandler handler)
    Add a dropOver handler.

    Executed when the compatible dragged object is first moved over this drop target. Your implementation can use this to show a custom visual indication that the object can be dropped here.

    Specified by:
      `addDropOverHandler` in interface `HasDropOverHandlers`
    Parameters:
      `handler` - the dropOver handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### enable

    public void enable()
    Enables this widget and any children / peers of this widget.
    See Also:
      - `Enabling and Disabling`

  - ### encloses

    public Boolean encloses(Canvas other)
    Returns true if the rectangle of this widget encloses the rectangle of the specified widget.
    Parameters:
      `other` - other canvas to test for enclosure
    Returns:
      true if this canvas encloses other; false otherwise
    See Also:
      - `Positioning overview and related methods`

  - ### focus

    public void focus()
    If this canvas can accept focus, give it keyboard focus. After this method, the canvas will appear focused and will receive keyboard events.
    See Also:
      - `Focus`

  - ### focusAfterGroup

    public void focusAfterGroup()
    Shifts focus to the next focusable element after this one, skipping any elements nested inside the tabbing group for this canvas, such as focusable children.

    This method makes use of the `TabIndexManager.shiftFocusAfterGroup()` method to request focus be changed to the next registered entry. By default standard focusable Smart GWT UI elements, including Canvases, FormItems, FormItemIcons, etc are registered with the TabIndexManager in the appropriate order, and will accept focus if `focusable`, and not `disabled` or `masked`.

    This method differs from `focusInNextTabElement()` in that it will skip any descendants of this widget in the TabIndexManager's hierarchy of potential focus target. By default this means focus will be moved to the next target on the page which is not a descendant of this widget.

    FormItems support a similar method: `FormItem.focusAfterItem()`.

    NOTE: Focusable elements created directly in the raw HTML bootstrap or by application code will not be passed focus by this method unless they have also been explicitly registered with the TabIndexManager. See the `TabOrderOverview` for more information.

    See Also:
      - `getTabIndex()`
      - `focusInNextTabElement()`
      - `Focus`

  - ### focusAtEnd

    public void focusAtEnd(boolean start)
    Shifts focus to the start or end of this canvas and its descendants.

    This method makes use of the `TabIndexManager.shiftFocusWithinGroup()` API to request focus be changed within the set of focusable targets registered under this canvas.

    If the `start` parameter is true, if the canvas itself is focusable it will be given focus, otherwise the first focusable descendant will be given focus. If the `start` parameter is false, the last focusable descendant will be given focus (or if the canvas itself is focusable but there are no focusable descendants, it will receive focus).

    A use case for this might be to programmatically shift focus to the first or last button in a toolbar or similar.

    Parameters:
      `start` - Should we focus at the start or the end of this widget and its descendants.

  - ### addFocusChangedHandler

    public HandlerRegistration addFocusChangedHandler(FocusChangedHandler handler)
    Add a focusChanged handler.

    Notification function fired when this widget receives or loses keyboard focus.

    Specified by:
      `addFocusChangedHandler` in interface `HasFocusChangedHandlers`
    Parameters:
      `handler` - the focusChanged handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### focusInNextTabElement

    public void focusInNextTabElement()
    Shifts focus to the next focusable element after this one. This programatically simulates the user experience of a Tab keypress, and is used automatically when a blocking `clickMask` is up to ensure focus does not move to any masked elements in the UI.

    This method makes use of the `TabIndexManager.shiftFocus()` method to request focus be changed to the adjacent registered entry. By default standard focusable Smart GWT UI elements, including Canvases, FormItems, FormItemIcons, etc are registered with the TabIndexManager in the appropriate order, and will accept focus if `focusable`, and not `disabled` or `masked`.

    The TabIndexManager maintains a hierarchy of focusable targets - so if a parent canvas contains focusable children, they will typically be nested under the parent canvas in this hierarchy. If you want to shift focus to the next target outside this hierarchy (IE: skip any children and put focus into the next widget on the page outside this one), you can use use `focusAfterGroup()`.

    NOTE: Focusable elements created directly in the raw HTML bootstrap or by application code will not be passed focus by this method unless they have also been explicitly registered with the TabIndexManager. See the `TabOrderOverview` for more information.

    See Also:
      - `getTabIndex()`
      - `focusInPreviousTabElement()`
      - `focusAfterGroup()`
      - `Focus`

  - ### focusInPreviousTabElement

    public void focusInPreviousTabElement()
    Shifts focus to the previous focusable element before this one. This programatically simulates the user experience of a Shift+Tab keypress.

    This method makes use of the `TabIndexManager.shiftFocus()` method to request focus be changed to the adjacent registered entry. By default standard focusable Smart GWT UI elements, including Canvases, FormItems, FormItemIcons, etc are registered with the TabIndexManager in the appropriate order, and will accept focus if `focusable`, and not `disabled` or `masked`.

    NOTE: Focusable elements created directly in the raw HTML bootstrap or by application code will not be passed focus by this method unless they have also been explicitly registered with the TabIndexManager. See the `TabOrderOverview` for more information.

    See Also:
      - `getTabIndex()`
      - `focusInNextTabElement()`
      - `Focus`

  - ### getAriaHandleID

    public String getAriaHandleID()
    Returns the DOM ID for the main element for this canvas which will have ARIA `role` and `attributes` applied to it. This can be useful when applying `custom aria state attributes` which need to refer to the DOM handle of another canvas, such as aria-controls.

    Note that we do not recommend using this ID to identify the element in the DOM for integration with automated testing tools. The `AutoTest.getLocator()` and `AutoTest.getElement()` APIs should be used instead. These locators are much finer grained - they allow developers to identify sub-elements within the widget handle that map to specific logical Smart GWT objects (for example FormItem Icons within a DynamicForm). They are also more stable - AutoTest locators are able to reliably identify components based on their position in the application hierarchy and other context, while the DOM element IDs are not guaranteed not to change across page reloads.

    Returns:
      ID written into the DOM element for this component

  - ### getAriaStateDefaults

    public Map getAriaStateDefaults()
    Retrieves dynamically calculated default ARIA state properties for this canvas. These will be combined with `explicitly specified aria state` and applied to the widget handle as described in `getAriaState()`.

    For `disabled canvases`, this method returns an object with `disabled` set to true. May be overridden to apply additional defaults in canvas subclasses.

    Returns:
      dynamically calculated default aria state properties

  - ### getBottom

    public int getBottom()
    Return the bottom coordinate of this object as rendered, relative to its enclosing context, in pixels.
    Returns:
      bottom coordinate
    See Also:
      - `Positioning overview and related methods`

  - ### getChildTabPosition

    public Integer getChildTabPosition(Canvas child)
    For a given child widget where `updateTabPositionOnReparent` is true, return the expected tab position within this parent. Default implementation will any explicit relative tab position specified by `setRelativeTabPosition()`, and otherwise put children in the same order as defined in the children array

    Overridden in the `Layout` class to return the position in the members array.

    Parameters:
      `child` - Child to get local tab position for
    Returns:
      tab position of child within this parent

  - ### getContentElement

    public Element getContentElement()
    Returns the DOM element for this Canvas which contains the `contents`, or for `parent components`, the DOM elements for any drawn children. This method is provided for the very rare cases where a programmer needs to examine the DOM hierarchy created by a drawn Smart GWT component.

    Direct manipulation of the DOM elements created by Smart GWT components is not supported. Smart GWT components should be rendered or cleared using standard methods such as `draw()`, `clear()`. If direct integration with existing DOM structures is required, this should be achieved via the `htmlElement` attribute, rather than by attempting to move the component's outer element via native browser APIs.
    The content of Smart GWT components' DOM elements should also not be directly manipulated using native browser APIs - standard methods such as `setContents()`, `addChild()`, `removeChild()`, `markForRedraw()` and `redraw()` should be used instead.

    In some cases, the element returned may match the element returned by `getOuterElement()`, but this will not always be the case.

    If the widget is undrawn, this method will return `null`.

    Returns:
      The outer DOM element for a drawn Canvas.

  - ### getDefiningPropertyName

    public String getDefiningPropertyName()
    This method returns the name of an attribute for the `AutoTest` system to use as the `definingProperty` when generating `locators`.

    If the value for the attribute returned by this method is non null, the `AutoTest.getLocator()` method will use this property name and value in the locators it generates to search the widget hierarchy for this component.

    The default implementation will return `this.definingProperty` if specified, otherwise the first entry in `this.definingPropertyNameOptions` that has a non empty value for this component.

    Returns:
      property name to use as a defining property when generating AutoTest locators with search segments

  - ### getFullDataPath

    public String getFullDataPath()
    Returns a fully qualified `DataPath` for this canvas. This is calculated by combining the canvas' specified `DataPath` with the `dataPath` of any parent canvases up to whichever canvas has a specified `valuesManager` specified to actually manage values from this component.
    Returns:
      fully qualified dataPath for this component. See `DataPath`

  - ### getHoverHTML

    public String getHoverHTML()
    If `this.showHover` is true, when the user holds the mouse over this Canvas for long enough to trigger a hover event, a hover canvas is shown by default. This method returns the contents of that hover canvas. Default implementation returns `this.prompt` - override for custom hover HTML. Note that returning `null` or an empty string will suppress the hover canvas altogether.
    Returns:
      the string to show in the hover. See `HTMLString`
    See Also:
      - `getShowHover()`

  - ### getHSnapPosition

    public int getHSnapPosition(int coordinate)
    Override this method to provide a custom snap-to grid. Note that you do not need to do this if your grid is regular (ie, grid points are every x pixels); regular grids should be defined using `snapHGap` and `snapVGap`. You should only override this method if you want to provide support for a grid of irregularly-placed points
    Parameters:
      `coordinate` - x-coordinate of the drag event relative to the inside of this widget
    Returns:
      The horizontal coordinate to snap to
    See Also:
      - `Drag and Drop`

  - ### getHSnapPosition

    public int getHSnapPosition(int coordinate, String direction)
    Override this method to provide a custom snap-to grid. Note that you do not need to do this if your grid is regular (ie, grid points are every x pixels); regular grids should be defined using `snapHGap` and `snapVGap`. You should only override this method if you want to provide support for a grid of irregularly-placed points
    Parameters:
      `coordinate` - x-coordinate of the drag event relative to the inside of this widget
      `direction` - "before" or "after" denoting whether the returned coordinate should match the left or right edge of the current square. If unset `snapHDirection` will be used by default
    Returns:
      The horizontal coordinate to snap to
    See Also:
      - `Drag and Drop`

  - ### getImage

    public Element getImage(String identifier)
    Retrieve a native image, SVG object element or the container for an SVG symbol or font-icon, by name.

    The element must have been created from HTML generated by calling `imgHTML()` on this particular Canvas.

    Parameters:
      `identifier` - name of the image or container element to get, as originally passed to `imgHTML()`
    Returns:
      DOM image or container element if found, else null
    See Also:
      - `Images overview and related methods`

  - ### getInnerContentHeight

    public int getInnerContentHeight()
    Returns the amount of space available for interior content (or relatively positioned child widget(s)) without introducing clipping, scrolling or overflow.
    This is the space within the viewport of the widget (not including padding, and excluding margins, borders or scrollbars) rendered at its specified size.

    See `GettingCanvasSize`

    Returns:
      inner height of the widget in pixels
    See Also:
      - `getInnerContentWidth()`
      - `getInnerHeight()`
      - `getInnerWidth()`
      - `Sizing overview and related methods`

  - ### getInnerContentWidth

    public int getInnerContentWidth()
    Returns the amount of space available for interior content (or relatively positioned child widget(s)) without introducing clipping, scrolling or overflow.
    This is the space within the viewport of the widget (not including padding, and excluding margins, borders or scrollbars) rendered at its specified size.

    See `GettingCanvasSize`

    Returns:
      inner height of the widget in pixels
    See Also:
      - `getInnerContentHeight()`
      - `getInnerHeight()`
      - `getInnerWidth()`
      - `Sizing overview and related methods`

  - ### getInnerHeight

    public int getInnerHeight()
    Returns the amount of space available for (an) absolutely positioned child widget(s) or absolutely positioned HTML content, without introducing clipping, scrolling or overflow.

    This is the space within the viewport of the widget (including padding, but excluding margins, borders or scrollbars) rendered at its specified size.

    See `GettingCanvasSize`

    Returns:
      inner height of the widget in pixels
    See Also:
      - `getInnerWidth()`
      - `getInnerContentHeight()`
      - `getInnerContentWidth()`
      - `Sizing overview and related methods`

  - ### getInnerWidth

    public int getInnerWidth()
    Returns the amount of space available for absolutely positioned child widget(s) or absolutely positioned HTML content, without introducing clipping, scrolling or overflow.

    This is the space within the viewport of the widget (including padding, but excluding margins, borders or scrollbars) rendered at its specified size.

    See `GettingCanvasSize`

    Returns:
      inner width of the widget in pixels
    See Also:
      - `getInnerHeight()`
      - `getInnerContentHeight()`
      - `getInnerContentWidth()`
      - `Sizing overview and related methods`

  - ### getLocalId

    public String getLocalId()
    Retrieve the local ID of this canvas. If no local ID is assigned the normal canvas ID is returned making this method a safe replacement for `getID()`.

    A "local ID" originates as an explicit ID assigned to a widget created in Reify. These IDs assigned by Reify become local IDs when a screen is loaded by `RPCManager.loadScreen()` or `RPCManager.cacheScreens()` and `RPCManager.createScreen()`. A local ID is unique only within the scope of a widget's screen, and is not globally unique as is required for `ID`.

    Returns:
      the local ID or standard ID of the Canvas

  - ### getMasterCanvas

    public Canvas getMasterCanvas()
    Returns this canvas's "master" (the canvas to which it was added as a peer), if any.

    See `Containment` for an overview of master/peer relationships.

    Returns:
      the master canvas, null if none exists.
    See Also:
      - `Component Containment and Hierarchy`

  - ### getOffsetX

    public int getOffsetX()
    Return the X-coordinate of the last event relative to the left edge of the content of this Canvas.
    NOTE: To get a coordinate relative to the viewport of this Canvas, subtract this.getScrollLeft()
    Returns:
    See Also:
      - `Positioning overview and related methods`

  - ### getOffsetY

    public int getOffsetY()
    Return the Y-coordinate of the last event, relative to the top edge of the content of this Canvas.
    NOTE: To get a coordinate relative to the viewport of this Canvas, subtract this.getScrollTop()
    Returns:
    See Also:
      - `Positioning overview and related methods`

  - ### getOuterElement

    public Element getOuterElement()
    Returns the outer DOM element of this Canvas. This method is provided for the very rare cases where a programmer needs to examine the DOM hierarchy created by a drawn Smart GWT component.

    Direct manipulation of the DOM elements created by Smart GWT components is not supported. Smart GWT components should be rendered or cleared using standard methods such as `draw()`, `clear()`. If direct integration with existing DOM structures is required, this should be achieved via the `htmlElement` attribute, rather than by attempting to move the component's outer element via native browser APIs.
    The content of Smart GWT components' DOM elements should also not be directly manipulated using native browser APIs - standard methods such as `setContents()`, `addChild()`, `removeChild()`, `markForRedraw()` and `redraw()` should be used instead.

    In some cases, the element returned may match the element returned by `getContentElement()`, but this will not always be the case.

    If the widget is undrawn, this method will return `null`.

    Returns:
      The outer DOM element for a drawn Canvas.

