闪光 – 在Actionscript 3中拖动时检测鼠标离开舞台

要获得所有这一切需要一点点黑客。您必须存储鼠标是否离开舞台，并相应地处理Event.MOUSE_LEAVE事件。这样做可以提供所有正常的鼠标功能，包括不要因为鼠标离开舞台而阻止拖动。由于用户可能会回到舞台上并继续拖动，因此等待用户在舞台上或者舞台上释放鼠标。

var mouSEOffStage:Boolean;

var bonk:YourDisplayObject = new YourDisplayObject()
addChild(bonk);
bonk.addEventListener(MouseEvent.MOUSE_DOWN,function():void {
  mouSEOffStage = false;

  bonk.startDrag();

  stage.addEventListener(MouseEvent.MOUSE_UP,mouseUp);
  stage.addEventListener(Event.MOUSE_LEAVE,mouseLeave);
  stage.addEventListener(MouseEvent.MOUSE_OUT,mouSEOut);
  stage.addEventListener(MouseEvent.MOUSE_OVER,mouSEOver);
})

private function mouseUp(e:MouseEvent) :void {
  trace("Mouse Up On Stage")
  bonk.stopDrag()
}

private function mouseLeave(e:Event) :void {
  if(mouSEOffStage){
    trace("mouse up and off stage");
    bonk.stopDrag();
  }else{
    trace("mouse has left the stage");
    //no reason to stop drag here as the user hasn't released the mouse yet
  }
}

private function mouSEOut(e:MouseEvent) :void {
  mouSEOffStage = true;
  trace("mouse has left the stage")
}

private function mouSEOver(e:MouseEvent) :void {
  mouSEOffStage = false;
  trace("mouse has come back on stage");
}

黑客是，当鼠标从舞台上释放时，MOUSE_LEAVE事件而不是MOUSE_UP事件被触发，因此您必须跟踪鼠标是否已经在播放时已经处于关闭状态。

拖动完成后，您当然希望删除与检测鼠标悬停和鼠标悬停相关联的所有事件侦听器，但该代码被遗漏以供读取。