Flex TextArea 滚动到底部

最核心的两句话：

??? ??? ??? ??? ??? textContainer.scroller.viewport.verticalScrollPosition=textContainer.scroller.viewport.contentHeight;
textContainer.validateNow();

?

?

<?xml version="1.0" encoding="utf-8"?>
<s:TitleWindow xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx" width="400" height="300">
	<s:layout>
		<s:BasicLayout/>
	</s:layout>

	<fx:Script>
		<![CDATA[
			protected function button1_clickHandler(event:MouseEvent):void
			{
				var interval:uint=100;
				var repeat:uint=60;
				var myTimer:Timer=new Timer(interval,repeat);
				myTimer.addEventListener(TimerEvent.TIMER,timerHandler);
				myTimer.start();
				function timerHandler(event:TimerEvent):void
				{
					textContainer.text+="abcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcdabcd";
					textContainer.scroller.viewport.verticalScrollPosition=textContainer.scroller.viewport.contentHeight;
					textContainer.validateNow();
				}
			}
		]]>
	</fx:Script>

	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
	</fx:Declarations>
	<s:TextArea x="10" y="10" id="textContainer"/>
	<s:Button x="10" y="169" label="开始滚动" click="button1_clickHandler(event)"/>
</s:TitleWindow>