Java, swt, How to distinguish right-click from left-click on popup menu

Question

How can I distinguish right-click from left-click on popup menu in swt?

By adding a SelectionListener I can act on both left and right-click, but how do I know which one was used? Is it possible to have a MouseListener on a MenuItem?

What I want to do is similar to a browser-favorites menu, left-click to select and right-click for a favorite context menu.

Button bn = new Button(shell, SWT.FLAT);
bn.setText("Right Click to see the popup menu");

Menu popupMenu = new Menu(bn);
MenuItem newItem = new MenuItem(popupMenu, SWT.CASCADE);
newItem.setText("New");

newItem.addSelectionListener(new SelectionListener() {
 public void widgetSelected(SelectionEvent e) {    
      System.out.print("SELECTED1\n" );
 }
 public void widgetDefaultSelected(SelectionEvent e) {
      System.out.print("SELECTED2\n" );
 }
});

To clarify: Sorry, did not manage to include a screen shot, but I think you can see what I mean if you follow this description.

1. Select the Favorites menu in Windows Explorer (or probably any other browser)
2. If you left-click on one of your favorites the browser will open this URL, but you may also Right-click on this favorite.
3. Right-click will bring up a context menu valid for the selected favorite.

I also need two different actions for the same MenuItem (actually for the same purpose as the browser).

Answer 1

You can listen for SWT.Selection for the left click and SWT.MenuDetect for the right click:

public static void main(String[] args)
{
    Display display = new Display();
    Shell shell = new Shell();
    shell.setText("StackOverflow");
    shell.setLayout(new FillLayout());

    Button bn = new Button(shell, SWT.FLAT);
    bn.setText("Right Click to see the popup menu");

    Menu popupMenu = new Menu(bn);
    MenuItem newItem = new MenuItem(popupMenu, SWT.CASCADE);
    newItem.setText("New");

    bn.addListener(SWT.Selection, new Listener()
    {
        @Override
        public void handleEvent(Event e)
        {
            System.out.println("click");
        }
    });
    bn.addListener(SWT.MenuDetect, new Listener()
    {
        @Override
        public void handleEvent(Event e)
        {
            System.out.println("menu");
        }
    });
    bn.setMenu(popupMenu);

    shell.pack();
    shell.open();

    while (!shell.isDisposed())
    {
        if (!display.readAndDispatch())
        {
            display.sleep();
        }
    }
    display.dispose();
}

That said, for the menu you don't need the SWT.MenuDetect listener. Just calling Button#setMenu(Menu) does the job just fine.