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CoverflowLayout

Package | spark.layouts
Class | public class CoverflowLayout
Inheritance | CoverflowLayout PerspectiveAnimationNavigatorLayoutBase AnimationNavigatorLayoutBase NavigatorLayoutBase LayoutBase OnDemandEventDispatcher Object

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

| This class is experimental, which means it has not been tested or documented as thoroughly as other core Apache Flex classes.

A CoverflowLayout class arranges the layout elements in a linear along with unselected items having a different z and rotation.

The horizontal position of the elements is determined by the combined reult of `horizontalAlign`, `horizontalDisplacement`, `horizontalAlignOffset` or `horizontalAlignOffsetPercent`, `elementHorizontalAlign` and `selectedHorizontalDisplacement`.

The horizontal position of the elements is determined by the combined reult of `verticalAlign`, `verticalDisplacement`, `verticalAlignOffset` or `verticalAlignOffsetPercent`, `elementVerticalAlign` and `selectedVerticalDisplacement`.

The z position of unselected elements is determined by the `maximumZ` property.

The rotation of the elements is determined by the `rotationX`, `rotationY` and `rotationZ` properties.

The color of unselected elements is determined by the `depthColor` and `depthColorAlpha` properties.

If `depthColor` has a value of -1, no color transform is applied.

The number elements or elements rendered is determined by the `numUnselectedElements` property. If `numUnselectedElements` has a value of -1 and `useVirtualLayout` has a value of true, only the elements that fit within the bound of the target are rendered, If `numUnselectedElements` has a value of -1 and `useVirtualLayout` has a value of false, all elements are rendered.

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The `<st:CoverflowLayout>` tag inherits all of the tag attributes of its superclass, and adds the following tag attributes:

    	  <st:CoverflowLayout
    	    Properties
    	 	  depthColor="-1"
    	    depthColorAlpha="1"
    	    elementHorizontalAlign="center|left|right"
    	    elementVerticalAlign="center|left|right"
    	    horizontalAlign="center|left|right"
    	    horizontalDisplacement="100"
    	    horizontalAlignOffset="0"
    	    horizontalAlignOffsetPercent="0"
    	    maximumZ="100"
    	    numUnselectedElements="-1"
    	    rotationX="0"
    	    rotationY="45"
    	    rotationZ="0"
    	    selectedHorizontalDisplacement="100"
    	    selectedVerticalDisplacement="0"
    	    verticalAlign="bottom|middle|top"
    	    verticalDisplacement="0"
    	    verticalAlignOffset="0"
    	    verticalAlignOffsetPercent="0"
    	  />

