AS3键盘控制

第一种方式：

package com.game.keymanager {    

    import flash.display.Stage;
    import flash.events.KeyboardEvent;
    import flash.ui.Keyboard;
    import flash.utils.Proxy;
    import flash.utils.flash_proxy;    

    /**   

     * The KeyObject class recreates functionality of   

     * Key.isDown of ActionScript 1 and 2   

     *   

     * Usage:   

     * var key:KeyObject = new KeyObject(stage);   

     * if (key.isDown(key.LEFT)) { ... }   

     */   

    dynamic public class KeyObject extends Proxy {    

        private static var stage:Stage;
        private static var keysDown:Object;  

        public function KeyObject(stage:Stage) {   

            construct(stage);    

        }    

        public function construct(stage:Stage):void {    

            KeyObject.stage = stage;    

            keysDown = new Object();    

            stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed);    

            stage.addEventListener(KeyboardEvent.KEY_UP, keyReleased);    

        }              

        flash_proxy override function getProperty(name:*):* {    

            return (name in Keyboard) ? Keyboard
[name] : -1;    

        }    

        public function isDown(keyCode:uint):Boolean {    

            return Boolean(keyCode in keysDown);    

        }    

        public function deconstruct():void {    

            stage.removeEventListener(KeyboardEvent.KEY_DOWN, keyPressed);    

            stage.removeEventListener(KeyboardEvent.KEY_UP, keyReleased);    

            keysDown = new Object();    

            KeyObject.stage = null;    

        }    

        private function keyPressed(evt:KeyboardEvent):void {    

            keysDown
[evt.keyCode] = true;    

        }               

        private function keyReleased(evt:KeyboardEvent):void {    

            delete keysDown
[evt.keyCode];    

        }    

    }    

}   

 package com.game.keymanager {
    import flash.display.Stage;
    import flash.events.KeyboardEvent;
    import flash.ui.Keyboard;
    import flash.utils.Proxy;
    import flash.utils.flash_proxy; 

    /**
     * The KeyObject class recreates functionality of
     * Key.isDown of ActionScript 1 and 2
     *
     * Usage:
     * var key:KeyObject = new KeyObject(stage);
     * if (key.isDown(key.LEFT)) { ... }
     */
    dynamic public class KeyObject extends Proxy { 

        private static var stage:Stage;
        private static var keysDown:Object; 

        public function KeyObject(stage:Stage) {
            construct(stage);
        } 

        public function construct(stage:Stage):void {
            KeyObject.stage = stage;
            keysDown = new Object();
            stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed);
            stage.addEventListener(KeyboardEvent.KEY_UP, keyReleased);
        } 

        flash_proxy override function getProperty(name:*):* {
            return (name in Keyboard) ? Keyboard[name] : -1;
        } 

        public function isDown(keyCode:uint):Boolean {
            return Boolean(keyCode in keysDown);
        } 

        public function deconstruct():void {
            stage.removeEventListener(KeyboardEvent.KEY_DOWN, keyPressed);
            stage.removeEventListener(KeyboardEvent.KEY_UP, keyReleased);
            keysDown = new Object();
            KeyObject.stage = null;
        } 

        private function keyPressed(evt:KeyboardEvent):void {
            keysDown[evt.keyCode] = true;
        } 

        private function keyReleased(evt:KeyboardEvent):void {
            delete keysDown[evt.keyCode];
        }
    }
} 

暂时不多写了，因为csdn博客出问题，经常写文章都出错。真郁闷，先发一个键盘控制的类。可以进行使用的，在网上看到的。有兴趣尝试一下。用法很简单

第二种方式：使用了一种比较简洁的方式，同样是收集网上一种写法，感觉这种做法也是可以

使用的方法 使用 if(KEY.isDown(键值))这样就可以实现控制到我们希望的对象了。

package com.hero.ImageManager    

{    

    /*键盘按键判断类.   

    使用时先初始化要监听的对象.再判断哪个键被按下了.   

