TaskPanel.java

/*
 * Copyright (c) 2014 tabletoptool.com team.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     rptools.com team - initial implementation
 *     tabletoptool.com team - further development
 */
package com.t3.swing;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.IOException;

import javax.swing.BorderFactory;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;

import com.t3.image.ImageUtil;

public class TaskPanel extends JPanel {

	private static final Color DEFAULT_TOP_COLOR = new Color(191, 197, 255);
	private static final Color DEFAULT_BOTTOM_COLOR = new Color(175, 185, 255);
	
	private Color topColor = DEFAULT_TOP_COLOR;
	private Color bottomColor = DEFAULT_BOTTOM_COLOR;

	public enum State {
        OPEN,
        CLOSED
    }

	public void setTopColor(Color color) {
		topColor = color;
		repaint();
	}
	
	public void setBottomColor(Color color) {
		bottomColor = color;
		repaint();
	}
	
    public static final String TASK_PANEL_STATE = "taskPanel.state";
    
    private static Icon closeIcon;
    private static Icon openIcon;

    static {
    	try {
	    	closeIcon = new ImageIcon(ImageUtil.getImage("com/t3/swing/image/collapse.png"));
	    	openIcon  = new ImageIcon(ImageUtil.getImage("com/t3/swing/image/expand.png"));
    	} catch (IOException ioe) {
    		ioe.printStackTrace();
    	}
    }
    
    private State state;
    private JPanel contentPanel;
    private JLabel toggleButton;
    private String title;
    
    public TaskPanel (String title, Component component) {

    	this.title = title;
    	
        setLayout(new BorderLayout());
        add(BorderLayout.NORTH, createTitlePanel(title));
        add(BorderLayout.CENTER, getContentPanel(component));
        
        setState (State.OPEN);
    }
    
    public String getTitle() {
    	return title;
    }

    public void toggleState() {
        setState(state == State.OPEN ? State.CLOSED : State.OPEN);
    }
    
    public void setState(State state) {
    	State oldState = this.state;
        this.state = state;
        contentPanel.setVisible(state == State.OPEN);
        toggleButton.setIcon(state != State.OPEN ? openIcon : closeIcon);

        firePropertyChange(TASK_PANEL_STATE, oldState, state);
        
        doLayout();
        invalidate();
        repaint();
    }

    public boolean isOpen() {
        return state == State.OPEN;
    }
    
    public State getState() {
        return state;
    }
    
    private JPanel getContentPanel(Component component) {
        
        if (contentPanel == null ) {
            contentPanel = new JPanel(new BorderLayout());
            contentPanel.add(BorderLayout.CENTER, component);
            //contentPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

        }
        
        return contentPanel;
    }
    
    private JPanel createTitlePanel(String title) {
        
        //JPanel panel = new GradientPanel(new Color(0, 0, 100), Color.lightGray, new GridBagLayout()) {
        JPanel panel = new JPanel(new GridBagLayout()) {
        	@Override
        	protected void paintComponent(Graphics g) {
        		super.paintComponent(g);

        		Dimension size = getSize();
        		
        		g.setColor(topColor);
        		g.fillRect(0, 0, size.width, size.height/2);
        		
        		//((Graphics2D)g).setPaint(new GradientPaint(0, size.height/2, TOP_COLOR, 0, size.height, BOTTOM_COLOR));
        		g.setColor(bottomColor);
        		g.fillRect(0, size.height/2, size.width, size.height/2);
        		
        		g.setColor(Color.gray);
        		g.drawLine(0, 0, size.width, 0);
        		g.drawLine(0, 0, 0, size.height);
        		g.drawLine(size.width-1, 0, size.width-1, size.height);
        		g.drawLine(0, size.height-1, size.width-1, size.height-1);

        	}
        };
        panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 5));
        GridBagConstraints constraints = new GridBagConstraints();
        
        constraints.gridx = 1;
        panel.add(createButtonPanel(), constraints);
        
        constraints.gridx = 0;
        constraints.weightx = 1;
        constraints.fill = GridBagConstraints.BOTH;
        
        JLabel titleLabel = new JLabel(title);
        panel.add(titleLabel, constraints);
        
        return panel;
    }

    private JPanel createButtonPanel() {
        
        JPanel panel = new JPanel();
        panel.setOpaque(false);
        panel.add(getToggleButton());
        
        return panel;
    }
    
    private JLabel getToggleButton() {
        if (toggleButton == null) {
            toggleButton = new JLabel(closeIcon);
            toggleButton.addMouseListener(new MouseAdapter() {
                @Override
				public void mouseClicked(MouseEvent e) {
                    toggleState();
                }
            });
        }
        
        return toggleButton;
    }
}