Public Properties
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| Property | Defined By
--- | --- | ---
|  | animationValue : Number [read-only] If the animationType is "direct" the animationValue will ease from 1 to 0. | AnimationNavigatorLayoutBase
|  | clipAndEnableScrolling : Boolean If true, specifies to clip the children to the boundaries of the viewport. | LayoutBase
|  | depthColor : int The color tint to apply to elements as their are moved back on the z axis. | CoverflowLayout
|  | depthColorAlpha : Number The alpha to be used for the color tint that is applied to elements as their are moved back on the z axis. | CoverflowLayout
|  | dropIndicator : DisplayObject The DisplayObject that this layout uses for the drop indicator during a drag-and-drop operation. | LayoutBase
|  | duration : Number The duration of the animation in milliseconds. | AnimationNavigatorLayoutBase
|  | easer : IEaser The easing behavior for this effect. | AnimationNavigatorLayoutBase
|  | elementHorizontalAlign : String The horizontal transform point of elements. | CoverflowLayout
|  | elements : Vector.<IVisualElement> [read-only] | NavigatorLayoutBase
|  | elementVerticalAlign : String The vertical transform point of elements. | CoverflowLayout
|  | fieldOfView : Number fieldOfView | PerspectiveAnimationNavigatorLayoutBase
|  | firstIndexInView : int [read-only] firstIndexInView | NavigatorLayoutBase
|  | focalLength : Number focalLength | PerspectiveAnimationNavigatorLayoutBase
|  | horizontalAlign : String The horizontal position of the selected element in the viewport. | CoverflowLayout
|  | horizontalAlignOffset : Number The offset in pixels to be used in conjunction with horizontalAlign to set the horizontal position of the selected element in the viewport. | CoverflowLayout
|  | horizontalAlignOffsetPercent : Number The offset as a percentage of the unscaled width of the viewport to be used in conjunction with horizontalAlign to set the horizontal position of the selected element in the viewport. | CoverflowLayout
|  | horizontalDisplacement : Number horizontalDisplacement | CoverflowLayout
|  | horizontalScrollPosition : Number The x coordinate of the origin of the viewport in the component's coordinate system, where the default value is (0,0) corresponding to the upper-left corner of the component. | LayoutBase
|  | indicesInLayout : Vector.<int> [read-only] A convenience method for determining the elements included in the layout. | NavigatorLayoutBase
|  | indicesNotInLayout : Vector.<int> [read-only] A convenience method for determining the elements excluded from the layout. | NavigatorLayoutBase
|  | lastIndexInView : int [read-only] lastIndexInView | NavigatorLayoutBase
|  | maximumZ : Number maximumZ | CoverflowLayout
|  | numElementsInLayout : int [read-only] Returns an int specifying number of elements included in the layout. | NavigatorLayoutBase
|  | numElementsNotInLayout : int [read-only] Returns an int specifying number of elements not included in the layout. | NavigatorLayoutBase
|  | numIndicesInView : int [read-only] inheritDoc | NavigatorLayoutBase
|  | numUnselectedElements : int The number of items to show either side of the selected item are positioned around this element. | CoverflowLayout
|  | projectionCenterX : Number projectionCenterX | PerspectiveAnimationNavigatorLayoutBase
|  | projectionCenterY : Number projectionCenterY | PerspectiveAnimationNavigatorLayoutBase
|  | renderingData : Boolean [read-only] inheritDoc | NavigatorLayoutBase
|  | rotationX : Number Whether rotation should be applied to the x axis of elements. | CoverflowLayout
|  | rotationY : Number Whether rotation should be applied to the y axis of elements. | CoverflowLayout
|  | scrollBarDirection : String The direction of the ScrollBar to use for navigation. | NavigatorLayoutBase
|  | selectedElement : IVisualElement [read-only] | NavigatorLayoutBase
|  | selectedHorizontalDisplacement : Number selectedHorizontalDisplacement | CoverflowLayout
|  | selectedIndex : int The index of the selected INavigatorLayout item. | NavigatorLayoutBase
|  | selectedVerticalDisplacement : Number selectedVerticalDisplacement | CoverflowLayout
|  | sizeChangedInLayoutPass : Boolean [read-only] | NavigatorLayoutBase
|  | target : GroupBase [override] The GroupBase container whose elements are measured, sized and positioned by this layout. | PerspectiveAnimationNavigatorLayoutBase
|  | typicalLayoutElement : ILayoutElement Used by layouts when fixed row/column sizes are requested but a specific size isn't specified. | LayoutBase
|  | unscaledHeight : Number [read-only] A convenience method for determining the unscaled height of the viewport. | NavigatorLayoutBase
|  | unscaledWidth : Number [read-only] A convenience method for determining the unscaled width of the viewport. | NavigatorLayoutBase
|  | useScrollBarForNavigation : Boolean useScrollBarForNavigation | NavigatorLayoutBase
|  | useVirtualLayout : Boolean A container can hold any number of children. | LayoutBase
|  | verticalAlign : String The vertical position of the selected element in the viewport. | CoverflowLayout
|  | verticalAlignOffset : Number The offset in pixels to be used in conjunction with verticalAlign to set the vertical position of the selected element in the viewport. | CoverflowLayout
|  | verticalAlignOffsetPercent : Number The offset as a percentage of the unscaled height of the viewport to be used in conjunction with verticalAlign to set the vertical position of the selected element in the viewport. | CoverflowLayout
|  | verticalDisplacement : Number verticalDisplacement | CoverflowLayout
|  | verticalScrollPosition : Number The y coordinate of the origin of the viewport in the component's coordinate system, where the default value is (0,0) corresponding to the upper-left corner of the component. | LayoutBase

