actionscript-3 - 动作脚本。如何禁用键盘？

Question

如何在动作脚本中禁用键盘键？

我正在创建 Flash“记忆”游戏，想发现 2 张相等的卡片。当发现第二张牌时，它会显示 750 毫秒，在此期间玩家不能做任何动作。当我使用这个mouseChildren = false;播放器时，这次不能用鼠标点击，但他可以使用键盘箭头/回车/空格/制表键……我需要暂时禁用它。

这是我的代码的一部分：

            {
                    trace("Wrong");
                    _message = "Wrong";
                    message_txt.text = _message;
                     _secondCard = event.currentTarget;


                    var timer:Timer = new Timer(750, 1);
                    timer.addEventListener(TimerEvent.TIMER_COMPLETE, flipBack);
                    timer.start();

                stage.addEventListener(KeyboardEvent.KEY_DOWN, blindKeyboard);//added here
                stage.addEventListener(KeyboardEvent.KEY_UP, blindKeyboard);//added here


                    mouseChildren = false;


                }
            }

function blindKeyboard(e:KeyboardEvent):void{ //added here function
    e.preventDefault();
    e.stopPropagation();
}

            protected function flipBack(event:TimerEvent):void
    {
        _firstCard.gotoAndPlay("flipBack");
        _secondCard.gotoAndPlay("flipBack");
        _firstCard.addEventListener(MouseEvent.CLICK, checkCards);
        _secondCard.addEventListener(MouseEvent.CLICK, checkCards);
        _firstCard = _secondCard = undefined; 
        mouseChildren = true;
    }

Answer 1

尝试

stage.addEventListener(KeyboardEvent.KEY_DOWN, blindKeyboard);
stage.addEventListener(KeyboardEvent.KEY_UP, blindKeyboard);
function blindKeyboard(e:KeyboardEvent):void{
    e.preventDefault();
    e.stopPropagation();
}

Answer 2

您可以只添加/删除侦听器的功能：

function addListeners():void
{
    // loop through and add the listeners for the cards
    // add keyboard listeners
}

function removeListeners():void
{
   // loop through and remove listeners from the cards
   // remove keyboard listeners
}

在设置计时器之前，请删除您的侦听器：

removeListeners();

然后在您的翻转计时器处理程序中，您只需调用 addListeners ：

addListeners();