Spark WindowedApplication，監視器keyUp事件

Question

我有一個WindowedApplication，我需要監視一個keyUp，以便我可以關閉按下的轉義鍵上的應用程序。然而，我的代碼是不工作：

<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
         xmlns:s="library://ns.adobe.com/flex/spark" 
         xmlns:mx="library://ns.adobe.com/flex/mx" 
         keyUp="windowedapplication1_keyUpHandler(event)"> 

<fx:Script> 
     <![CDATA[ 

      protected function windowedapplication1_keyUpHandler(event:KeyboardEvent):void 
      { 
       //Monitor key press {ESC} 
       if(event.keyCode == 27){ 
        exit(); 
       } 
       else{ 
        trace("key = " + event.keyCode); 
       } 
      } 

     ]]> 
</fx:Script> 

看來，這個事件不點火可言，我甚至試圖重寫keyUpHandler並描繪出一些信息，但一無所獲。

Answer 1

我在Adobe論壇上找到了this similar question，它幫助解決了這個問題。

我解決了通過收聽applicationComplete，然後在處理程序附加keyUp聽衆stage。

<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
         xmlns:s="library://ns.adobe.com/flex/spark" 
         xmlns:mx="library://ns.adobe.com/flex/mx" 
         applicationComplete="init()"> 

<fx:Script> 
     <![CDATA[ 

      protected function init():void 
      { 
       stage.addEventListener(KeyboardEvent.KEY_UP, windowedapplication1_keyUpHandler); 
      } 

      protected function windowedapplication1_keyUpHandler(event:KeyboardEvent):void 
      { 
       //Monitor key press {ESC} 
       if(event.keyCode == 27){ 
        exit(); 
       } 
       else{ 
        trace("key = " + event.keyCode); 
       } 
      }  

     ]]> 
</fx:Script>