sketcher2/src/com/jotuntech/sketcher/client/JCollapsiblePanel.java

package com.jotuntech.sketcher.client;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;

public class JCollapsiblePanel extends JPanel {
	private final static Icon expandedIcon = UIManager.getIcon("Tree.expandedIcon");
	private final static Icon collapsedIcon = UIManager.getIcon("Tree.collapsedIcon");
	private final static Icon pinNormalIcon = new ImageIcon(JCollapsiblePanel.class.getResource("images/pin_normal.png"));
	private final static Icon pinStuckIcon = new ImageIcon(JCollapsiblePanel.class.getResource("images/pin_stuck.png"));
	private JLabel label;
	private JLabel pin;
	private JPanel contentPane;
	private JCollapsiblePanelGroup group;
	private boolean stuck;
	private int id;
	private boolean expandedByDefault, stuckByDefault;

	public JCollapsiblePanel(int id, String title, boolean expanded, boolean stuckx) {
		super();

		this.id = id;

		this.stuck = stuckx;
		this.stuckByDefault = stuckx;
		this.expandedByDefault = expanded;

		setBorder(new EmptyBorder(0, 0, 1, 0));
		setAlignmentX(Component.LEFT_ALIGNMENT);
		setLayout(new BorderLayout());

		JPanel topPanel = new JPanel(new BorderLayout());
		topPanel.setAlignmentX(Component.LEFT_ALIGNMENT);
		add(topPanel, BorderLayout.NORTH);

		label = new JLabel();
		label.setIcon(expanded ? expandedIcon : collapsedIcon);
		label.setText(title);
		label.addMouseListener(new MouseListener() {
			public void mouseClicked(MouseEvent arg0) {
			}

			public void mouseEntered(MouseEvent arg0) {
			}

			public void mouseExited(MouseEvent arg0) {
			}

			public void mousePressed(MouseEvent arg0) {
			}

			public void mouseReleased(MouseEvent arg0) {
				if(!stuck) {
					setExpanded(!contentPane.isVisible(), true);
				}
			}
		});
		label.setAlignmentX(Component.LEFT_ALIGNMENT);
		label.setBackground(new Color(172, 200, 230));
		label.setOpaque(true);
		topPanel.add(label, BorderLayout.CENTER);

		pin = new JLabel();
		pin.setIcon(stuck ? pinStuckIcon : pinNormalIcon);
		pin.addMouseListener(new MouseListener() {
			public void mouseClicked(MouseEvent e) {
			}

			public void mouseEntered(MouseEvent e) {
			}

			public void mouseExited(MouseEvent e) {
			}

			public void mousePressed(MouseEvent e) {
			}

			public void mouseReleased(MouseEvent e) {
				setStuck(!isStuck());
			}
		});

		pin.setAlignmentX(Component.LEFT_ALIGNMENT);
		pin.setBackground(new Color(172, 200, 230));
		pin.setOpaque(true);
		topPanel.add(pin, BorderLayout.EAST);

		contentPane = new JPanel();
		contentPane.setVisible(expanded);
		contentPane.setBorder(new EmptyBorder(4, 4, 4, 4));
		add(contentPane, BorderLayout.CENTER);
	}

	public JPanel getContentPane() {
		return contentPane;
	}

	public void setExpanded(boolean expanded, boolean interactive) {
		if(interactive && expanded && group != null) {
			for(JCollapsiblePanel panel : group) {
				if(panel == this || panel.isStuck()) {
					continue;
				}
				panel.setExpanded(false, false);
			}
		}
		contentPane.setVisible(expanded);
		label.setIcon(expanded ? expandedIcon : collapsedIcon);
	}

	public boolean isExpanded() {
		return contentPane.isVisible();
	}

	public void setGroup(JCollapsiblePanelGroup group) {
		this.group = group;
		group.add(this);
	}

	public void setStuck(boolean stuck) {
		this.stuck = stuck;
		pin.setIcon(stuck ? pinStuckIcon : pinNormalIcon);
	}

	public boolean isStuck() {
		return stuck;
	}

	public void setId(int id) {
		this.id = id;
	}

	public int getId() {
		return id;
	}

	public boolean isExpandedByDefault() {
		return expandedByDefault;
	}

	public boolean isStuckByDefault() {
		return stuckByDefault;
	}
}