Need a idea on GridBagLayout

[ddsuresh]

I need idea on GridBagLayout.
When ever I load dialog with below, without values in JList. It is working properly - http://sureshdevi.co.in/test/example1.jpg
While loading dialog with values in JList, Notes JTextArea getting increased. I want to make Notes as a Fixed Size. I tried with setPreferredSize but no use. http://sureshdevi.co.in/test/example2.jpg

private JPanel createPanel() {
		JPanel jpMain = new JPanel(new GridBagLayout());
		jpMain.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
		GridBagConstraints gbc = new GridBagConstraints();
		
		gbc.gridx = 0;
		gbc.gridy = 0;
		gbc.gridwidth = 1;
		gbc.weightx = 0.0;
		gbc.fill = GridBagConstraints.NONE;
		gbc.anchor = GridBagConstraints.NORTHWEST;
		JLabel jlLookupText = new JLabel("Lookup text:");
		jpMain.add(jlLookupText, gbc);
		
		gbc.gridx = 1;
		gbc.gridy = 0;
		gbc.gridwidth = 8;
		gbc.weightx = 1.0;
		gbc.insets = new Insets(0, 5, 0, 5);		
		gbc.fill = GridBagConstraints.HORIZONTAL;
		jtfLookupText = new JTextField();
		jtfLookupText.setAlignmentX(Component.CENTER_ALIGNMENT);
		jpMain.add(jtfLookupText, gbc);
		
		gbc.gridx = 9;
		gbc.gridy = 0;
		gbc.gridwidth = 1;
		gbc.weightx = 0.0;
		gbc.insets = new Insets(0, 0, 0, 0);
		gbc.fill = GridBagConstraints.NONE;
		jbLookup = new JButton("Lookup");
		jbLookup.setAlignmentX(Component.CENTER_ALIGNMENT);
		jpMain.add(jbLookup, gbc);
		
		gbc.gridx = 0;
		gbc.gridy = 1;
		gbc.gridwidth = 1;
		gbc.weightx = 0.0;
		gbc.insets = new Insets(5, 0, 0, 0);		
		gbc.fill = GridBagConstraints.NONE;
		JLabel jlResults = new JLabel("Results:");
		jpMain.add(jlResults, gbc);
		
		gbc.gridx = 0;
		gbc.gridy = 2;
		gbc.gridwidth = 10;
		gbc.weightx = 1.0;
		gbc.weighty = 1.0;
		gbc.gridheight = 5;
		gbc.insets = new Insets(5, 0, 5, 0);
		gbc.anchor = GridBagConstraints.CENTER;
		gbc.fill = GridBagConstraints.BOTH;
		jlLookupResults = new JList(new Vector());
		jlLookupResults.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		jlLookupResults.setCellRenderer(new MatchElementRenderer());
        JScrollPane jspCustomPane = new JScrollPane(jlLookupResults, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);			
		jpMain.add(jspCustomPane, gbc);
		
		gbc.gridx = 0;
		gbc.gridy = 8;
		gbc.gridwidth = 1;
		gbc.weightx = 0.0;
		gbc.weighty = 0.0;
		gbc.gridheight = 1;
		gbc.insets = new Insets(0, 0, 0, 0);
		gbc.anchor = GridBagConstraints.SOUTHWEST;
		gbc.fill = GridBagConstraints.NONE;
		JLabel jlNotes = new JLabel("Notes:");
		jpMain.add(jlNotes, gbc);
		
		gbc.gridx = 0;
		gbc.gridy = 9;
		gbc.gridwidth = 10;
		gbc.weightx = 1.0;
		gbc.weighty = 1.0;
		gbc.gridheight = 3;
		gbc.insets = new Insets(5, 0, 5, 0);
		gbc.anchor = GridBagConstraints.SOUTHWEST;
		gbc.fill = GridBagConstraints.BOTH;
		jtaNotes = new JTextArea();
		jtaNotes.setEditable(false);
		jtaNotes.setFont(jtfLookupText.getFont());
		jtaNotes.setBackground(getBackground());
        JScrollPane jspNotesPane = new JScrollPane(jtaNotes, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
		jpMain.add(jspNotesPane, gbc);
		
		gbc.gridx = 8;
		gbc.gridy = 13;
		gbc.gridwidth = 1;
		gbc.weightx = 0.0;
		gbc.weighty = 0.0;
		gbc.gridheight = 1;
		gbc.insets = new Insets(5, 0, 0, 5);
		gbc.anchor = GridBagConstraints.EAST;		
		gbc.fill = GridBagConstraints.NONE;
		jbSelect = new JButton("Select");
		jpMain.add(jbSelect, gbc);
		
