Question

I’ve inserted a JMenu (instance named: exitMenu) without any JMenuItem, so my intention is to make available a way to EXIT the program without access unnecessary menu items, since my program has just one JMenu object (Someone might says: WTF!!! but…).

Thus, to capture the event occurred in this specific JMenu component, my class implements the MenuListener interface. As everybody knows, there are three mandatory implementation methods, although I need to use just one, the menuSelected() method.

To make my program a little bit intuitive, undoubtedly, once the user selects the exitMenu, the (in)famous popup JOptionPane.showConfirmDialog() presents itself where he/she needs to choose between the YES or NO option.

If the chosen option is YES, no problem at all, since the program is finished through System.exit(0). The problem is the NO option, when the focus returns to the program, the exitMenu remains selected, off course, since I’ve selected previously. The “thing” I’d like to do is to remove the object selection right after the NO option is chosen, so the user’ll be able to click on it again.

Even using exitMenu.setSelected(false) within the three mandatory methods (one calling another), although exitMenu component is “deselected” it’s necessary to click on it twice to call its event listener.

Any suggestion?

Thanks in advance.

Answer 1

One thing I attempted is to simply call setSelected(false) from within the menuSelected(…) method, but this has side effects. For one, the menu doesn’t appear to be selected, and for another, it doesn’t work all the time.

One possible solution that does work is to deselect the menu in a Swing Timer. Something like:

     @Override
     public void menuSelected(MenuEvent mEvt) {
        // show JOptionPane
        // if yes selected, exit. 

        // Otherwise...
        final JMenu menu = (JMenu) mEvt.getSource();
        new Timer(200, new ActionListener() {

           @Override
           public void actionPerformed(ActionEvent e) {
              menu.setSelected(false);
              ((Timer)e.getSource()).stop();
           }
        }).start();
     }