Name: jk109818 Date: 04/08/2002


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 :Windows NT Version 4.0


A DESCRIPTION OF THE PROBLEM :
Under the Windows look and feel, when setSelectedItem is
invoked to set the selected item of an editable JComboBox,
the combo box gains focus if the new selected item is
different than the one it replaced. So if the user performs
an operation (such as entering data into a text field or
selecting from a list) that would by program design cause
an editable combo box to display a different selected item,
the user will notice that focus is suddenly lost on the
component which is currently being used. This happens
without the user explicitly requesting a focus change such
as pressing tab or clicking on another component.

This behavior did not occur with versions of Java prior to
1.4 nor does it occur with a non-editable combo box nor
does it occur with the Java look and feel.

  To demonstrate, compile and run the enclosed program under
Java 1.4 on a Windows operating system. Enter text into the
JTextField ( the top most field ) which matches the text of
the current item of the JComboBox (the bottom most field)
then press enter while still in the JTextField. Notice that
focus remains in the JTextField. Now enter text in the
JTextField which is different that the JComboBox and press
enter while still in the JTextField. Notice that the focus
jumps from the JTextField into the JComboBox.

While not the main point of this report, there is also
another behavior difference of JComboBox between Java 1.3
and 1.4 : When the selected item is changed either
programmatically ( using setSelectedItem ) or by the user
selecting from the drop down list, the entire selected item
is shown highlighted. This did not occur prior to version
1.4.



REGRESSION. Last worked in version 1.3

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1) Compile and run the enclosed program under Java 1.4 on a
Windows operating system.
2) Enter text into the JTextField ( the top most field )
which matches the text of the current item of the JComboBox
(the bottom most field) then press enter while still in the
JTextField. Notice that focus remains in the JTextField.
3) Now enter text in the JTextField which is different that
the JComboBox and press enter while still in the
JTextField. Notice that the focus jumps from the JTextField
into the JComboBox.


EXPECTED VERSUS ACTUAL BEHAVIOR :
I expect that invoking setSelectedItem to change the
selected item of a JComboBox without also setting focus to
it.

I found that invoking setSelectedItem has the undesired
side effect of setting focus to the JComboBox as well as
performing a "select all" on the displayed text.


This bug can be reproduced always.

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

public class ComboBoxTest1 extends JFrame
{
   //--------------------------------------------------------------------------
   public void vcInit()
   {
      //{{INIT_CONTROLS
setTitle("ComboBoxTest1");
getContentPane().setLayout(new GridLayout(2,1,0,10));
setSize(400,300);
setVisible(false);
textField.setColumns(24);
getContentPane().add(textField);
textField.setFont(new Font("MonoSpaced", Font.PLAIN, 14));
comboBox.setEditable(true);
getContentPane().add(comboBox);
comboBox.setFont(new Font("MonoSpaced", Font.PLAIN, 14));
      //}}
   }

   //--------------------------------------------------------------------------
   //{{DECLARE_CONTROLS
javax.swing.JTextField textField = new javax.swing.JTextField();
javax.swing.JComboBox comboBox = new javax.swing.JComboBox();
//}}
//{{DECLARE_MENUS
//}}

   //--------------------------------------------------------------------------
   public ComboBoxTest1()
   {
      vcInit();
      ((JPanel)getContentPane()).setBorder( new EmptyBorder( 20, 20, 20, 20 ) );
      
      textField.addActionListener
      ( new ActionListener()
         {
            public void actionPerformed( ActionEvent e )
            {
               comboBox.setSelectedItem( textField.getText() );
            }
         }
      );
      
      textField.addFocusListener
      ( new FocusListener()
         {
            public void focusGained( FocusEvent e )
            {
               System.out.println("textField got focus");
            }
            
            public void focusLost( FocusEvent e )
            {
               System.out.println("textField lost focus");
            }
         }
      );
      
      comboBox.addItem("aaa");
      comboBox.addItem("bbb");
      comboBox.addItem("ccc");
   }
   
   //--------------------------------------------------------------------------
   public static void main( String[] args ) throws Exception
   {
      String javaVersion = System.getProperties().getProperty("java.version");
      System.out.println( "Java version: " + javaVersion );
      
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
      
      ComboBoxTest1 window = new ComboBoxTest1();
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
window.setTitle( window.getTitle() + " - java version " +
javaVersion );
      window.pack();
      window.setVisible( true );
   }
}
---------- END SOURCE ----------

CUSTOMER WORKAROUND :
Use Java look and feel.

Release Regression From : 1.3.1_03
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: 145095)
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