学步园

简单的例子

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="427" height="374" backgroundGradientColors="[#ffffff, #ffffff]">
<mx:Script>
    <![CDATA[
        import mx.events.MoveEvent;
        private var oldX,oldY:Number;
        private  function onMouseMove(event:MouseEvent):void{
            lbl.text = "Local (x,y):" + event.localX.toString() + ","+event.localX.toString();
            lbl2.text = "Stage (x,y):" + event.stageX.toString() + ","+event.stageY.toString();
            if(event.buttonDown){
                var x:Number = event.stageX - oldX;
                var y:Number = event.stageY - oldY;
                oldX = event.stageX;
                oldY = event.stageY;                
                img.move(img.x + x,img.y + y);        
            }
        }
        
        private  function onMouseDown(event:MouseEvent):void{
            oldX = event.stageX;
            oldY = event.stageY;
        }
    ]]>
</mx:Script>
    <mx:Label x="10" y="10" text="" id="lbl"/>
    <mx:Label x="10" y="27" text="" id="lbl2"/>
    <mx:Image id="img" x="147" y="156" source="http://www.cnblogs.com/Images/adminlogo.gif" mouseMove="onMouseMove(event)" mouseDown="onMouseDown(event)"/>
    
</mx:Application>

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总结
1.关键处为"怎样一个状态是拖动状态",不用想太多,很简单,mouseMove时判断buttonDown就行了