Thread: Changing from a screen to another!

Sounds like a job for CardLayout!

You can keep JPanels in memory and switch them when you want to.

Originally Posted by codesmuggler

You can keep JPanels in memory and switch them when you want to.

Or you can have CardLayout do that for you.

Originally Posted by Mr.777

You can place one button on both screens. By pressing that button, hide the current screen and open up the other one.

That's what the OP is asking how to do. The answer is to use CardLayout.

Originally Posted by gargamel7

Every tutorial I´ve found about CardLayout just demonstrates its use within one class that has some JPanels set up there. I don´t get how I do to integrate my room-objects with CardLayout. Please Help!

I don't know what your Room Objects are, so I can't really help you. But the general idea is that you'd have one main class that sets up the CardLayout, and from there you'd instantiate whatever other classes you want and add their JPanels to the CardLayout.

If you don't want to hide the other rooms while the program is running, then a TabbedPane is a good solution, too.

Originally Posted by gargamel7

The room-objects are a menu class and a game class, both are extending JPanel.


In the Menu-room there are a go-button (think of the go-button as a JPanel). I need to add this JPanel called p to the Main class or else it won´t work to click the go-button, how do I add it?

The code you have seems to add it just fine. What isn't working, exactly?

Originally Posted by gargamel7

And should I instantiate it like this:
Menu menu = new Menu();

or like this:

JPanel menu = new Menu();

?

What happened when you tried both?

Originally Posted by gargamel7

Here is the Main-class:

Althought that's not an SSCCE, it does seem reasonable to me. What's your question now?

The code you have seems to add it just fine. What isn't working, exactly?

The code combiles without errors so it´s working, but it isn´t done. I wanted to know if everything was correctly done, and not full of code-bits that was unnecessary.

Now my next question is how to add the JPanel p (which enables clicking the go-nutton in the menu). I thought that it would be best to add it in the menu class but I couldn´t make it work, so I added add(menu.p); in the constructor of main class.

public Main(){
Menu menu = new Menu(this);
Game game = new Game();
cardPanel = new JPanel();

add(menu.p);
setTitle("SpaceBanana");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(BOARD_WIDTH, BOARD_HEIGTH);
setLocationRelativeTo(null);
setVisible(true);
setResizable(false);

cl = new CardLayout();
cardPanel.setLayout(cl);



cardPanel.add(menu, "menuscreen");
cardPanel.add(game, "gamescreen");



getContentPane().add(cardPanel);


}

So now it works to click the button but I would like to add the JPanel p right into the menu class itself, since it seems to be the best choice.

Here is the menu class (in which I´ve tried to add p):

import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
 
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
 
 
 
public class Menu extends Screen implements ActionListener, MouseListener, Commons{
 
	public static int points = 0;
	public int xMouse;
	public int yMouse;
    private Timer timer;
    private Image image;
    private String backMenu = "backMenu.png";
    private Go go;
    private Logo logo;
    JPanel p = new JPanel();
    public Main main;
 
 
 
 
	public Menu(Main main){
 
		this.main = main;
 
        timer = new Timer(5, this);
        timer.start();
 
        ImageIcon ii = new ImageIcon(getClass().getResource(backMenu));
		image = ii.getImage();
		go = new Go();
		logo = new Logo();
		setVisible(true);
		add(p);
 
		p.addMouseListener(this);
	    p.setVisible(true);
 
 
 
 
 
	}
 
	public void paint(Graphics g) {
 
	    super.paint(g);
	    drawBackGame(g);
	    drawOther(g);
 
	}
 
 
	public void drawBackGame(Graphics g) {
		g.drawImage(image,0,0, this);	
	}
 
	public void drawOther(Graphics g) {
		g.drawImage(go.getImage(),go.getX(),go.getY(), this);
		g.drawImage(logo.getImage(),logo.getX(),logo.getY(), this);
	}
 
	public void actionPerformed(ActionEvent e) {
	    repaint();;
	}
 
	@Override
	public void mouseClicked(MouseEvent e) {
		if ((e.getX() > go.getX()) && (e.getX() < go.getX()+go.getWidth())){
		if ((e.getY() > go.getY()) && (e.getY() < go.getY()+go.getHeight()))
 
