一个简单的java游戏InputHandler问题

Question

private Player player;

public PlayerInputHandler(Player player){
    super();
    this.player = player;
}

@Override
public void keyPressed(KeyEvent pressedKey) {
    int keyCode = pressedKey.getKeyCode();

    if(keyCode == KeyEvent.VK_RIGHT){
        this.player.setCurrentWidthPos(this.player.getCurrentWidthPos() + 5);
        this.player.setIsPlayerMovingRight(true);
    }
    if(keyCode == KeyEvent.VK_LEFT){
        this.player.setCurrentWidthPos(this.player.getCurrentWidthPos() - 5);
        this.player.setIsPlayerMovingLeft(true);
    }
    if(keyCode == KeyEvent.VK_SPACE){
        if(this.player.getIsPlayerMovingLeft() == false && this.player.getIsPlayerMovingRight() == false){
            this.player.shoot();
        }
    }
}

@Override
public void keyTyped(KeyEvent typedKey) {

}

@Override
public void keyReleased(KeyEvent releasedKey) {
    int keyCode = releasedKey.getKeyCode();

    if(keyCode == KeyEvent.VK_RIGHT){
        this.player.setIsPlayerMovingRight(false);
    }
    if(keyCode == KeyEvent.VK_LEFT){

            this.player.setIsPlayerMovingLeft(false);

    }
}

}

Answer 1

我不是一个挥杆专家，但这就是正在发生的事情。当你按单个按钮时，比如说右箭头键，你会不断地得到新的按下键的事件。当仍然保持右箭头，然后按空格键并释放它时，您将获得空格键的按下键和释放键事件，而您不再从右箭头按钮获得任何按下键的事件。为什么会这样？正如我所说的，我不知道swing是如何工作的。

不管怎样，这是给你的解决办法。我问你在你没有提供的代码中是否有游戏循环，你有。你必须将玩家的位置更新移动到游戏循环的更新方法。

更改KeyListener：

public void keyPressed(KeyEvent pressedKey) {
    int keyCode = pressedKey.getKeyCode();

    if(keyCode == KeyEvent.VK_RIGHT){
        this.player.setIsPlayerMovingRight(true);
    }
    if(keyCode == KeyEvent.VK_LEFT){
        this.player.setIsPlayerMovingLeft(true);
    }
    if(keyCode == KeyEvent.VK_SPACE){
        if(this.player.getIsPlayerMovingLeft() == false && this.player.getIsPlayerMovingRight() == false){
            this.player.shoot();
        }
    }
}

this.player.setCurrentWidthPos()

if(player.getIsPlayerMovingRight()) {
    player.setCurrentWidthPos(this.player.getCurrentWidthPos() + 5);
}

if(player.getIsPlayerMovingLeft()) {
    this.player.setCurrentWidthPos(this.player.getCurrentWidthPos() - 5);
}