Source code file content

onyx / src / org / pushingpixels / onyx / CloseButton.java

/*
 * Copyright (c) 2009 Onyx Kirill Grouchnikov. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 *  o Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer. 
 *     
 *  o Redistributions in binary form must reproduce the above copyright notice, 
 *    this list of conditions and the following disclaimer in the documentation 
 *    and/or other materials provided with the distribution. 
 *     
 *  o Neither the name of Onyx Kirill Grouchnikov nor the names of 
 *    its contributors may be used to endorse or promote products derived 
 *    from this software without specific prior written permission. 
 *     
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */
package org.pushingpixels.onyx;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Ellipse2D;

import javax.swing.JButton;
import javax.swing.SwingUtilities;

import org.pushingpixels.trident.Timeline;
import org.pushingpixels.trident.callback.Repaint;

/**
 * The close button of the Onyx demo.
 * 
 * @author Kirill Grouchnikov
 */
public class CloseButton extends JButton {
	/**
	 * The alpha value of this button. Is updated in the fade-in timeline which
	 * starts when this button becomes a part of the host window hierarchy.
	 */
	float alpha;

	/**
	 * Creates a new close button.
	 */
	public CloseButton() {
		// mark the button as non-opaque since it will be
		// round shaped and translucent
		this.setOpaque(false);
		this.setForeground(Color.white);
		this.alpha = 0.0f;

		this.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				SwingUtilities.invokeLater(new Runnable() {
					@Override
					public void run() {
						// dispose the host window
						Window windowAncestor = SwingUtilities
								.getWindowAncestor(CloseButton.this);
						windowAncestor.dispose();
					}
				});
			}
		});

		// timeline for the rollover effect (interpolating the
		// button's foreground color)
		final Timeline rolloverTimeline = new Timeline(this);
		rolloverTimeline.addPropertyToInterpolate("foreground", Color.white,
				new Color(64, 140, 255));
		rolloverTimeline.setDuration(200);

		// and register a mouse listener to play the rollover
		// timeline
		this.addMouseListener(new MouseAdapter() {
			@Override
			public void mouseEntered(MouseEvent e) {
				rolloverTimeline.play();
			}

			@Override
			public void mouseExited(MouseEvent e) {
				rolloverTimeline.playReverse();
			}
		});

		// fade in the component once it's part of the window
		// hierarchy
		this.addHierarchyListener(new HierarchyListener() {
			@Override
			public void hierarchyChanged(HierarchyEvent e) {
				Timeline shownTimeline = new Timeline(CloseButton.this);
				shownTimeline.addPropertyToInterpolate("alpha", 0.0f, 1.0f);
				shownTimeline.addCallback(new Repaint(CloseButton.this));
				shownTimeline.setDuration(500);
				shownTimeline.play();
			}
		});
	}

	/**
	 * Sets the alpha value. Used by the fade-in timeline.
	 * 
	 * @param alpha
	 *            Alpha value for this button.
	 */
	public void setAlpha(float alpha) {
		this.alpha = alpha;
	}

	@Override
	protected void paintBorder(Graphics g) {
		// overriden to remove the default border painting
	}

	@Override
	protected void paintComponent(Graphics g) {
		Graphics2D g2d = (Graphics2D) g.create();

		g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
				RenderingHints.VALUE_ANTIALIAS_ON);

		// use the current alpha
		g2d.setComposite(AlphaComposite.SrcOver.derive(this.alpha));

		// paint the background - black fill and a dark outline
		// based on the current foreground color
		Shape contour = new Ellipse2D.Double(1, 1, getWidth() - 3,
				getHeight() - 3);
		g2d.setColor(Color.black);
		g2d.setStroke(new BasicStroke(2.0f));
		g2d.fill(contour);
		g2d.setColor(this.getForeground().darker().darker());
		g2d.draw(contour);

		// paint the outer cross (always white)
		g2d.setColor(Color.white);
		g2d.setStroke(new BasicStroke(6.0f, BasicStroke.CAP_ROUND,
				BasicStroke.JOIN_ROUND));
		int offset = getWidth() / 3;
		g2d.drawLine(offset, offset, getWidth() - offset - 1, getHeight()
				- offset - 1);
		g2d.drawLine(getWidth() - offset - 1, offset, offset, getHeight()
				- offset - 1);

		// paint the inner cross (using the current foreground color)
		g2d.setColor(this.getForeground());
		g2d.setStroke(new BasicStroke(4.2f, BasicStroke.CAP_ROUND,
				BasicStroke.JOIN_ROUND));
		g2d.drawLine(offset, offset, getWidth() - offset - 1, getHeight()
				- offset - 1);
		g2d.drawLine(getWidth() - offset - 1, offset, offset, getHeight()
				- offset - 1);

		g2d.dispose();
	}
}