1

我有以下代码（我frame.add(new LevelPanel())在我的 main 方法中执行 extends JFrame。出于某种原因，此代码对于KeyListener其他人来说正是它的样子，但它不识别任何东西。

当我按下一个键时，它至少应该打印出“到这里”（它没有）。该代码确实打印了面板，但面板对我按下的任何键都没有反应。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/*
 * Items represent the things in the level that can be picked up.
 * Subclasses: Gem
 * 
 * @author Tim Ochsner
 * @version 1.0 11/18/2012
 */

public class LevelPanel extends JPanel {
private Game game;
private Level level;
private Player player;
private char[][] table =
        {{'p', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f'},
        {'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'w', 'f', 'f', 'f', 'f', 'f'},
        {'f', 'f', 'f', 'f', 'w', 'f', 'f', 'f', 'f', 'w', 'f', 'f', 'f', 'f', 'f'},
        {'f', 'f', 'f', 'f', 'w', 'f', 'f', 'f', 'w', 'w', 'w', 'f', 'f', 'f', 'f'},
        {'f', 'f', 'f', 'f', 'w', 'f', 'f', 'f', 'f', 'f', 'f', 'w', 'f', 'f', 'f'},
        {'f', 'f', 'f', 'f', 'w', 'f', 'f', 'f', 'f', 'f', 'f', 'w', 'f', 'f', 'f'},
        {'f', 'f', 'f', 'f', 'w', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f'},
        {'w', 'f', 'f', 'f', 'w', 'w', 'w', 'w', 'w', 'f', 'f', 'f', 'f', 'f', 'f'},
        {'w', 'w', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'w', 'f'},
        {'w', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'w', 'f'},
        {'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'w', 'f'},
        {'f', 'f', 'f', 'f', 'f', 'f', 'w', 'w', 'w', 'w', 'f', 'f', 'w', 'w', 'f'},
        {'f', 'f', 'w', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'w', 'f', 'f', 'w', 'f'},
        {'f', 'f', 'w', 'f', 'f', 'f', 'f', 'f', 'f', 'w', 'f', 'f', 'f', 'f', 'f'},
        {'w', 'w', 'w', 'w', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f', 'f'}};

public LevelPanel(Game game)
{
    this.game = game;
    player = game.getPlayer();
    level = new Level(game, table);
    setBackground(Color.WHITE);
    addKeyListener(new ArrowListener());

}

public void paintComponent(Graphics g)
{
    super.paintComponent(g);
    level.draw(g);
}

public class ArrowListener implements KeyListener {

    public void keyPressed(KeyEvent e) {
        System.out.println("Got here");
        if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
            if (!(player.getCol() == 14) && level.getTileLayout()[player.getRow() + 1][player.getCol()].isPassable()) {
                System.out.println("Got here");
                player.move(player.getRow() + 1, player.getCol());
                table[player.getRow()][player.getCol()] = 'f';
                table[player.getRow() + 1][player.getCol()] = 'p';
            }
        }

    }

    public void keyReleased(KeyEvent e) {
        System.out.println("Got here");

    }

    public void keyTyped(KeyEvent arg0) {
            System.out.println("Got here");         
    }

}

}
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1 回答 1

1

KeyListener是一个善变的情妇，我建议您避免使用它们以支持键绑定

KeyListener只有在 1- 组件可聚焦且 2- 组件具有焦点时才会触发事件。键绑定允许您绕过此限制。

如果您必须使用KeyListener，首先调用setFocusable(true)您的LevelPanel，然后调用requestFocusInWindow。

于 2012-11-26T05:52:17.927 回答