如何在 JFrame 中切换 JPanel [英] How do I Switch JPanels inside a JFrame

问题描述

关于javas component-stuff 等内容相当绿色，所以如果我提供的信息不够，请见谅！

Quite green regarding javas component-stuff etc so please excuse me if information given by me isn't enough!

考虑下面的代码.添加菜单和菜单显示在框架中，没问题.我想在调用 gameOn() 时删除菜单并开始游戏.下面的代码只使框架表面空白"，没有添加游戏面板.

Considet the code below. Adding menu and menu showing in frame, no problem. I want when gameOn() is called to remove the menu and instead start the game. The code below only makes the Frames surface "blank", no gamepanel added.

关于如何解决它的任何想法/建议?MenuPanel 有一个鼠标监听器.

Any thoughts/suggestions on how to fix it? The MenuPanel has a mouselistener.

public class GameFrame extends JFrame {

private MenuPanel mp; //extends JPanel
private GamePanel gp; //extends JPanel

public GameFrame() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(new Dimension(GameFrame.XSIZE, GameFrame.YSIZE));
    setLocationRelativeTo(null);
    setVisible(true);
    mp = new MenuPanel(this);

    add(mp);
}
public void gameOn() {
    remove(mp);
    GamePanel gp = new GamePanel(5);
    add(gp);
}
}

推荐答案

与其尝试添加移除组件，不如使用 CardLayout

Instead of trying to add an remove components, use a CardLayout

CardLayout cardLayout = new CardLayout();
JPanel mainPanel = new JPanel(cardLayout);

MenuPanel menu = new MenuPanel();
GamePanel game = new GamePanel();
mainPanel.add(menu, "menu");
mainPanel.add(game, "game");

...
public void gameOn() {
    cardLayout.show(mainPanel, "game");
}

当gameOn()被调用时，menu会被推到后面，而game会被推到前面.

When gameOn() is called, the menu will get pushed to the back, and the game to the front.

这样您就不必不断添加和删除

This way you don't have to keep adding and removing

这是您可以运行的示例

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class GameFrame extends JFrame implements ActionListener{

    CardLayout cardLayout;
    JPanel mainPanel;
    MenuPanel menu;
    GamePanel game;

    public GameFrame() {
        cardLayout = new CardLayout();
        mainPanel = new JPanel(cardLayout);
        menu = new MenuPanel();
        game = new GamePanel();
        mainPanel.add(menu, "menu");
        mainPanel.add(game, "game");


        JButton goGame = new JButton("Go TO Game");
        goGame.addActionListener(this);

        add(mainPanel);
        add(goGame, BorderLayout.SOUTH);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setLocationByPlatform(true);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        gameOn();
    }

    public void gameOn() {
        cardLayout.show(mainPanel, "game");
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            @Override
            public void run() {
                GameFrame gameFrame = new GameFrame();
            }
        });
    }
}

class MenuPanel extends JPanel {

    public MenuPanel() {
        setBackground(Color.GREEN);
        add(new JLabel("Menu"));
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(300, 300);
    }
}

class GamePanel extends JPanel {

    public GamePanel() {
        setBackground(Color.BLUE);
        add(new JLabel("Game"));
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(300, 300);
    }
}

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