将JLayerPane添加到JFrame时延迟

Question

public class Game_Screen extends JLayeredPane {
    
    private JLabel hangman;
    
    public Game_Screen() {
        super();
        super.setBounds(0, 0, 1920, 1080);
        
        hangman = new JLabel(new ImageIcon(Game_Screen.class.getResource("/images/hangman10.jpg")));
        hangman.setBounds(0, 0, 1920, 1080);
        
        add(hangman, Integer.valueOf(0));
    }
}

public class Home_Screen extends Game_Screen {
    
    private JLabel title;
    private JLabel score;
    private JButton start;
    
    public Home_Screen() {
        super();
        title = new JLabel("HANGMAN");
        title.setBounds(490, 170, 942, 217);
        title.setFont(new Font("Press Start", Font.PLAIN, 100));
        add(title, Integer.valueOf(1));
        
        score = new JLabel("High Score: 0");
        score.setBounds(635, 330, 470, 67);
        score.setFont(new Font("Press Start", Font.PLAIN, 30));
        add(score, Integer.valueOf(1));
        
        start = new JButton("START");
        start.setBounds(635,400,400,120);
        start.setBorderPainted(false);
        start.setFont(new Font("Press Start", Font.PLAIN, 60));
        add(start, Integer.valueOf(1));
    }
    
    public void addStartButtonListener(ActionListener a) {
        start.addActionListener(a);
    }
}

public class HangmanGame extends JFrame {
    
    private Home_Screen home;
    private Level_Screen level;
    private Win_Screen win;
    private Lose_Screen lose;
    private Play_Screen play;
    
    public HangmanGame() {
        super("Hangman");
        
        home = new Home_Screen();
        level = new Level_Screen();
        win = new Win_Screen();
        lose = new Lose_Screen();
        play = new Play_Screen();
        add(home);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(new Dimension(1920,1080));
        setLayout(null);
        setVisible(true);


    }
    
    public Home_Screen getHomeScreen() {
        return home;
    }
    
    public Level_Screen getLevelScreen() {
        return level;
    }
    
    public Win_Screen getWinScreen() {
        return win;
    }
    
    public Lose_Screen getLoseScreen() {
        return lose;
    }
    
    public Play_Screen getPlayScreen() {
        return play;
    }
}

控制器类

public class Controller {
    
    private HangmanGame game;
    
    public Controller() {
        //game = g;
        game = new HangmanGame();
        game.getHomeScreen().addStartButtonListener(new startButtonListener());
    }
    
    class startButtonListener implements ActionListener{

        @Override
        public void actionPerformed(ActionEvent e) {
            game.remove(game.getHomeScreen());
            game.add(game.getLevelScreen());
            
        }
        
    }

}

Answer 1

我要在这里惹你一点麻烦，坚持住，我相信你会感激的。

一是秋千偷懒。当您对组件或布局进行更改时，您需要告诉Swing您希望对其进行更新。

这意味着，添加或删除组件时，通常会调用revalidate和repaint。由于没有大量使用布局管理器，因此可以保留revalidate。

取而代之的是，我想让事情尽可能地变得愚蠢，所以如果我需要改变事情，并不是每次都完全重写。

相反，在下面的示例中，我在HangmanGame上使用了CardLayout并为Home_Screen提供了一个“委托”，它告诉“开始”何时发生（我不关心如何发生，只是它发生了），然后允许HangmanGame控制导航。

这通常是一个小事情，你可以争辩说可以使用某种“导航控制器”，但你需要在away中这样做，这确实暴露了实现细节，而且...这是一个混乱的...：p

import java.awt.CardLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;

public class Controller {

    private HangmanGame game;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Controller();
            }
        });
    }

    public Controller() {
        //game = g;
        game = new HangmanGame();
    }

    public class HangmanGame extends JFrame {

        private Home_Screen home;
        private JPanel level;

        public HangmanGame() {
            super("Hangman");

            CardLayout cardLayout = new CardLayout();

            home = new Home_Screen(new HomeDelegate() {
                @Override
                public void startGame() {
                    cardLayout.show(getContentPane(), "level");
                }
            });
            level = new JPanel();
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            setSize(new Dimension(1920, 1080));
            setLayout(cardLayout);
            add(home, "home");
            add(level, "level");
            setVisible(true);

        }
    }

    public interface HomeDelegate {

        public void startGame();
    }

    public class Home_Screen extends Game_Screen {

        private JLabel title;
        private JLabel score;
        private JButton start;

        public Home_Screen(HomeDelegate delegate) {
            super();
            title = new JLabel("HANGMAN");
            title.setBounds(490, 170, 942, 217);
            title.setFont(new Font("Press Start", Font.PLAIN, 100));
            add(title, Integer.valueOf(1));

            score = new JLabel("High Score: 0");
            score.setBounds(635, 330, 470, 67);
            score.setFont(new Font("Press Start", Font.PLAIN, 30));
            add(score, Integer.valueOf(1));

            start = new JButton("START");
            start.setBounds(635, 400, 400, 120);
            start.setBorderPainted(false);
            start.setFont(new Font("Press Start", Font.PLAIN, 60));
            add(start, Integer.valueOf(1));

            start.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent arg0) {
                    delegate.startGame();
                }
            });
        }
    }

    public class Game_Screen extends JLayeredPane {

        private JLabel hangman;

        public Game_Screen() {
            super();

            hangman = new JLabel(new ImageIcon(getClass().getResource("/images/hangman10.png")));
            hangman.setBounds(0, 0, 1920, 1080);

            add(hangman, Integer.valueOf(0));
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(1920, 1080);
        }
    }
}