代码语言：javascript复制
public class UndoTextArea extends TextArea
{
private var _undoManager:UndoManager;
public function UndoTextArea()
{
super();
_undoManager=new UndoManager();
this.addEventListener(KeyboardEvent.KEY_UP,undoKeyUpHandler);
this.addEventListener(FlexEvent.CREATION_COMPLETE,creationCompleteHandler);
}
private function creationCompleteHandler(evt:FlexEvent):void
{
this.textFlow.interactionManager=new EditManager(this._undoManager);
}
private function undoKeyUpHandler(evt:KeyboardEvent):void
{
if (evt.ctrlKey&&evt.keyCode == 90)
{
_undoManager.undo();
}
}
}这里使用了KEY_UP事件，其实更合理的是用KEY_DOWN，只是在IE下CTRL-Z被浏览器截获了，我们的程序捕获不到！