		{
			main.change();
 
 
 
		}
		}
 
 
	}
 
	@Override
	public void mouseEntered(MouseEvent arg0) {
		// TODO Auto-generated method stub
 
	}
 
	@Override
	public void mouseExited(MouseEvent arg0) {
		// TODO Auto-generated method stub
 
	}
 
	@Override
	public void mousePressed(MouseEvent arg0) {
		// TODO Auto-generated method stub
 
	}
 
	@Override
	public void mouseReleased(MouseEvent arg0) {
		// TODO Auto-generated method stub
 
	}
 
 
}

What happened when you tried both?

The only difference i could catch was that when using "JPanel menu = new Menu()" instead of "Menu menu = new Menu();" was that I couldn´t add "add(menu.p);.

Althought that's not an SSCCE, it does seem reasonable to me. What's your question now?

How do I add p in the right way so that the change() can be called and how do I switch screens using the CardLayout ( is this really enough: cl.show(cardPanel, "" + game); )?

And, when I add p through add(menu.p); in the main class and the application is running and I click on the go-button, only the println is executed of:

public void change() {
		System.out.println("fd");
		cl.show(cardPanel, "" + game);
	}

No screen is changing at least!

Thankful for an answer!

JPanel cards are shown by Strings. Each JPanel has to have a unique String identifier (that can be "panel1", "panel2", or "startPanel", "gamePanel", etc, whatever you want). I'm not sure what you're doing by trying to add the JPanel to the String.

If you want more help, you'll have to post an SSCCE and get rid of all that extra stuff. Just a program that has two JPanels that you can switch back and forth between. No painting code or game logic. Follow the tutorial I gave you.

Ah, sorry if I didn't post it before, but it's the first result for googling "Java CardLayout": How to Use CardLayout (The Java™ Tutorials > Creating a GUI With JFC/Swing > Laying Out Components Within a Container)

Hmm I'm not sure without seeing the SSCCE. You could try calling requestFocusInWindow() on the JPanel in question. Does it work without the CardLayout, if you just add it to another JPanel directly? Does it work if you start it out as the default visible card?

Nothing happened when adding requestFocusInWindow() in the game-class-constructor. Yes it works without the CardLayout and yes, it works as the default visible card.

Here´s the game-class. It´s modified though, I deleted everything irrelevant.

import a lot of stuff
 
public class Game extends Screen implements ActionListener, Commons{
 
	public static int points = 0;
    private Timer timer;
    private Banana banana;
    private Player player;
    private Apple apple;
    private Image image;
    private String backGame = "backGame.png";
    private ArrayList apples;
 
 
	public Game(){
        addKeyListener(new TAdapter());
        setFocusable(true);
        player = new Player();
        apple = new Apple(-500,0);
        banana = new Banana();
        timer = new Timer(5, this);
        timer.start();
 
        ImageIcon ii = new ImageIcon(getClass().getResource(backGame));
	image = ii.getImage();
	}
 
 
 
	public void actionPerformed(ActionEvent e) {
	    Player.move();
	    repaint();
	    bort();
	    checkCollisions();
	}
 
 
 
	private class TAdapter extends KeyAdapter {
 
 
        public void keyReleased(KeyEvent e) {
            player.keyReleased(e);
        }
 
        public void keyPressed(KeyEvent e) {
            player.keyPressed(e);
        }
    }
 
}

Originally Posted by gargamel7

Thanks for the tips Spidey! Actually, I have fixed the screen-switching issue. The thing left is that the game-room don´t listen to user inputs. Anyone who may know what the problem is?

If you post an SSCCE, I'll play around with it. The code you posted contains classes that I don't have, which might be irrelevant to the problem anyway.

Here´s an SSCCE:
http://www.filedropper.com/spacesscce

Thanks for helping!

Originally Posted by gargamel7

Here´s an SSCCE:
http://www.filedropper.com/spacesscce

Thanks for helping!

An SSCCE should be something you can copy and paste into (and out of) the forums. A lot of people (myself included) are accessing the site from work or school, so they might be behind a firewall that blocks sites like that.