Let current event target show the drop feedback
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="initApp();">
<mx:Script>
import mx.managers.DragManager;
import mx.events.DragEvent;
import mx.collections.ArrayCollection;
private function initApp():void {
firstList.dataProvider = new ArrayCollection([
{label:"First", data:"1"},
{label:"Second", data:"2"},
{label:"Third", data:"3"},
{label:"Fourth", data:"4"}
]);
secondList.dataProvider = new ArrayCollection([]);
}
private function dragOverHandler(event:DragEvent):void {
event.preventDefault();
event.currentTarget.showDropFeedback(event);
if (event.dragSource.hasFormat("items")){
if (event.ctrlKey) {
DragManager.showFeedback(DragManager.COPY);
return;
}
}
DragManager.showFeedback(DragManager.NONE);
}
private function dragDropHandler(event:DragEvent):void {
dragExitHandler(event);
}
private function dragExitHandler(event:DragEvent):void {
}
</mx:Script>
<mx:HBox id="myHB">
<mx:List id="firstList" dragEnabled="true"/>
<mx:List id="secondList"
dropEnabled="true"
dragMoveEnabled="true"
dragOver="dragOverHandler(event);"
dragDrop="dragExitHandler(event);"
dragExit="dragExitHandler(event);"/>
</mx:HBox>
</mx:Application>
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