Schalttafeln in einem JFrame

Question

Ich habe 2 JPanels und 1 JFrame, und ich versuche, zwischen Panels zu wechseln, wenn ich eine Schaltfläche klicken. Ich möchte nicht CardLayout verwenden, weil ich verschiedene Panels will und mit CardLayouts kann ich nur die gleiche Schaltfläche für beide haben. Mein Code ist:

package javaapplication2;

import javax.swing.JPanel;

public class NewJFrame extends javax.swing.JFrame {
/**
 * Creates new form NewJFrame
 */JPanel panel1 = new JPanel();
 JPanel panel2 = new JPanel();
public NewJFrame() {
    initComponents();
}

private void initComponents() {

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    setBackground(new java.awt.Color(121, 183, 60));
    setSize(200, 300);
    setResizable(false);

    /**panel1**/
     jButton1 = new javax.swing.JButton();

    jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
        public void mouseClicked(java.awt.event.MouseEvent evt) {
            jButton1MouseClicked(evt);
        }
    });
    jButton1.setText("jButton1");
     panel1.setBackground(new java.awt.Color(121, 183, 60));
    panel1.setMaximumSize(new java.awt.Dimension(100, 200));
    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(panel1);
    panel1.setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(164, 164, 164)
            .addComponent(jButton1)
            .addContainerGap(172, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(115, 115, 115)
            .addComponent(jButton1)
            .addContainerGap(158, Short.MAX_VALUE))
    );

    /**panel2**/

       jButton2 = new javax.swing.JButton();

    jButton2.addMouseListener(new java.awt.event.MouseAdapter() {
        public void mouseClicked(java.awt.event.MouseEvent evt) {
            jButton2MouseClicked(evt);
        }
    });
    jButton2.setText("jButton2");
     panel2.setBackground(new java.awt.Color(101, 13, 61));
    panel2.setMaximumSize(new java.awt.Dimension(100, 200));
    javax.swing.GroupLayout layout2 = new javax.swing.GroupLayout(panel2);
    panel2.setLayout(layout2);
    layout2.setHorizontalGroup(
        layout2.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout2.createSequentialGroup()
            .addGap(164, 164, 164)
            .addComponent(jButton2)
            .addContainerGap(172, Short.MAX_VALUE))
    );
    layout2.setVerticalGroup(
        layout2.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout2.createSequentialGroup()
            .addGap(115, 115, 115)
            .addComponent(jButton2)
            .addContainerGap(158, Short.MAX_VALUE))
    );
   add(panel2);
    pack();
}

public void changePanel(){
    getContentPane().removeAll();
    add(panel1);
    invalidate();
    repaint();
}

private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
    changePanel();
}
 private void jButton2MouseClicked(java.awt.event.MouseEvent evt) {
    changePanel();
}

private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;

}

Answer 1

Hier ist ein kleines Beispiel für Ihre Hilfe:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class CardLayoutExample
{
    private JPanel contentPane;
    private MyPanel panel1;
    private MyPanel2 panel2;

    private void displayGUI()
    {
        JFrame frame = new JFrame("Card Layout Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel contentPane = new JPanel();
        contentPane.setBorder(
            BorderFactory.createEmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new CardLayout());
        panel1 = new MyPanel(contentPane);
        panel2 = new MyPanel2(contentPane);
        contentPane.add(panel1, "Panel 1"); 
        contentPane.add(panel2, "Panel 2");
        frame.setContentPane(contentPane);
        frame.pack();   
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                new CardLayoutExample().displayGUI();
            }
        });
    }
}

class MyPanel extends JPanel 
{
    private JButton jcomp4;
    private JPanel contentPane;

    public MyPanel(JPanel panel) 
    {
        contentPane = panel;
        setOpaque(true);
        setBackground(Color.RED.darker().darker());
        //construct components
        jcomp4 = new JButton ("openNewWindow");
        jcomp4.addActionListener( new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                CardLayout cardLayout = (CardLayout) contentPane.getLayout();
                cardLayout.next(contentPane);
            }
        });
        add(jcomp4);
    }

