Member Avatar for Petranilla

Hi Everyone,

I have a project that requires to use mouse right click. Upon right click, it should display a list of categories(drop down). How Do I do I use right click?

Many thanks,

Petra

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For Swing, do not rely on mouseClicked or testing for button 3 to show a context menu. The portable trigger for a popup menu is e.isPopupTrigger(), and it may fire on mousePressed on some platforms and mouseReleased on others (e.g., Windows). Handle both to ensure it always works, including Ctrl+click on macOS.

Example:

JPopupMenu popup = buildPopup(); // create and populate your JPopupMenu

MouseAdapter popupListener = new MouseAdapter() {
    private void maybeShow(MouseEvent e) {
        if (e.isPopupTrigger()) {
            popup.show(e.getComponent(), e.getX(), e.getY());
        }
    }
    @Override public void mousePressed(MouseEvent e)  { maybeShow(e); }
    @Override public void mouseReleased(MouseEvent e) { maybeShow(e); }
};
targetComponent.addMouseListener(popupListener);

Alternatively, since Java 6 you can simply call targetComponent.setComponentPopupMenu(popup) and skip a custom listener; Swing will manage the cross-platform trigger for you.

If switching from a JMenuBar to a JPopupMenu and the popup does not appear:

  • Attach the popup to the component actually receiving the right-click (often the content pane or the specific widget), not the menu bar.
  • Do not mix setComponentPopupMenu(...) with separate manual show(...) logic on the same component unless you have a reason; pick one approach.
  • Ensure the component is enabled and not obscured by a glass pane or modal dialog.

See Oracle’s guides: Bringing up a popup menu and How to write a Mouse Listener.

Recommended Answers

All 5 Replies

Member Avatar for mKorbel

  • add MouseListener to container (JPanel???)

  • override public void mouseClicked(MouseEvent e) { then there are two ways

    panel.addMouseListener(new MouseAdapter() {

    @Override
    public void mouseClicked(MouseEvent e) {
        if (e.getModifiers() == MouseEvent.BUTTON3_MASK && e.getClickCount() == 1) {
            // whatever
        }
    }
});

    or

        panel.addMouseListener(new MouseAdapter() {

        @Override
        public void mouseClicked(MouseEvent e) {
             if (SwingUtilities.isRightMouseButton(e) && e.getClickCount() == 1) {
                // whatever
            }
        }
    });
Member Avatar for jalpesh_007

i think you have to use mouseadapter class and then you have to use mouseclicked event to handle right click of mouse.

Member Avatar for Lucaci Andrew

Here's a small example. You can use the getButton() function from MouseEvent.

final JLabel lblRightClickMe = new JLabel("Right click me");        //create a label
lblRightClickMe.setBounds(152, 119, 94, 14);
final JPopupMenu jpm = new JPopupMenu("Hello");                     //create a JPopupMenu
jpm.add("Right");jpm.add("Clicked");jpm.add("On");                  //add some elements
jpm.add("This");jpm.add("Label");
lblRightClickMe.setComponentPopupMenu(jpm);                         //set jpm as this label's popup menu

lblRightClickMe.addMouseListener(new MouseAdapter() {
    @Override
    public void mouseClicked(MouseEvent arg0) { 
        if (arg0.getButton() == MouseEvent.BUTTON3){                //get the mouse button
            jpm.show(arg0.getComponent(), arg0.getX(), arg0.getY());//set the position and show the popup menu
        }
    }
});
Edited by Lucaci Andrew
Member Avatar for Petranilla

Many thanks to all, I shall do your suggestions.

Member Avatar for Petranilla

My popup menu works now. My standard menu as well. But when I switch from standard JMenu to JPopupMenu, it doesnt display my pop up menu. How? Many thanks.

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