TO get focus of a specified field on tab

[Deboleena Chakraborty]

Hi,
I have a panel and 3 text boxs and 3 labels. 2 labels and 2 text boxes are visible when the panel is visible. The third can be seen if the panel is scrolled. But what i want is that when i tab out of the 2 nd text box the third text box should be seen i.e. the panel should scroll automatically and the focus should go at the place of the cursor.What should I do?
Regards
Deboleena
[ May 10, 2004: Message edited by: Deboleena Chakraborty ]

[Craig Wood]

You can use a FocusListener with the JComponent method scrollRectToVisible.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class ScrollingTest
{
    public static void main(String[] args)
    {
        final JTextField
            field2 = new JTextField(16),
            field3 = new JTextField(16);
        final JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(50,2,50,2);
        gbc.anchor = gbc.EAST;
        panel.add(new JLabel("label 1"), gbc);
        gbc.gridwidth = gbc.REMAINDER;
        gbc.anchor = gbc.WEST;
        panel.add(new JTextField(16), gbc);
        gbc.gridwidth = gbc.RELATIVE;
        gbc.anchor = gbc.EAST;
        panel.add(new JLabel("label 2"), gbc);
        gbc.gridwidth = gbc.REMAINDER;
        gbc.anchor = gbc.WEST;
        panel.add(field2, gbc);
        gbc.gridwidth = gbc.RELATIVE;
        gbc.anchor = gbc.EAST;
        panel.add(new JLabel("labe 3"), gbc);
        gbc.anchor = gbc.WEST;
        gbc.gridwidth = gbc.REMAINDER;
        panel.add(field3, gbc);
        FocusListener l = new FocusAdapter()
        {
            public void focusGained(FocusEvent e)
            {
                // for focus transfer from only feild2
                if(e.getOppositeComponent() == field2)
                    panel.scrollRectToVisible(field3.getBounds());
            }
        };
        field3.addFocusListener(l);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new JScrollPane(panel));
        f.setSize(400,300);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}