Protected Properties
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| Property | Defined By
--- | --- | ---
|  | _elements : Vector.<IVisualElement> | NavigatorLayoutBase

Public Methods
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| Method | Defined By
--- | --- | ---
|  | CoverflowLayout() Constructor. | CoverflowLayout
|  | addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void | OnDemandEventDispatcher
|  | calculateDropLocation(dragEvent:DragEvent):DropLocation Calculates the drop location in the data provider of the drop target for the specified dragEvent. | LayoutBase
|  | clearVirtualLayoutCache():void When useVirtualLayout is true, this method can be used by the layout target to clear cached layout information when the target changes. | LayoutBase
|  | dispatchEvent(event:Event):Boolean | OnDemandEventDispatcher
|  | elementAdded(index:int):void Called by the target after a layout element has been added and before the target's size and display list are validated. | LayoutBase
|  | elementRemoved(index:int):void This method must is called by the target after a layout element has been removed and before the target's size and display list are validated. | LayoutBase
|  | getElementBounds(index:int):Rectangle Returns the specified element's layout bounds as a Rectangle or null if the index is invalid, the corresponding element is null, includeInLayout=false, or if this layout's target property is null. | LayoutBase
|  | getHorizontalScrollPositionDelta(navigationUnit:uint):Number [override] | NavigatorLayoutBase
|  | getNavigationDestinationIndex(currentIndex:int, navigationUnit:uint, arrowKeysWrapFocus:Boolean):int Delegation method that determines which item to navigate to based on the current item in focus and user input in terms of NavigationUnit. | LayoutBase
|  | getProjectionRectAtZ(z:Number):Rectangle Returns the visible projection plane at a specific depth. | PerspectiveAnimationNavigatorLayoutBase
|  | getScrollPositionDeltaToElement(index:int):Point Computes the verticalScrollPosition and horizontalScrollPosition deltas needed to scroll the element at the specified index into view. | LayoutBase
|  | getVerticalScrollPositionDelta(navigationUnit:uint):Number [override] | NavigatorLayoutBase
|  | hasEventListener(type:String):Boolean | OnDemandEventDispatcher
|  | hideDropIndicator():void Hides the previously shown drop indicator, created by the showDropIndicator() method, removes it from the display list and also stops the drag scrolling. | LayoutBase
|  | invalidateTargetSize():void | NavigatorLayoutBase
|  | isAnimating():Boolean Returns whether the layout is currently animating. | AnimationNavigatorLayoutBase
|  | measure():void [override] | NavigatorLayoutBase
|  | removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void | OnDemandEventDispatcher
|  | showDropIndicator(dropLocation:DropLocation):void Sizes, positions and parents the drop indicator based on the specified drop location. | LayoutBase
|  | updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void [override] Sizes and positions the target's elements. | NavigatorLayoutBase
|  | updateScrollRect(w:Number, h:Number):void [override] | NavigatorLayoutBase
|  | willTrigger(type:String):Boolean | OnDemandEventDispatcher

