CODEWITHSUNDEEP
javaswingjframejpanel
user3185667
user3185667

Reputation: 51

How do I Switch JPanels inside a JFrame

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

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.

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);
}
}

Upvotes: 1

Views: 1673

Answers (3)

Paul Samsotha
Paul Samsotha

Reputation: 208944

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");
}

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

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

Here's an example you can run

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);
    }
}

Upvotes: 6

TroyAndAbed
TroyAndAbed

Reputation: 301

After adding the GamePanel, do validate();

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

}

Upvotes: 1

Ross Drew
Ross Drew

Reputation: 8246

You'll need to repaint() after you remove one panel and add another, setVisible(true) should be done after you've added your componen ts to the frame and I recommend doing heavy UI changes like that on the EDT thread to avoid interference.

Upvotes: 0

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