  - ### getPageBottom

    public int getPageBottom()
    Return the page-relative bottom coordinate of this object, in pixels.
    Returns:
      GLOBAL bottom coordinate
    See Also:
      - `Positioning overview and related methods`

  - ### getPageLeft

    public int getPageLeft()
    Returns the page-relative left coordinate of the widget on the page, in pixels.
    Returns:
      global left coordinate
    See Also:
      - `Positioning overview and related methods`

  - ### getPageRight

    public int getPageRight()
    Return the page-relative right coordinate of this object, in pixels.
    Returns:
      GLOBAL right coordinate
    See Also:
      - `Positioning overview and related methods`

  - ### getPageTop

    public int getPageTop()
    Returns the page-relative top coordinate of the widget on the page, in pixels
    Returns:
      GLOBAL top coordinate
    See Also:
      - `Positioning overview and related methods`

  - ### getPanelContainer

    public Canvas getPanelContainer()
    Returns this Canvas's "panel container". A panel container is a widget that manages a collection of panels, like a `TabSet` or `SectionStack`. If this Canvas is not a child of such a panel container, this method returns null.
    Returns:
      the Canvas's panel container, or null if the Canvas is not a chlld of a panel container

  - ### getRight

    public int getRight()
    Return the right coordinate of this object as rendered, relative to its enclosing context, in pixels.
    Returns:
      right coordinate
    See Also:
      - `Positioning overview and related methods`

  - ### getRuleContext

    public Map getRuleContext()
    Get the current value of the rule context collected by the `ruleScope` of this component (which may be this component itself or whatever component is managing the `ruleScope` for this component).

    If the `databoundOnly` parameter is passed as true, only data from components that actually have a `DataSource` is included.

    Use `Canvas.ruleContextChanged()` to get a notification of changes to the rule context.

    Returns:
      the ruleContext object, or null if canvas is not part of a ruleScope

  - ### getRuleContext

    public Map getRuleContext(boolean databoundOnly)
    Get the current value of the rule context collected by the `ruleScope` of this component (which may be this component itself or whatever component is managing the `ruleScope` for this component).

    If the `databoundOnly` parameter is passed as true, only data from components that actually have a `DataSource` is included.

    Use `Canvas.ruleContextChanged()` to get a notification of changes to the rule context.

    Parameters:
      `databoundOnly` - whether to include only data from components that have a `DataSource`
    Returns:
      the ruleContext object, or null if canvas is not part of a ruleScope

  - ### getScrollBottom

    public int getScrollBottom()
    Returns the scrollTop required to scroll vertically to the end of this widget's content.
    Returns:
      scroll bottom coordinate
    See Also:
      - `Scrolling overview and related methods`

  - ### getScrollHeight

    public int getScrollHeight()
    Returns the scrollable height of the widget's contents, including children, ignoring clipping.

    See `GettingCanvasSize`

    Returns:
      height of the element that can scroll
    See Also:
      - `Sizing overview and related methods`

  - ### getScrollLeft

    public int getScrollLeft()
    Get the number of pixels this Canvas is scrolled from its left edge.
    Returns:
      scrollLeft
    See Also:
      - `Scrolling overview and related methods`

  - ### getScrollRight

    public int getScrollRight()
    Returns the scrollLeft required to scroll horizontally to the end of this widget's content.
    Returns:
      scroll bottom coordinate
    See Also:
      - `Scrolling overview and related methods`

  - ### getScrollTop

    public int getScrollTop()
    Get the number of pixels this Canvas is scrolled from its top edge.
    Returns:
      scrollTop
    See Also:
      - `Scrolling overview and related methods`

  - ### getScrollWidth

    public int getScrollWidth()
    Returns the scrollable width of the widget's contents, including children, ignoring clipping.

    See `GettingCanvasSize`

    Returns:
      the scrollable width of the widget's contents
    See Also:
      - `Sizing overview and related methods`

  - ### getViewportHeight

    public int getViewportHeight()
    Returns the height of the viewport onto the scrollable content.

    See `GettingCanvasSize`

    Returns:
      height of the viewport, in pixels
    See Also:
      - `Sizing overview and related methods`

  - ### getViewportWidth

    public int getViewportWidth()
    Returns the width of the viewport onto the scrollable content.

    See `GettingCanvasSize`

    Returns:
      width of the viewport, in pixels
    See Also:
      - `Sizing overview and related methods`

  - ### getVisibleHeight

    public int getVisibleHeight()
    Return the visible height of the Canvas.

    See `GettingCanvasSize`

    Returns:
      visible height in pixels
    See Also:
      - `Sizing overview and related methods`

  - ### getVisibleWidth

    public int getVisibleWidth()
    Return the visible width of the Canvas.

    See `GettingCanvasSize`

    Returns:
      visible width in pixels
    See Also:
      - `Sizing overview and related methods`

  - ### getVSnapPosition

    public int getVSnapPosition(int coordinate)
    Override this method to provide a custom snap-to grid. Note that you do not need to do this if your grid is regular (ie, grid points are every x pixels) - regular grids should be defined using `snapHGap` and `snapVGap`. You should only override this method if you want to provide support for a grid of irregularly-placed points
    Parameters:
      `coordinate` - y-coordinate of the drag event relative to the inside of this widget
    Returns:
      The vertical coordinate to snap to
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getVSnapPosition

    public int getVSnapPosition(int coordinate, String direction)
    Override this method to provide a custom snap-to grid. Note that you do not need to do this if your grid is regular (ie, grid points are every x pixels) - regular grids should be defined using `snapHGap` and `snapVGap`. You should only override this method if you want to provide support for a grid of irregularly-placed points
    Parameters:
      `coordinate` - y-coordinate of the drag event relative to the inside of this widget
      `direction` - "before" or "after" denoting whether the returned coordinate should match the top or bottom edge of the current square. If unset `snapHDirection` will be used by default
    Returns:
      The vertical coordinate to snap to
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### getZIndex

    public int getZIndex(boolean resolveToNumber)
    Get the z-Index of this canvas.
    Parameters:
      `resolveToNumber` - If passed `true`, for undrawn widgets, resolve "auto" to the next available zIndex.
    Returns:
    See Also:
      - `ZIndex overview and related methods`

  - ### handleHover

    public void handleHover()
    Handler fired on a delay when the user hovers the mouse over this hover-target. Default implementation will fire `this.hover()` (if defined), and handle showing the hover canvas if `this.showHover` is true.
    See Also:
      - `getCanHover()`
      - `getShowHover()`
      - `HoverEvent`

  - ### hide

    public void hide()
    Sets the widget's CSS visibility attribute to "hidden".
    See Also:
      - `Visibility overview and related methods`
      - Show & Hide Example

  - ### hideClickMask

    public void hideClickMask()
    Hides the click mask associated with this canvas.
    See Also:
      - `showClickMask(com.smartgwt.client.core.Function, com.smartgwt.client.types.ClickMaskMode, com.smartgwt.client.widgets.Canvas[])`

  - ### hideClickMask

    public void hideClickMask(String ID)
    Hides the click mask associated with this canvas.
    Parameters:
      `ID` - optional ID of specific clickMask to hide. If not passed, defaults to hiding the click mask associated with this widget only.
    See Also:
      - `showClickMask(com.smartgwt.client.core.Function, com.smartgwt.client.types.ClickMaskMode, com.smartgwt.client.widgets.Canvas[])`

  - ### hideComponentMask

    public void hideComponentMask()
    Hide the `component level clickMask` for this widget

  - ### hideComponentMask

    public void hideComponentMask(boolean suppressFocusReset)
    Hide the `component level clickMask` for this widget
    Parameters:
      `suppressFocusReset` - By default when the component-level mask is hidden it will attempt to reset focus to whatever had focus before the mask was shown. Pass this parameter to suppress this behavior.

  - ### hideContextMenu

    public void hideContextMenu()
    The default implementation of this method hides the contextMenu currently being shown for this component (which occurs when the mouse button that toggles the context menu is released). Override if you want some other behavior.
    See Also:
      - `ShowContextMenuEvent`
      - `Menu.hideContextMenu()`
      - `getOffsetX()`
      - `getOffsetY()`

  - ### addHoverHandler

    public HandlerRegistration addHoverHandler(HoverHandler handler)
    Add a hover handler.

    If `canHover` is true for this widget, the `hover` string method will be fired when the user hovers over this canvas. If this method returns false, it will suppress the default behavior of showing a hover canvas if `this.showHover` is true.

    Specified by:
      `addHoverHandler` in interface `HasHoverHandlers`
    Parameters:
      `handler` - the hover handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addHoverHiddenHandler

    public HandlerRegistration addHoverHiddenHandler(HoverHiddenHandler handler)
    Add a hoverHidden handler.

    If `showHover` is true for this canvas, this notification method will be fired whenever the hover shown in response to `handleHover()` is hidden.

    Specified by:
      `addHoverHiddenHandler` in interface `HasHoverHiddenHandlers`
    Parameters:
      `handler` - the hoverHidden handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### initComplete

    public void initComplete()
    Notification method fired after `initWidget()`, when canvas initialization is complete.

    This is a notification method only and has no default implementation

  - ### intersects

    public Boolean intersects(Canvas other)
    Returns true if the rectangles of this widget and the specified widget overlap.
    Parameters:
      `other` - other canvas to test for intersection
    Returns:
      true if this canvas intersects other; false otherwise
    See Also:
      - `Positioning overview and related methods`

  - ### isDirty

    public Boolean isDirty()
    Returns whether a canvas is waiting to be redrawn. Will return true if `markForRedraw()` has been called, but this canvas has not yet been redrawn.
    Returns:
      true is this canvas needs to be redrawn; false otherwise
    See Also:
      - `Drawing overview and related methods`

  - ### isDisabled

    public Boolean isDisabled()
    Is this canvas disabled? Note that the disabled state is inherited - this method will return true if this widget, or any of its ancestors are marked disabled.
    Returns:
      true if the widget or any widget above it in the containment hierarchy are disabled.
    See Also:
      - `Enabling and Disabling`

  - ### isFocused

    public Boolean isFocused()
    Returns true if this Canvas has the keyboard focus. Note that in Internet Explorer focus notifications can be asynchronous (see `synchronousFocusNotifications`). In this case, `canvas.isFocused()` method can correctly return false when, intuitively, you would expect it to return true:

              someCanvas.focus();
              if (someCanvas.isFocused()) {
                  // In most browsers we would get here, but not in Internet Explorer with
                  // EventHandler.synchronousFocusNotifications disabled.
              }

    Returns:
      whether this Canvas has the keyboard focus
    See Also:
      - `containsFocus()`

  - ### addKeyDownHandler

    public HandlerRegistration addKeyDownHandler(KeyDownHandler handler)
    Add a keyDown handler.

    Executed when a key is pressed on a focusable widget (`Canvas.canFocus`: true).

    Use `EventHandler.getKey()` to find out the String of the key that was pressed, and use `EventHandler.shiftKeyDown()` and related functions to determine whether modifier keys were down.

    Specified by:
      `addKeyDownHandler` in interface `HasKeyDownHandlers`
    Parameters:
      `handler` - the keyDown handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addKeyPressHandler

    public HandlerRegistration addKeyPressHandler(KeyPressHandler handler)
    Add a keyPress handler.

    Executed when a key is pressed and released on a focusable widget (`Canvas.canFocus`: true).

    Use `EventHandler.getKey()` to find out the String of the key that was pressed, and use `EventHandler.shiftKeyDown()` and related functions to determine whether modifier keys were down.

    Specified by:
      `addKeyPressHandler` in interface `HasKeyPressHandlers`
    Parameters:
      `handler` - the keyPress handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### keyUp

    public Boolean keyUp()
    Executed when a key is released on a focusable widget (`canFocus`: true).

    Use `EventHandler.getKey()` to find out the String of the key that was pressed, and use `EventHandler.shiftKeyDown()` and related functions to determine whether modifier keys were down.

    Returns:
      false to prevent this event from bubbling to this widget's parent, true or undefined to bubble.
    See Also:
      - `getCanFocus()`

  - ### layoutChildren

    public void layoutChildren(String reason)
    `layoutChildren()` is where a Canvas should implement a sizing policy for it's Canvas children. Since `layoutChildren` calls parentResized() on its children, `parentResized()` is a good place for a child to implement a layout policy that can be used within any parent.

    Recommended practice for a Canvas that manages Canvas children is to create those children without any initial coordinate or size settings and do all sizing when layoutChildren() is called.

    layoutChildren() is always called at least once before children are drawn, and is called automatically whenever the viewport size changes (which includes both resizing and introduction/removal of scrolling). layoutChildren() can also be manually invoked in any other component-specific situation which changes the layout.

    NOTE: layoutChildren() may be called before draw() if a widget is resized before draw(), so be sure to avoid errors such as assuming that any children you automatically create have already been created.

    NOTE: auto-sizing: layoutChildren() is also called once during the initial draw(), before children are drawn, with a "reason" of "initial draw". During this invocation of layoutChildren() it is legal to directly draw children (call child.draw()), which is otherwise never allowed. This allows a Canvas to implement an auto-sizing layout policy by drawing some children before deciding on the sizes of remaining children, which is far more efficient than drawing all children and resizing some of them after they are drawn.

    Parameters:
      `reason` - reason why layoutChildren() is being called, passed when framework code invokes layoutChildren()
    See Also:
      - `Sizing overview and related methods`

  - ### linkHTML

    public String linkHTML(String href)
    Generates the HTML for a standard link (anchor) element.
    Parameters:
      `href` - URL for the link to point to
    Returns:
      HTML for the link. See `HTMLString`

  - ### linkHTML

    public String linkHTML(String href, String text)
    See `linkHTML()`

  - ### linkHTML

    public String linkHTML(String href, String text, String target)
    See `linkHTML()`

  - ### linkHTML

    public String linkHTML(String href, String text, String target, String ID)
    See `linkHTML()`

  - ### linkHTML

    public String linkHTML(String href, String text, String target, String ID, Integer tabIndex)
    See `linkHTML()`

  - ### linkHTML

    public String linkHTML(String href, String text, String target, String ID, Integer tabIndex, String accessKey)
    Generates the HTML for a standard link (anchor) element.
    Parameters:
      `href` - URL for the link to point to
      `text` - HTML to display in the link element (defaults to the href). See `HTMLString`
      `target` - Target window for the link (defaults to opening in a new, unnamed window)
      `ID` - optional ID for the link element to be written out
      `tabIndex` - optional tabIndex for the link
      `accessKey` - optional accessKey for the link
    Returns:
      HTML for the link. See `HTMLString`

  - ### markForDestroy

    public void markForDestroy()
    `destroy()` this canvas on a timeout. This method should be used instead of calling `canvas.destroy()` directly unless there's a reason a the canvas needs to be destroyed synchronously. By using a timeout, this method ensures the `destroy()` will occur after the current thread of execution completes. This allows you to easily mark canvases for destruction while they're handling events, which must complete before the canvas can be destroyed.

    Notes:

    - `markForDestroy()` performs some immediate cleanup and puts a component into a "pending destroy" state. As far as application code is concerned, once a component has been is in this state it should be considered invalid to invoke methods on the component.
    - Developers should not `destroy()` or `markForDestroy()` a component while it is in the middle of an asynchronous operation. For example, if you need to submit and then destroy a single-use dynamic form, the call to `markForDestroy()` should be invoked from the callback to `DynamicForm.saveData()`, rather than being invoked synchronously after the call to `saveData()`
    See Also:
      - `BaseWidget.destroy()`

  - ### markForRedraw

    public void markForRedraw()
    Marks the widget as "dirty" so that it will be added to a queue for redraw. Redraw of dirty components is handled by a looping timer and will after a very short delay (typically less than 100ms). In most cases it is recommended that developers use `markForRedraw()` instead of calling `redraw()` directly. Since this method queues the redraw, multiple calls to markForRedraw() within a single thread of execution will only lead to a single DOM manipulation which greatly improves application performance.
    See Also:
      - `Drawing overview and related methods`

  - ### markForRedraw

    public void markForRedraw(String reason)
    Marks the widget as "dirty" so that it will be added to a queue for redraw. Redraw of dirty components is handled by a looping timer and will after a very short delay (typically less than 100ms). In most cases it is recommended that developers use `markForRedraw()` instead of calling `redraw()` directly. Since this method queues the redraw, multiple calls to markForRedraw() within a single thread of execution will only lead to a single DOM manipulation which greatly improves application performance.
    Parameters:
      `reason` - reason for performing the redraw
    See Also:
      - `Drawing overview and related methods`

  - ### addMouseDownHandler

    public HandlerRegistration addMouseDownHandler(MouseDownHandler handler)
    Add a mouseDown handler.