Protected Methods
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| Method | Defined By
--- | --- | ---
|  | applyColorTransformToElement(element:IVisualElement, colorTransform:ColorTransform):void | NavigatorLayoutBase
|  | calculateDragScrollDelta(dropLocation:DropLocation, elapsedTime:Number):Point Calculates how much to scroll for the specified dropLocation during a drag and drop gesture. | LayoutBase
|  | calculateDropIndex(x:Number, y:Number):int Returns the index where a new item should be inserted if the user releases the mouse at the specified coordinates while completing a drag and drop gesture. | LayoutBase
|  | calculateDropIndicatorBounds(dropLocation:DropLocation):Rectangle Calculates the bounds for the drop indicator that provides visual feedback to the user of where the items will be inserted at the end of a drag and drop gesture. | LayoutBase
|  | getElementBoundsAboveScrollRect(scrollRect:Rectangle):Rectangle Returns the bounds of the first layout element that either spans or is above the scrollRect's top edge. | LayoutBase
|  | getElementBoundsBelowScrollRect(scrollRect:Rectangle):Rectangle Returns the bounds of the first layout element that either spans or is below the scrollRect's bottom edge. | LayoutBase
|  | getElementBoundsLeftOfScrollRect(scrollRect:Rectangle):Rectangle Returns the bounds of the first layout element that either spans or is to the left of the scrollRect's left edge. | LayoutBase
|  | getElementBoundsRightOfScrollRect(scrollRect:Rectangle):Rectangle Returns the bounds of the first layout element that either spans or is to the right of the scrollRect's right edge. | LayoutBase
|  | getElementLayoutBoundsHeight(element:IVisualElement, postLayoutTransform:Boolean = true):Number | NavigatorLayoutBase
|  | getElementLayoutBoundsWidth(element:IVisualElement, postLayoutTransform:Boolean = true):Number | NavigatorLayoutBase
|  | getScroller():Scroller Returns a reference to the views Scroller if there is one. | NavigatorLayoutBase
|  | getScrollRect():Rectangle Returns the bounds of the target's scroll rectangle in layout coordinates. | LayoutBase
|  | indicesInView(firstIndexinView:int, numIndicesInView:int):void | NavigatorLayoutBase
|  | invalidateSelectedIndex(index:int, offset:Number):void [override] | AnimationNavigatorLayoutBase
|  | invalidateTargetDisplayList():void | NavigatorLayoutBase
|  | restoreElement(element:IVisualElement):void [override] Restores the element to reset any changes to is visible properties. | CoverflowLayout
|  | scrollPositionChanged():void [override] | NavigatorLayoutBase
|  | setElementLayoutBoundsSize(element:IVisualElement, postLayoutTransform:Boolean = true):void | NavigatorLayoutBase
|  | updateDisplayListBetween():void [override] | PerspectiveAnimationNavigatorLayoutBase
|  | updateElements():void | NavigatorLayoutBase
|  | updateElementsInLayout():void | NavigatorLayoutBase
|  | updateIndicesInView():void To be overridden in subclasses. | AnimationNavigatorLayoutBase
|  | updateScrollBar(index:int, offset:Number):void | NavigatorLayoutBase
|  | updateScrollerForContent():void | NavigatorLayoutBase
|  | updateScrollerForNavigation():void | NavigatorLayoutBase

Events
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| Event | Summary | Defined By
--- | --- | --- | ---
|  | change | The IndexChangeEvent.CHANGE constant defines the value of the type property of the event object for a change event, which indicates that an index has changed, such as when a List-based control changes its selection. | NavigatorLayoutBase
|  | valueCommit | The FlexEvent.VALUE_COMMIT constant defines the value of the type property of the event object for a valueCommit event. | NavigatorLayoutBase

Protected Constants
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| Constant | Defined By
--- | --- | ---
|  | DIRECT : String = direct [static] An animationType value passed to the constructor. | AnimationNavigatorLayoutBase
|  | INDIRECT : String = indirect [static] An animationType value passed to the constructor. | AnimationNavigatorLayoutBase

Property Detail

depthColor | property

`depthColor:int`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The color tint to apply to elements as their are moved back on the z axis.

If a valid color is added to elements are tinted as they are moved back on the z axis taking into account the `depthColorAlpha` specified. If a value of -1 is set for the color no tinting is applied.

