Adobe Flash CS6 AS3：KeyUp 处理程序在 KeyDown 处理程序之后立即触发

Question

所以在我的代码中，我试图让你有两个玩家，每个玩家都有自己的按键和按键处理程序，在我的附加代码中清楚地标记，并且在他们的我处理运动，玩家一有 WSAD，玩家二使用左、右、上和下键，但是，每当我按下相关的按键处理程序时，它会立即立即触发按键处理程序，我不知道为什么，这是我的代码，如果有人可以提供帮助，那就太好了！ :)

import flash.display.MovieClip;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;

public class Main extends MovieClip{

    var playerOneLeft:Boolean = new Boolean(false);
    var playerOneRight:Boolean = new Boolean(false);
    var playerOneUp:Boolean = new Boolean(false);
    var playerOneDown:Boolean = new Boolean(false);

    var playerTwoLeft:Boolean = new Boolean(false);
    var playerTwoRight:Boolean = new Boolean(false);
    var playerTwoUp:Boolean = new Boolean(false);
    var playerTwoDown:Boolean = new Boolean(false);

    var playerSpeed:int = 5;

    var gamePage:GamePage;

    public function Main(){
        gamePage = new GamePage();
        addChild(gamePage);
        addAllPlayerHandlers();
    }

    public function playerOneKeyDownHandler(event:KeyboardEvent){
        if(event.keyCode == Keyboard.A){
            playerOneLeft = true;
            trace("a");
        }
        else if(event.keyCode == Keyboard.D){
            playerOneRight = true;
            trace("d");
        }
        else if(event.keyCode == Keyboard.W){
            playerOneUp = true;
            trace("w");
        }
        else if(event.keyCode == Keyboard.S){
            playerOneDown = true;
            trace("s");
        }
    }

    public function playerOneKeyUpHandler(event:KeyboardEvent){
        if(event.keyCode == Keyboard.A){
            playerOneLeft = false;
            trace("a");
        }
        else if(event.keyCode == Keyboard.D){
            playerOneRight = false;
            trace("d");
        }
        else if(event.keyCode == Keyboard.W){
            playerOneUp = false;
            trace("w");
        }
        else if(event.keyCode == Keyboard.S){
            playerOneDown = false;
            trace("s");
        }
    }

    public function playerTwoKeyDownHandler(event:KeyboardEvent){
        if(event.keyCode == Keyboard.LEFT){
            playerTwoLeft = true;
            trace("left");
        }
        else if(event.keyCode == Keyboard.RIGHT){
            playerTwoRight = true;
            trace("right");
        }
        else if(event.keyCode == Keyboard.UP){
            playerTwoUp = true;
            trace("up");
        }
        else if(event.keyCode == Keyboard.DOWN){
            playerTwoDown = true;
            trace("down");
        }
    }

    public function playerTwoKeyUpHandler(event:KeyboardEvent){
        if(event.keyCode == Keyboard.LEFT){
            playerTwoLeft = false;
            trace("left");
        }
        else if(event.keyCode == Keyboard.RIGHT){
            playerTwoRight = false;
            trace("right");
        }
        else if(event.keyCode == Keyboard.UP){
            playerTwoUp = false;
            trace("up");
        }
        else if(event.keyCode == Keyboard.DOWN){
            playerTwoDown = false;
            trace("down");
        }
    }

    public function playerMovementHandler(event:Event):void{
        if(playerOneLeft){
            gamePage.playerOne.x -= playerSpeed;
        }
        else if(playerOneRight){
            gamePage.playerOne.x += playerSpeed;
        }
        else if(playerOneUp){
            gamePage.playerOne.y += playerSpeed;
        }
        else if(playerOneDown){
            gamePage.playerOne.y -= playerSpeed;
        }

        if(playerTwoLeft){
            gamePage.playerTwo.x -= playerSpeed;
        }
        else if(playerTwoRight){
            gamePage.playerTwo.x += playerSpeed;
        }
        else if(playerTwoUp){
            gamePage.playerTwo.y += playerSpeed;
        }
        else if(playerTwoDown){
            gamePage.playerTwo.y -= playerSpeed;
        }
    }

    public function playerOneCollision(event:Event):void{
        if(gamePage.playerOne.hitTestObject(gamePage.leftWall)){
            gamePage.playerOne.x += playerSpeed;
        }
        if(gamePage.playerOne.hitTestObject(gamePage.rightWall)){
            gamePage.playerOne.x -= playerSpeed;
        }
        if(gamePage.playerOne.hitTestObject(gamePage.topWall)){
            gamePage.playerOne.y -= playerSpeed;
        }
        if(gamePage.playerOne.hitTestObject(gamePage.bottomWall)){
            gamePage.playerOne.y += playerSpeed;
        }
        if(gamePage.playerOne.hitTestObject(gamePage.middleWall)){
            gamePage.playerOne.x -= playerSpeed;
        }
    }

    public function playerTwoCollision(event:Event):void{
        if(gamePage.playerTwo.hitTestObject(gamePage.leftWall)){
            gamePage.playerTwo.x += playerSpeed;
        }
        if(gamePage.playerTwo.hitTestObject(gamePage.rightWall)){
            gamePage.playerTwo.x -= playerSpeed;
        }
        if(gamePage.playerTwo.hitTestObject(gamePage.topWall)){
            gamePage.playerTwo.y -= playerSpeed;
        }
        if(gamePage.playerTwo.hitTestObject(gamePage.bottomWall)){
            gamePage.playerTwo.y += playerSpeed;
        }
        if(gamePage.playerTwo.hitTestObject(gamePage.middleWall)){
            gamePage.playerTwo.x += playerSpeed;
        }
    }

    public function addPlayerMovementHandler(){
        stage.addEventListener(Event.ENTER_FRAME,playerMovementHandler);
    }

    public function addPlayerKeyHandlers(){
        stage.addEventListener(KeyboardEvent.KEY_DOWN,playerOneKeyDownHandler);
        stage.addEventListener(KeyboardEvent.KEY_DOWN,playerOneKeyUpHandler);
        stage.addEventListener(KeyboardEvent.KEY_UP,playerTwoKeyDownHandler);
        stage.addEventListener(KeyboardEvent.KEY_UP,playerTwoKeyUpHandler);
    }

    public function addPlayerCollisionHandlers(){
        gamePage.playerOne.addEventListener(Event.ENTER_FRAME,playerOneCollision);
        gamePage.playerTwo.addEventListener(Event.ENTER_FRAME,playerTwoCollision);
    }

    public function addAllPlayerHandlers(){
        addPlayerKeyHandlers();
        addPlayerCollisionHandlers();
        addPlayerMovementHandler();
    }
}

Answer 1

when ever I press the relative key down handler, it immediately fires the key up handler straight after

这是因为您将他们注册为

stage.addEventListener(KeyboardEvent.KEY_DOWN,playerOneKeyDownHandler);
stage.addEventListener(KeyboardEvent.KEY_DOWN,playerOneKeyUpHandler); // this is for type KEY_DOWN, but the handler is "Up"
stage.addEventListener(KeyboardEvent.KEY_UP,playerTwoKeyDownHandler); //that looks suspicious, too
stage.addEventListener(KeyboardEvent.KEY_UP,playerTwoKeyUpHandler);

您应该吸取的教训是，您编写代码的复制和粘贴方法是一种不好的做法。你不应该重复自己。所有这些重复的代码都会导致类似手头的问题。

Adobe Flash CS6 AS3：KeyUp 处理程序在 KeyDown 处理程序之后立即触发

Adobe Flash CS6 AS3: KeyUp Handler triggers immediately after KeyDown Handler

flash

actionscript-3