flex Resize使用

<?xml version="1.0"?>
<!-- controlsimageImageResize.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
	<mx:Script>
		<![CDATA[
			private var hideFlag:Boolean = true;
			private function resizeF():void {
				if(!hideFlag) {
					up.play();
				} else {
					down.play();
				}
				hideFlag=!hideFlag;
			}
		]]>
	</mx:Script>
	<mx:Resize id="resizeBig" 
			   widthFrom="20" widthTo="200" 
			   heightFrom="30" heightTo="300"
			   />
	<mx:Resize id="resizeSmall" 
			   widthFrom="200" widthTo="20" 
			   heightFrom="300" heightTo="30"
			   />

	<!--第二种方式-->
	<mx:Resize id="up"
			   duration="500"
			   target="{img1}"
			   heightTo="0">
	</mx:Resize>
	<mx:Resize id="down"
			   duration="500"
			   target="{img1}"
			   heightTo="23">
	</mx:Resize>
	<mx:HBox>
		<mx:Image width="22" height="27"
				  source="@Embed('assets/left1.png')" 
				  rollOverEffect="{resizeBig}" 
				  rollOutEffect="{resizeSmall}"/>

		<mx:Image  id="img1" source="@Embed('assets/left1.png')"/>
		<mx:Button click="resizeF()" label="Resize"/>
	</mx:HBox>

</mx:Application>