    @Override
    public Dimension getPreferredSize()
    {
        return (new Dimension(500, 500));
    }
}

class MyPanel2 extends JPanel 
{

    private JButton jcomp1;
    private JPanel contentPane;

    public MyPanel2(JPanel panel) 
    {   
        contentPane = panel;

        setOpaque(true);
        setBackground(Color.GREEN.darker().darker());

        //construct components
        jcomp1 = new JButton ("Back");
        jcomp1.addActionListener( new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                CardLayout cardLayout = (CardLayout) contentPane.getLayout();
                cardLayout.next(contentPane);
            }
        });

        add(jcomp1);
    }

    @Override
    public Dimension getPreferredSize()
    {
        return (new Dimension(500, 500));
    }
}

NEUESTE BEARBEITUNG

anzeigen JPanel Ihrer Wahl, innen CardLayout

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class CardLayoutExample
{
    private JPanel contentPane;
    private MyPanel panel1;
    private MyPanel2 panel2;
    private MyPanel2 panel3;
    private JComboBox choiceBox;
    private String[] choices = {
                                "Panel 1",
                                "Panel 2",
                                "Panel 3"
                               };

    private void displayGUI()
    {
        JFrame frame = new JFrame("Card Layout Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel contentPane = new JPanel();
        contentPane.setBorder(
            BorderFactory.createEmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new CardLayout());

        choiceBox = new JComboBox(choices);        

        panel1 = new MyPanel(contentPane, this);
        panel2 = new MyPanel2(contentPane
                , Color.GREEN.darker().darker(), this);
        panel3 = new MyPanel2(contentPane
                , Color.DARK_GRAY, this);   

        contentPane.add(panel1, "Panel 1"); 
        contentPane.add(panel2, "Panel 2");
        contentPane.add(panel3, "Panel 3");         

        frame.getContentPane().add(choiceBox, BorderLayout.PAGE_START);
        frame.getContentPane().add(contentPane, BorderLayout.CENTER);       
        frame.pack();   
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public JComboBox getChoiceBox()
    {
        return choiceBox;
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                new CardLayoutExample().displayGUI();
            }
        });
    }
}

class MyPanel extends JPanel 
{
    private JButton jcomp4;
    private JPanel contentPane;
    private JComboBox choiceBox;

    public MyPanel(JPanel panel, CardLayoutExample cle) 
    {
        choiceBox = cle.getChoiceBox();
        contentPane = panel;
        setOpaque(true);
        setBackground(Color.RED.darker().darker());
        //construct components
        jcomp4 = new JButton ("Show New Panel");
        jcomp4.addActionListener( new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                String changeToPanel = (String) choiceBox.getSelectedItem();
                CardLayout cardLayout = (CardLayout) contentPane.getLayout();
                cardLayout.show(contentPane, changeToPanel);
            }
        });
        add(jcomp4);
    }

    @Override
    public Dimension getPreferredSize()
    {
        return (new Dimension(500, 500));
    }
}

class MyPanel2 extends JPanel 
{

    private JButton jcomp1;
    private JPanel contentPane;
    private Color backgroundColour;
    private JComboBox choiceBox;

    public MyPanel2(JPanel panel, Color c, CardLayoutExample cle) 
    {   
        contentPane = panel;
        backgroundColour = c;
        choiceBox = cle.getChoiceBox();

        setOpaque(true);
        setBackground(backgroundColour);

        //construct components
        jcomp1 = new JButton ("Show New Panel");
        jcomp1.addActionListener( new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                String changeToPanel = (String) choiceBox.getSelectedItem();
                CardLayout cardLayout = (CardLayout) contentPane.getLayout();
                cardLayout.show(contentPane, changeToPanel);
            }
        });

        add(jcomp1);
    }

    @Override
    public Dimension getPreferredSize()
    {
        return (new Dimension(500, 500));
    }
}