Flex笔记之两个mx:List之间拖拽数据。

list dataProvider（a,b,c）和list1dataProvider(a,d,e)实现list1中的数据拖拽到list中去并且检测list里面有没有这个拖拽数据，如果有则拖拽失败，没有成功拖拽。

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<mx:HBox verticalAlign="middle">
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??????<mx:List id="list"? dataProvider="{npcMonArrData}" height="200"? width="100" itemRenderer="itemRender"
???????? dragEnabled="true"
???????? dropEnabled="false"
????????? dragMoveEnabled="true"?
???????? click="clickHandler(event)"?? doubleClick="doubleClickHandler(event)">
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??????</mx:List>
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??????<mx:List id="list1"? dataProvider="{arrayData}"? height="250"? width="100" itemRenderer="itemRender"
???????? dragEnabled="true"
???????? dropEnabled="false"
???????? dragMoveEnabled="true"? dragEnter="dragEnterHandler(event);"
?????????
???????? >
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??????</mx:List>
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?????</mx:HBox>

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protected function dragEnterHandler(evt:DragEvent):void???{????List(evt.target).removeEventListener(DragEvent.DRAG_ENTER,dragEnterHandler);????var listItem:Object = evt.dragSource.dataForFormat( "items");????var obj1:Object = listItem["0"];????list.dropEnabled=true;????for(var i:int=0;i<npcMonArrData.length;i++) {?????var obj:Object = npcMonArrData.getItemAt(i);?????if(obj1["npcId"]==obj["npcId"]){??????list.dropEnabled=false;??????break;?????}????}???}