Hello all:

I have a little problem. In the code below

1. How do I get the layout right? Right now its equally divided in the frame.

2. Now the Jpanels open and close but how do I get them to close if I open another panel? So, if i have 3 pen and I clicked 1, 3 would close and 1 would open.

A little help please!

Thanks


Code:
package desktopapplication2;

import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.image.BufferedImage;
import javax.swing.*;


public class Test {
	public static void main(String[] args) {

		JFrame f = new JFrame();
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                Container contentPane = f.getContentPane();
                //contentPane.setLayout(new BoxLayout(contentPane,BoxLayout.PAGE_AXIS));
                contentPane.setLayout(new BoxLayout(contentPane,BoxLayout.Y_AXIS));

		
                CollapsablePanel cp1 = new CollapsablePanel("test1", buildPanel());
                contentPane.add(cp1);

                CollapsablePanel cp2 = new CollapsablePanel("test2", buildPanel());
		contentPane.add(cp2);

                CollapsablePanel cp3 = new CollapsablePanel("test3", buildPanel());
		contentPane.add(cp3);

                f.setSize(360, 500);
		f.setLocation(200, 100);
		f.setVisible(true);



	}

	public static JPanel buildPanel() {
		GridBagConstraints gbc = new GridBagConstraints();
		gbc.insets = new Insets(2, 1, 2, 1);
		gbc.weightx = 1.0;
		gbc.weighty = 1.0;

		JPanel p1 = new JPanel(new GridBagLayout());
		gbc.gridwidth = gbc.RELATIVE;
		p1.add(new JButton("button 1"), gbc);
		gbc.gridwidth = gbc.REMAINDER;
		p1.add(new JButton("button 2"), gbc);
		gbc.gridwidth = gbc.RELATIVE;
		p1.add(new JButton("button 3"), gbc);
		gbc.gridwidth = gbc.REMAINDER;
		p1.add(new JButton("button 4"), gbc);

		return p1;
	}
}

class CollapsablePanel extends JPanel {

	private boolean selected;
	JPanel contentPanel_;
	HeaderPanel headerPanel_;

	private class HeaderPanel extends JPanel implements MouseListener {
		String text_;
		Font font;
		BufferedImage open, closed;
		final int OFFSET = 30, PAD = 5;

		public HeaderPanel(String text) {
			addMouseListener(this);
			text_ = text;
			font = new Font("sans-serif", Font.PLAIN, 12);
			// setRequestFocusEnabled(true);
			setPreferredSize(new Dimension(200, 20));
			int w = getWidth();
			int h = getHeight();

			/*try {
				open = ImageIO.read(new File("images/arrow_down_mini.png"));
				closed = ImageIO.read(new File("images/arrow_right_mini.png"));
			} catch (IOException e) {
				e.printStackTrace();
			}*/

		}

		protected void paintComponent(Graphics g) {
			super.paintComponent(g);
			Graphics2D g2 = (Graphics2D) g;
			g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
					RenderingHints.VALUE_ANTIALIAS_ON);
			int h = getHeight();
			/*if (selected)
				g2.drawImage(open, PAD, 0, h, h, this);
			else
				g2.drawImage(closed, PAD, 0, h, h, this);
                        */ // Uncomment once you have your own images
			g2.setFont(font);
			FontRenderContext frc = g2.getFontRenderContext();
			LineMetrics lm = font.getLineMetrics(text_, frc);
			float height = lm.getAscent() + lm.getDescent();
			float x = OFFSET;
			float y = (h + height) / 2 - lm.getDescent();
			g2.drawString(text_, x, y);
		}

		public void mouseClicked(MouseEvent e) {
			toggleSelection();
		}

		public void mouseEntered(MouseEvent e) {
		}

		public void mouseExited(MouseEvent e) {
		}

		public void mousePressed(MouseEvent e) {
		}

		public void mouseReleased(MouseEvent e) {
		}

	}

	public CollapsablePanel(String text, JPanel panel) {
		super(new GridBagLayout());
		GridBagConstraints gbc = new GridBagConstraints();
		gbc.insets = new Insets(1, 3, 0, 3);
		gbc.weightx = 1.0;
		gbc.fill = gbc.HORIZONTAL;
		gbc.gridwidth = gbc.REMAINDER;

		selected = false;
		headerPanel_ = new HeaderPanel(text);

		setBackground(new Color(200, 200, 220));
		contentPanel_ = panel;

		add(headerPanel_, gbc);
		add(contentPanel_, gbc);
		contentPanel_.setVisible(false);

		JLabel padding = new JLabel();
		gbc.weighty = 1.0;
		add(padding, gbc);

	}

	public void toggleSelection() {
		selected = !selected;

		if (contentPanel_.isShowing())
			contentPanel_.setVisible(false);
		else
			contentPanel_.setVisible(true);

		validate();

		headerPanel_.repaint();
	}

}