The default value is `-1`.

Implementation
`public function get depthColor():int`
`public function set depthColor(value:int):void`

See also

depthColorAlpha

depthColorAlpha | property |

`depthColorAlpha:Number`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The alpha to be used for the color tint that is applied to elements as their are moved back on the z axis.

The default value is `1`.

Implementation
`public function get depthColorAlpha():Number`
`public function set depthColorAlpha(value:Number):void`

See also

depthColor

elementHorizontalAlign | property |

`elementHorizontalAlign:String`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The horizontal transform point of elements.

Valid values are `HorizontalAlign.LEFT`, `HorizontalAlign.CENTER` and `HorizontalAlign.RIGHT`.

The default value is `"center"`.

Implementation
`public function get elementHorizontalAlign():String`
`public function set elementHorizontalAlign(value:String):void`

See also

spark.layouts.HorizontalAlign

elementVerticalAlign | property |

`elementVerticalAlign:String`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The vertical transform point of elements.

Valid values are `VerticalAlign.TOP`, `VerticalAlign.MIDDLE` and `VerticalAlign.BOTTOM`.

The default value is `"middle"`.

Implementation
`public function get elementVerticalAlign():String`
`public function set elementVerticalAlign(value:String):void`

See also

spark.layouts.VerticalAlign

horizontalAlign | property |

`horizontalAlign:String`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The horizontal position of the selected element in the viewport. All other elements are positioned around this element.

Valid values are `HorizontalAlign.LEFT`, `HorizontalAlign.CENTER` and `HorizontalAlign.RIGHT`.

The default value is `"center"`.

Implementation
`public function get horizontalAlign():String`
`public function set horizontalAlign(value:String):void`

See also

horizontalAlignOffset
horizontalAlignOffsetPercent
spark.layouts.HorizontalAlign

horizontalAlignOffset | property |

`horizontalAlignOffset:Number`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The offset in pixels to be used in conjunction with `horizontalAlign` to set the horizontal position of the selected element in the viewport. All other elements are positioned around this element.

If `horizontalAlignOffsetPercent` is set after this property, this property is set automatically depending on the value of `horizontalAlignOffsetPercent`.

The default value is `0`.

Implementation
`public function get horizontalAlignOffset():Number`
`public function set horizontalAlignOffset(value:Number):void`

See also

horizontalAlign
horizontalAlignOffsetPercent
spark.layouts.HorizontalAlign

horizontalAlignOffsetPercent | property |

`horizontalAlignOffsetPercent:Number`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The offset as a percentage of the unscaled width of the viewport to be used in conjunction with `horizontalAlign` to set the horizontal position of the selected element in the viewport. All other elements are positioned around this element.

Setting this property overrides any value set on `horizontalAlignOffset`.

The default value is `0`.

Implementation
`public function get horizontalAlignOffsetPercent():Number`
`public function set horizontalAlignOffsetPercent(value:Number):void`

See also

horizontalAlign
horizontalAlignOffset
spark.layouts.HorizontalAlign

horizontalDisplacement | property |

`horizontalDisplacement:Number`

Language Version : | ActionScript

Product Version : | Flex 4

Runtime Versions : | Flash Player 10 - , AIR 1.5 -

horizontalDisplacement

Implementation
`public function get horizontalDisplacement():Number`
`public function set horizontalDisplacement(value:Number):void`

maximumZ | property |

`maximumZ:Number`

Language Version : | ActionScript

Product Version : | Flex 4

Runtime Versions : | Flash Player 10 - , AIR 1.5 -

maximumZ

Implementation
`public function get maximumZ():Number`
`public function set maximumZ(value:Number):void`

numUnselectedElements | property |

`numUnselectedElements:int`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The number of items to show either side of the selected item are positioned around this element.

Valid values are `HorizontalAlign.LEFT`, `HorizontalAlign.CENTER` and `HorizontalAlign.RIGHT`.

The default value is `2`.