		gbc.gridx = 9;
		gbc.gridy = 13;
		gbc.gridwidth = 1;
		gbc.weightx = 0.0;
		gbc.weighty = 0.0;
		gbc.gridheight = 1;
		gbc.insets = new Insets(5, 0, 0, 0);
		gbc.anchor = GridBagConstraints.EAST;		
		gbc.fill = GridBagConstraints.NONE;
		jbCancel = new JButton("Cancel");
		jpMain.add(jbCancel, gbc);

		return jpMain;
	}

[hardwired]

import java.awt.*;
import java.util.Vector;
import javax.swing.*;

public class GBLTest {
    JList jlLookupResults;

    private JTabbedPane getContent() {
        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.addTab("another approach", tryThis());
        tabbedPane.addTab("modified original", createPanel());
        return tabbedPane;
    }

    private JPanel tryThis() {
        JPanel panel = new JPanel(new GridBagLayout());
        panel.setBorder(BorderFactory.createEmptyBorder(5, 10, 5, 10));
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(0,2,0,2);
        gbc.weighty = 1.0;
        // row 1
        JTextField jtfLookupText = new JTextField();
        gbc.weightx = 0;
        panel.add(new JLabel("Lookup text:"), gbc);
        gbc.weightx = 1.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        panel.add(jtfLookupText, gbc);
        gbc.weightx = 0;
        gbc.fill = GridBagConstraints.NONE;
        panel.add(new JButton("Lookup"), gbc);
        // row 2
        gbc.gridy = 1;
        gbc.weightx = 1.0;
        gbc.gridwidth = 3;
        gbc.anchor = GridBagConstraints.WEST;
        panel.add(new JLabel("Results:"), gbc);
        // row 3
        jlLookupResults = new JList(new Vector());
        jlLookupResults.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
//        jlLookupResults.setCellRenderer(new MatchElementRenderer());
        JScrollPane jspCustomPane = new JScrollPane(jlLookupResults);
        gbc.gridy++;
        gbc.anchor = GridBagConstraints.CENTER;
        gbc.fill = GridBagConstraints.BOTH;
        panel.add(jspCustomPane, gbc);
        // row 4
        gbc.gridy++;
        gbc.anchor = GridBagConstraints.WEST;
        gbc.fill = GridBagConstraints.NONE;
        panel.add(new JLabel("Notes:"), gbc);
        // row 5
        gbc.gridy++;
        JTextArea jtaNotes = new JTextArea(3,20);
        jtaNotes.setEditable(false);
        jtaNotes.setFont(jtfLookupText.getFont());
//        jtaNotes.setBackground(getBackground());
        JScrollPane jspNotesPane = new JScrollPane(jtaNotes,
                       JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                       JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        gbc.anchor = GridBagConstraints.CENTER;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        panel.add(jspNotesPane, gbc);
        // row 6
        gbc.gridy++;
        gbc.anchor = GridBagConstraints.EAST;
        gbc.fill = GridBagConstraints.NONE;
        gbc.gridwidth = 2;
        panel.add(new JButton("Select"), gbc);
        gbc.weightx = 0;
        gbc.gridwidth = 1;
        panel.add(new JButton("Cancel") , gbc);
        return panel;
    }

    private JPanel createPanel() {
        JPanel jpMain = new JPanel(new GridBagLayout());
        jpMain.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
        GridBagConstraints gbc = new GridBagConstraints();

        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.gridwidth = 1;
        gbc.weightx = 0.0;
        gbc.fill = GridBagConstraints.NONE;
        // Not necessary.
//        gbc.anchor = GridBagConstraints.NORTHWEST;
        JLabel jlLookupText = new JLabel("Lookup text:");
        jpMain.add(jlLookupText, gbc);

        gbc.gridx = 1;
        gbc.gridy = 0;
        // The gridwidth is determined by the row with the maximum
        // number of components. For this layout there are three
        // columns. So each component in row 1 will have gridwidth = 1.
//        gbc.gridwidth = 8;
        gbc.weightx = 1.0;
        gbc.insets = new Insets(0, 5, 0, 5);		
        gbc.fill = GridBagConstraints.HORIZONTAL;
        JTextField jtfLookupText = new JTextField();
        jtfLookupText.setAlignmentX(Component.CENTER_ALIGNMENT);
        jpMain.add(jtfLookupText, gbc);

        // see note about gridwidth above.
        gbc.gridx = 2;
//        gbc.gridx = 9;
        gbc.gridy = 0;
        gbc.gridwidth = 1;
        gbc.weightx = 0.0;
        gbc.insets = new Insets(0, 0, 0, 0);
        gbc.fill = GridBagConstraints.NONE;
        JButton jbLookup = new JButton("Lookup");
        jbLookup.setAlignmentX(Component.CENTER_ALIGNMENT);
        jpMain.add(jbLookup, gbc);

        gbc.gridx = 0;
        gbc.gridy = 1;
        gbc.gridwidth = 1;
        gbc.weightx = 0.0;
        gbc.insets = new Insets(5, 0, 0, 0);		
        gbc.fill = GridBagConstraints.NONE;
        JLabel jlResults = new JLabel("Results:");
        jpMain.add(jlResults, gbc);

