Question

在KeyboardEvent对象中，我遇到了关键事件，有没有办法知道事件是第一次按下，还是按下按键时重复？我想在按下键时切换设置;我可以听一下按键，但我更喜欢按下按键后立即采取动作...只要我能够在生成按键重复事件时阻止它来回切换。

Answer 1

经过测试和工作

import flash.events.KeyboardEvent;

stage.addEventListener(KeyboardEvent.KEY_DOWN, onDown);
stage.addEventListener(KeyboardEvent.KEY_UP, onUp);

var keys:Object = {};

function onDown(e:KeyboardEvent):void {
    if( ! Boolean(e.keyCode in keys)) {
        trace("First Time");        
        keys[e.keyCode] = true;
    }       
}

function onUp(e:KeyboardEvent):void {
    delete keys[e.keyCode];
}

将密钥代码存储在对象中以及在密钥上使用delete的想法最初来自Senoculars库。见http://www.senocular.com/flash/actionscript/

Answer 2

最简单的方法是删除或禁用KEY_DOWN侦听器中带有标记的KEY_DOWN侦听器，然后在KEY_UP中添加或启用它。

Answer 3

stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);

private function onKeyDown(event:KeyboardEvent):void
{
    if (event.keyCode == Keyboard.SPACE)
    {

        stage.removeEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);

        stage.addEventListener(KeyboardEvent.KEY_UP, onKeyUp);

    }
}

private function onKeyUp(event:KeyboardEvent):void
{
    if (event.keyCode == Keyboard.SPACE)

        stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);

        stage.removeEventListener(KeyboardEvent.KEY_UP, onKeyUp);

    }
}

仅在AS3中检测第一个按键事件

3 个答案: