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基本上我试图在我的程序中几乎不添加键盘事件侦听器，然后开始迭代地构建它们。问题是，即使是从多个教程中获得最简单的东西，显然也是个问题。我不太确定我现在缺少什么。我试过添加东西、改变东西和取出东西。但是鉴于以下代码，我看不到屏幕上显示任何消息。为什么？

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:local="*" xmlns:mx="http://www.adobe.com/2006/mxml" width="480" height="600" layout="absolute" creationComplete="onCreationComplete()">
<mx:Script>
    <![CDATA[
        import mx.controls.Alert;
        import flash.events.KeyboardEvent;

        private function onStart(pEvent:Event):void {
            vs.selectedChild = mm;
        }

        private function onNewGame(pEvent:Event):void {
            vs.selectedChild = game;
        }



        private function onCreationComplete():void {
            addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
            stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);

            addEventListener(KeyboardEvent.KEY_UP, onKeyDown);
            stage.addEventListener(KeyboardEvent.KEY_UP, onKeyDown);
        }

        private function onKeyDown(pEvent:KeyboardEvent):void {
            Alert.show("spam");
            Alert.show(pEvent.toString());
        }
    ]]>
</mx:Script>
<mx:ViewStack id="vs" creationComplete="vs.selectedChild = ts">
    <local:TitleScreen id="ts" creationComplete="ts.addEventListener(TitleScreen.START, onStart);" />
    <local:MainMenu id="mm" creationComplete="mm.addEventListener(MainMenu.NEW_GAME, onNewGame);" />
    <local:Game id="game" />
</mx:ViewStack>
</mx:Application>
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1 回答 1

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不能stage直接使用。而是使用以下代码：

    private function onCreationComplete():void {
        systemManager.stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
        systemManager.stage.addEventListener(KeyboardEvent.KEY_UP, onKeyDown);
    }
于 2012-09-15T19:06:14.053 回答