Name: jk109818 Date: 03/14/2002


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 :
Windows XP

ADDITIONAL OPERATING SYSTEMS :
Windows 2000 Version 5.00
Windows 98 Version 4.10

Windows NT Version 4 (SP 6)

A DESCRIPTION OF THE PROBLEM :
This problem occurs on Window XP, NT 2000 and Windows 98
operating systems. It does not occur on NT4.

This problem occurs with the Look and Feel Windows (NOT
ClassicWindows) only.

After showing a popup menu owning a focusable component,
selecting an item from a drop list belonging to a combo box
is not possible anymore. As well, clicking the combobox
scrollbar causes the combobox to be closed.

NOTE: Many bug reports turn around this issue, including the
4168483, but all of them are closed though the bug is still
there or has reappeared !!

Best regards,
Jean-Bernard

REGRESSION. Last worked in version 1.3.1

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Select an item from the combobox to see if everything is
okay.
2. Click on the "click here..." text to open a popup menu.
3. Reselect an item from the combobox, or click on the
combobox scrollbar. Items are not selectable anymore, and
the combobox is closed immediately.
4. To test the workaround, you may select the "apply work
around" check box. In this case, everything works fine.

Best regards,
Jean-Bernard

EXPECTED VERSUS ACTUAL BEHAVIOR :
The combobox items should be selectable, it does not happen
if you do not use the workaround.

This bug can be reproduced always.

---------- BEGIN SOURCE ----------

/**
 * ComboBox1Merlin.java
 */
import java.lang.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

/**
 * Class: ComboBox1Merlin
 */
public class ComboBox1Merlin extends javax.swing.JFrame
   {
    JPopupMenu popupMenu;
    static boolean workaround = false;
    /**
     * Constructor: ComboBox1Merlin
     * @return instance of ComboBox1Merlin
     */
    public ComboBox1Merlin()
       {
        super();

        final JPanel panel = new JPanel();

        final JTextArea ppFocusItem = new JTextArea();
        /* Bean Properties */
        ppFocusItem.setName("JTextArea");
        ppFocusItem.setLineWrap(true);
        ppFocusItem.setRows(5);
        ppFocusItem.setWrapStyleWord(true);
        ppFocusItem.setMargin(new Insets(2,4,2,4));
        
        /* JPopupMenu */
        popupMenu = new JPopupMenu();
        /* Adds Child */
        popupMenu.add(new JScrollPane(ppFocusItem));

        final JLabel label = new JLabel();
        /* JLabel - Bean Properties */
        label.setText("Click here...");
        label.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        javax.swing.border.EtchedBorder border;
        int bevelType = javax.swing.border.EtchedBorder.LOWERED;
        border = new javax.swing.border.EtchedBorder(bevelType,null,null);
        label.setBorder(new
javax.swing.border.CompoundBorder(popupMenu.getBorder(),border));
        /* JLabel - sets Bounds */
        label.setBounds(30,100,120,24);
        label.addMouseListener(new java.awt.event.MouseAdapter()
          {
           public void mousePressed(java.awt.event.MouseEvent e)
              {
               Point p = label.getLocation();
               popupMenu.show(panel,p.x,p.y+label.getHeight());
               ppFocusItem.requestFocus();
              }
          });

        final JComboBox comboBox = new JComboBox()
           {
            public void updateUI()
               {
                super.updateUI();
                if (workaround &&
System.getProperty("java.version").compareTo("1.4.0") == 0)
                   { // A workaround. patch 1.4.0 //
                    if (UIManager.getLookAndFeel() instanceof
com.sun.java.swing.plaf.windows.WindowsLookAndFeel)
                       {
                        com.sun.java.swing.plaf.windows.WindowsLookAndFeel ln =
(com.sun.java.swing.plaf.windows.WindowsLookAndFeel)UIManager.getLookAndFeel();
                        if (!ln.isClassicWindows())
                           {
                            setLightWeightPopupEnabled(false);
                            return;
                           }
                       }
                    setLightWeightPopupEnabled(true);
                   }
               }
           };
        /* JComboBox - Bean Properties */
        comboBox.setName("JComboBox");
        /* JComboBox - sets Bounds */
        comboBox.setBounds(30,50,120,22);
        comboBox.setPreferredSize(new java.awt.Dimension(100,22));
        for (int i = 0; i < 20; i++)
             comboBox.addItem("" + i);
             
        final JCheckBox checkBox = new JCheckBox();
        checkBox.setText("Apply workaround");
        checkBox.setBounds(30,150,120,22);
        checkBox.addActionListener(new java.awt.event.ActionListener()
           {
            public void actionPerformed(java.awt.event.ActionEvent e)
               {
                workaround = checkBox.isSelected();
                if (!workaround)
                    comboBox.setLightWeightPopupEnabled(true);
                comboBox.updateUI();
               }
           });
                 
        /* JPanel - Bean Properties */
        panel.setName("JPanel");
        /* JPanel - set Layout */
        panel.setLayout(null);
        /* JPanel - Adds Child */
        panel.add(comboBox);
        panel.add(label);
        panel.add(checkBox);

        /* javax.swing.JFrame - Bean Properties */
        setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
        setName("JFrame");
        setTitle("Title");
        /* javax.swing.JFrame - sets Bounds */
        setBounds(50,100,300,300);
        /* javax.swing.JFrame - Adds Child */
        getContentPane().add(panel,java.awt.BorderLayout.CENTER);

       } /* End of Constructor: ComboBox1Merlin */

    /**
     * Method: generalHandleException <br>
     * @param java.lang.Throwable exception
     * @return void
     */
    protected void generalHandleException(java.lang.Throwable exc)
       {
        exc.printStackTrace(System.err);
       } /* End of Method: generalHandleException */

    /**
     * Method: main <br>
     * Note: Called only if we're an application. <br>
     * @param java.lang.String[] args the command line arguments
     * @return void
     */
    public static void main(java.lang.String[] args)
       {
        try
           {
            /* Set native look and feel */
            
javax.swing.UIManager.setLookAndFeel(javax.swing.UIManager.getSystemLookAndFeelC
lassName());

            /* Creates new MainObject */
            ComboBox1Merlin self = new ComboBox1Merlin();
            self.show();
           } /* End try */
        catch (java.lang.Throwable exc)
           {
            exc.printStackTrace(System.err);
           } /* End catch */
       } /* End of Method: main */

   } /* End of Class: ComboBox1Merlin */



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

CUSTOMER WORKAROUND :
The WorkAround consists in the fact that the JCombobox sets
LightWeightPopupEnabled according with the other PopupMenus
factory for the current LookAndFeel.

JComboBox comboBox = new JComboBox()
   {
    public void updateUI()
       {
        super.updateUI();
        if
(System.getProperty("java.version").compareTo("1.4.0") == 0)
           { // A workaround. patch 1.4.0 //
            if (UIManager.getLookAndFeel() instanceof
com.sun.java.swing.plaf.windows.WindowsLookAndFeel)
               {
                
com.sun.java.swing.plaf.windows.WindowsLookAndFeel ln =
(com.sun.java.swing.plaf.windows.WindowsLookAndFeel)UIManage
r.getLookAndFeel();
                if (!ln.isClassicWindows())
                   {
                    setLightWeightPopupEnabled(false);
                    return;
                   }
               }
            setLightWeightPopupEnabled(true);
           }
       }
   };

Release Regression From : 1.3.1
The above release value was the last known release where this
bug was known to work. Since then there has been a regression.

(Review ID: 143968)
======================================================================