    Executed when the left mouse button is pressed on this widget. No default implementation.

    Specified by:
      `addMouseDownHandler` in interface `HasMouseDownHandlers`
    Parameters:
      `handler` - the mouseDown handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addMouseMoveHandler

    public HandlerRegistration addMouseMoveHandler(MouseMoveHandler handler)
    Add a mouseMove handler.

    Executed when the mouse moves within this widget. No default implementation.

    Specified by:
      `addMouseMoveHandler` in interface `HasMouseMoveHandlers`
    Parameters:
      `handler` - the mouseMove handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addMouseOutHandler

    public HandlerRegistration addMouseOutHandler(MouseOutHandler handler)
    Add a mouseOut handler.

    Executed when the mouse leaves this widget. No default implementation.

    Note that if the mouse goes over a child of this canvas, the mouseOut event will fire as it would if the user rolled entirely off the canvas. Developers may determine whether the mouse is still over a descendant of this component via `Canvas.containsEventTarget()`.

    Specified by:
      `addMouseOutHandler` in interface `HasMouseOutHandlers`
    Parameters:
      `handler` - the mouseOut handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addMouseOverHandler

    public HandlerRegistration addMouseOverHandler(MouseOverHandler handler)
    Add a mouseOver handler.

    Executed when mouse enters this widget. No default implementation.

    Specified by:
      `addMouseOverHandler` in interface `HasMouseOverHandlers`
    Parameters:
      `handler` - the mouseOver handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addMouseStillDownHandler

    public HandlerRegistration addMouseStillDownHandler(MouseStillDownHandler handler)
    Add a mouseStillDown handler.

    Repeating notification method for the user holding the left mouse button down over this canvas.

    The `mouseStillDown` event is fired immediately when the mouse goes down. If the user holds the mouse down, after a pause of `Canvas.mouseStillDownInitialDelay`, it will begin to fire repeatedly every `Canvas.mouseStillDownDelay` milliseconds.

    This provides developers with a simple way to handle the common "repeated action" use case where a user can click a UI element to perform an action once, or click and hold to perform the action repeatedly.
    Examples of this include standard scrollbar button behavior and buttons to increase or decrease the value in a spinner type input element.

    This event is not native to JavaScript, but is provided by the ISC system.

    Specified by:
      `addMouseStillDownHandler` in interface `HasMouseStillDownHandlers`
    Parameters:
      `handler` - the mouseStillDown handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addMouseUpHandler

    public HandlerRegistration addMouseUpHandler(MouseUpHandler handler)
    Add a mouseUp handler.

    Executed when the left mouse is released on this widget. No default implementation.

    Specified by:
      `addMouseUpHandler` in interface `HasMouseUpHandlers`
    Parameters:
      `handler` - the mouseUp handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addMouseWheelHandler

    public HandlerRegistration addMouseWheelHandler(MouseWheelHandler handler)
    Add a mouseWheel handler.

    Executed when the mouse wheel is actuated.

    Specified by:
      `addMouseWheelHandler` in interface `HasMouseWheelHandlers`
    Parameters:
      `handler` - the mouseWheel handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### moveAbove

    public void moveAbove(Canvas canvas)
    Puts this widget just above the specified widget in the stacking order, so it appears in front of the specified widget if both widgets have the same parent.
    Parameters:
      `canvas` - canvas to move above
    See Also:
      - `ZIndex overview and related methods`
      - Layer Example

  - ### moveBelow

    public void moveBelow(Canvas canvas)
    Puts this widget just below the specified widget in the stacking order, so it appears behind the specified widget if both widgets have the same parent.
    Parameters:
      `canvas` - canvas to move below
    See Also:
      - `ZIndex overview and related methods`
      - Layer Example

  - ### moveBy

    public Boolean moveBy(int deltaX, int deltaY)
    Moves the widget deltaX pixels to the right and deltaY pixels down. Pass negative numbers to move up and/or to the left.
    Parameters:
      `deltaX` - amount to move horizontally (may be negative)
      `deltaY` - amount to move vertically (may be negative)
    Returns:
      whether the component actually moved
    See Also:
      - `Positioning overview and related methods`
      - Move Example

  - ### addMovedHandler

    public HandlerRegistration addMovedHandler(MovedHandler handler)
    Add a moved handler.

    Notification method fired when this component is explicitly moved. Note that a component's position on the screen may also changed due to an ancestor being moved. The `Canvas.parentMoved()` method provides a notification entry point to catch that case as well.

    Specified by:
      `addMovedHandler` in interface `HasMovedHandlers`
    Parameters:
      `handler` - the moved handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### moveTo

    public boolean moveTo(int left, int top)
    Moves the widget so that its top-left corner is at the specified coordinates.

    This method will also accept a single parameter as an object array with left and top given as properties.

    Parameters:
      `left` - x-coordinate to move to in LOCAL coordinates or Object with left and top properties.
      `top` - y-coordinate to move to in LOCAL coordinates
    Returns:
      whether the component actually moved
    See Also:
      - `Positioning overview and related methods`
      - Move Example

  - ### addClearHandler

    public HandlerRegistration addClearHandler(ClearHandler handler)
    Add a clear handler.

    Notification method fired when the canvas is removed from the DOM via a call to `Canvas.clear()`. Canvases are cleared recursively, so if a parent is clear()'d, all of its descendants will also be cleared. This notification is fired before the canvas has been removed from the DOM, and `Canvas.isDrawn()` will return `true` if called while the notification is running.

    Specified by:
      `addClearHandler` in interface `HasClearHandlers`
    Parameters:
      `handler` - the clear handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addDropHandler

    public HandlerRegistration addDropHandler(DropHandler handler)
    Add a drop handler.

    Notification method fired when the user drops another canvas onto this one. Returning `false` from this method will prevent any default drop behavior from occurring

    Specified by:
      `addDropHandler` in interface `HasDropHandlers`
    Parameters:
      `handler` - the drop handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### pageScrollDown

    public void pageScrollDown()
    This method is the programmatic equivalent of the user pressing the "Page Down" key while this widget has the focus. It scrolls the widget's content downwards by the viewport height, if the content can be scrolled that far downwards

  - ### pageScrollUp

    public void pageScrollUp()
    This method is the programmatic equivalent of the user pressing the "Page Up" key while this widget has the focus. It scrolls the widget's content upwards by the viewport height, if the content can be scrolled that far upwards

  - ### addParentMovedHandler

    public HandlerRegistration addParentMovedHandler(ParentMovedHandler handler)
    Add a parentMoved handler.

    Notification method fired when an ancestor of this component's position changes.

    Specified by:
      `addParentMovedHandler` in interface `HasParentMovedHandlers`
    Parameters:
      `handler` - the parentMoved handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### placeNear

    public void placeNear()
    Move this canvas to the specified point, or as close to the specified point as possible without this widget extending beyond the edge of the browser viewport on any side.
    See Also:
      - `Positioning overview and related methods`

  - ### placeNear

    public void placeNear(int left)
    See `placeNear()`

  - ### placeNear

    public void placeNear(int left, int top)
    Move this canvas to the specified point, or as close to the specified point as possible without this widget extending beyond the edge of the browser viewport on any side.
    Parameters:
      `left` - Left coordinate (defaults to mouse position)
      `top` - Top coordinate (defaults to mouse position)
    See Also:
      - `Positioning overview and related methods`

  - ### print

    public void print()
    Generate and show a `PrintWindow` containing a `PrintCanvas` showing a printable view of this component.
    See Also:
      - `showPrintPreview(com.smartgwt.client.widgets.Canvas)`
      - `Printing`

  - ### print

    public void print(PrintProperties printProperties)
    See `print()`

  - ### print

    public void print(PrintProperties printProperties, PrintWindow printWindowProperties)
    See `print()`

  - ### print

    public void print(PrintProperties printProperties, PrintWindow printWindowProperties, String callback)
    Generate and show a `PrintWindow` containing a `PrintCanvas` showing a printable view of this component.
    Parameters:
      `printProperties` - PrintProperties object for customizing the print HTML output
      `printWindowProperties` - Properties to apply to the generated print window.
      `callback` - callback to fire when the print preview canvas has been populated with the printable HTML. This callback takes 2 parameters: `printPreview` - a pointer to the generated print canvas shown in the body of the print window. `printWindow` - a pointer to the generated print window and. See `Callback`
    See Also:
      - `showPrintPreview(com.smartgwt.client.widgets.Canvas)`
      - `Printing`

  - ### redraw

    public void redraw()
    Redraws the widget immediately with its current property values. Generally, if you want a Canvas to redraw, call markForRedraw() - this will cause the Canvas to be redrawn when current processing ends, so that a series of modifications made to a Canvas will cause it to redraw only once. Only call redraw() directly if you need immediate responsiveness, for example you are redrawing in response to continuous mouse motion.
    See Also:
      - `Drawing overview and related methods`

  - ### redraw

    public void redraw(String reason)
    Redraws the widget immediately with its current property values. Generally, if you want a Canvas to redraw, call markForRedraw() - this will cause the Canvas to be redrawn when current processing ends, so that a series of modifications made to a Canvas will cause it to redraw only once. Only call redraw() directly if you need immediate responsiveness, for example you are redrawing in response to continuous mouse motion.
    Parameters:
      `reason` - reason for performing the redraw
    See Also:
      - `Drawing overview and related methods`

  - ### removeChild

    public void removeChild(Canvas child)
    Remove a child from this parent.
    Parameters:
      `child` - Child canvas to remove from this parent.
    See Also:
      - `Component Containment and Hierarchy`

  - ### removeChild

    public void removeChild(Canvas child, String name)
    Remove a child from this parent.
    Parameters:
      `child` - Child canvas to remove from this parent.
      `name` - If the child canvas was assigned a name when added via addChild(), it should be passed in here to ensure no reference is kept to the child
    See Also:
      - `Component Containment and Hierarchy`

  - ### removePeer

    public void removePeer(Canvas peer)
    Remove a peer from this Canvas
    Parameters:
      `peer` - Peer to be removed from this canvas
    See Also:
      - `Component Containment and Hierarchy`

  - ### removePeer

    public void removePeer(Canvas peer, String name)
    Remove a peer from this Canvas
    Parameters:
      `peer` - Peer to be removed from this canvas
      `name` - If this peer was assigned a name when added via addPeer(), it should be passed in here to ensure no reference is kept to the peer
    See Also:
      - `Component Containment and Hierarchy`

  - ### removeRuleContext

    public void removeRuleContext(String path)
    Remove data in the rule context at the specified `path` along with any user-provided schema.

    Normally data is removed from the ruleContext by passing `null` to `data` in `provideRuleContext()`, however, this call will do the same but also removes the schema as explicitly provided to provideRuleContext.

    Data automatically provided to the ruleContext, as described by `ruleScope`, along with the associated schema is automatically removed when the contributing DataBoundComponent is destroyed. Therefore there is no need to clean up those ruleContext paths manually.

    Parameters:
      `path` - path where data and schema should be removed

  - ### removeSnapAlignCandidate

    public void removeSnapAlignCandidate(Canvas candidate)
    Remove a candidate from `snapAlignCandidates`. If the passed widget was not actually a candidate, nothing happens and no warning is logged.
    Parameters:
      `candidate` -
    See Also:
      - `SnapGridDragging overview and related methods`

  - ### resizeBy

    public Boolean resizeBy(int deltaX, int deltaY)
    Resizes the widget, adding deltaX to its width and deltaY to its height (moves the right and/or bottom sides of the widget).
    Parameters:
      `deltaX` - amount to resize horizontally (may be negative)
      `deltaY` - amount to resize vertically (may be negative)
    Returns:
      whether the component actually changed size
    See Also:
      - `Sizing overview and related methods`
      - Resize Example

  - ### addResizedHandler

    public HandlerRegistration addResizedHandler(ResizedHandler handler)
    Add a resized handler.

    Method called whenever a Canvas changes size. Note that if this canvas is `overflow:"visible"`, and is waiting for a queued redraw (see `Canvas.isDirty()`), the value for `Canvas.getVisibleWidth()` and `Canvas.getVisibleHeight()` will be unreliable until `redraw()` fires.
    In this case, if the delayed redraw does change the drawn size of the component, this notification will be fired a second time when it completes.

    Specified by:
      `addResizedHandler` in interface `HasResizedHandlers`
    Parameters:
      `handler` - the resized handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### resizeTo

    public Boolean resizeTo(int width, int height)
    Resizes the widget to the specified width and height (moves the right and/ or bottom sides of the widget). The width and height parameters can be expressed as a percentage of viewport size or as the number of pixels. See `width` or `height` for more on canvas sizing.
    Parameters:
      `width` - new width for canvas.
      `height` - new height for canvas
    Returns:
      whether the size actually changed
    See Also:
      - `Sizing overview and related methods`
      - Resize Example

  - ### addRightMouseDownHandler

    public HandlerRegistration addRightMouseDownHandler(RightMouseDownHandler handler)
    Add a rightMouseDown handler.

    Executed when the right mouse button is pressed on this widget. No default implementation.

    Specified by:
      `addRightMouseDownHandler` in interface `HasRightMouseDownHandlers`
    Parameters:
      `handler` - the rightMouseDown handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### addRuleContextChangedHandler

    public HandlerRegistration addRuleContextChangedHandler(RuleContextChangedHandler handler)
    Add a ruleContextChanged handler.

    Notification that the rule context gathered by the `Canvas.ruleScope` has changed.

    This notification fires only on the component designated as the `Canvas.ruleScope`; components that are merely contributing data to the rule context do not fire `ruleContextChanged`.

    Specified by:
      `addRuleContextChangedHandler` in interface `HasRuleContextChangedHandlers`
    Parameters:
      `handler` - the ruleContextChanged handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### scrollBy

    public void scrollBy(int dX, int dY)
    Scroll this widget by some pixel increment in either (or both) direction(s).

    Note: If you attempt to call this API before the widget is drawn, the call will be ignored.

    Parameters:
      `dX` - Number of pixels to scroll horizontally
      `dY` - Number of pixels to scroll vertically
    See Also:
      - `Scrolling overview and related methods`

  - ### scrollByPercent

    public void scrollByPercent(int dX, int dY)
    Scroll this widget by some percentage of scroll size in either (or both) direction(s).
    Parameters:
      `dX` - Percentage to scroll horizontally. Will accept either a numeric percent value, or a string like "10%".
      `dY` - Percentage to scroll horizontally. Will accept either a numeric percent value, or a string like "10%".
    See Also:
      - `Scrolling overview and related methods`

  - ### addScrolledHandler

    public HandlerRegistration addScrolledHandler(ScrolledHandler handler)
    Add a scrolled handler.

    Notification that this component has just scrolled.

    Fires for both CSS and `"synthetic" scrollbars`.

    Specified by:
      `addScrolledHandler` in interface `HasScrolledHandlers`
    Parameters:
      `handler` - the scrolled handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### scrollTo

    public void scrollTo()
    Scrolls the content of the widget so that the origin (top-left corner) of the content is left pixels to the left and top pixels above the widget's top-left corner (but still clipped by the widget's dimensions).

    This is guaranteed to be called whenever this Canvas is scrolled, whether scrolling is initiated programmatically, by custom scrollbars, or a by a native scrollbar.

    Note: If you attempt to call this API before the widget is drawn, the call will be ignored.

    See Also:
      - `Scrolling overview and related methods`

  - ### scrollTo

    public void scrollTo(Integer left)
    See `scrollTo()`

  - ### scrollTo

    public void scrollTo(Integer left, Integer top)
    Scrolls the content of the widget so that the origin (top-left corner) of the content is left pixels to the left and top pixels above the widget's top-left corner (but still clipped by the widget's dimensions).

    This is guaranteed to be called whenever this Canvas is scrolled, whether scrolling is initiated programmatically, by custom scrollbars, or a by a native scrollbar.

    Note: If you attempt to call this API before the widget is drawn, the call will be ignored.

