flex移动文字

drageffect.mxml

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
 <![CDATA[
  import mx.graphics.ImageSnapshot;
  import mx.controls.Image;
  import mx.core.UIComponent;
 
  public var uiComponent:Object;
  public var targetImage:Image;
  public var Ax:int = 0;
  public var Ay:int = 0;
  public function mouseDown(event:MouseEvent):void{
   //在原地生成图片副本，然后将移动图片。
   this.uiComponent = event.currentTarget;
   //生成图片
    var bd:BitmapData = ImageSnapshot.captureBitmapData( UIComponent( uiComponent ) );
       targetImage = new Image();
       targetImage.source = new Bitmap(bd);
       targetImage.x = uiComponent.x;
       targetImage.y = uiComponent.y;
       Ax = event.localX;
       Ay = event.localY;
       this.addEventListener(MouseEvent.MOUSE_MOVE, mouseMove);
       this.addEventListener(MouseEvent.MOUSE_UP, mouseUp);
       this.addChild(targetImage);
  }
  
  public function mouseMove(event:MouseEvent):void{
   targetImage.x = event.stageX-Ax;
   targetImage.y = event.stageY-Ay;
  }
  
  public function mouseUp(event:MouseEvent):void{
   this.removeEventListener(MouseEvent.MOUSE_MOVE, mouseMove);
      this.removeEventListener(MouseEvent.MOUSE_UP, mouseUp);
      
   //当鼠标移动到预定位置，将图片删除，并且移动源控件。
   uiComponent.x = event.stageX-Ax;
   uiComponent.y = event.stageY-Ay;
   this.removeChild(targetImage);
   targetImage = null;
   
  }
  
  
 ]]>
</mx:Script>
 <mx:Label mouseDown="mouseDown(event)" x="48" y="29" width="278" height="149" text="asdasdasdasd "/>
</mx:Application>