flex实现窗口关闭时放大和缩小的效果 Zoom

zoom类：

<?xml version="1.0" encoding="utf-8"?>
<mx:TitleWindow xmlns:mx="http://www.adobe.com/2006/mxml"
				width="416" showCloseButton="true" creationComplete="onCreate()"
				height="304" close="on_win_close()">
	<mx:Script>
		<![CDATA[
			import mx.managers.PopUpManager;
			import mx.events.EffectEvent;
			import mx.rpc.events.ResultEvent;

			[Bindable]
			private var timer:Timer;

			private function onCreate():void
			{
				this.alpha = 0.1;
				timer = new Timer(10);
				timer.addEventListener(TimerEvent.TIMER,on_create_timer_start);
				timer.start();
				create_zoom_smal.play();
				create_zoom_smal.addEventListener(EffectEvent.EFFECT_END,on_create_zoom_smal_end);
			}

			private function on_create_zoom_smal_end(event:EffectEvent):void
			{
				create_zoom_smal.removeEventListener(EffectEvent.EFFECT_END,on_create_zoom_smal_end);
				create_zoom_big.play();
				this.alpha = 1.0;
				timer.stop();
			}


			//创建时timer启动监听		 		
			private function on_create_timer_start(event:TimerEvent):void
			{
				if(this.alpha<1)
				{
					this.alpha +=0.1;
				}
				else
				{
					timer.stop();
				}
			}

			//处理窗口关闭事件
			private function on_win_close():void
			{
				timer = new Timer(40);
				timer.addEventListener(TimerEvent.TIMER,on_close_timer_start);
				timer.start();
				close_zoom_big.play();
				close_zoom_big.addEventListener(EffectEvent.EFFECT_END,close_zoom_big_end);
			}

			private function close_zoom_big_end(event:EffectEvent):void
			{
				close_zoom_big.removeEventListener(EffectEvent.EFFECT_END,close_zoom_big_end);
				close_zoom_small.play();
				if(this.alpha<=0) {
				PopUpManager.removePopUp(this);
				timer.stop();
				}
			}

			private function on_close_timer_start(event:TimerEvent):void
			{
				this.alpha -=0.1;
			}

		]]>
	</mx:Script>

	<!-- 关闭效果-->
	<!-- 关闭缩小-->
	<mx:Zoom id="close_zoom_small" zoomHeightTo="0.98" target="{this}"
			 zoomWidthTo="0.98"
			 duration="75"/>
	<!-- 关闭放大 -->
	<mx:Zoom id="close_zoom_big" zoomHeightTo="1.1" target="{this}"
			 zoomWidthTo="1.1"
			 duration="250"/>

	<!-- 创建效果 -->
	<!-- 创建放大 -->
	<mx:Zoom id="create_zoom_smal" zoomHeightTo="1" target="{this}"
			 zoomWidthTo="1"
			 duration="100"/>
	<!-- 创建缩小 -->
	<mx:Zoom id="create_zoom_big" zoomHeightFrom="0.9" zoomHeightTo="1" target="{this}"
			 zoomWidthFrom="0.9" zoomWidthTo="1"
			 duration="230"/>
</mx:TitleWindow>

测试类：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
	<mx:Script>
		<![CDATA[
			import mx.managers.PopUpManager;
			private function init():void {
				var tz:testZoom1 = new testZoom1();
				PopUpManager.addPopUp(tz,this);
			}
		]]>
	</mx:Script>	
	<mx:Button label="弹出" click="init()"/>
</mx:Application>