Adobe® Flex® 4 Language Reference
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spark.components 
IItemRenderer 
Packagespark.components
Interfacepublic interface IItemRenderer extends IDataRenderer , IVisualElement , ILayoutElement , ILayoutDirectionElement , IEventDispatcher
Implementors ButtonBarButton, DefaultItemRenderer, ItemRenderer

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

The IItemRenderer interface defines the basic set of APIs that a class must implement to create an item renderer that can communicate with a host component. The host component, such as the List or ButtonBar controls, must implement the IItemRendererOwner interface.

See also



Public Properties
 PropertyDefined By
 Inheritedalpha : Number
Indicates the alpha transparency value of the object specified.
IVisualElement
 Inheritedbaseline : Object
The vertical distance in pixels from the anchor target to the control's baseline position.
ILayoutElement
 InheritedbaselinePosition : Number
[read-only] The y-coordinate of the baseline of the first line of text of the component.
ILayoutElement
 Inheritedbottom : Object
The vertical distance in pixels from the bottom edge of the component to the anchor target's bottom edge.
ILayoutElement
 Inheriteddata : Object
The data to render or edit.
IDataRenderer
 Inheriteddepth : Number
Determines the order in which items inside of containers are rendered.
IVisualElement
 InheriteddesignLayer : DesignLayer
Specifies the optional DesignLayer instance associated with this visual element.
IVisualElement
  dragging : Boolean
Contains true if the item renderer is being dragged.
IItemRenderer
 InheritedhasLayoutMatrix3D : Boolean
[read-only] Contians true if the element has 3D Matrix.
ILayoutElement
 Inheritedheight : Number
Indicates the height of the display object, in pixels.
IVisualElement
 InheritedhorizontalCenter : Object
The horizontal distance in pixels from the center of the component to the center of the anchor target's content area.
ILayoutElement
 InheritedincludeInLayout : Boolean
Specifies whether this component is included in the layout of the parent container.
ILayoutElement
 Inheritedis3D : Boolean
[read-only] Contains true when the element is in 3D.
IVisualElement
  itemIndex : int
The index of the item in the data provider of the host component of the item renderer.
IItemRenderer
  label : String
The String to display in the item renderer.
IItemRenderer
 InheritedlayoutDirection : String
Specifies the desired layout direction for an element: one of LayoutDirection.LTR (left to right), LayoutDirection.RTL (right to left), or null (inherit).
ILayoutDirectionElement
 Inheritedleft : Object
The horizontal distance in pixels from the left edge of the component to the anchor target's left edge.
ILayoutElement
 Inheritedowner : DisplayObjectContainer
The owner of this IVisualElement object.
IVisualElement
 Inheritedparent : DisplayObjectContainer
[read-only] The parent container or component for this component.
IVisualElement
 InheritedpercentHeight : Number
Number that specifies the height of a component as a percentage of its parent's size.
ILayoutElement
 InheritedpercentWidth : Number
Number that specifies the width of a component as a percentage of its parent's size.
ILayoutElement
 InheritedpostLayoutTransformOffsets : mx.geom:TransformOffsets
Defines a set of adjustments that can be applied to the object's transform in a way that is invisible to its parent's layout.
IVisualElement
 Inheritedright : Object
The horizontal distance in pixels from the right edge of the component to the anchor target's right edge.
ILayoutElement
  selected : Boolean
Contains true if the item renderer can show itself as selected.
IItemRenderer
  showsCaret : Boolean
Contains true if the item renderer can show itself as focused.
IItemRenderer
 Inheritedtop : Object
The vertical distance in pixels from the top edge of the component to the anchor target's top edge.
ILayoutElement
 InheritedverticalCenter : Object
The vertical distance in pixels from the center of the component to the center of the anchor target's content area.
ILayoutElement
 Inheritedvisible : Boolean
Controls the visibility of this visual element.
IVisualElement
 Inheritedwidth : Number
Indicates the width of the display object, in pixels.
IVisualElement
 Inheritedx : Number
Indicates the x coordinate of the DisplayObject instance relative to the local coordinates of the parent DisplayObjectContainer.
IVisualElement
 Inheritedy : Number
Indicates the y coordinate of the DisplayObject instance relative to the local coordinates of the parent DisplayObjectContainer.
IVisualElement
Public Methods
 MethodDefined By
 Inherited
addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
Registers an event listener object with an EventDispatcher object so that the listener receives notification of an event.
IEventDispatcher
 Inherited
Dispatches an event into the event flow.
IEventDispatcher
 Inherited
getBoundsXAtSize(width:Number, height:Number, postLayoutTransform:Boolean = true):Number
Returns the x coordinate of the element's bounds at the specified element size.
ILayoutElement
 Inherited
