flex圖片拖拽

/**    
* 圖片拖拽    
*/    
public function dragHandler(event:MouseEvent):void{        
         //CurrentTarget指定要實現拖拽事件的初始化目標        
        var dragInitiator:Image=event.currentTarget as Image;        
        // 定義拖拽掛載數據源        
        var dragSource:DragSource = new DragSource();        
        //向對象添加數據        
        dragSource.addData(dragInitiator.source,"img");        
        //建立一個拖拽對象的代理做爲拷貝        
        var dragProxy:Image=new Image();        
        dragProxy.source=event.currentTarget.source;        
        //使用DragManager靜態方法doDrag開始拖拽        
        DragManager.doDrag(dragInitiator,dragSource,event,dragProxy);        
}        
private function dragEnterHandler(event:DragEvent):void{        
             var dropTarget:Image=event.currentTarget as Image;        
             DragManager.acceptDragDrop(dropTarget);        
            }        
private function dragDropHandler(event:DragEvent):void{        
        img_main.source=event.dragSource.dataForFormat("img");        
}    

<!-- 拖拽 -->    
         < s:Panel x ="10" y ="285" width ="250" height ="204" baseColor ="#EF5D5D" >    
                 < mx:Image x ="55" y ="13" width ="131" height ="132"        
                         id ="img_main" source ="p_w_picpath/mt.jpg"        
                         dragDrop ="dragDropHandler(event)" dragEnter ="dragEnterHandler(event)" />    
         </ s:Panel >    
         < s:Group x ="268" y ="289" width ="200" height ="200" >    
                 < mx:Image x ="28" y ="36" width ="60" height ="78" id ="img_1" source ="p_w_picpath/java.jpg"        
                         mouseMove ="dragHandler(event)" />    
                 < mx:Image x ="111" y ="39" width ="73" height ="75" id ="img_2" source ="p_w_picpath/mt.jpg"        
                         mouseMove ="dragHandler(event)" />    
         </ s:Group >