Flex 3:按键组合触发事件/功能 | 按键组合触发事件

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问题描述

在一个特定的画布中，我希望用户能够按组合键来触发事件(有点像旧的megadrive游戏中的作弊行为).虽然不知道从哪里开始.任何人都知道是否有可能，如果可以的话，您能给我一个如何开始的线索吗?

Within a specific canvas, I would like a user to be able to press a combination of keys which will trigger an event.(a bit like a cheat in an old megadrive game). Not sure where to start though. Anyone know if it is possible and if so could you give me a clue with how to start?

提前谢谢！

推荐答案

您可以将事件监听器添加到顶级应用程序以用于KeyboardEvent.KEY_DOWN事件，并在其中检查键组合.摘自本文:

You can add an eventListener to the top level application for the KeyboardEvent.KEY_DOWN event and check for key combinations there. From this article:

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
 layout="absolute" creationComplete="init()">
 <mx:Script>
 <![CDATA[
    private function init():void{
     this.addEventListener(MouseEvent.CLICK, clickHandler);
     this.addEventListener(KeyboardEvent.KEY_DOWN,keyPressed);
    }
    private function clickHandler(event:MouseEvent):void {
      stage.focus = this;
    }
    private function keyPressed(evt:KeyboardEvent):void{
       if(evt.ctrlKey && evt.keyCode == 65)
             trace("CTRL A is pressed");
       if(evt.ctrlKey && evt.keyCode == 66)
             trace("CTRL B is pressed");
   }
 ]]>
 </mx:Script>
</mx:Application>

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