Implementation
`public function get numUnselectedElements():int`
`public function set numUnselectedElements(value:int):void`

rotationX | property |

`rotationX:Number`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Whether rotation should be applied to the x axis of elements.

The default value is `true`.

Implementation
`public function get rotationX():Number`
`public function set rotationX(value:Number):void`

rotationY | property |

`rotationY:Number`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Whether rotation should be applied to the y axis of elements.

The default value is `true`.

Implementation
`public function get rotationY():Number`
`public function set rotationY(value:Number):void`

selectedHorizontalDisplacement | property |

`selectedHorizontalDisplacement:Number`

Language Version : | ActionScript

Product Version : | Flex 4

Runtime Versions : | Flash Player 10 - , AIR 1.5 -

selectedHorizontalDisplacement

Implementation
`public function get selectedHorizontalDisplacement():Number`
`public function set selectedHorizontalDisplacement(value:Number):void`

selectedVerticalDisplacement | property |

`selectedVerticalDisplacement:Number`

Language Version : | ActionScript

Product Version : | Flex 4

Runtime Versions : | Flash Player 10 - , AIR 1.5 -

selectedVerticalDisplacement

Implementation
`public function get selectedVerticalDisplacement():Number`
`public function set selectedVerticalDisplacement(value:Number):void`

verticalAlign | property |

`verticalAlign:String`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The vertical position of the selected element in the viewport. All other elements are positioned around this element.

Valid values are `VerticalAlign.TOP`, `VerticalAlign.MIDDLE` and `VerticalAlign.BOTTOM`.

The default value is `"middle"`.

Implementation
`public function get verticalAlign():String`
`public function set verticalAlign(value:String):void`

See also

verticalAlignOffset
verticalAlignOffsetPercent
spark.layouts.VerticalAlign

verticalAlignOffset | property |

`verticalAlignOffset:Number`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The offset in pixels to be used in conjunction with `verticalAlign` to set the vertical position of the selected element in the viewport. All other elements are positioned around this element.

If `verticalAlignOffsetPercent` is set after this property, this property is set automatically depending on the value of `verticalAlignOffsetPercent`.

The default value is `0`.

Implementation
`public function get verticalAlignOffset():Number`
`public function set verticalAlignOffset(value:Number):void`

See also

verticalAlign
verticalAlignOffsetPercent
spark.layouts.VerticalAlign

verticalAlignOffsetPercent | property |

`verticalAlignOffsetPercent:Number`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

The offset as a percentage of the unscaled height of the viewport to be used in conjunction with `verticalAlign` to set the vertical position of the selected element in the viewport. All other elements are positioned around this element.

Setting this property overrides any value set on `verticalAlignOffset`.

The default value is `0`.

Implementation
`public function get verticalAlignOffsetPercent():Number`
`public function set verticalAlignOffsetPercent(value:Number):void`

See also

verticalAlign
verticalAlignOffset
spark.layouts.VerticalAlign

verticalDisplacement | property |

`verticalDisplacement:Number`

Language Version : | ActionScript

Product Version : | Flex 4

Runtime Versions : | Flash Player 10 - , AIR 1.5 -

verticalDisplacement

Implementation
`public function get verticalDisplacement():Number`
`public function set verticalDisplacement(value:Number):void`
Constructor Detail

CoverflowLayout | () | Constructor

`public function CoverflowLayout()`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Constructor.

Method Detail

restoreElement | () | method

`override protected function restoreElement(element:IVisualElement):void`

Language Version : | ActionScript 3.0

Product Version : | Flex 4

Runtime Versions : | Flash Player 10, AIR 1.5

Restores the element to reset any changes to is visible properties. This method should be overridden in a subclass to return any elements used in the layout to its default state when it is removed from the targets displayList or when the target is removed from the layout.

Parameters

| `element:IVisualElement` — The element to be restored.

Sun Mar 5 2017, 03:42 PM +11:00