getBoundsYAtSize(width:Number, height:Number, postLayoutTransform:Boolean = true):Number
Returns the y coordinate of the element's bounds at the specified element size.
ILayoutElement
 Inherited
getLayoutBoundsHeight(postLayoutTransform:Boolean = true):Number
Returns the element's layout height.
ILayoutElement
 Inherited
getLayoutBoundsWidth(postLayoutTransform:Boolean = true):Number
Returns the element's layout width.
ILayoutElement
 Inherited
getLayoutBoundsX(postLayoutTransform:Boolean = true):Number
Returns the x coordinate that the element uses to draw on screen.
ILayoutElement
 Inherited
getLayoutBoundsY(postLayoutTransform:Boolean = true):Number
Returns the y coordinate that the element uses to draw on screen.
ILayoutElement
 Inherited
Returns the transform matrix that is used to calculate the component's layout relative to its siblings.
ILayoutElement
 Inherited
Returns the layout transform Matrix3D for this element.
ILayoutElement
 Inherited
getMaxBoundsHeight(postLayoutTransform:Boolean = true):Number
Returns the element's maximum height.
ILayoutElement
 Inherited
getMaxBoundsWidth(postLayoutTransform:Boolean = true):Number
Returns the element's maximum width.
ILayoutElement
 Inherited
getMinBoundsHeight(postLayoutTransform:Boolean = true):Number
Returns the element's minimum height.
ILayoutElement
 Inherited
getMinBoundsWidth(postLayoutTransform:Boolean = true):Number
Returns the element's minimum width.
ILayoutElement
 Inherited
getPreferredBoundsHeight(postLayoutTransform:Boolean = true):Number
Returns the element's preferred height.
ILayoutElement
 Inherited
getPreferredBoundsWidth(postLayoutTransform:Boolean = true):Number
Returns the element's preferred width.
ILayoutElement
 Inherited
Checks whether the EventDispatcher object has any listeners registered for a specific type of event.
IEventDispatcher
 Inherited
An element must call this method when its layoutDirection changes or when its parent's layoutDirection changes.
ILayoutDirectionElement
 Inherited
removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void
Removes a listener from the EventDispatcher object.
IEventDispatcher
 Inherited
setLayoutBoundsPosition(x:Number, y:Number, postLayoutTransform:Boolean = true):void
Sets the coordinates that the element uses to draw on screen.
ILayoutElement
 Inherited
setLayoutBoundsSize(width:Number, height:Number, postLayoutTransform:Boolean = true):void
Sets the layout size of the element.
ILayoutElement
 Inherited
setLayoutMatrix(value:Matrix, invalidateLayout:Boolean):void
Sets the transform Matrix that is used to calculate the component's layout size and position relative to its siblings.
ILayoutElement
 Inherited
setLayoutMatrix3D(value:Matrix3D, invalidateLayout:Boolean):void
Sets the transform Matrix3D that is used to calculate the component's layout size and position relative to its siblings.
ILayoutElement
 Inherited
transformAround(transformCenter:Vector3D, scale:Vector3D = null, rotation:Vector3D = null, translation:Vector3D = null, postLayoutScale:Vector3D = null, postLayoutRotation:Vector3D = null, postLayoutTranslation:Vector3D = null, invalidateLayout:Boolean = true):void
A utility method to update the rotation, scale, and translation of the transform while keeping a particular point, specified in the component's own coordinate space, fixed in the parent's coordinate space.
ILayoutElement
 Inherited
Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type.
IEventDispatcher
Property Detail

dragging

property
dragging:Boolean

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

Contains true if the item renderer is being dragged.



Implementation
    public function get dragging():Boolean
    public function set dragging(value:Boolean):void

itemIndex

property 
itemIndex:int

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

The index of the item in the data provider of the host component of the item renderer.



Implementation
    public function get itemIndex():int
    public function set itemIndex(value:int):void

label

property 
label:String

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

The String to display in the item renderer.

The host component of the item renderer can use the itemToLabel() method to convert the data item to a String for display by the item renderer.

For controls like List and ButtonBar, you can use the labelField or labelFunction properties to specify the field of the data item that contains the String. Otherwise the host component uses the toString() method to convert the data item to a String.



Implementation
    public function get label():String
    public function set label(value:String):void

selected

property 
selected:Boolean

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

Contains true if the item renderer can show itself as selected.



Implementation
    public function get selected():Boolean
    public function set selected(value:Boolean):void

showsCaret

property 
showsCaret:Boolean

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

Contains true if the item renderer can show itself as focused.



Implementation
    public function get showsCaret():Boolean
    public function set showsCaret(value:Boolean):void