Flex 拖拽删除DataGrid中的某一项。

DragManager的学习、使用。
示例：

 

blog.flexexamples.com/wp-content/uploads/DragManager_acceptDragDrop_test/bin/main.html

代码：

<? xml version="1.0" encoding="utf-8" ?>
<!-- http://blog.flexexamples.com/2008/04/16/removing-items-from-a-flex-datagrid-control-using-the-dragmanager-class/ -->
< mx:Application xmlns:mx ="http://www.adobe.com/2006/mxml"
         layout ="vertical"
         verticalAlign ="middle"
         backgroundColor ="white" >

     < mx:Script >
         <![CDATA[
             import mx.core.IUIComponent;
             import mx.events.DragEvent;
             import mx.managers.DragManager;

             private function image_dragEnter(evt:DragEvent):void {
                 var obj:IUIComponent = IUIComponent(evt.currentTarget);
                 DragManager.acceptDragDrop(obj);
             }

             private function image_dragDrop(evt:DragEvent):void {
                 var item:Object = dataGrid.selectedItem;
                 var idx:int = arrColl.getItemIndex(item);
                 arrColl.removeItemAt(idx);
             }
         ]]>
     </ mx:Script >

     < mx:ArrayCollection id ="arrColl" >
         < mx:source >
             < mx:Array >
                 < mx:Object c1 ="r1.c1" c2 ="r1.c2" c3 ="r1.c3" c4 ="r1.c4" />
                 < mx:Object c1 ="r2.c1" c2 ="r2.c2" c3 ="r2.c3" c4 ="r2.c4" />
                 < mx:Object c1 ="r3.c1" c2 ="r3.c2" c3 ="r3.c3" c4 ="r3.c4" />
                 < mx:Object c1 ="r4.c1" c2 ="r4.c2" c3 ="r4.c3" c4 ="r4.c4" />
                 < mx:Object c1 ="r5.c1" c2 ="r5.c2" c3 ="r5.c3" c4 ="r5.c4" />
                 < mx:Object c1 ="r6.c1" c2 ="r6.c2" c3 ="r6.c3" c4 ="r6.c4" />
                 < mx:Object c1 ="r7.c1" c2 ="r7.c2" c3 ="r7.c3" c4 ="r7.c4" />
                 < mx:Object c1 ="r8.c1" c2 ="r8.c2" c3 ="r8.c3" c4 ="r8.c4" />
                 < mx:Object c1 ="r9.c1" c2 ="r9.c2" c3 ="r9.c3" c4 ="r9.c4" />
             </ mx:Array >
         </ mx:source >
     </ mx:ArrayCollection >

     < mx:Panel title ="Drag DataGrid item over the trash icon to remove item"
             styleName ="opaquePanel" >
         < mx:DataGrid id ="dataGrid"
                 dataProvider =" {arrColl} "
                 dragEnabled ="true"
                 width ="400"
                 rowCount ="6"
                 verticalScrollPolicy ="on" >
             < mx:columns >
                 < mx:DataGridColumn dataField ="c1"
                         headerText ="Column 1" />
                 < mx:DataGridColumn dataField ="c2"
                         headerText ="Column 2" />
                 < mx:DataGridColumn dataField ="c3"
                         headerText ="Column 3" />
                 < mx:DataGridColumn dataField ="c4"
                         headerText ="Column 4" />
             </ mx:columns >
         </ mx:DataGrid >

         < mx:ControlBar horizontalAlign ="right" >
             < mx:Image id ="image"
                     source ="@Embed('assets/iconUninstall.png')"
                     dragDrop ="image_dragDrop(event);"
                     dragEnter ="image_dragEnter(event);" />
         </ mx:ControlBar >
     </ mx:Panel >

</ mx:Application >