Name: rmT116609 Date: 05/28/2003


FULL PRODUCT VERSION :
java version "1.4.2-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-beta-b19)
Java HotSpot(TM) Client VM (build 1.4.2-beta-b19, mixed mode)

FULL OS VERSION :
Microsoft Windows 2000 [Version 5.00.2195]

A DESCRIPTION OF THE PROBLEM :
When a JPopupMenu is displayed, an underlying Default JButton still responds to the CTRL-ENTER keystroke.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and run the test applet (below).
Click the "Popup" button.
(The popup menu is displayed.)
Type CTRL-ENTER while the popup menu is still active.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I expect CTRL-ENTER to be ignored while the popup menu is active.
ACTUAL -
The underlying "Default" button visibly "clicks".
The console output shows that the "Default" button produced an ActionEvent in response to CTRL-ENTER.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Console output:
actionPerformed: JButton: Popup
actionPerformed: JButton: Default

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
// Applet demonstrates JPopupMenu/Default-JButton bug.

import java.awt.event.*;
import javax.swing.*;

public class JApplet1 extends JApplet implements ActionListener
{
  private JButton btnPopup = new JButton("Popup");
  private JButton btnDefault = new JButton("Default");
  private JPopupMenu popupMenu = new JPopupMenu();

  public void init()
  {
    // Create 2 buttons
    getContentPane().setLayout(null);
    setSize(260,130);
    getContentPane().add(btnPopup);
    btnPopup.setBounds(20,50,100,40);
    getContentPane().add(btnDefault);
    btnDefault.setBounds(140,50,100,40);

    btnPopup.addActionListener(this);
    btnDefault.addActionListener(this);

    getRootPane().setDefaultButton(btnDefault);

    // Build popup menu
    for (int m=1; m <= 6; m++) {
      JMenuItem item = new JMenuItem("Item" + m);
      popupMenu.add(item);
      item.addActionListener(this);
    }
  }

  public void actionPerformed(ActionEvent e)
  {
    System.out.println("actionPerformed: " + describeComponent(e.getSource()));
    if (e.getSource() == btnPopup) {
      popupMenu.show(btnPopup, -(btnPopup.getWidth()/2), -(btnPopup.getHeight()/2));
    }
  }

  private String describeComponent(Object o)
  {
    if (o instanceof JButton) return "JButton: " + ((JButton)o).getText();
    if (o instanceof JMenuItem) return "JMenuItem: " + ((JMenuItem)o).getText();
    return o.getClass().getName();
  }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Call the following function on every JMenu, JPopupMenu, JMenuItem and JCheckBoxMenuItem:

  // eatUpCtrlEnter
  // This is called on each menu component.
  // It causes the menu component to eat the CTRL-ENTER keystroke so that the
  // underlying default button is not activated.
  public static void eatUpCtrlEnter(JComponent jc)
  {
    jc.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(
       CTRL_ENTER, doNothingCmd);
    jc.getActionMap().put(doNothingCmd, doNothingAction);
  }

  private static final String doNothingCmd = "doNothing";
  private static final KeyStroke CTRL_ENTER
    = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, Event.CTRL_MASK);
  private static final Action doNothingAction
     = new AbstractAction() { public void actionPerformed(ActionEvent e) {}};
(Review ID: 186608)
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