JDesktopPane / JInternalFrames and Focus

Question

Hi,
I am running into a confusing focus issue with JDesktopPane and JInternalFrames. The problem is that when I close a JInternalFrame that has the keyboard focus, the DesktopPane will activate another internal frame, but that internal frame doesn't get the keyboard focus. I thought that some of my extension classes might be screwing this up, but I can recreate the problem using just the basic JDesktopPane and JInternalFrame objects. Has anyone run into this before? If so, how have you gotten around it? I'm using JDK 1.5 and the default Metal LAF.
I have included a little application that demonstrates the issue. Click on one frame, then click on another frame and close this frame. The first frame will be active (ie highlighted), but it doesn't own the keyboard focus. Acutally the first frame gains the focus and then immediately looses the focus.
Thanks for any help,
-Yeath
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class DesktopTest extends JFrame
   private JDesktopPane desktop_pane;
   private int number;
   public DesktopTest()
      super( "DesktopTest Application" );
      this.desktop_pane = new JDesktopPane();
      this.number = 0;
      this.getContentPane().setLayout( new BorderLayout() );
      this.getContentPane().add( this.desktop_pane, BorderLayout.CENTER );
      JMenuBar menu_bar = new JMenuBar();
      JMenu file_menu = new JMenu( "File" );
      file_menu.add( new AbstractAction( "New Frame", null )
         public void actionPerformed( ActionEvent e )
            newFrame();
      menu_bar.add( file_menu );
      this.setJMenuBar( menu_bar );
      for( int i = 0; i < 4; i++ )
         newFrame();
   private void newFrame()
      final JInternalFrame jif = new JInternalFrame( "Frame " + Integer.toString( number + 1 ), true, true, true );
      jif.getContentPane().setLayout( new BorderLayout() );
      JTextField jtf = new JTextField();
      jif.getContentPane().add( jtf );
      jif.setBounds( number * 30, number * 30, 150, 100 );
      jtf.addFocusListener( new FocusListener()
         public void focusGained( FocusEvent e )
            System.out.println( jif.getTitle() + " has gained the focus" );
         public void focusLost( FocusEvent e )
            System.out.println( jif.getTitle() + " has lost the focus" );
      this.desktop_pane.add( jif );
      jif.setVisible( true );
      this.number++;
   public static void main( String[] args )
      DesktopTest desktop = new DesktopTest();
      desktop.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
      desktop.setSize( 800, 800 );
      desktop.setVisible( true );
}

Answer 1

Thanks for the replies,
This sounds very much like the bug that has already been reported. But the work around doesn't seem to solve the problem. I catch the internalFrameClosed() event, and have the newly selected frame request the keyboard focus. But still I run into the situation where the frame gets the focus and immediately looses it again. If you look at the debug statements when executing the app, you'll see what i mean.
Here is my updated newFrame function
private void newFrame()
   final JInternalFrame jif = new JInternalFrame( "Frame " + Integer.toString( number + 1 ), true, true, true, true );
   jif.getContentPane().setLayout( new BorderLayout() );
   final JTextField jtf = new JTextField();
   jif.getContentPane().add( jtf );
   jif.setBounds( number * 30, number * 30, 150, 100 );
   jif.addInternalFrameListener( new InternalFrameAdapter()
      public void internalFrameActivated( InternalFrameEvent e )
         jtf.requestFocusInWindow();
      public void internalFrameClosed( InternalFrameEvent e )
         JInternalFrame selected = desktop_pane.getSelectedFrame();
         if( selected != null )
            selected.requestFocus();
   jtf.addFocusListener( new FocusListener()
      public void focusGained( FocusEvent e )
         System.out.println( jif.getTitle() + " has gained the focus" );
      public void focusLost( FocusEvent e )
         System.out.println( jif.getTitle() + " has lost the focus" );
   this.desktop_pane.add( jif );
   jif.setVisible( true );
   this.number++;
}When I run this, and close a frame, I get the following debug output: It is as if nothing owns the keyboard focus after closing a frame.
Frame 2 has lost the focus
Frame 1 has gained the focus
Frame 1 has lost the focusThanks for your help,
-Yeath