    Parameters:
      `left` - the left coordinate
      `top` - the top coordinate
    See Also:
      - `Scrolling overview and related methods`

  - ### scrollToBottom

    public void scrollToBottom()
    Vertically scrolls the content of the widget to the end of its content
    See Also:
      - `Scrolling overview and related methods`

  - ### scrollToLeft

    public void scrollToLeft()
    Horizontally scrolls the content of the widget to 0
    See Also:
      - `Scrolling overview and related methods`

  - ### scrollToPercent

    public void scrollToPercent(int left, int top)
    Scroll this widget to some position specified as a percentage of scroll size in either (or both) direction(s).
    Parameters:
      `left` - Left Percentage position to scroll to Will accept either a numeric percent value, or a string like "10%".
      `top` - Top Percentage position to scroll to Will accept either a numeric percent value, or a string like "10%".
    See Also:
      - `Scrolling overview and related methods`

  - ### scrollToRight

    public void scrollToRight()
    Horizontally scrolls the content of the widget to the end of its content
    See Also:
      - `Scrolling overview and related methods`

  - ### scrollToTop

    public void scrollToTop()
    Vertically scrolls the content of the widget to 0
    See Also:
      - `Scrolling overview and related methods`

  - ### sendToBack

    public void sendToBack()
    Puts this widget at the bottom of the stacking order, so it appears behind all other widgets in the same parent.
    See Also:
      - `ZIndex overview and related methods`
      - Layer Example

  - ### setBottom

    public void setBottom(int bottom)
    Resizes the widget vertically to position its bottom edge at the specified coordinate.

    NOTE: if you're setting multiple coordinates, use setRect(), moveTo() or resizeTo() instead

    Parameters:
      `bottom` - new bottom coordinate
    See Also:
      - `Sizing overview and related methods`

  - ### setEditMode

    public void setEditMode(boolean editingOn)
    Enable or disable edit mode for this component. Components in editMode must be associated with an `EditNode` within an `EditContext`.

    Components with editMode enabled support certain editing interactions which vary depending on the componentType and settings on the `editProxy`.

    To disable edit mode just pass `editingOn` as false. The other parameters are not needed.

    To enable edit mode on this component all three parameters are required. The `editNode` is the edit node for this component as it exists within the `editContext`.

    An alternative method, `EditContext.enableEditing()`, can be used when only an editContext and editNode are available.

    Placing a component into `editMode` causes the component's `editProxy` to be created.

    Parameters:
      `editingOn` - true to enable editMode; false to disable
    See Also:
      - `EditTree`
      - `EditContext`

  - ### setEditMode

    public void setEditMode(boolean editingOn, EditContext editContext)
    See `setEditMode()`

  - ### setEditMode

    public void setEditMode(boolean editingOn, EditContext editContext, EditNode editNode)
    Enable or disable edit mode for this component. Components in editMode must be associated with an `EditNode` within an `EditContext`.

    Components with editMode enabled support certain editing interactions which vary depending on the componentType and settings on the `editProxy`.

    To disable edit mode just pass `editingOn` as false. The other parameters are not needed.

    To enable edit mode on this component all three parameters are required. The `editNode` is the edit node for this component as it exists within the `editContext`.

    An alternative method, `EditContext.enableEditing()`, can be used when only an editContext and editNode are available.

    Placing a component into `editMode` causes the component's `editProxy` to be created.

    Parameters:
      `editingOn` - true to enable editMode; false to disable
      `editContext` - the EditContext
      `editNode` - the EditNode
    See Also:
      - `EditTree`
      - `EditContext`

  - ### setImage

    public void setImage(String identifier, String URL)
    Set the URL of an image or SVG object element by name.

    The element must have been created from HTML generated by calling `canvas.imgHTML()` on this particular Canvas.

    Parameters:
      `identifier` - name of the image to change, as originally passed to `imgHTML`
      `URL` - URL for the image. See `SCImgURL`
    See Also:
      - `Images overview and related methods`

  - ### setImage

    public void setImage(String identifier, String URL, String imgDir)
    Set the URL of an image or SVG object element by name.

    The element must have been created from HTML generated by calling `canvas.imgHTML()` on this particular Canvas.

    Parameters:
      `identifier` - name of the image to change, as originally passed to `imgHTML`
      `URL` - URL for the image. See `SCImgURL`
      `imgDir` - optional image directory, overrides the default for this Canvas
    See Also:
      - `Images overview and related methods`

  - ### setLocatorParent

    public boolean setLocatorParent(Canvas locatorParent, String childName)
    This method will set mark the target canvas as the "locator parent" for this canvas, using the specified child name. After calling this method, `locators` that reference this canvas will use the `childName` to navigate from the specified parent to this component, exactly how named `autoChildren` are referenced in locators.

    Note that, as with Smart GWT autoChildren, the locator parent does not need to be the direct parent of this component, or even a true ancestor, in the widget hierarchy. However, you should never set the locatorParent to a descendant of this widget as that would lead to infinite loops when attempting to create or resolve locators.

    This method will also set `locatorParent.attributeName`, (or `locatorParent.childName` if no explicit attributeName was specified) to refer to this canvas, if this is not already the case.

    If the attribute is already set to refer to some other object, this method will return false without taking any further action.

    Parameters:
      `locatorParent` - New locator parent for this canvas
      `childName` - Name to refer from the locator parent to this canvas in the locator
    Returns:
      returns true if the locatorParent was successfully updated

  - ### setLocatorParent

    public boolean setLocatorParent(Canvas locatorParent, String childName, String attributeName)
    This method will set mark the target canvas as the "locator parent" for this canvas, using the specified child name. After calling this method, `locators` that reference this canvas will use the `childName` to navigate from the specified parent to this component, exactly how named `autoChildren` are referenced in locators.

    Note that, as with Smart GWT autoChildren, the locator parent does not need to be the direct parent of this component, or even a true ancestor, in the widget hierarchy. However, you should never set the locatorParent to a descendant of this widget as that would lead to infinite loops when attempting to create or resolve locators.

    This method will also set `locatorParent.attributeName`, (or `locatorParent.childName` if no explicit attributeName was specified) to refer to this canvas, if this is not already the case.

    If the attribute is already set to refer to some other object, this method will return false without taking any further action.

    Parameters:
      `locatorParent` - New locator parent for this canvas
      `childName` - Name to refer from the locator parent to this canvas in the locator
      `attributeName` - Optional attribute to refer from the parent to this canvas. If unset the childName will be used instead.
    Returns:
      returns true if the locatorParent was successfully updated

  - ### setPageLeft

    public void setPageLeft(int left)
    Set the page-relative left coordinate of this widget.
    Parameters:
      `left` - new left coordinate in pixels
    See Also:
      - `Positioning overview and related methods`

  - ### setPageTop

    public void setPageTop(int top)
    Set the page-relative top coordinate of this widget.
    Parameters:
      `top` - new top coordinate in pixels
    See Also:
      - `Positioning overview and related methods`

  - ### setPanelContainer

    public void setPanelContainer(Canvas container)
    Sets this Canvas's "panel container". A panel container is a widget that manages a collection of panels, like a `TabSet` or `SectionStack`. Smart GWT uses this method internally when child panels are added to panel container widgets; if you need to create a panel container widget that does not extend one of the built-in ones (these are `TabSet`, `SectionStack` and `Window`), your code should do the same thing.
    Parameters:
      `container` - The container widget for this canvas

  - ### setRelativeTabPosition

    public void setRelativeTabPosition(Integer position)
    Assign a relative tab position for this canvas. The meaning of a "relative" tab position varies depending on where the canvas is in the page.

    For canvases with no specified `parent canvas`, (or where `updateTabPositionOnReparent` is false), this method will and move the canvas to the appropriate tab-position among other top level canvases. It will also disable `updateTabPositionOnDraw` so if this method is called before draw, drawing this canvas will not cause its tab position to change.

    For canvases embedded in a `getParentCanvas()`, this method will move the canvas to the appropriate tab position among the other children of the parent.
    Implementation note: This is achieved by setting an internal property to indicate the new tab position which will be respected by the default `getChildTabPosition()` implementation, and calling `updateChildTabPositions()` to implement a reflow. Therefore if `getChildTabPosition()` has been overridden, this method may have no effect.

    As with other APIs related to `tab index management`, tab indices are treated as a hierarchy by default. By setting the relative tab position of a canvas which is not itself focusable but has focusable descendents, these descendents' tab position will be updated.

    Note that after this method has been called, the tab position can be modified by subsequent code to shift another sibling in front of this one, or reparent this canvas.

    Parameters:
      `position` - new relative tab position

  - ### setRight

    public void setRight(int right)
    Resizes the widget horizontally to position its right side at the specified coordinate.

    NOTE: if you're setting multiple coordinates, use setRect(), moveTo() or resizeTo() instead

    Parameters:
      `right` - new right coordinate
    See Also:
      - `Sizing overview and related methods`

  - ### shouldDragScroll

    public void shouldDragScroll()
    If this widget is showing scrollbars, and a user drags close to the edge of the viewport, should we scroll the viewport in the appropriate direction? Returns this.canDragScroll if there are scrollbars, else false.
    See Also:
      - `Drag and Drop`

  - ### show

    public void show()
    Sets this widget's visibility to "inherit", so that it becomes visible if all of its parents are visible or it has no parents.

    If the widget has not yet been drawn (and doesn't have a parent or master), this method calls the draw method as well.

    See Also:
      - `Visibility overview and related methods`
      - Show & Hide Example

  - ### showComponentMask

    public void showComponentMask()
    Temporariy block all user interaction with children of this widget, with the exception of those passed in in the `unmaskedChildren` parameter. Children will remain blocked until `hideComponentMask()` is called.

    This method will show the `componentMask` canvas to block mouse interaction with children, and temporarily remove masked children from the page's tab-order.

    This behavior differs from the standard `click mask` in that the modal mask shown by `showClickMask()` will cover the entire screen and typically only allow "unmasking" of top level components.

    Use `hideComponentMask()` to hide the component level mask.

  - ### showComponentMask

    public void showComponentMask(Canvas... unmaskedChildren)
    Temporariy block all user interaction with children of this widget, with the exception of those passed in in the `unmaskedChildren` parameter. Children will remain blocked until `hideComponentMask()` is called.

    This method will show the `componentMask` canvas to block mouse interaction with children, and temporarily remove masked children from the page's tab-order.

    This behavior differs from the standard `click mask` in that the modal mask shown by `showClickMask()` will cover the entire screen and typically only allow "unmasking" of top level components.

    Use `hideComponentMask()` to hide the component level mask.

    Parameters:
      `unmaskedChildren` - Children passed into this parameter will continue to be interactive while other children are blocked. They will be moved above the componentMask in the page's z-order and remain accessible via keyboard navigation. Note that this array should contain direct children of this widget only.

  - ### addShowContextMenuHandler

    public HandlerRegistration addShowContextMenuHandler(ShowContextMenuHandler handler)
    Add a showContextMenu handler.

    Executed when the right mouse button is clicked. The default implementation of this method auto-creates a `Menu` from the `Canvas.contextMenu` property on this component and then calls `Menu.showContextMenu()` on it to show it.

    If you want to show a standard context menu, you can simply define your Menu and set it as the contextMenu property on your component - you do not need to override this method.

    If you want to do some other processing before showing a menu or do something else entirely, then you should override this method. Note that the return value from this method controls whether or not the native browser context menu is shown.

    Specified by:
      `addShowContextMenuHandler` in interface `HasShowContextMenuHandlers`
    Parameters:
      `handler` - the showContextMenu handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### showNextTo

    public void showNextTo(Canvas otherWidget)
    Show this widget next to another widget on the page, positioned such that it will not extend beyond the browser viewport.

    Note that this method simply sets the coordinates of the widget and displays it (using a `animateShow()` by default). It will not change the `parentElement` of either component.

    An example use case might be showing a menu next to a menu-button.

    Parameters:
      `otherWidget` - Canvas to show next to

  - ### showNextTo

    public void showNextTo(Canvas otherWidget, String side)
    See `showNextTo()`

  - ### showNextTo

    public void showNextTo(Canvas otherWidget, String side, boolean canOcclude)
    See `showNextTo()`

  - ### showNextTo

    public void showNextTo(Canvas otherWidget, String side, boolean canOcclude, boolean skipAnimation)
    Show this widget next to another widget on the page, positioned such that it will not extend beyond the browser viewport.

    Note that this method simply sets the coordinates of the widget and displays it (using a `animateShow()` by default). It will not change the `parentElement` of either component.

    An example use case might be showing a menu next to a menu-button.

    Parameters:
      `otherWidget` - Canvas to show next to
      `side` - Which side of the other canvas should we put. Options are "top", "bottom", "left", "right". (Defaults to "right")
      `canOcclude` - This argument controls whether this canvas can be positioned on top of the other widget if there isn't room to put it next to the other widget extending out of the browser viewport
      If 'canOcclude' is true, simply shift this widget over the other widget, so that it ends up onscreen. If 'canOcclude' is false, avoid extending offscreen by positioning this widget on the other side of the other widget.
      `skipAnimation` - If `false` do not use an animation to show the component.

  - ### showPendingMarker

    public void showPendingMarker()
    Manually move this component into the "pending changes" visual state (based on the `pendingMarker style`, or the Pending suffix in stateful components).

    This is used for components that don't automatically track whether there are unsaved changes, such as tabs. Other components (such as `ListGrid` and `DynamicForm`) show the `"pending" visual state` automatically based on whether the end user has edited particular field values.

  - ### showRecursively

    public void showRecursively()
    Recursively show the canvas and all its parents so the canvas will be visible.

    If the widget has not yet been drawn, this method calls the draw method as well.

    See Also:
      - `Visibility overview and related methods`

  - ### supportsValueDictation

    public Boolean supportsValueDictation()
    If this method returns true and VoiceAssist has been activated by triple-tapping the Control key, the user may dictate a new value for this Canvas by double-tapping Control to start recording.

    If this canvas has a `setValue()` method, it will be called interactively as the user speaks. Alternatively, a developer may observe VoiceAssist.recordingProgress() to access the interim transcription.

    While recording, if the user says a cancel-phrase, by default the English phrase "never mind", recording is canceled and not completed. If the transcription was being displayed interactively in the canvas, it is restored to its pre-recording value.

    If the user falls silent for a few seconds, or when they double-tap `Control` again, recording is completed normally and `doValueDictation` is invoked with the final transcription, allowing the canvas to display it or process it in some way, such as saving it to a database or providing it to an AI for action.

    Returns:
      true if value-dictation is supported, false otherwise

  - ### supportsVoiceCommands

    public Boolean supportsVoiceCommands()
    If this method returns true and VoiceAssist has been activated by triple-tapping the Control key, the user may dictate a command to this Canvas.

    When this method returns true, the widget must also implement `doVoiceCommand()`.

    When the user holds down the VoiceAssist.voiceKey, records some speech and releases the key, `doVoiceCommand` is invoked with the final dictated-text, allowing the canvas to display it or process it in some way, such as saving it to a database or providing it to an AI for processing.

    A developer may also observe VoiceAssist.recordingProgress() to access the interim command-transcription interactively as the user speaks.

    Returns:
      true if Voice commands are supported, false otherwise

  - ### updateChildTabPosition

    public void updateChildTabPosition(Canvas child)
    Ensure that a specific child is slotted correctly into the page's tab order. Default implementation will, if `updateTabPositionOnReparent` is true, ensure the child canvas shows up in the `TabIndexManager` tree under the entry for this widget (the parent), in the position returned by `getChildTabPosition()`.

    This method is called automatically in cases where a single child's tab position may need to be updated - such as if a child is added to a drawn parent.

    See also `updateChildTabPositions()`

    Parameters:
      `child` - child to have tab position updated.

  - ### updateChildTabPositions

    public void updateChildTabPositions()
    Update the childrens' tab positions, slotting them under this widget in the `TabIndexManager`, in the order defined by `getChildTabPosition()`. This method will skip any children where `updateTabPositionOnReparent` is false.

    This method is called automatically on canvas draw(). It may be overridden by subclasses for custom tab-order behavior.

  - ### updateHover

    public void updateHover()
    If this canvas is currently showing a hover (see `handleHover()`), this method can be called to update the HTML contents of the hover. Has no effect if this widget is showing `hover-components instead of simple HTML`, or if the hover canvas is not showing for this widget.

