Name: sv35042 Date: 10/08/2002


FULL PRODUCT VERSION :
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

FULL OPERATING SYSTEM VERSION :Microsoft Windows 2000
[Version 5.00.2195]


ADDITIONAL OPERATING SYSTEMS :
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.




A DESCRIPTION OF THE PROBLEM :
On Windows, you can select a JMenuItem either by clicking
on the menu and then separately clicking on the menu item
or by clicking on the menu and then dragging the mouse and
releasing it over the menu item.

If you wish to use a JMenuItem both in a standard menu and
a pop-up menu, then according to:

http://forum.java.sun.com/thread.jsp?forum=257&thread=118085

you need to add a menu listener to prevent the items on the
standard menu from disappearing when the pop-up menu is
first selected.

We have done this in our application, and have discovered
that when this code is added, you can no longer select
JMenuItems on the standard menu by clicking separately on
the menu and then the menu item; you can only select it by
clicking on the menu and then dragging the mouse and
releasing it over the menu item.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Compile and run the test case provided in the box below.
2. Select one of the menu items by clicking on the "Test"
menu, dragging the mouse to the menu item and releasing the
mouse button. You should see a message appended to the text
area.
3. Now select one of the menu items by clicking on
the "Test" menu and then clicking on the menu item. No
message is appended to the text area, indicating that the
ActionListener associated with that item has not been
called.
4. To see that this works without the popup menu, comment
out the two lines:

menu.addMenuListener(new PopupWorkaround());
ta.addMouseListener(new PopupDisplayer(menu));

and recompile. Now repeat steps 2 and 3 - in both cases, a
message should be appended to the text area.

EXPECTED VERSUS ACTUAL BEHAVIOR :
Expected results:
A message is appended to the text area to indicate that the
menu item has been selected whether you click the menu and
menu item separately or drag from one to the other.
Actual results:
When the popup menu is included, a message only appears if
you drag from the menu to the menu item, not if you click
the menu and menu item separately.

This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class JMenuTest extends JFrame {

    public static void main(String [] args) {
new JMenuTest().show();
    }

    public JMenuTest (){
super("JMenuTest");

Container contentPane = getContentPane();
contentPane.setLayout(new BorderLayout());

final JTextArea ta = new JTextArea(30, 50);
contentPane.add(BorderLayout.CENTER, ta);

JMenuBar mb = new JMenuBar();
setJMenuBar(mb);
JMenu menu = new JMenu("Test");
mb.add(menu);
JMenuItem menuItem = new JMenuItem("Test 1");
menuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
ta.append("Test 1 called\n");
}
});
menu.add(menuItem);
menuItem = new JMenuItem("Test 2");
menuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
ta.append("Test 2 called\n");
}
});
menu.add(menuItem);

//If you comment out these two lines, so there's no popup menu,
//the menubar menu works.
menu.addMenuListener(new PopupWorkaround());
ta.addMouseListener(new PopupDisplayer(menu));

setDefaultCloseOperation(EXIT_ON_CLOSE);

pack();
    }

    /**
     * By adding this menu listener to a menu that you wish to act as both a
pull-down
     * and popup menu, this gets around a bug in the JDK that prevents your
pull-down
     * menu appearing once the popup menu has been used.
     * See http://forum.java.sun.com/thread.jsp?forum=257&thread=118085
     */
    public class PopupWorkaround implements MenuListener {
public void menuSelected(MenuEvent e) {
JMenu menu = (JMenu)e.getSource();
menu.setPopupMenuVisible(true);
}

public void menuDeselected(MenuEvent e) {}

public void menuCanceled(MenuEvent e) {}
    }

    /**
     * A mouse listener used to add a popup menu to a component.
     */
    public class PopupDisplayer extends MouseAdapter {
private JMenu menu;

public PopupDisplayer(JMenu menu) {
this.menu = menu;
}

public void mousePressed(MouseEvent e) {
maybeShowPopup(e);
}

public void mouseReleased(MouseEvent e) {
maybeShowPopup(e);
}

private void maybeShowPopup(MouseEvent e) {
if (e.isPopupTrigger()) {
(menu.getPopupMenu()).show(
e.getComponent(),
e.getX(),
e.getY());
}
}
    }
}
---------- END SOURCE ----------

CUSTOMER WORKAROUND :
No workaround found.
(Review ID: 143792)
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