CODEWITHSUNDEEP
javaswingactionlistenerjmenu
clankfan1
clankfan1

Reputation: 225

JMenu ActionListener

I was wondering if can you test to see if a JMenu (not JMenuItem) has been clicked. I tried adding an ActionListener to it but it doesn't seem to recognize it. I just need it to preform an action when the JMenu button is pressed so that I can change the JMenuItems for that menu befor it opens. All work arrounds to get this result are welcome too!

Thanks

Upvotes: 16

Views: 39363

Answers (3)

Michael
Michael

Reputation: 141

I think it's possible to use a MouseListener to fire actions in JMenu without JMenuItem.

JMenu myMenu = new JMenu("My menu");

myMenu.addMouseListener(new MouseListener() {
  @Override
  public void mouseClicked(MouseEvent e) {
    // action here
  }

  @Override
  public void mousePressed(MouseEvent e) {
  }

  @Override
  public void mouseReleased(MouseEvent e) {
  }

  @Override
  public void mouseEntered(MouseEvent e) {
  }

  @Override
  public void mouseExited(MouseEvent e) {
  }
});

menuBar.add(myMenu);

Upvotes: 0

Antonio1996
Antonio1996

Reputation: 756

With an instance of JMenu you can't add an ActionListener, only with JMenuItem you can do it.

Upvotes: -1

mKorbel
mKorbel

Reputation: 109815

  • for JMenu use MenuListener

code

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

public class ActionExample {

    public ActionExample() {

        JMenu menu = new JMenu("Menu");
        menu.setMnemonic(KeyEvent.VK_M);
        menu.addMenuListener(new SampleMenuListener());
        JMenu menu1 = new JMenu("Tool");
        menu1.setMnemonic(KeyEvent.VK_T);
        menu1.addMenuListener(new SampleMenuListener());
        JFrame f = new JFrame("ActionExample");
        JMenuBar mb = new JMenuBar();
        mb.add(menu);
        mb.add(menu1);
        f.setJMenuBar(mb);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                ActionExample actionExample = new ActionExample();
            }
        });
    }
}

class SampleMenuListener implements MenuListener {

    @Override
    public void menuSelected(MenuEvent e) {
        System.out.println("menuSelected");
    }

    @Override
    public void menuDeselected(MenuEvent e) {
        System.out.println("menuDeselected");
    }

    @Override
    public void menuCanceled(MenuEvent e) {
        System.out.println("menuCanceled");
    }
}

Upvotes: 21

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