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masking the right click functionality in JMenu

Posted on 2001-06-11
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Last Modified: 2010-05-18
How do i hide the poping up of menutiems when i rightclick a JMenu which should occur only with the leftclick?
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Question by:YamunaiThuraivan
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Expert Comment

by:superschlonz
ID: 6178438
subclass it and catch the MouseEvent if its the right button.
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Expert Comment

by:Ovi
ID: 6180390
subclass the JMenu and your JMenuItems and overwrite the portected void processMouseEvent(MouseEvent me) method to disallow right click. Im this method you should get a 'true' value for a call to me.isPopupTrigger() method;

If doesn't work with me.isPopupTrigger() method, you should test the which mouse button was presses and if is the right one just return. (All this in the same processMouseEvent method). If you don't overwrite'it will be called with the default implementation.
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Accepted Solution

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Ovi earned 50 total points
ID: 6180470
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

//Disabling the right click on a popup item

public class Popup extends JFrame {
     JMenuBar bar;
 
     public Popup() {
          init();
     }
     
     private void init() {
          getContentPane().setLayout(new BorderLayout());
          setSize(400, 300);
          setLocation(300, 100);
    bar = new JMenuBar();
   
    MyMenu menu = new MyMenu("File");
    menu.add(new JMenuItem("Open"));
          menu.add(new JMenuItem("Save"));
    bar.add(menu);
   
          menu = new MyMenu("Edit");
    menu.add(new JMenuItem("Copy"));
          menu.add(new JMenuItem("Paste"));
    bar.add(menu);    
          menu = new MyMenu("Tools");
          menu.add(new JMenuItem("Tool1"));
          menu.add(new JMenuItem("Tool2"));
          bar.add(menu);    
          menu = new MyMenu("Help");
          menu.add(new JMenuItem("Help"));
          menu.add(new JMenuItem("About"));
          bar.add(menu);    
    setJMenuBar(bar);
          setVisible(true);
     }
     
  class MyMenu extends JMenu {  
       public MyMenu(String name) {
            super(name);
       }
   
       protected void processMouseEvent(MouseEvent me) {
      int modifiers = me.getModifiers();
         if(me.getID() == MouseEvent.MOUSE_PRESSED)  {
           if(modifiers == MouseEvent.BUTTON3_MASK)
             return;
         }
     
            super.processMouseEvent(me);
       }
  }
 
     public static void main(String[] args) {
          Popup t = new Popup();    
     }
     
}
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Expert Comment

by:Ovi
ID: 6180487
The problem is that the menu is showed on a mousePressed event and the isPopupTrigger() method is true on a mouseReleased event. This is the case of Windows. From what I know in Linux is the reverse order. So the complete code for the method to avoid platform problems is :

       protected void processMouseEvent(MouseEvent me) {
      int modifiers = me.getModifiers();
         if(me.getID() == MouseEvent.MOUSE_PRESSED || me.getID() == MouseEvent.MOUSE_RELEASED)  {
           if(modifiers == MouseEvent.BUTTON3_MASK)
             return;
         }
     
            super.processMouseEvent(me);
       }

I've tested my self and is working. If you have submenus on the File menu for example, you must do the same thing as subclassing the JMenuItem class and overwriting the same method.
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Author Comment

by:YamunaiThuraivan
ID: 6185109
good answer
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Expert Comment

by:Ovi
ID: 6185115
Thanks, hope is what you want?
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by:Ovi
ID: 6185357
so ... are you gonna accept the answear ?
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Expert Comment

by:Ovi
ID: 6190387
Thank you very much for that BBBBBBBBBBBBBBBBBBBBBB. DID YOU HAVE ANY PROBLEMS WITH THE CODE ?
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