  - ### updateHover

    public void updateHover(String hoverHTML)
    If this canvas is currently showing a hover (see `handleHover()`), this method can be called to update the HTML contents of the hover. Has no effect if this widget is showing `hover-components instead of simple HTML`, or if the hover canvas is not showing for this widget.
    Parameters:
      `hoverHTML` - Option to specify new HTML for the hover. If not passed, the result of `this.getHoverHTML()` will be used instead. Note that if the hover HTML is empty the hover will be hidden.

  - ### updateTabPositionForDraw

    public void updateTabPositionForDraw()
    This method is executed on draw. Default implementation for top-level widgets ensures this widget is at the end of the tab-sequence.

    Has no effect if this canvas is embedded in a `parent`.

  - ### addVisibilityChangedHandler

    public HandlerRegistration addVisibilityChangedHandler(VisibilityChangedHandler handler)
    Add a visibilityChanged handler.

    Notification fired when this canvas becomes visible or hidden to the user. Note - this method is fired when the `Canvas.isVisible()` state of this component changes. It may be fired in response an explicit call to `Canvas.show()` or `Canvas.hide()`, or in response to a parent component being shown or hidden when this widgets `Canvas.visibility` is set to "inherit".

    Note that a call to `Canvas.show()` or `Canvas.hide()` will not always fire this notification. If this widget has a hidden parent, show or hide would change this components `Canvas.visibility` property, and may update the CSS visibility attribute of the drawn handle in the DOM, but would not actually hide or reveal the component to the user and as such the notification would not fire.

    Note also that this notification will only be fired for components which have been `drawn`.

    Specified by:
      `addVisibilityChangedHandler` in interface `HasVisibilityChangedHandlers`
    Parameters:
      `handler` - the visibilityChanged handler
    Returns:
      `HandlerRegistration` used to remove this handler

  - ### getAllCanvases

    public static Canvas[] getAllCanvases()
    Returns an array of Canvas instances based on the specified filter mode and optional `AdvancedCriteria`.

    Note: This method is intended for debugging, testing, and diagnostic purposes only. It should not be used in production application code. Applications should maintain their own references to canvases they create rather than querying the global canvas registry.

    This method provides access to the internal registry of all created Canvas instances, filtered according to the specified mode. The default mode ("visible") returns only canvases that are drawn, visible to the end user (checking parental visibility), and non-generated (i.e., developer-created canvases, not autoChildren or other framework- generated components).

    The optional `criteria` parameter allows further filtering using `AdvancedCriteria`. The criteria are evaluated against each canvas's properties. For example, to find all visible Buttons with a specific title:

    Returns:
      Array of matching Canvas instances

  - ### getAllCanvases

    public static Canvas[] getAllCanvases(CanvasFilterMode mode)
    See `getAllCanvases()`

  - ### getAllCanvases

    public static Canvas[] getAllCanvases(CanvasFilterMode mode, AdvancedCriteria criteria)
    Returns an array of Canvas instances based on the specified filter mode and optional `AdvancedCriteria`.

    Note: This method is intended for debugging, testing, and diagnostic purposes only. It should not be used in production application code. Applications should maintain their own references to canvases they create rather than querying the global canvas registry.

    This method provides access to the internal registry of all created Canvas instances, filtered according to the specified mode. The default mode ("visible") returns only canvases that are drawn, visible to the end user (checking parental visibility), and non-generated (i.e., developer-created canvases, not autoChildren or other framework- generated components).

    The optional `criteria` parameter allows further filtering using `AdvancedCriteria`. The criteria are evaluated against each canvas's properties. For example, to find all visible Buttons with a specific title:

    Parameters:
      `mode` - Filter mode determining which canvases to include. Defaults to "visible".
      `criteria` - Optional criteria to further filter the results. Evaluated against each canvas's properties.
    Returns:
      Array of matching Canvas instances

  - ### getEventEdge

    public static EdgeName getEventEdge()
    Check if an event is within an "edge" of this canvas.
    Returns:
      edge where the mouse is positioned, or null if not within a legal edge (including being in the center)
    See Also:
      - `getResizeFrom()`

  - ### getEventEdge

    public static EdgeName getEventEdge(EdgeName... edgeMask)
    Check if an event is within an "edge" of this canvas.
    Parameters:
      `edgeMask` - Array of legal edges. Default is all the edges that allow resizing (see `resizeFrom`)
    Returns:
      edge where the mouse is positioned, or null if not within a legal edge (including being in the center)
    See Also:
      - `getResizeFrom()`

  - ### getSnapPosition

    public static Point getSnapPosition(Canvas target, String snapTo, Canvas snapper)
    Return the position for `snapper` to be placed in order to "snap to" an edge or corner of `target`, in the same sense as `snapTo`.

    Default for `snapEdge` is the opposite edge or corner from `snapTo`. For example, `snapTo` of "T" (top) means `snapEdge` will default to "B" (bottom), so the returned coordinates would place `snapper` centered along the top edge of `target`. A `snapTo` of "TL" (top left) means `snapEdge` will default to "BR" (bottom right), so the returned coordinates would place the bottom right of `snapper` at the top left corner of `target`.

    `target` can be passed as either a Canvas or 4-element Array giving the top, left, width and height of the target.

    Parameters:
      `target` - canvas to snap to
      `snapTo` - edge against which to snap
      `snapper` - canvas being snapped
    Returns:
      the position for `snapper` to be placed in order to "snap to" an edge or corner of `target`

  - ### getSnapPosition

    public static Point getSnapPosition(Canvas target, String snapTo, Canvas snapper, String snapEdge)
    Return the position for `snapper` to be placed in order to "snap to" an edge or corner of `target`, in the same sense as `snapTo`.

    Default for `snapEdge` is the opposite edge or corner from `snapTo`. For example, `snapTo` of "T" (top) means `snapEdge` will default to "B" (bottom), so the returned coordinates would place `snapper` centered along the top edge of `target`. A `snapTo` of "TL" (top left) means `snapEdge` will default to "BR" (bottom right), so the returned coordinates would place the bottom right of `snapper` at the top left corner of `target`.

    `target` can be passed as either a Canvas or 4-element Array giving the top, left, width and height of the target.

    Parameters:
      `target` - canvas to snap to
      `snapTo` - edge against which to snap
      `snapper` - canvas being snapped
      `snapEdge` - optional edge to snapTo. Default is the opposite edge or corner from `snapTo`
    Returns:
      the position for `snapper` to be placed in order to "snap to" an edge or corner of `target`

  - ### getTopLevelComponents

    public static Canvas[] getTopLevelComponents()
    Returns an array of all top-level `Canvases` that are currently drawn and visible, ordered by zIndex (highest zIndex first). This method is useful for error reporting and debugging, as it provides a snapshot of the visible UI state at any given moment.

    A "top-level" component is one that has no parent canvas and is drawn and visible. This method filters the list to include only components that are actually visible to the user, excluding components that are completely occluded by other components with higher zIndex values.

    For example, if there is a modal `Window` on top of a full-screen `NavPanel`, both would be returned (modal Window first due to higher zIndex). However, if there is another Window that is completely hidden behind the NavPanel, it would be excluded from the results.

    This method is particularly useful for capturing UI state as part of error reporting. See `ProdErrorReport` for more information on comprehensive error reporting.

    Returns:
      Array of top-level canvases, sorted by zIndex (highest first)

  - ### registerFontScaledPaddingStyles

    public static void registerFontScaledPaddingStyles(String[] scaledStyles, String[] baselineStyles, int targetSizeChange)
    Registers one or more CSS classes to have their padding adjusted (independently on all edges) according to the `padding size change` applied to the page. Each class to be registered is provided along with a corresponding baseline class, and a single `targetSizeChange` is specified for all the classes. The padding in each registered class is adjusted downward towards the baseline as the padding size change approaches 0 (no resizing), and upward as it increases, so that it exactly equals the declared style's padding at a padding size change of `targetSizeChange`.

    Note that each call to this method replaces the registration of the previous call (if any), and will have no effect until `resizePadding()` is called.

    For example:

             isc.Canvas.registerFontScaledPaddingStyles(
                 [        "tabButtonTop",         "tabButtonBottom"],
                 ["iconOnlyTabButtonTop", "iconOnlyTabButtonBottom"],
                 3
             );

    In this case, the CSS style "tabButtonTop" will have its padding adjusted downward to the padding from the baseline CSS style "iconOnlyTabButtonTop" style at a `sizeChange` of 0, and be left unchanged at a `sizeChange` of 3.
    Parameters:
      `scaledStyles` - styles whose padding should be adjusted
      `baselineStyles` - corresponding baseline reference styles
      `targetSizeChange` - sizeChange at which scaledStyles are unchanged
    See Also:
      - `resizeFonts(int)`
      - `resizePadding(int)`
      - `resizeControls(int)`
      - `com.smartgwt.client.widgets.Canvas#registerIconSizingAttributes`

  - ### resizeAutoChildAttributes

    public static void resizeAutoChildAttributes(String policy, int delta)
    Change the value of attributes registered via `registerAutoChildSizingAttributes()` by some number of pixels. This method may be invoked automatically from `resizeControls()` or `resizeFonts()`

    Must be called after the skin has been loaded, but before any components are created.

    Parameters:
      `policy` - Which set of attributes should be resized? This should correspond to the sizing policy argument applied when `registering the icon sizing attributes`.
      `delta` - number of pixels to increase or decrease from current size

  - ### resizeControls

    public static void resizeControls(int delta)
    Change the basic size of UI components in the current skin by "delta" pixels. Must be called after the skin has been loaded, but before any components are created.

    In general, this method changes the height of various controls, except for certain controls that appear in alternate orientations (such as resizeBars and tabs), in which case thickness properties (resizeBarThickness, tabBarThickness) are adjusted.

    The height of a text input control implies the height of most other controls:

    - all other FormItems (eg selects) need to be the same height or mixed controls will look odd. This includes Buttons
    - anything that potentially contains a FormItem needs to be as tall or slightly taller: this includes grid row (inline editing), `Window headers`, TabBar and SectionHeaders

    Because of this necessary uniformity, just specifying a single pixel value is enough for the framework to resize all core controls, with several caveats:

    - skins that make extensive use of images (eg TreeFrog) will stretch those images, which may result in ugly artifacts in some combinations of operating system and browser, for which no workaround is possible. For this reason, `resizeControls()` is only officially supported in `CSS3 Mode`, which includes any of the skins in our `Flat series` (Tahoe, Stratus, Obsidian and Twilight) or `Enterprise series` (Enterprise/Blue and Graphite), or a custom skin based on one of those - including any skin generated by the `Skin Editor`.
    - even in Enterprise-series skins, `tree connector lines` vertically stretch, becoming obviously blurry and misshapen with an increase of 4-5px. To avoid this, replace the tree connector media (see `TreeGrid.connectorImage`).
    - `FormItemIcon`s are not resized by default, because stretched icons generally look worse than non-scaled icons that are a bit smaller than the input field
    - images that use `spriting` will not be stretched because the sizes for these controls are embedded in CSS. In most cases, this is desirable; for example, the downward chevron shape used for SelectItem controls doesn't stretch, and looks better that way.
    Parameters:
      `delta` - number of pixels to increase or decrease from current size

  - ### resizeControlsTo

    public static void resizeControlsTo(int targetDelta)
    Resizes controls as if calling `resizeControls()`, but takes a final target size instead of a delta representing the change from a current size. Note that all the same limitations apply.
    Parameters:
      `targetDelta` - the final size, expressed as a differential from the default

  - ### resizeFonts

    public static void resizeFonts(int sizeChange)
    Modify the size of fonts for some or all stylesheets defined in the page.

    This method can be used to dynamically increase or decrease font size for all of the fonts in your application, or just fonts defined in your chosen Smart GWT skin (the latter can be achieved by passing `styleSheets` as "skin_styles.css" - the default name for the CSS file used in each Smart GWT skin).

    `resizeFonts()` must be called after the skin has been loaded, and before any components have been created. Calling `resizeFonts()` at a later time is not supported (you will notice that font sizes still increase, however, this approach is not supported).

    Some browsers will disallow access or modification of styleSheets if they are loaded from a domain that is different from the loading page. In this case `resizeFonts()` cannot be used.

    This method has a small performance penalty which depends on the browser, number of stylesheets being modified, and age of your machine. With modern browsers on modern machines resizing just skin fonts, the impact is basically negligible (<5ms).

    Certain controls such as icons are resized when fonts are resized (see `setAutoResizeIcons()` and `setAutoResizeAutoChildAttributes()`) so you might want to set `resizeRelatedControls` to `false` where you are just trying to make fonts in a dynamically loaded stylesheet match previously loaded fonts, but controls such as icons should not be resized upwards again.

    Parameters:
      `sizeChange` - size to change fonts by. Can be negative to shrink fonts

  - ### resizeFonts

    public static void resizeFonts(int sizeChange, String styleSheets)
    See `resizeFonts()`

  - ### resizeFonts

    public static void resizeFonts(int sizeChange, String styleSheets, Boolean resizeRelatedControls)
    Modify the size of fonts for some or all stylesheets defined in the page.

    This method can be used to dynamically increase or decrease font size for all of the fonts in your application, or just fonts defined in your chosen Smart GWT skin (the latter can be achieved by passing `styleSheets` as "skin_styles.css" - the default name for the CSS file used in each Smart GWT skin).

    `resizeFonts()` must be called after the skin has been loaded, and before any components have been created. Calling `resizeFonts()` at a later time is not supported (you will notice that font sizes still increase, however, this approach is not supported).

    Some browsers will disallow access or modification of styleSheets if they are loaded from a domain that is different from the loading page. In this case `resizeFonts()` cannot be used.

    This method has a small performance penalty which depends on the browser, number of stylesheets being modified, and age of your machine. With modern browsers on modern machines resizing just skin fonts, the impact is basically negligible (<5ms).

    Certain controls such as icons are resized when fonts are resized (see `setAutoResizeIcons()` and `setAutoResizeAutoChildAttributes()`) so you might want to set `resizeRelatedControls` to `false` where you are just trying to make fonts in a dynamically loaded stylesheet match previously loaded fonts, but controls such as icons should not be resized upwards again.

    Parameters:
      `sizeChange` - size to change fonts by. Can be negative to shrink fonts
      `styleSheets` - optional regular expression pattern for matching stylesheets
      `resizeRelatedControls` - resize icons and autoChild attributes? Set to false to suppress default behavior.

  - ### resizeFontsTo

    public static void resizeFontsTo(int targetDelta)
    Resizes fonts as if calling `resizeFonts()`, but takes a final target size instead of a delta representing the change from a current size. Note that all the same limitations apply.
    Parameters:
      `targetDelta` - the final size, expressed as a differential from the default

  - ### resizeIcons

    public static void resizeIcons(String policy, int delta)
    Change the basic size of icons in the current skin by "delta" pixels. This method may be invoked automatically from `resizeControls()`.

    Must be called after the skin has been loaded, but before any components are created.

    Parameters:
      `policy` - Which set of icons should be resized? This should correspond to the iconSizingPolicy argument applied when `registering the icon sizing attributes`.
      `delta` - number of pixels to increase or decrease from current size

  - ### resizePadding

    public static void resizePadding(int fontSizeChange)
    Modify the amount of padding for some CSS styles defined for the page. Only CSS styles registered by `registerFontScaledPaddingStyles()` are modified.

    `resizePadding()` must be called after the skin has been loaded, and before any components have been created. Calling `resizePadding()` at a later time is not supported (you will notice that padding is modified, however, this approach is not supported).

    This method has similar browser security limitations as `resizeFonts()`.

    The intent is that the same font size change be passed to this method as is passed to `resizeFonts()`, so that the `targetSizeChange` in the call to `registerFontScaledPaddingStyles()` represents the right font size for the unadjusted styles being registered.

