addActionListener on panel. How to map to main frame?

Question

I have 2 panel (2 class, extends from JPanel), 1 frame (1 class, extends from JFrame)

My first panel - WelcomePanel:

package caro;

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.JOptionPane;
import javax.swing.JPanel;

public class WelcomePanel extends JPanel {

    public WelcomePanel() {

        ImageIcon logoImage = new ImageIcon("/home/khanhpq/logo.png");
        JButton playButton = new JButton("Play");
        JButton exitButton = new JButton("Exit");

        JLabel imageLabel = new JLabel(logoImage);

        add(imageLabel);
        add(playButton);
        add(exitButton);

        playButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {



            }
        });

        exitButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                int option = JOptionPane.showConfirmDialog(null, "Are you sure ?", "Warning", JOptionPane.YES_NO_OPTION);               
                if(option == JOptionPane.YES_OPTION) {
                    System.exit(0);
                }
            }
        });

    }

}

My second panel - BoardPanel:

package caro;

import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JPanel;

public class BoardPanel extends JPanel {    

    public BoardPanel() {

        JPanel boardPanel = new JPanel();

        Board board = new Board();

        CellButton cellButton[] = new CellButton[144];

        GridLayout gridLayout = new GridLayout(12, 12);     
        boardPanel.setLayout(gridLayout);       

        for (int i = 0; i < 144; i++) {         
                cellButton[i] = new CellButton();               
                boardPanel.add(cellButton[i]);              
        }

    }

}

My main frame - MainFrame

package caro;

import javax.swing.JFrame;

public class MainFrame extends JFrame {

    public MainFrame() {
        add(new WelcomePanel());
        setSize(360, 380);
        setVisible(true);

    }

    public static void main(String[] args) {
        MainFrame startFrame = new MainFrame();
    }

}

My question: Help me write code, addActionListener on buttons of panels (material example). When i press play button (of WelcomePanel), WelcomePanel is hidden and BoardPanel is show. And, when i exit BoardPanel (close button is pressed, or click x button), WelcomePanel is showed. My friend recommend use Message and Handle, but I don't know. Please help me. Thanks.

1) For many components in one space, use a CardLayout as seen in this short example. 2) Don't extend frame or other top level containers. Instead create & use an instance of one. The same for JPanel in this case, the code is not changing or adding functionality to the panel, so just use (2x) an instance JPanel. — Andrew Thompson

Ezequiel Ezequiel · Accepted Answer · 2013-07-27T23:18:08

Its better to declare dependencies (Component like buttons, panels, etc...) as fields. In this way they are visible for a third class that is the Controller of them. In next examaple I make MainFrame controlling itself, just an example. Read about Presentation patterns for better pratices.

WelcomePanel.java

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class WelcomePanel extends JPanel {

    /* Declare your dependecies as fields,
     * so you can hold a reference.
     */
    ImageIcon logoImage;
    JButton playButton;
    JButton exitButton;
    JLabel imageLabel;

    public WelcomePanel() {

        logoImage = new ImageIcon("/home/khanhpq/logo.png");
        playButton = new JButton("Play");
        exitButton = new JButton("Exit");
        imageLabel = new JLabel(logoImage);

        add(imageLabel);
        add(playButton);
        add(exitButton);

    }

}

BoardPanel.java

import javax.swing.JButton;
import javax.swing.JPanel;

public class BoardPanel extends JPanel {

    /* Declare your dependecies as fields,
     * so you can hold a reference.
     */
    JButton closeButton;

    public BoardPanel() {
        closeButton = new JButton();
        add(closeButton);

    }
}

MainFrame.java

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class MainFrame extends JFrame implements ActionListener {

    /* Declare your dependecies as fields,
     * so you can hold a reference.
     */
    WelcomePanel welcomePanel;
    BoardPanel boardPanel;

    public MainFrame() {
        welcomePanel = new WelcomePanel();
        boardPanel = new BoardPanel();

        add(welcomePanel);
        add(boardPanel);

        boardPanel.setVisible(false);

        boardPanel.closeButton.addActionListener(this);
        welcomePanel.playButton.addActionListener(this);

        setSize(360, 380);
    }

    /**
     * This class is the controller.
     */
    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource().equals(boardPanel.closeButton)) {
            welcomePanel.setVisible(false);
            boardPanel.setVisible(true);
        } else if (e.getSource().equals(welcomePanel.playButton)) {
            welcomePanel.setVisible(true);
            boardPanel.setVisible(false);
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                MainFrame startFrame = new MainFrame();
                startFrame.setVisible(true);

            }
        });
    }
}

addActionListener on panel. How to map to main frame?

1 Answers