10.1.使用DragManager 类

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="horizontal">
<mx:Script>
<![CDATA[
import mx.core.DragSource;
import mx.core.IUIComponent;
import mx.events.DragEvent;
import mx.managers.DragManager;
private static const FORMAT:String = "box";
private function mouseDownHandler(evt:MouseEvent ):void{
var initiator:IUIComponent = evt.currentTarget as IUIComponent;
var dragSource:DragSource = new DragSource();
dragSource.addData( initiator, FORMAT );
DragManager.doDrag( initiator, dragSource, evt );
}
private function dragEnterHandler( evt:DragEvent ):void {
if ( evt.dragSource.hasFormat( FORMAT ) ) {
DragManager.acceptDragDrop(Canvas(evt.currentTarget));
}
}
private function dropHandler( evt:DragEvent ):void {
var box:Box = Box( evt.dragInitiator );
box.x = evt.localX;
box.y = evt.localY;
}

]]>
</mx:Script>
<mx:Canvas id="canvas" backgroundColor="0xEEEEEE" width="300" height="300"
dragEnter="dragEnterHandler(event);" dragDrop="dropHandler(event);">
<mx:Box id="dragItem" width="20" height="20" backgroundColor="0x00FFCC" mouseDown="mouseDownHandler(event);" />
</mx:Canvas>
</mx:Application>