package{
  import flash.display.DisplayObject;
  import flash.display.Sprite;
  import flash.events.NativeDragEvent;
  import flash.desktop.DragManager;
 
  public class Main extends Sprite{
    private var drop_target:Sprite = new Sprite();
 
    public function Main(){
      drop_target.addEventListener(NativeDragEvent.NATIVE_DRAG_ENTER, DaDEnterHandler);
      drop_target.addEventListener(NativeDragEvent.NATIVE_DRAG_DROP, DaDDropHandler);
 
      addChild(drop_target);
      changeColor(0x000000);
    }
 
    public function DaDEnterHandler(nde:NativeDragEvent):void{
      DragManager.acceptDragDrop(nde.target as DisplayObject);
      changeColor(0x888888);
    }
 
    public function DaDDropHandler(nde:NativeDragEvent):void{
      changeColor(0xFFFFFF);
    }
 
    private function changeColor(color:uint):void{
      drop_target.graphics.beginFill(color);
      drop_target.graphics.drawRect(0, 0, 100, 100);
      drop_target.graphics.endFill();
    }
  }
}