Flex 学习之中之二十一 itemRenderer的用法

下面实现的是可以隔行显示和当鼠标移上去时，可以动态显示文字

<?xml version="1.0" encoding="utf-8"?>
<!-- containers\spark\SparkDataGroupContainerAlternatingIR.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
			   xmlns:mx="library://ns.adobe.com/flex/mx"
			   xmlns:s="library://ns.adobe.com/flex/spark">
	<s:SkinnableDataContainer
		itemRenderer="containers.spark.myComponents.MyAlternatingItemRenderer">
		<s:layout>
			<s:VerticalLayout/>
		</s:layout>
		<mx:ArrayList>
			<fx:String>Bill Smith</fx:String>
			<fx:String>Dave Jones</fx:String>
			<fx:String>Mary Davis</fx:String>
			<fx:String>Debbie Cooper</fx:String>
		</mx:ArrayList>
	</s:SkinnableDataContainer>
</s:Application>

<?xml version="1.0" encoding="utf-8"?>
<!-- containers\spark\myComponents\MyAlternatingItemRenderer.mxml -->
<s:ItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
				xmlns:mx="library://ns.adobe.com/flex/mx"
				xmlns:s="library://ns.adobe.com/flex/spark"
				autoDrawBackground="false">
	<fx:Script>
		<![CDATA[
			// Make the default background color white.
			[Bindable]
			public var myBGColor:int = 0xFFFFFF;
			// Override the itemIndex set function to draw a
			// white background behind even number items,
			// and a green background behind odd numbered items.
			override public function set itemIndex(value:int):void {
				if ((value%2) == 0) {
					myBGColor= 0xFFFFFF;
				}
				if ((value%2) == 1) {
					myBGColor= 0xCCFF66;
				}
			}
		]]>
	</fx:Script>
	<s:states>
		<s:State name="normal"/>
		<s:State name="hovered"/>
	</s:states>
	<s:Rect id="myRect"
			left="0" right="0" top="0" bottom="0"
			alpha="1.0">
		<s:stroke>
			<s:SolidColorStroke
				color="0xA8C6EE"
				weight="1"/>
		</s:stroke>
		<s:fill>
			<!-- Bind the myBGColor property to the fill color. -->
			<s:SolidColor
				color="{myBGColor}"/>
		</s:fill>
	</s:Rect>
	<s:Label id="labelDisplay"
			 verticalCenter="0"
			 left="3" right="3" top="6" bottom="4"
			 fontSize.hovered='14' fontStyle.hovered="italic"/>
</s:ItemRenderer>