Tabbing in a JScrollPane

Hello,
I haved added a JPanel to a JScrollPane. The JPanel contains multiple JTextFields arrayed vertically (using a GridBagLayout). When I tab from one JTextField to another, I would like the JScrollPane to scroll down to display the JTextField that currently has the focus.
Does anyone know how to do this?
Thanks,
-Jeff Wisard

First, Jeff, please change your user name from jwisard to something that follows the JavaRanch Username Convention like Jeff Wisard...

Next... on to the problem... it sounds simple enough to solve...

Just add a FocusListener to your JTextFields that looks something like the following...

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class ScrollTab extends JFrame {
    JScrollPane scroll;
 
    public static void main( String[] arg ) {
        new ScrollTab();
    }
 
    public ScrollTab() {
        JPanel p = new JPanel();
        p.setLayout( new GridLayout( 120, 1 ) );
        for ( int i = 0; i < 120; i++ ) {
            JTextField currentField = new JTextField( 10 );
            currentField.setText( "Component " + ( i + 1 ) );
            currentField.addFocusListener( new ScrollView() );
            p.add( currentField );
        }
        scroll = new JScrollPane(p);
        getContentPane().add( scroll );
        setSize( 300, 300 );
        setVisible( true );
        addWindowListener( new ExitHandler() );
    }
 
    private class ExitHandler extends WindowAdapter {
        public void windowClosing( WindowEvent e ) {
            System.exit( 0 );
        }
    }
 
    private class ScrollView extends FocusAdapter {
        public void focusGained( FocusEvent e ) {
            JTextField source = ( JTextField )e.getSource();
            JViewport view = scroll.getViewport();
            view.scrollRectToVisible( source.getBounds() );
            scroll.repaint();
        }
    }
}

However, the behavior of scrollRectToVisible( Rectangle ) sometimes breaks... so you'll have to mess with it to get something appropriate to your layout... ( The following listener almost works perfectly with the previous code... it still jumps around a bit more than I like, though... )

-Nate

Thanks!