Flex中如何通过verticalScrollPosition和maxVerticalScrollPosition属性，TextArea增加新内容的时候自动滚动...

main.mxml

1. <?xml version="1.0" encoding="utf-8"?>
2. <mx:Applicationname="TextArea_maxVerticalScrollPosition_text"
3. xmlns:mx="http://www.adobe.com/2006/mxml"
4. layout="vertical"
5. verticalAlign="middle"
6. backgroundColor="white"
7. creationComplete="init();">
9. <mx:Script>
10. <![CDATA[
11. private var timer:Timer;
13. private function init():void {
14. timer = new Timer(500);
15. timer.addEventListener(TimerEvent.TIMER, onTimer);
16. timer.start();
17. }
19. private function onTimer(evt:TimerEvent):void {
20. var now:String = new Date().toTimeString();
21. var str:String = "[" + timer.currentCount + "] " + now;
22. textArea.text += str + "\n";
23. textArea.validateNow();
24. textArea.verticalScrollPosition = textArea.maxVerticalScrollPosition;
25. }
26. ]]>
27. </mx:Script>
29. <mx:TextAreaid="textArea"
30. width="200"
31. height="160"/>
33. </mx:Application>