如何检测多个按键按下事件在AS3？ [英] How to detect multiple key down event in as3?

问题描述

我刚开始学习AS3。

比方说，我有两个文本框在我的精灵。

我要移动文本框1，当我preSS左或右方向键，但我也想移动文本框2，当我同时文本字段1动如...的点播游戏（preSS空间，你可以拍摄导弹你移动时）。

我真的很喜欢我的发布源$ C ​​$ C ...但我确实不知道从哪里开始。

以下code移动文本框1，当我preSS箭头键...

我的code片断：

 私有函数keyHandler（事件：KeyboardEvent的）：无效
{

    开关（event.key code）
    {
        案例38：
            this._txt.y  -  = 10;
            打破;
        案例40：
            this._txt.y + = 10;
            打破;

        案例39：
            this._txt.x + = 10;
            打破;
        案例37：
            this._txt.x  -  = 10;
            打破;
    }


}
 

解决方案

 包{
    进口flash.display.Sprite;
    进口对象类型：flash.events.Event;
    进口flash.events.KeyboardEvent;
    进口flash.ui.Keyboard;
    / **
     * ...
     * @author www0z0k
     * /
    公共类KeyExample扩展Sprite {
        私人变种_theyAre pressed：对象= {};
        公共职能KeyExample（）{
            如果（阶段）的init（）;
            其他的addEventListener（Event.ADDED_TO_STAGE，INIT）;
        }

        私有函数初始化（五：事件）：无效{
            removeEventListener（Event.ADDED_TO_STAGE，INIT）;
            stage.addEventListener（KeyboardEvent.KEY_DOWN，onDown）;
            stage.addEventListener（KeyboardEvent.KEY_UP，onUp）;
        }

        私有函数onUp（E：的KeyboardEvent）：无效{
            _theyAre pressed [e.key code] = FALSE;
        }

        私有函数onDown（E：的KeyboardEvent）：无效{
            _theyAre pressed [e.key code] =真;
            如果（_theyAre pressed [Keyboard.SPACE]放大器;＆安培; _theyAre pressed [Keyboard.UP]）{
                //做任何事
            }
        }
    }
}
 

但请记住，这AFAIK键盘可以处理pssed同时按键$ P $数量有限，取决于硬件

I just got started learning AS3.

Let's say I have two textfields on my sprite.

I like to move textfield 1 when I press left or right arrow keys, but I also want to move textfield 2 when I press space while textfield 1 is moving like...an airplay game (you can shoot a missile while you're moving).

I really like to post my source code...but I actually have no idea where to begin.

the following code moves textfield 1 when I press arrow keys...

my code snippet:

private function keyHandler(event:KeyboardEvent):void
{

    switch(event.keyCode)
    {
        case 38:
            this._txt.y -= 10;
            break;
        case 40:
            this._txt.y += 10;
            break;

        case 39:
            this._txt.x += 10;
            break;
        case 37:
            this._txt.x -= 10;
            break;
    }


}

解决方案

package  {
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.KeyboardEvent;
    import flash.ui.Keyboard;
    /**
     * ...
     * @author www0z0k
     */
    public class KeyExample extends Sprite {
        private var _theyArePressed:Object = { };
        public function KeyExample() {
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);
        }

        private function init(e:Event):void {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            stage.addEventListener(KeyboardEvent.KEY_DOWN, onDown);
            stage.addEventListener(KeyboardEvent.KEY_UP, onUp);         
        }

        private function onUp(e:KeyboardEvent):void {
            _theyArePressed[e.keyCode] = false;
        }

        private function onDown(e:KeyboardEvent):void {
            _theyArePressed[e.keyCode] = true;
            if (_theyArePressed[Keyboard.SPACE] && _theyArePressed[Keyboard.UP]) {
                //do anything
            }
        }       
    }
}

but keep in mind that that AFAIK keyboards can handle limited quantity of keys pressed at the same time, depending on the hardware

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