    Parameters:
      `fontSizeChange` - size change to apply to the padding of registered styles, so that they aren't changed at all at the size change passed to `registerFontScaledPaddingStyles()`, and the padding is reduced to baseline style levels at a zero size change.
    See Also:
      - `resizeFonts(int)`
      - `resizeControls(int)`

  - ### resizePadding

    public static void resizePadding(int fontSizeChange, String styleSheets)
    Modify the amount of padding for some CSS styles defined for the page. Only CSS styles registered by `registerFontScaledPaddingStyles()` are modified.

    `resizePadding()` must be called after the skin has been loaded, and before any components have been created. Calling `resizePadding()` at a later time is not supported (you will notice that padding is modified, however, this approach is not supported).

    This method has similar browser security limitations as `resizeFonts()`.

    The intent is that the same font size change be passed to this method as is passed to `resizeFonts()`, so that the `targetSizeChange` in the call to `registerFontScaledPaddingStyles()` represents the right font size for the unadjusted styles being registered.

    Parameters:
      `fontSizeChange` - size change to apply to the padding of registered styles, so that they aren't changed at all at the size change passed to `registerFontScaledPaddingStyles()`, and the padding is reduced to baseline style levels at a zero size change.
      `styleSheets` - optional regular expression pattern for matching stylesheets
    See Also:
      - `resizeFonts(int)`
      - `resizeControls(int)`

  - ### setAllowExternalFilters

    public static void setAllowExternalFilters(boolean allExternalFilters)
    Changes the system-wide `allowExternalFilters` setting.
    Parameters:
      `allExternalFilters` - new setting

  - ### setAutoResizeAutoChildAttributes

    public static void setAutoResizeAutoChildAttributes(boolean autoResize)
    Should registered autoChild attributes be automatically resized with `controls` and `text`?

    If true, attributes registered for resize with policy `"controls"` will be resized when `resizeControls()` runs, and icons registered with policy `"fonts"` will resize when `resizeFonts()` runs.

    To resize autoChild attributes with other policies, developers should call `resizeAutoChildAttributes()` directly

    Parameters:
      `autoResize` - true if attributes should be auto-resized

  - ### setAutoResizeIcons

    public static void setAutoResizeIcons(boolean autoResizeIcons)
    Should icons be automatically resized with `controls` and `text`?

    If true, icon attributes registered for resize with policy `"controls"` will be resized when `resizeControls()` runs, and icons registered with policy `"fonts"` will resize when `resizeFonts()` runs.

    To resize icons with other policies, developers should call `resizeIcons()` directly

    Parameters:
      `autoResizeIcons` - true if icons should be auto-resized

  - ### setDefaultPageSpace

    public static void setDefaultPageSpace(int newDefaultPageSpace)
    Changes the global `defaultPageSpace`.
    Parameters:
      `newDefaultPageSpace` - the new value for `defaultPageSpace`.

  - ### setNeverUseFilters

    public static void setNeverUseFilters(boolean neverUseFilters)
    Changes the system-wide `neverUseFilters` setting.
    Parameters:
      `neverUseFilters` - new setting

  - ### startDebuggingOverflow

    public static void startDebuggingOverflow(DebugOverflowSettings settings)
    Start to track and report excessive overflow per the supplied settings.
    Parameters:
      `settings` -
    See Also:
      - `stopDebuggingOverflow()`

  - ### stopDebuggingOverflow

    public static void stopDebuggingOverflow()
    Stop tracking and reporting excessive overflow.
    See Also:
      - `startDebuggingOverflow(com.smartgwt.client.tools.DebugOverflowSettings)`

  - ### setDefaultProperties

    public static void setDefaultProperties(Canvas canvasProperties)
    Class level method to set the default properties of this class. If set, then all existing and subsequently created instances of this class will automatically have default properties corresponding to the properties set on the SmartGWT class instance passed to this function before its underlying SmartClient JS object was created. This is a powerful feature that eliminates the need for users to create a separate hierarchy of subclasses that only alter the default properties of this class. Can also be used for skinning / styling purposes.

    Note: This method is intended for setting default attributes only and will affect all instances of the underlying class (including those automatically generated in JavaScript). This method should not be used to apply standard EventHandlers or override methods for a class - use a custom subclass instead. Calling this method after instances have been created can result in undefined behavior, since it bypasses any setters and a class instance may have already examined a particular property and not be expecting any changes through this route.

    Parameters:
      `canvasProperties` - properties that should be used as new defaults when instances of this class are created
    See Also:
      - `SGWTProperties`

  - ### getTestInstance

    protected Canvas getTestInstance()

  - ### getById

    public static Canvas getById(String ID)
    Retrieve a Canvas by its global `ID`.
    Parameters:
      `ID` - global ID of the Canvas
    Returns:
      the Canvas, or null if not found or not a Canvas

  - ### getByJSObject

    public static Canvas getByJSObject(JavaScriptObject jsObj)
    Retrieve a Canvas from its `JavaScriptObject`.
    Parameters:
      `jsObj` - SmartClient object associated with Canvas
    Returns:
      the Canvas, or null if not found or not a Canvas

  - ### setElement

    protected void setElement(Element elem)
    Normal usage of SmartGWT is to call draw() on SmartGWT widgets, not to use use RootPanel.add(). Developers will not typically need to call getElement() or setElement() for SmartGWT canvas instances. If developers do need to access the DOM elements created by a drawn SmartGWT component, they should use `getOuterElement()` and `getContentElement()`. See the javadoc for those methods for more information. Note particularly that these elements should not be directly manipulated in the DOM - instead standard SmartGWT APIs such as draw(), clear(), setContents(), addChild(), redraw() should be used. See also `setHtmlElement(Element)` for how to embed a SmartGWT component into an existing DOM element.

    getElement() and setEleent() exist solely to support adding SmartGWT widgets to a core GWT layout manager. This usage has limitations and caveats - see this list of <a href=http://forums.smartclient.com/showthread.php?t=8159#aMix>Frequently Asked Questions.

    The mechanism that getElement() uses to integrate with core GWT is the same as that described for `com.smartgwt.client.widgets.Canvas#setHTMLElement(Element)` and has the same caveats

    Overrides:
      `setElement` in class `UIObject`

  - ### getElement

    public Element getElement()
    Normal usage of SmartGWT is to call draw() on SmartGWT widgets, not to use use RootPanel.add(). Developers will not typically need to call getElement() or setElement() for SmartGWT canvas instances. If developers do need to access the DOM elements created by a drawn SmartGWT component, they should use `getOuterElement()` and `getContentElement()`. See the javadoc for those methods for more information. Note particularly that these elements should not be directly manipulated in the DOM - instead standard SmartGWT APIs such as draw(), clear(), setContents(), addChild(), redraw() should be used. See also `setHtmlElement(Element)` for how to embed a SmartGWT component into an existing DOM element.

    getElement() and setEleent() exist solely to support adding SmartGWT widgets to a core GWT layout manager. This usage has limitations and caveats - see this list of <a href=http://forums.smartclient.com/showthread.php?t=8159#aMix>Frequently Asked Questions.

    The mechanism that getElement() uses to integrate with core GWT is the same as that described for `com.smartgwt.client.widgets.Canvas#setHTMLElement(Element)` and has the same caveats

    Overrides:
      `getElement` in class `UIObject`

  - ### getElement

    public Element getElement(boolean allowPreRender)
    Parameters:
      `allowPreRender` -
    Returns:
    See Also:
      - `UIObject.getElement()`

  - ### asSGWTComponent

    public static <T extends Canvas> T asSGWTComponent(JavaScriptObject jsObj)
    Returns the existing SGWT widget, or creates and returns one if none exist, associated with the supplied `JavaScriptObject`. If the supplied object is not a SmartClient Canvas, a warning will be logged and null returned; otherwise the widget will be returned as the appropriate subtype of SGWT Canvas.
    Parameters:
      `jsObj` - SmartClient Canvas whose wrapper is wanted
    Returns:
      wrapping SGWT Canvas, appropriately subtyped, or null

  - ### getByLocalId

    public Canvas getByLocalId(String ID)
    Retrieve a child of this Canvas by it's local ID.

    A "local ID" is name for a child widget which is unique only for this parent, and not globally unique as is required for `ID`. Widgets receive local IDs when loaded via `com.smartgwt.client.client.rpc.RPCManager#loadScreen()` or `com.smartgwt.client.rpc.RPCManager#cacheScreens()` and `com.smartgwt.client.rpc.RPCManager#createScreen()`.

    Parameters:
      `ID` - global ID of the Canvas
    Returns:
      the Canvas, or null if not found

  - ### getClassName

    public String getClassName()
    Returns the JavaScript class name.
    Overrides:
      `getClassName` in class `BaseWidget`
    Returns:
      the JavaScript class name.

  - ### setInitHandler

    public void setInitHandler(CanvasInitHandler initHandler)
    Specify a notification method to fire when this Canvas is initialized in JavaScript. This allows developers to set up form item state dynamically when the item is created.
    Parameters:
      `initHandler` -

  - ### onInit

    protected void onInit()
    Overrides:
      `onInit` in class `BaseWidget`

  - ### onDetach

    protected void onDetach()
    Overrides:
      `onDetach` in class `Widget`

  - ### onAttach

    protected void onAttach()
    Overrides:
      `onAttach` in class `Widget`

  - ### addStyleName

    public void addStyleName(String style)
    Multiple styles are currently not supported. This method essentially calls `setStyleName(String)`
    Overrides:
      `addStyleName` in class `UIObject`
    Parameters:
      `style` - the style name
    See Also:
      - `setStyleName(String)`

  - ### setVisible

    public void setVisible(boolean visible)
    Specified by:
      `setVisible` in interface `HasVisibility`
    Overrides:
      `setVisible` in class `UIObject`

  - ### setHeight

    public Canvas setHeight(int height)
    See Also:
      - `setHeight(Integer)`

  - ### setHeight100

    public Canvas setHeight100()
    Convenience method that sets the height to 100%.

  - ### getHeightAsString

    public String getHeightAsString()

  - ### setTitle

    public void setTitle(String title)
    Synonym for `setPrompt(String)`
    Overrides:
      `setTitle` in class `BaseWidget`
    Parameters:
      `title` - the title

  - ### getTitle

    public String getTitle()
    Synonym for `getPrompt()`
    Overrides:
      `getTitle` in class `BaseWidget`
    Returns:
      the title

  - ### setTooltip

    public Canvas setTooltip(String tooltip)
    Synonym for `setPrompt(String)`
    Parameters:
      `tooltip` - the tooltip
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getTooltip

    public String getTooltip()
    Synonym for `getPrompt()`
    Returns:
      the tooltip

  - ### setWidth

    public Canvas setWidth(int width)
    See Also:
      - `setWidth(Integer)`

  - ### setWidth100

    public Canvas setWidth100()
    Convenience method that sets the width to 100%.

  - ### getWidthAsString

    public String getWidthAsString()

  - ### getLeftAsString

    public String getLeftAsString()
    Number of pixels the left side of the widget is offset to the right from its default drawing context (either its parent's topleft corner, or the document flow, depending on the value of the `position` property).

    Can also be set as a percentage, specified as a String ending in '%', eg, "50%". In this case the top coordinate is considered as a percentage of the specified width of the `'parent'`.

    Returns:
      Return the left coordinate of this object, relative to its enclosing context, in pixels.

  - ### getFacetId

    public String getFacetId()
    If a Canvas is dropped onto a `CubeGrid`, and it has a `facetId` property specified then the Cube treats this as adding that facetId at the drop location.
    Returns:
      the facet id

  - ### setFacetId

    public Canvas setFacetId(String facetId)
    If a Canvas is dropped onto a `CubeGrid`, and it has a facetId property specified then the Cube treats this as adding that facetId at the drop location.
    Parameters:
      `facetId` - the facet id
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getTopAsString

    public String getTopAsString()
    Number of pixels the top of the widget is offset down from its default drawing context (either its parent's top-left corner, or the document flow, depending on the value of the `position` property).

    Can also be set as a percentage, specified as a String ending in '%', eg, "50%". In this case the top coordinate is considered as a percentage of the specified height of the `'parent'`.

    Returns:
      Return the top coordinate of this object, relative to its enclosing context, in pixels.

  - ### setAlign

    public Canvas setAlign(Alignment align)

  - ### getAbsoluteLeft

    public int getAbsoluteLeft()
    This method is similar to `getPageLeft()`.
    Overrides:
      `getAbsoluteLeft` in class `UIObject`
    Returns:

  - ### getAbsoluteTop

    public int getAbsoluteTop()
    This method is similar to `getPageTop()`.
    Overrides:
      `getAbsoluteTop` in class `UIObject`
    Returns:

  - ### setAnimateShowEffect

    public Canvas setAnimateShowEffect(AnimationEffect animateShowEffect)
    Default animation effect to use if `animateShow()` is called without an explicit effect parameter.
    Parameters:
      `animateShowEffect` - the animate show effect. Default is "wipe"
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getAnimateShowEffect

    public AnimationEffect getAnimateShowEffect()
    Default animation effect to use if `animateShow()` is called without an explicit effect parameter.
    Returns:
      animation effect. Default value is "wipe"

  - ### getAnimateHideEffect

    public AnimationEffect getAnimateHideEffect()
    Default animation effect to use if `animateHide()` is called without an explicit effect parameter.
    Returns:
      animation effect. Default value is "wipe"

  - ### setAnimateHideEffect

    public Canvas setAnimateHideEffect(AnimationEffect animateHideEffect)
    Default animation effect to use if `animateHide()` is called without an explicit effect parameter.
    Parameters:
      `animateHideEffect` - the animate show effect. Default is "wipe"
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### setDisabled

    public Canvas setDisabled(boolean disabled)
    If set to true, the widget will be disabled. A widget is only considered enabled if it is individually enabled and all parents above it in the containment hierarchy are enabled. This allows you to enable or disable all components of a complex nested widget by enabling or disabling the top-level parent only. set the disabled state of this object

    Note : This is an advanced setting

    Parameters:
      `disabled` - new disabled state of this object - pass `true` to disable the widget. Default value is false
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getDisabled

    public boolean getDisabled()
    If set to true, the widget will be disabled. A widget is only considered enabled if it is individually enabled and all parents above it in the containment hierarchy are enabled. This allows you to enable or disable all components of a complex nested widget by enabling or disabling the top-level parent only.
    Returns:
      Is this canvas disabled? Note that the disabled state is inherited - this method will return true if this widget, or any of its ancestors are marked disabled.

  - ### willAcceptDrop

    public Boolean willAcceptDrop()
    Returns true if the widget object being dragged can be dropped on this widget, and false or null otherwise. The default implementation of this method simply compares the `dragType` of the `dragTarget` (the component being dragged from) with the list of `dropTypes` on this Canvas. If the `dropTypes` list contains the `dragType` value, then this method returns true. Otherwise it returns false.

    No matter what you return, the `onDropOver` and `onDropMove` handlers will still be called, and their return value will control whether those events are bubbled to parent elements.

    However, what you return from `willAcceptDrop()` does determine whether the `onDrop` handler will be called.

    - If you return true, then `onDrop()` will be called, and its return value will determine whether the event is bubbled to parent elements.
    - If you return false, then `onDrop()` will not be called, and the event will not be bubbled.
    - If you return null, then `onDrop()` will not be called, but the event will be bubbled to parent elements (giving them a chance to handle the drop).

    So, you should return false to definitively deny a drop, and return null if it could make sense to allow a parent element (such as a `Layout`) to handle the drop.

    Note: This is an override point

    Returns:
      true if the widget object being dragged can be dropped on this widget, false if it cannot (and a drop event should not be bubbled), and null to permit a drop event to bubble to parent elements.

  - ### parentResized

    protected void parentResized()
    Fires when the interior size of the parent changes, including parent resize and scrollbar introduction or removal.

    This method allows a child to implement a layout policy that can be used within any parent, such as a Resizer component that always snaps to the parent's bottom-right corner. The default implementation of this method applies a child's percent sizes, if any, or implements layout based on the `snapTo` property.

    Make sure you call super.parentResized() if you'd like the default behavior to apply.
    Note: This is an override point

  - ### getHoverComponent

    public Canvas getHoverComponent()
    When `showHoverComponents` is true, this method is called to get the component to show as a hover for this Canvas. There is no default implementation of this method, so you need to override it with an implementation that returns a Canvas that suits your needs.

    By default, components returned by `getHoverComponent()` will not be automatically destroyed when the hover is hidden. To enforce this, set `hoverAutoDestroy` to true on the returned component.
    Note: this is an override point

    Returns:
      the component to show as a hover

  - ### setSmoothFade

    public Canvas setSmoothFade(Boolean smoothFade) throws IllegalStateException
    Throws:
      `IllegalStateException`

  - ### setKeepInParentRect

    public Canvas setKeepInParentRect(Rectangle rectangle)

  - ### setPrefix

    public Canvas setPrefix(String prefix)

  - ### getPrefix

    public String getPrefix()

  - ### setResizeFrom

    public Canvas setResizeFrom(String... resizeFrom)
    Deprecated.
    use `#setResizeFrom(EdgeName)` instead.
    Allows resizing in certain edges or corners. The default value of null indicates that the widget is resizable from any corner or edge. To restrict resizing to only certain corners, set resizeFrom to an array of any of the values listed:
    T top edge
    B bottom edge
    L left edge
    R right edge
    TL top-left corner
    TR top-right corner
    BL bottom-left corner
    BR bottom-right corner
    E.g. setting this property to a value of ["R","TR","BR"] would restrict resizing to the right edge, top-right corner and bottom-right corner only
    Parameters:
      `resizeFrom` - resizeFrom values
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### resizeTo

    public Boolean resizeTo(String width, String height)
    Resizes the widget to the specified width and height (moves the right and/ or bottom sides of the widget). The width and height parameters can be expressed as a percentage of viewport size or as the number of pixels.
    Parameters:
      `width` - new width for canvas
      `height` - new height for canvas
    Returns:
      whether the size actually changed

  - ### setProportionalResizeModifiers

    public Canvas setProportionalResizeModifiers(String... proportionalResizeModifiers) throws IllegalStateException
    If `proportionalResizing` is set to `ProportionalResizeMode.MODIFIER` or `ProportionalResizeMode.MODIFIER_OFF` then proportional resizing of the DrawItem is activated or deactivated, respectively, whenever at least one key in this set of modifier keys is pressed.

    The keys allowed in this set are: "Alt", "Ctrl", and "Shift". If this set of keys is empty then proportional resizing is always used if `proportionalResizing` is `MODIFIER` and is never used if `proportionalResizing` is `MODIFIER_OFF`.

    Parameters:
      `proportionalResizeModifiers` - Default value is ["Shift"]
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - this property cannot be changed after the underlying component has been created

  - ### getProportionalResizeModifiers

    public String[] getProportionalResizeModifiers()
    If `proportionalResizing` is set to `ProportionalResizeMode.MODIFIER` or `ProportionalResizeMode.MODIFIER_OFF` then proportional resizing of the DrawItem is activated or deactivated, respectively, whenever at least one key in this set of modifier keys is pressed.

    The keys allowed in this set are: "Alt", "Ctrl", and "Shift". If this set of keys is empty then proportional resizing is always used if `proportionalResizing` is `MODIFIER` and is never used if `proportionalResizing` is `MODIFIER_OFF`.

    Returns:
      String...

  - ### isVisible

    public boolean isVisible()
    Returns true if the widget is visible, taking all parents into account, so that a widget which is not hidden might still report itself as not visible if it is within a hidden parent.

    NOTE: Undrawn widgets will report themselves as visible if they would be visible if drawn.

    Specified by:
      `isVisible` in interface `HasVisibility`
    Overrides:
      `isVisible` in class `UIObject`
    Returns:
      true if the widget is visible, false otherwise
    See Also:
      - `Visibility overview and related methods`

  - ### scrollTo

    public void scrollTo(Double left)
    Scrolls the content of the widget like `scrollTo()`, but with a full-precision double offset so that numerical error can be avoided in situations where it otherwise may accumulate in calculations.

  - ### scrollTo

    public void scrollTo(Double left, Double top)
    Scrolls the content of the widget like `scrollTo()`, but with full-precision double offsets so that numerical error can be avoided in situations where it otherwise may accumulate in calculations.

  - ### animateScroll

    public void animateScroll(int scrollLeft, int scrollTop, AnimationCallback callback)
    Animate a scroll from the current scroll position to the specified position.
    Parameters:
      `scrollLeft` - desired final left scroll postion
      `scrollTop` - desired final top scroll postion
      `callback` - When the scroll completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short by a call to finishAnimation

  - ### animateScroll

    public void animateScroll(int scrollLeft, int scrollTop, AnimationCallback callback, int duration)
    Animate a scroll from the current scroll position to the specified position.
    Parameters:
      `scrollLeft` - desired final left scroll postion
      `scrollTop` - desired final top scroll postion
      `callback` - When the scroll completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short by a call to finishAnimation
      `duration` - Duration in ms of the animated scroll

  - ### animateFade

    public void animateFade(int opacity)
    Animate a change in opacity from the widget's current opacity to the specified opacity.
    Parameters:
      `opacity` - desired final opacity

  - ### animateFade

    public void animateFade(int opacity, AnimationCallback callback)
    Animate a change in opacity from the widget's current opacity to the specified opacity.
    Parameters:
      `opacity` - desired final opacity
      `callback` - When the fade completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short by a call to finishAnimation

  - ### animateFade

    public void animateFade(int opacity, AnimationCallback callback, int duration)
    Animate a change in opacity from the widget's current opacity to the specified opacity.
    Parameters:
      `opacity` - desired final opacity
      `callback` - When the fade completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short by a call to finishAnimation
      `duration` - Duration in ms of the animated fade

  - ### animateFade

    public void animateFade(int opacity, AnimationCallback callback, int duration, AnimationAcceleration acceleration)
    Animate a change in opacity from the widget's current opacity to the specified opacity.
    Parameters:
      `opacity` - desired final opacity
      `callback` - When the fade completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short by a call to finishAnimation
      `duration` - Duration in ms of the animated fade
      `acceleration` - Animation acceleration to bias the ratios

  - ### animateHide

    public void animateHide()
    See `animateHide(AnimationEffect, AnimationCallback, int)`

  - ### animateHide

    public void animateHide(AnimationEffect effect)
    See `animateHide(AnimationEffect, AnimationCallback, int)`

  - ### animateHide

    public void animateHide(AnimateShowEffect effect)
    See `animateHide(AnimateShowEffect, AnimationCallback, int)`

  - ### animateHide

    public void animateHide(AnimationEffect effect, AnimationCallback callback)
    See `animateHide(AnimationEffect, AnimationCallback, int)`

  - ### animateHide

    public void animateHide(AnimateShowEffect effect, AnimationCallback callback)
    See `animateHide(AnimateShowEffect, AnimationCallback, int)`

  - ### animateHide

    public void animateHide(AnimationEffect effect, AnimationCallback callback, int duration)
    Hide a canvas by shrinking it vertically to zero height over a period of time. This method will not fire if the widget is already drawn and visible, or has overflow other than `"visible"` or `"hidden"`.
    Parameters:
      `effect` - How should the content of the window be hidden during the hide? If omitted, default behavior can be configured via `animateHideEffect`
      `callback` - When the hide completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short, for example by a call to the non-animated API `hide()`.
      `duration` - Duration in ms of the animated hide. If unset, duration will be picked up from `animateHideTime`

  - ### animateHide

    public void animateHide(AnimateShowEffect effect, AnimationCallback callback, int duration)
    Hide a canvas by shrinking it vertically to zero height over a period of time. This method will not fire if the widget is already drawn and visible, or has overflow other than `"visible"` or `"hidden"`.
    Parameters:
      `effect` - How should the content of the window be hidden during the hide? If omitted, default behavior can be configured via `animateHideEffect`
      `callback` - When the hide completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short, for example by a call to the non-animated API `hide()`.
      `duration` - Duration in ms of the animated hide. If unset, duration will be picked up from `animateHideTime`

  - ### animateShow

    public void animateShow()
    See `animateShow(AnimationEffect, AnimationCallback, int)`

  - ### animateShow

    public void animateShow(AnimationEffect effect)
    See `animateShow(AnimationEffect, AnimationCallback, int)`

  - ### animateShow

    public void animateShow(AnimateShowEffect effect)
    See `animateShow(AnimateShowEffect, AnimationCallback, int)`

  - ### animateShow

    public void animateShow(AnimationEffect effect, AnimationCallback callback)
    See `animateShow(AnimationEffect, AnimationCallback, int)`

  - ### animateShow

    public void animateShow(AnimateShowEffect effect, AnimationCallback callback)
    See `animateShow(AnimateShowEffect, AnimationCallback, int)`

  - ### animateShow

    public void animateShow(AnimationEffect effect, AnimationCallback callback, int duration)
    Show a canvas by growing it vertically to its fully drawn height over a period of time. This method will not fire if the widget is already drawn and visible, or has overflow other than `"visible"` or `"hidden"`.
    Parameters:
      `effect` - Animation effect to use when revealing the widget. If omitted, default behavior can be configured via `animateShowEffect`
      `callback` - When the show completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short, for example by a call to the non-animated API `show()`.
      `duration` - Duration in ms of the animated show. If unset, duration will be picked up from `animateShowTime`

  - ### animateShow

    public void animateShow(AnimateShowEffect effect, AnimationCallback callback, int duration)
    Show a canvas by growing it vertically to its fully drawn height over a period of time. This method will not fire if the widget is already drawn and visible, or has overflow other than `"visible"` or `"hidden"`.
    Parameters:
      `effect` - Animation effect to use when revealing the widget. If omitted, default behavior can be configured via `animateShowEffect`
      `callback` - When the show completes this callback will be fired. Single 'earlyFinish' parameter will be passed if the animation was cut short, for example by a call to the non-animated API `show()`.
      `duration` - Duration in ms of the animated show. If unset, duration will be picked up from `animateShowTime`

  - ### updateShadow

    public void updateShadow()
    Update the canvas shadow.

  - ### getZIndex

    public int getZIndex()
    Get the z-Index of this canvas.
    Returns:
      the zIndex

  - ### getNextZIndex

    public int getNextZIndex()
    get the next zIndex for the next item to be drawn. see setZIndex() for notes
    Returns:
      the next zIndex

  - ### setZIndex

    public Canvas setZIndex(int newIndex)
    Set the z-Index of the canvas.
    Parameters:
      `newIndex` - the new zIndex to set to
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getPageRect

    public Rectangle getPageRect()

  - ### setRect

    public Canvas setRect(Rectangle rectangle)
    Set all four coordinates, relative to the enclosing context, at once.

    Moves the widget so that its top-left corner is at the specified top-left coordinates, then resizes it to the specified width and height.

    Parameters:
      `rectangle` - new coordinates
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### setRect

    public Canvas setRect(int left, int top, int width, int height)
    Set all four coordinates, relative to the enclosing context, at once.

    Moves the widget so that its top-left corner is at the specified top-left coordinates, then resizes it to the specified width and height.

    Parameters:
      `left` - new left coordinate
      `top` - new top coordinate
      `width` - new width
      `height` - new height
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getRect

    public Rectangle getRect()
    Returns the coordinates of this object as an array in left, top, width, height order.

    Returns:
      Rectangle containing the left, top, width, height of the widget
    See Also:
      - `Positioning overview and related methods`

  - ### getImgURL

    public static String getImgURL(String URL)
    Return the full URL for an image to be drawn in this canvas.

    If the passed URL begins with the special prefix "[SKIN]", it will have the widget.skinImgDir and Page.skinImgDir prepended. Otherwise the image is assumed to be application-specific, and will have the widget.appImgDir and Page.appImgDir automatically prepended.

    Note that if passed an absolute path (starting with "/" or "http://" for example), no extra image directory information will be prepended to the generated URL.//

    Parameters:
      `URL` - URL local to skin or application image directory
    Returns:
      URL to use

  - ### getImgURL

    public static String getImgURL(String URL, String imgDir)
    Return the full URL for an image to be drawn in this canvas.

    If the passed URL begins with the special prefix "[SKIN]", it will have the widget.skinImgDir and Page.skinImgDir prepended. Otherwise the image is assumed to be application-specific, and will have the widget.appImgDir and Page.appImgDir automatically prepended.

    Note that if passed an absolute path (starting with "/" or "http://" for example), no extra image directory information will be prepended to the generated URL.//

    Parameters:
      `URL` - URL local to skin or application image directory
      `imgDir` - optional image directory to override the default for this Canvas
    Returns:
      URL to use

  - ### imgHTML

    public static String imgHTML(String src)
    Generates the HTML for an image unique to this Canvas.

    The full URL for the image will be formed according to the rules documented for ``getImgURL(java.lang.String)``.

    The created image will have an identifier unique to this Canvas, and subsequent calls to ``getImage(java.lang.String)`` and ``setImage(java.lang.String, java.lang.String)`` with the name passed to this function will act on the image object produced by the HTML returned from this call.

    Parameters:
      `src` - URL local to the skin or application directory.
      NOTE: instead of passing several parameters, you can pass an object as the 'src' parameter with properties for all the various function parameters with, eg:
      canvas.imgHTML( {src:"foo", width:10, height:10} );
    Returns:
      HTML to draw the image.

  - ### imgHTML

    public static String imgHTML(String src, int width, int height, String name, String extraStuff, String imgDir)
    Generates the HTML for an image unique to this Canvas.

    The full URL for the image will be formed according to the rules documented for ``getImgURL(java.lang.String)``.

    The created image will have an identifier unique to this Canvas, and subsequent calls to ``getImage(java.lang.String)`` and ``setImage(java.lang.String, java.lang.String)`` with the name passed to this function will act on the image object produced by the HTML returned from this call.

    Parameters:
      `src` - URL local to the skin or application directory.
      NOTE: instead of passing several parameters, you can pass an object as the 'src' parameter with properties for all the various function parameters with, eg:
      canvas.imgHTML( {src:"foo", width:10, height:10} );
      `width` - width of the image
      `height` - height of the image
      `name` - name for the image
      `extraStuff` - additional attributes to write in the tag
      `imgDir` - image-specific image directory to override the default for this Canvas
    Returns:
      HTML to draw the image.

  - ### imgHTML

    public static String imgHTML(String src, int width, int height)

  - ### showPrintPreview

    public static void showPrintPreview(Canvas component)
    Show a PrintWindow containing a printable view of the component passed in containing print HTML.
    Parameters:
      `component` - to get printable HTML for.

  - ### showPrintPreview

    public static void showPrintPreview(Object[] components)
    Show a Print containing a printable view of the components passed in.
    Parameters:
      `components` - components to get the print HTML for. May also include raw HTML strings which will be folded into the generated print output

  - ### showPrintPreview

    public static void showPrintPreview(Object[] components, PrintProperties printProperties, String title, PrintPreviewCallback callback)
    Show a Print containing a printable view of the components passed in.
    Parameters:
      `components` - components to get the print HTML for. May also include raw HTML strings which will be folded into the generated print output
      `printProperties` - for customizing the print HTML output. If this parameter is passed as null, it will be ignored.
      `title` - for the print window
      `callback` - to fire when the print preview window has been created and shown

  - ### showPrintPreview

    public static void showPrintPreview(Object[] components, PrintProperties printProperties, String title, PrintPreviewCallback callback, Window printWindowProperties, String printButtonTitle)
    Show a Print containing a printable view of the components passed in.
    Parameters:
      `components` - components to get the print HTML for. May also include raw HTML strings which will be folded into the generated print output
      `printProperties` - for customizing the print HTML output. If this parameter is passed as null, it will be ignored.
      `title` - for the print window
      `callback` - to fire when the print preview window has been created and shown
      `printWindowProperties` - the print window properties
      `printButtonTitle` - the brint button title

  - ### getPrintHTML

    public static void getPrintHTML(Object[] components, PrintProperties printProperties, PrintHTMLCallback callback)
    Returns print-formatted HTML for the specified list of components.
    Parameters:
      `components` - Components to get the print HTML for. Strings of raw HTML may also be included in this array, and will be integrated into the final HTML at the appropriate point. `HTML`.
      `printProperties` - for customizing the print HTML output. If this parameter is passed as null, it will be ignored.
      `callback` - to fire when the HTML has been generated
    See Also:
      - `getPrintHTML(PrintProperties, PrintHTMLCallback)`

  - ### getPrintHTML

    public String getPrintHTML(PrintProperties printProperties, PrintHTMLCallback callback)
    Retrieves printable HTML for this component and all printable subcomponents.

