Flex 拖拽范例

Flex由于在其Framwork里加入了DragDrop管理器，可以使得开发者在Flex应用中实现类似桌面的效果，默认情况下，Flex的拖拽管理器是针对List等控件的，实现这类控件之间的Item拖拽非常容易。下面是一个很简单的小例子
<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="450" height="350" creationComplete="initApp()" backgroundColor="#FFFFFF" fontSize="12"> <mx:Script>  <![CDATA[    private function initApp():void{      words.dataProvider=['Water','水','Car','汽车','House','房屋','Book','书籍','Music','音乐','Sandwich','三明治'];      english.dataProvider=[];      chinese.dataProvider=[];    }  ]]></mx:Script>  <mx:Panel x="0" y="0" width="450" height="350" layout="absolute" title="Sort Words By Language">    <mx:Label x="7" y="3" text="Drag to Correct Language"/>    <mx:List x="7" y="25" id="words" width="200" height="275" allowMultipleSelection="true" dragEnabled="true"></mx:List>    <mx:Label x="223" y="6" text="English"/>    <mx:List x="223" y="25" id="english" width="200" height="120" dropEnabled="true"></mx:List>    <mx:Label x="223" y="150" text="中文"/>    <mx:List x="223" y="177" id="chinese" width="200" height="120" dropEnabled="true"></mx:List>  </mx:Panel></mx:Application>

<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" width="400" height="400" backgroundColor="#FFFFFF" creationComplete="initApp()" layout="absolute">  <mx:Script>    <![CDATA[      import mx.controls.DataGrid;      import mx.controls.Image;      import mx.collections.ArrayCollection;      import mx.events.DragEvent;      import mx.managers.DragManager;      import mx.core.DragSource;      [Bindable]      public var total:Number=0;      [Bindable]      public var cartContents:ArrayCollection;      private function initApp():void{        this.cartContents=new ArrayCollection();      }      private function dragIt(event:MouseEvent,name:String,price:Number):void{        //CurrentTarget指定要实现拖拽事件的初始化目标        var dragInitiator:Image=event.currentTarget as Image;        //指定一个dragSource来包括拖拽过程中包含的数据的对象        var dragSource:DragSource=new DragSource();        //向对象添加数据        dragSource.addData(name,'name');        dragSource.addData(price,'price');        //创建一个拖拽对象的代理作为拷贝        var dragProxy:Image=new Image();        dragProxy.source=event.currentTarget.source;        //使用DragManager静态方法doDrag开始拖拽        DragManager.doDrag(dragInitiator,dragSource,event,dragProxy);      }      private function dragEnterHandler(event:DragEvent):void{        var dropTarget:DataGrid=event.currentTarget as DataGrid;        if (event.dragSource.hasFormat('name') && event.dragSource.hasFormat('price')){          DragManager.acceptDragDrop(dropTarget);        }      }      private function dragDropHandler(event:DragEvent):void{        var name:String= String(event.dragSource.dataForFormat('name'));        var price:Number=Number(event.dragSource.dataForFormat('price'));        this.cartContents.addItem({name:String(event.dragSource.dataForFormat('name')),price:String(event.dragSource.dataForFormat('price'))});        total+=price;      }    ]]>  </mx:Script>  <mx:Canvas x="19" y="10">  <mx:Image x="23" y="35" width="64" height="64" mouseMove="dragIt(event,'Dreamweaver',499);" source="@Embed(source='../assets/056.png')"/>  <mx:Label x="41" y="107" text="499"/>  <mx:Image x="23" y="133" width="64" height="64" mouseMove="dragIt(event,'Fireworks',299);"  source="@Embed(source='../assets/057.png')"/>  <mx:Label x="41" y="205" text="299"/>  <mx:Image x="23" y="231" width="64" height="64" mouseMove="dragIt(event,'Flash',599);" source="@Embed(source='../assets/059.png')"/>  <mx:Label x="41" y="303" text="599"/>  </mx:Canvas>  <mx:Label x="210" y="61" text="购物篮" fontSize="12"/>  <mx:DataGrid x="129.5" y="102" id="cart" dataProvider="{cartContents}" dragEnter="dragEnterHandler(event);" dragDrop="dragDropHandler(event);" height="165" fontSize="12">    <mx:columns>      <mx:DataGridColumn headerText="产品" dataField="name"/>      <mx:DataGridColumn headerText="价格" dataField="price"/>    </mx:columns>  </mx:DataGrid>  <mx:Label x="186" y="292" text="总计：{total}" fontSize="12"/>  <mx:Label x="129.5" y="0" text="拖拽物品放入购物篮中" fontSize="12"/>  <mx:HRule x="5" y="20" width="390"/>  </mx:Application>
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