Name: ssT124754 Date: 02/01/2001


vegala 43% java -version
java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0)
Java HotSpot(TM) Client VM (build 1.3.0, mixed mode)


Traversing between the items in a JMenu back to the item in the originating
JPopupMenu (that includes a JMenu) while holding the mouse key will cause the
JVM to coredump. This happens regardless of the location of the popup or which
mouse button is pressed.

Using DBX we can see that the core happens inside a MOTIF API call.

The following demo will coredump if the user holds the mouse key while
traversing between menu items. To display the JPopupMenu just press one of the
buttons or "right click" on the JWindow.

/************************************************************/

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

public class JPopupCoreDemo extends JWindow
{
  private JButton btn1;
  private JButton btn2;
  private JButton btn3;

  private JPopupMenu popup;
  private JMenu menu;
  private JMenuItem[] mainMenuItems;
  private JMenuItem[] subMenuItems;

  public JPopupCoreDemo()
  {
    super();
    
    menu = new JMenu("Menu 1");
    
    for(int i=0; i<5; i++)
    {
      menu.add( "Sub MenuItem " + Integer.toString(i) );
      if( (0 != i) && (0 == i%2) )
        menu.addSeparator();
    }

    popup = new JPopupMenu("Demo JPopupMenu");
    popup.setLightWeightPopupEnabled(true);
    popup.add( menu );
    popup.addSeparator();

    ActionListener listener = new ActionListener()
      {
        public void actionPerformed (ActionEvent evt)
        {
          System.out.println("Doing something");
        }
      };
    
    for(int j=0; j<10; j++)
    {
      JMenuItem mi = popup.add( "Main MenuItem " + Integer.toString(j) );
      mi.addActionListener( listener );
      
      if( (0 != j) && (0 == j%2) )
        popup.addSeparator();
    }

    btn1 = new JButton("Button1");
    btn1.setToolTipText("Show JPopupMenu");
    btn1.addActionListener( new ActionListener()
      {
        public void actionPerformed (ActionEvent evt)
        {
           popup.show( btn1, 0, btn1.getSize().height );
        }
      });

    btn2 = new JButton("Button2");
    btn2.setToolTipText("Show JPopupMenu");
    btn2.addActionListener( new ActionListener()
      {
        public void actionPerformed (ActionEvent evt)
        {
           popup.show( btn2, 0, btn2.getSize().height );
        }
      });

    btn3 = new JButton("Button3");
    btn3.setToolTipText("Show JPopupMenu");
    btn3.addActionListener( new ActionListener()
      {
        public void actionPerformed (ActionEvent evt)
        {
           popup.show( btn3, 0, btn3.getSize().height );
        }
      });

    Box bx = Box.createHorizontalBox();
    bx.add(btn1);
    bx.add(Box.createHorizontalGlue());
    bx.add(btn2);
    bx.add(Box.createHorizontalGlue());
    bx.add(btn3);

    super.setContentPane( bx );

    MouseAdapter mouseAdp = new MouseAdapter()
      {
        public void mouseClicked(MouseEvent e)
        {
          if( (( e.getModifiers() & e.BUTTON3_MASK ) != 0 ) ||
              e.isPopupTrigger() )
          {
            popup.show( e.getComponent(), e.getX(), e.getY() );
          }
        }
      };

    super.addMouseListener(mouseAdp);

    pack();

    super.setSize( super.getToolkit().getScreenSize().width,
                   super.getSize().height );

    super.setVisible(true);
  }

  public static void main(String[] arg)
  {
    new JPopupCoreDemo();
  }
  
}

/************************************************************/
(Review ID: 116234)
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