    By default any Canvas with children will simply collect the printable HTML of its children by calling getPrintHTML() on each child that is considered `printable`. If a callback is provided, then null is always returned and the callback is fired asynchronously.

    If overriding this method for a custom component, you should either return a String of printable HTML directly or return null and fire the provided callback using Class.fireCallback().

    To return an empty print representation, return an empty string ("") rather than null.

    The `printProperties` argument, if passed, must be passed to any subcomponents on which `getPrintHTML()` is called.

    Default implementation will set {@link* com.smartgwt.client.widgets.Canvas#getIsPrinting isPrinting} flag to `true` to indicate printing is in* progress, and clear this flag when the printing has completed (possibly via an asynchronous callback).

    NOTE: Expecting a direct return value from the default implementation is deprecated usage. This is because small changes to an application (such as adding a few more data points to a chart or adding another button) or using certain browsers can make it necessary to generate the HTML asynchronously. Thus, application code should not rely on the return value and always pass a callback.

    NOTE: CubeGrid does not support a WYSIWYG print view by default (also used when `exporting to pdf`). Instead we recommend `exporting to excel or csv format`.

    Parameters:
      `printProperties` - properties to configure printing behavior - may be null.
      `callback` - optional callback. This is required to handle cases where HTML generation is asynchronous - if a method generates HTML asynchronously, it should return null, and fire the specified callback on completion of HTML generation. The first parameter `HTML` should contain the generated print HTML. The callback is only called if null is returned. Furthermore, the default getPrintHTML() implementation always returns null and fires the callback when a callback is provided. See `Callback`.
    Returns:
      null if the print HTML is being generated asynchronously and/or a callback is provided; otherwise, the direct print HTML for this component (but note that returning direct print HTML is a deprecated feature).
    See Also:
      - `Printing overview and related methods`

  - ### printComponents

    public static void printComponents(Object[] components)
    Generate printable HTML for the designated components and trigger the native print dialog, without ever showing the printable HTML to the user.
    Parameters:
      `components` - components to get the print HTML for. May also include raw HTML strings which will be folded into the generated print output

  - ### setAutoChildConstructor

    public Canvas setAutoChildConstructor(String autoChildName, String className)
    Sets the SmartClient constructor for the AutoChild named `autoChildName`.
    Parameters:
      `autoChildName` - the name of the AutoChild
      `className` - the SmartClient class name to use when constructing the AutoChild.
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `AutoChildUsage`

  - ### setAutoChildProperties

    public Canvas setAutoChildProperties(String autoChildName, Canvas properties) throws IllegalStateException
    Sets the properties for creating a `Canvas` AutoChild named `autoChildName`.

    `properties` must not have already been created (`properties.isCreated()` must be `false`).

    NOTE: Overrides at override points are not applied to AutoChildren created from `properties`; that is, if the Java `Class` of `properties` overrides a Smart GWT override point, the custom method implementation will not be called.

    Parameters:
      `autoChildName` - the name of the AutoChild
      `properties` - AutoChild configuration
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - if `properties` has been created.
    See Also:
      - `AutoChildUsage`

  - ### setAutoChildProperties

    public Canvas setAutoChildProperties(String autoChildName, FormItem properties) throws IllegalStateException
    Sets the properties for creating a `FormItem` AutoChild named `autoChildName`.

    `properties` must not have already been created (`properties.isCreated()` must be `false`).

    NOTE: Overrides at override points are not applied to AutoChildren created from `properties`; that is, if the Java `Class` of `properties` overrides a Smart GWT override point, the custom method implementation will not be called.

    Parameters:
      `autoChildName` - the name of the AutoChild
      `properties` - AutoChild configuration
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - if `properties` has been created.
    See Also:
      - `AutoChildUsage`

  - ### setAutoChildProperties

    public Canvas setAutoChildProperties(String autoChildName, EditProxy properties) throws IllegalStateException
    Sets the properties for creating an AutoChild named `autoChildName`.

    `properties` must not have already been created (`properties.isCreated()` must be `false`).

    Parameters:
      `autoChildName` - the name of the AutoChild
      `properties` - AutoChild configuration
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - if `properties` has been created.
    See Also:
      - `AutoChildUsage`

  - ### setAutoChildProperties

    public Canvas setAutoChildProperties(String autoChildName, EditContext properties) throws IllegalStateException
    Sets the properties for creating an AutoChild named `autoChildName`.

    `properties` must not have already been created (`properties.isCreated()` must be `false`).

    Parameters:
      `autoChildName` - the name of the AutoChild
      `properties` - AutoChild configuration
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - if `properties` has been created.
    See Also:
      - `AutoChildUsage`

  - ### setAutoChildVisibility

    public Canvas setAutoChildVisibility(String autoChildName, boolean visible)
    Sets whether to create and show the AutoChild named `autoChildName`.

    NOTE: This API is not valid for all AutoChildren because some AutoChildren cannot be hidden without destroying the main functions of the component.

    Parameters:
      `autoChildName` - name of an AutoChild
      `visible` - whether to show the AutoChild
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getCanvasAutoChild

    public final Canvas getCanvasAutoChild(String autoChildName)
    Returns the `Canvas` AutoChild named `autoChildName` if already created.
    Parameters:
      `autoChildName` - name of an AutoChild to return.
    Throws:
      `RuntimeException` - if the AutoChild is not a SmartClient `Canvas` object.
    See Also:
      - `AutoChildUsage`

  - ### getFormItemAutoChild

    public final FormItem getFormItemAutoChild(String autoChildName)
    Returns the `FormItem` AutoChild named `autoChildName` if already created.
    Parameters:
      `autoChildName` - name of an AutoChild to return.
    Throws:
      `RuntimeException` - if the AutoChild is not a SmartClient `FormItem` object.
    See Also:
      - `AutoChildUsage`

  - ### addChild

    public void addChild(Widget widget)
    Adds newChild as a child of this widget, set up a named object reference (i.e., this[name]) to the new widget if name argument is provided, and draw the child if this widget has been drawn already.

    If newChild has a parent it will be removed from it. If it has a master, it will be detached from it if the master is a child of a different parent. If newChild has peers, they'll be added to this widget as children as well.

    Parameters:
      `newChild` - new child canvas to add

  - ### addChild

    public Canvas addChild(Canvas newChild, String name, boolean autoDraw)
    Adds newChild as a child of this widget, set up a named object reference (i.e., this[name]) to the new widget if name argument is provided, and draw the child if this widget has been drawn already.

    If newChild has a parent it will be removed from it. If it has a master, it will be detached from it if the master is a child of a different parent. If newChild has peers, they'll be added to this widget as children as well.

    Parameters:
      `newChild` - new child canvas to add
      `name` - name to assign to child (eg: this[name] == child)
      `autoDraw` - if false, child will not automatically be drawn (only for advanced use)
    Returns:
      the new child, or null if it couldn't be added
    See Also:
      - `Containment overview and related methods`

  - ### setChildren

    public Canvas setChildren(Canvas... children)
    Array of all Canvii that are immediate children of this Canvas.

    Note : This is an advanced setting

    Parameters:
      `children` - children Default value is null
    Returns:
      `Canvas` instance, for chaining setter calls

  - ### getOffsetHeight

    public int getOffsetHeight()
    Overrides:
      `getOffsetHeight` in class `UIObject`

  - ### getOffsetWidth

    public int getOffsetWidth()
    Overrides:
      `getOffsetWidth` in class `UIObject`

  - ### setAutoHeight

    public Canvas setAutoHeight()
    Set the minimum value for height.

    For use with setOverflow(Overflow.VISIBLE), where widgets render only as large as their contents and/or children, and height and width settings act as a minimum size.

    Returns:
      `Canvas` instance, for chaining setter calls

  - ### setAutoWidth

    public Canvas setAutoWidth()
    Set the minimum value for width.

    For use with setOverflow(Overflow.VISIBLE), where widgets render only as large as their contents and/or children, and height and width settings act as a minimum size.

    Returns:
      `Canvas` instance, for chaining setter calls

  - ### showClickMask

    public String showClickMask(Function clickActionCallback, ClickMaskMode mode, Canvas[] unmaskedTargets)
    Show a clickMask over the entire screen that intercepts mouse clicks and fires some action. The mask created will be associated with this canvas - calling this method multiple times will not show multiple (stacked) clickMasks if the mask associated with this canvas is already up.
    The clickMask useful for modal dialogs, menus and similar uses, where any click outside of some Canvas should either be suppressed (as in a modal dialog) or just cause something (like dismissing a menu).
    Parameters:
      `clickActionCallback` - action to fire when the user clicks on the mask
      `mode` - whether to automatically hide the clickMask on mouseDown and suppress the mouseDown event from reaching the target under the mouse
      `unmaskedTargets` - initially unmasked targets for this clickMask. Note that if this is a `"hard"` mask, unmasked children of masked parents are not supported so any non-top-level widgets passed in will have their parents unmasked. Children of masked parents can never be masked.
    Returns:
      clickMask ID

  - ### visibleAtPoint

    public Boolean visibleAtPoint(int x, int y, boolean withinViewport, Canvas ignoreWidgets, Canvas upToParent)
    Does this widget contain the specified global (x,y) coordinates, and have no other widgets also at the specified position, obscuring this one? This is commonly used for (for example) drag and drop interactions.
    Parameters:
      `x` - GLOBAL x-coordinate
      `y` - GLOBAL y-coordinate
      `withinViewport` - point lies within our viewport rather than just our drawn area
      `ignoreWidgets` - If passed ignore widget(s), do not check whether those widgets occludes this one
      `upToParent` - If passed, only check for siblings occluding the component up as far as the specified parent widget
    Returns:
      true if this object contains the specified point; false otherwise
    See Also:
      - `Positioning overview and related methods`

  - ### setAriaState

    public Canvas setAriaState(String stateName, Object stateValue) throws IllegalStateException
    Set a specific ARIA state mapping for this component. Usually this does not need to be manually set. See `com.smartgwt.docs.Accessibility`.
    Parameters:
      `stateName` -
      `stateValue` -
    Returns:
      `Canvas` instance, for chaining setter calls
    Throws:
      `IllegalStateException` - ARIA state cannot be changed after the component has been created.

  - ### updateEditNode

    public void updateEditNode(EditContext editContext, EditNode editNode)
    A callback invoked for each `liveObject` by `EditContext` when the EditContext is being serialized. The liveObject may make any updates needed to the `EditNode` (or the `EditContext` as a whole) in order to be able to later recreate the objects.
    Note: This is an override point
    Parameters:
      `editContext` - the EditContext
      `editNode` - the EditNode
    See Also:
      - `EditContext.serializeAllEditNodes()`
      - `EditContext.serializeEditNodes(com.smartgwt.client.tools.EditNode[])`

  - ### setAdaptWidthByCustomizer

    public Canvas setAdaptWidthByCustomizer(AdaptWidthByCustomizer customizer)
    Set customizer that defines `adaptWidthBy`.
    Parameters:
      `AdaptWidthByCustomizer` - customizer
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `AdaptWidthByCustomizer`
      - `setCanAdaptWidth(java.lang.Boolean)`

  - ### setAdaptHeightByCustomizer

    public Canvas setAdaptHeightByCustomizer(AdaptHeightByCustomizer customizer)
    Set customizer that defines `adaptHeightBy`.
    Parameters:
      `AdaptHeightByCustomizer` - customizer
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `AdaptHeightByCustomizer`
      - `setCanAdaptHeight(java.lang.Boolean)`

  - ### provideRuleContext

    public void provideRuleContext(String dataPath, Object data)
    Provide data to the `com.smartgwt.client.widgets.Canvas#ruleScope` component, to be made available in the rule context at the specified `path`.

    `path` must be one or more valid identifiers with either dot (.) or slash (/) used as a separator.

    `data` can be any value, including both atomic values like a Boolean or String, or a nested data structure. Pass `data` as `null` to remove data from the context at the specified `path`

    `dbc` is the DataBoundComponent to be identified as the owner of the rule context contribution. This component is used to handle any conflicts between multiple components contributing to the same base path (i.e. first segment of path). For any collision an editable display (such as a form or editable grid) wins over a static display (such as a non-editable grid with a selection). Hidden components have lowest priority even if editable. For two editable components the first becomes the owner.

    Parameters:
      `path` - path where data should be made available
      `data` - data to contribute to rule context

  - ### provideRuleContext

    public void provideRuleContext(String dataPath, Object data, DataBoundComponent dbc)
    Provide data to the `com.smartgwt.client.widgets.Canvas#ruleScope` component, to be made available in the rule context at the specified `path`.

    `path` must be one or more valid identifiers with either dot (.) or slash (/) used as a separator.

    `data` can be any value, including both atomic values like a Boolean or String, or a nested data structure. Pass `data` as `null` to remove data from the context at the specified `path`

    `dbc` is the DataBoundComponent to be identified as the owner of the rule context contribution. This component is used to handle any conflicts between multiple components contributing to the same base path (i.e. first segment of path). For any collision an editable display (such as a form or editable grid) wins over a static display (such as a non-editable grid with a selection). Hidden components have lowest priority even if editable. For two editable components the first becomes the owner.

    Parameters:
      `path` - path where data should be made available
      `data` - data to contribute to rule context
      `dbc` - the DataBoundComponent contributing to ruleContext

  - ### revealChild

    public void revealChild(String childID)
    Reveals the child Canvas passed in by showing it if it is currently hidden (note, this is stub functionality, certain Canvas subclasses such as `TabSet` have more useful implementations) NOTE: This is an override point.
    Parameters:
      `childID` - the global ID of the child Canvas to reveal

  - ### revealChild

    public void revealChild(Canvas child)
    Reveals the child Canvas passed in by showing it if it is currently hidden (note, this is stub functionality, certain Canvas subclasses such as `TabSet` have more useful implementations) NOTE: This is an override point.
    Parameters:
      `child` - the child Canvas to reveal

  - ### setDefaultShowCustomScrollbars

    public static Canvas setDefaultShowCustomScrollbars(boolean showCS)
    Whether to use the browser's native scrollbars or SmartClient-based scrollbars by default for all canvases.

    This method changes the default value of `com.smartgwt.client.widgets.Canvas#showCustomScrollbars`.

    Parameters:
      `showCS` - whether to show custom (SmartGWT-based) scrollbars rather than css-scrollbars by default.
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setDefaultNativeAutoHideScrollbars(boolean)`

  - ### setDefaultNativeAutoHideScrollbars

    public static Canvas setDefaultNativeAutoHideScrollbars(boolean autoHideNativeScrollbars)
    In some platform/browser configurations, scrollable regions do not show visible scrollbars until the user attempts to interact with the region. The interaction to show the scrollbar varies by browser/OS but may include starting a trackpad scroll or simply rolling over the scrollable element.

    This method changes the value of `com.smartgwt.client.widgets.Canvas#nativeAutoHideScrollbars`.

    Parameters:
      `autoHideNativeScrollbars` - whether the native scrollbar should auto-hide by default.
    Returns:
      `Canvas` instance, for chaining setter calls
    See Also:
      - `setDefaultShowCustomScrollbars(boolean)`

  - ### setLogicalStructure

    public LogicalStructureObject setLogicalStructure(CanvasLogicalStructure s)
    Setter implementing the `LogicalStructure` interface, which supports Eclipse's logical structure debugging facility.

  - ### getLogicalStructure

    public LogicalStructureObject getLogicalStructure()
    Getter implementing the `LogicalStructure` interface, which supports Eclipse's logical structure debugging facility.
    Specified by:
      `getLogicalStructure` in interface `LogicalStructure`
    Overrides:
      `getLogicalStructure` in class `BaseWidget`