        gbc.gridx = 0;
        gbc.gridy = 2;
        // This one component spans across three columns:
        gbc.gridwidth = 3;
//        gbc.gridwidth = 10;
        gbc.weightx = 1.0;
        gbc.weighty = 1.0;
        // This is for a component spanning multiple rows.
        // In this layout each component spans one row so
        // the gridheight remains at its default value of one.
//        gbc.gridheight = 5;
        gbc.insets = new Insets(5, 0, 5, 0);
        gbc.anchor = GridBagConstraints.CENTER;
        gbc.fill = GridBagConstraints.BOTH;
        JList jlLookupResults = new JList(new Vector());
        jlLookupResults.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
//        jlLookupResults.setCellRenderer(new MatchElementRenderer());
        JScrollPane jspCustomPane = new JScrollPane(jlLookupResults,
                       JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                       JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);			
        jpMain.add(jspCustomPane, gbc);

        gbc.gridx = 0;
        // In a way similiar to the way GridBagLayout determines
        // the number of columns (above) it figures the number
        // of rows by the column with the most components in it.
        // For this layout there are 6 rows. 
        gbc.gridy = 3;
//        gbc.gridy = 8;
        gbc.gridwidth = 1;
        gbc.weightx = 0.0;
        gbc.weighty = 0.0;
        gbc.gridheight = 1;
        gbc.insets = new Insets(0, 0, 0, 0);
        // The anchor constraint needs a non-zero weight value(s).
//        gbc.anchor = GridBagConstraints.SOUTHWEST;
        gbc.fill = GridBagConstraints.NONE;
        JLabel jlNotes = new JLabel("Notes:");
        jpMain.add(jlNotes, gbc);

        gbc.gridx = 0;
        gbc.gridy = 4;
//        gbc.gridy = 9;
        gbc.gridwidth = 3;
//        gbc.gridwidth = 10;
        gbc.weightx = 1.0;
        gbc.weighty = 1.0;
        // Component only spans a single row. So gbc.gridheight is still 1.
//        gbc.gridheight = 3;
        gbc.insets = new Insets(5, 0, 5, 0);
        // Not necessary.
//        gbc.anchor = GridBagConstraints.SOUTHWEST;
        // Better to give a size hint here to avoid squirrely behavior.
//        gbc.fill = GridBagConstraints.BOTH;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        JTextArea jtaNotes = new JTextArea(3, 20);  // size hint
        jtaNotes.setEditable(false);
        jtaNotes.setFont(jtfLookupText.getFont());
//        jtaNotes.setBackground(getBackground());
        // AS_NEEDED is the default for both JScrollBars in JScrollPane.
        JScrollPane jspNotesPane = new JScrollPane(jtaNotes);//,
//                       JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
//                       JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        jpMain.add(jspNotesPane, gbc);

        gbc.gridx = 1;  // middle column
//        gbc.gridx = 8;
        gbc.gridy = 5;
//        gbc.gridy = 13;
        gbc.gridwidth = 1;
        gbc.weightx = 0.0;
        gbc.weighty = 0.0;
        gbc.gridheight = 1;
        gbc.insets = new Insets(5, 0, 0, 5);
        gbc.anchor = GridBagConstraints.EAST;		
        gbc.fill = GridBagConstraints.NONE;
        JButton jbSelect = new JButton("Select");
        jpMain.add(jbSelect, gbc);

        gbc.gridx = 2;
//        gbc.gridx = 9;
        gbc.gridy = 5;
//        gbc.gridy = 13;
        gbc.gridwidth = 1;
        gbc.weightx = 0.0;
        gbc.weighty = 0.0;
        gbc.gridheight = 1;
        gbc.insets = new Insets(5, 0, 0, 0);
        gbc.anchor = GridBagConstraints.EAST;		
        gbc.fill = GridBagConstraints.NONE;
        JButton jbCancel = new JButton("Cancel");
        jpMain.add(jbCancel, gbc);
        return jpMain;
    }

    /**
     * Wait 3 seconds and then add data to the list
     * in the tryThis/"another approach" tab to see
     * if the components change size.
     */
    private void addToVector() {
        new Thread(new Runnable() {
            public void run() {
                try {
                    Thread.sleep(3000);
                } catch(InterruptedException e) {
                    System.exit(1);
                }
                Object[] data = new Object[10];
                for(int j = 0; j < data.length; j++)
                    data[j] = "New data for line " + (j+1);
                System.out.println("adding data to list");
                jlLookupResults.setListData(data);
            }
        }).start();
    }

    public static void main(String[] args) {
        GBLTest test = new GBLTest();
        JDialog d = new JDialog();
        d.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
        d.add(test.getContent());
        d.setSize(500,400);
        d.setLocationRelativeTo(null);
        d.setVisible(true);
        test.addToVector();
    }
}