    KEY.init(stage);   

    KEY.isDown(40);返回true或false   

    */   

    import flash.events.Event;    

    import flash.events.KeyboardEvent;    

    import flash.display.DisplayObject;    

    public class KEY {    

        private static  var keyObj:KEY = null;    

        private static  var keys:Object;    

        public static function init(_stage:DisplayObject):void {    

            if (keyObj == null) {    

                keys = {};    

                _stage.addEventListener(KeyboardEvent.KEY_DOWN, KEY.keyDownHandler);    

                _stage.addEventListener(KeyboardEvent.KEY_UP, KEY.keyUpHandler);    

            }    

        }    

        public static function isDown( keyCode:uint ):Boolean {    

            return keys
[keyCode];           

        }    

        private static function keyDownHandler( e:KeyboardEvent ):void {    

            keys
[e.keyCode] = true;    

            trace( keys
[e.keyCode]);    

        }    

        private static function keyUpHandler( e:KeyboardEvent ):void {    

            delete keys
[e.keyCode];    

        }
    }
}
 

 package com.hero.ImageManager {
    /*键盘按键判断类.
    使用时先初始化要监听的对象.再判断哪个键被按下了.
    KEY.init(stage);
    KEY.isDown(40);返回true或false
    */
    import flash.events.Event;
    import flash.events.KeyboardEvent;
    import flash.display.DisplayObject;
    public class KEY {
        private static  var keyObj:KEY = null;
        private static  var keys:Object;
        public static function init(_stage:DisplayObject):void {
            if (keyObj == null) {
                keys = {};
                _stage.addEventListener(KeyboardEvent.KEY_DOWN, KEY.keyDownHandler);
                _stage.addEventListener(KeyboardEvent.KEY_UP, KEY.keyUpHandler);
            }
        }
        public static function isDown( keyCode:uint ):Boolean {
            return keys[keyCode]; 

        }
        private static function keyDownHandler( e:KeyboardEvent ):void {
            keys[e.keyCode] = true;
            trace( keys[e.keyCode]);
        }
        private static function keyUpHandler( e:KeyboardEvent ):void {
            delete keys[e.keyCode];
        }
    } 

} 

第三种是使用：开关式的判断

 private var Isleft:Boolean;
 private var Isright:Boolean;
 private var Isup:Boolean;
 private var Isdown:Boolean;

 stage.addEventListener(KeyboardEvent.KEY_DOWN,keydown);
stage.addEventListener(KeyboardEvent.KEY_UP,keyup);

进行简单判定

private function keydown(event:Event):void   

        {    

            if (event.keyCode==Keyboard.UP)    

            {    

                Isup=true;    

            }    

            else if (event.keyCode==Keyboard.DOWN)    

            {    

                Isdown=true;
            }    

            else if (event.keyCode==Keyboard.LEFT)    

            {    

                Isleft=true;    

            }    

            else if (event.keyCode==Keyboard.RIGHT)    

            {
                Isright=true;
            }   

        }    

        private function keyup(event:Event):void   

        {    

            if (event.keyCode==Keyboard.UP)    

            {
                Isup=false;    

            }    

            else if (event.keyCode==Keyboard.DOWN)    

            {    

                Isdown=false;    

            }    

            else if (event.keyCode==Keyboard.LEFT)    

            {    

                Isleft=false;    

            }    

            else if (event.keyCode==Keyboard.RIGHT)    

            {
                Isright=false;
            }    

        }   

private function keydown(event:Event):void
        {
            if (event.keyCode==Keyboard.UP)
            {
                Isup=true;
            }
            else if (event.keyCode==Keyboard.DOWN)
            {
                Isdown=true;
            }
            else if (event.keyCode==Keyboard.LEFT)
            { 

                Isleft=true;
            }
            else if (event.keyCode==Keyboard.RIGHT)
            {
                Isright=true;
            }
        }
        private function keyup(event:Event):void
        { 

            if (event.keyCode==Keyboard.UP)
            {
                Isup=false; 

            }
            else if (event.keyCode==Keyboard.DOWN)
            {
                Isdown=false;
            }
            else if (event.keyCode==Keyboard.LEFT)
            { 

                Isleft=false;
            }
            else if (event.keyCode==Keyboard.RIGHT)
            {
                Isright=false; 

            }
        } 

通过开关式的组合方式进行组合，这种也是一种常见的方式。

通过使用上面三种方式，我们可以简化我们在键盘上的控制。我个人还比较喜欢这三种方式。

通过上面的键盘控制，还可以配合到动画进行创作。

addEventListener(Event.ENTER_FRAME,GameLoop);

好，有兴趣可以把这些使用方式记录下来组合自己的键盘控制方式。

转载自：http://wgcode.iteye.com/