jLabel slideshow when a mouse enters a button

StackOverflow https://stackoverflow.com/questions/21645026

Question

I can't get this to work:

public void ru() throws InterruptedException {
    jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/adv/room.jpg")));
    setVisible(true);
    Thread.sleep(400);
    jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/adv/ROOMS.jpg")));
    setVisible(true);
    Thread.sleep(400);
    jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/adv/background.jpg")));
    setVisible(true);
}

private void BtnRoomsMouseEntered(java.awt.event.MouseEvent evt) {
    try {
        ru();
    } catch (InterruptedException ex) {
    }
}

Any solutions? I want a jLabel to show a slide show when a mouse enters a certain button and stays like that as long as the mouse is still in a button. If the mouse happens to exit the button, the jlabel will return to a null state. (no more anything.) Is that possible? Please help. I also tried using for statement but no good. I'm using netbeans by the way.

Was it helpful?

Solution

First thing you need to implement a javax.swing.Timer. Trying to call Thread.sleep() will block the Event Dispatch Thread. See How to use Swing Timers. Here is the basic construct

Timer(int delay, ActionListener listener)

where delay is the time in milliseconds you want delayed and the listener will listen for the Timer ActionEvent fired every delay milliseconds.

So you want something like this

public class MyFrame extends javax.swing.JFrame {

   private Timer timer = null;
   ImageIcon[] icons = new ImageIcon[3];
   int index = -1;

   public MyFrame() {
       initComponents();
       icons[0] = new ImageIcon(...);
       icons[1] = new ImageIcon(...);
       icons[2] = new ImageIcon(...);

       timer = new Timer(2000, new ActionListener(){
           public void actionPerformed(ActionEvent e) {
               if (index + 1 > 2) {
                   index = 0;
                   jLabel3.setIcon(icons[index]);
               } else {
                   index++;
                   jLabel3.setIcon(icons[index]);
               }
           }
       });
   }
}

For your button, you need to use mouseEntered and mouseExited, then you can just call timer.start() or timer.stop()

private void jButton1MouseExited(MouseEvent e) {
    timer.stop();
}

private void jButton1MouseEntered(MouseEvent e) {
    timer.start();
}

If you don't know how to add the MouseListener just right click on the button from the design view and select Event -> Mouse -> mouseEntered. Do the same for mouseExited. You should see the above methods auto-generated for you.

UPDATE

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.GroupLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.Timer;
import javax.swing.WindowConstants;

public class ImageViewer extends javax.swing.JFrame {

    private Timer timer = null;
    ImageIcon[] icons = new ImageIcon[5];
    int index = -1;

    public ImageViewer() {
        initComponents();
        try {

            icons[0] = new ImageIcon(new URL("http://www.iconsdb.com/icons/preview/orange/stackoverflow-4-xxl.png"));
            icons[1] = new ImageIcon(new URL("http://www.iconsdb.com/icons/preview/caribbean-blue/stackoverflow-4-xxl.png"));
            icons[2] = new ImageIcon(new URL("http://www.iconsdb.com/icons/preview/royal-blue/stackoverflow-4-xxl.png"));
            icons[3] = new ImageIcon(new URL("http://www.iconsdb.com/icons/preview/moth-green/stackoverflow-4-xxl.png"));
            icons[4] = new ImageIcon(new URL("http://www.iconsdb.com/icons/preview/soylent-red/stackoverflow-4-xxl.png"));
        } catch (MalformedURLException ex) {
            Logger.getLogger(ImageViewer.class.getName()).log(Level.SEVERE, null, ex);
        }

        timer = new Timer(1000, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (index + 1 > 4) {
                    index = 0;
                    jLabel1.setIcon(icons[index]);
                } else {
                    index++;
                    jLabel1.setIcon(icons[index]);
                }
            }
        });
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jButton1 = new JButton();
        jLabel1 = new JLabel();

        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        jButton1.setText("jButton1");
        jButton1.addMouseListener(new MouseAdapter() {
            public void mouseEntered(MouseEvent evt) {
                jButton1MouseEntered(evt);
            }
            public void mouseExited(MouseEvent evt) {
                jButton1MouseExited(evt);
            }
        });

        GroupLayout layout = new GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(GroupLayout.Alignment.LEADING)
            .addGroup(GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addGap(127, 127, 127))
            .addGroup(layout.createSequentialGroup()
                .addGap(27, 27, 27)
                .addComponent(jLabel1, GroupLayout.PREFERRED_SIZE, 285, GroupLayout.PREFERRED_SIZE)
                .addContainerGap(29, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(GroupLayout.Alignment.LEADING)
            .addGroup(GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGap(22, 22, 22)
                .addComponent(jLabel1, GroupLayout.DEFAULT_SIZE, 321, Short.MAX_VALUE)
                .addGap(18, 18, 18)
                .addComponent(jButton1)
                .addGap(16, 16, 16))
        );

        pack();
    }// </editor-fold>                        

    private void jButton1MouseEntered(MouseEvent evt) {                                      
        timer.start();
    }                                     

    private void jButton1MouseExited(MouseEvent evt) {                                     
        timer.stop();
    }                                    

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(ImageViewer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(ImageViewer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(ImageViewer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(ImageViewer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new ImageViewer().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private JButton jButton1;
    private JLabel jLabel1;
    // End of variables declaration                   
}

OTHER TIPS

You want to add a MouseAdapter to the JLabel and use its mouseEntered() and mouseExited() as follows: 

        jLabel3.addMouseListener(new MouseAdapter() {

                   @Override
                   public void mouseEntered(java.awt.event.MouseEvent evt) {      
                   try {
                        jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/adv/room.jpg")));
                        setVisible(true);
                        Thread.sleep(400);
                        jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/adv/ROOMS.jpg")));
                        setVisible(true);
                        Thread.sleep(400);
                        jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/adv/background.jpg")));
                        setVisible(true);
                    } catch(InterruptedException e) {

                    }

                    @Override
                    public void mouseExited(java.awt.event.MouseEvent evt) {
                        //whatever you mean by "null state"
                    }
                });
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