Source code file content

onyx / src / org / pushingpixels / onyx / content / Stage0Base.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.content;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.RoundRectangle2D;

import javax.swing.JComponent;
import javax.swing.SwingUtilities;

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

/**
 * The basis of the album scroller container. Provides the functionality of:
 * 
 * <ul>
 * <li>Fading in once it becomes a part of the host window hierarchy</li>
 * <li>Dragging the host window with the mouse</li>
 * <li>Painting a rounded translucent background</li>
 * </ul>
 * 
 * @author Kirill Grouchnikov
 */
public class Stage0Base extends JComponent {
	/**
	 * The alpha value for this container. Is updated in the fade-in timeline
	 * which starts when this container becomes a part of the host window
	 * hierarchy.
	 */
	float alpha;

	/**
	 * Creates the basic container.
	 */
	public Stage0Base() {
		this.setOpaque(false);
		this.alpha = 0.0f;

		// mouse listener for dragging the host window
		MouseAdapter adapter = new MouseAdapter() {
			int lastX;
			int lastY;

			@Override
			public void mousePressed(MouseEvent e) {
				Component source = (Component) e.getSource();

				Point eventLocationOnScreen = e.getLocationOnScreen();
				if (eventLocationOnScreen == null) {
					eventLocationOnScreen = new Point(e.getX()
							+ source.getLocationOnScreen().x, e.getY()
							+ source.getLocationOnScreen().y);
				}

				lastX = eventLocationOnScreen.x;
				lastY = eventLocationOnScreen.y;
			}

			@Override
			public void mouseDragged(MouseEvent e) {
				Component source = (Component) e.getSource();

				Point eventLocationOnScreen = e.getLocationOnScreen();
				if (eventLocationOnScreen == null) {
					eventLocationOnScreen = new Point(e.getX()
							+ source.getLocationOnScreen().x, e.getY()
							+ source.getLocationOnScreen().y);
				}

				int dx = eventLocationOnScreen.x - lastX;
				int dy = eventLocationOnScreen.y - lastY;
				Window win = SwingUtilities.getWindowAncestor(Stage0Base.this);
				Point loc = win.getLocation();
				win.setLocation(loc.x + dx, loc.y + dy);
				lastX = eventLocationOnScreen.x;
				lastY = eventLocationOnScreen.y;
			}
		};
		this.addMouseListener(adapter);
		this.addMouseMotionListener(adapter);

		// fade in the container once it's part of the window
		// hierarchy
		this.addHierarchyListener(new HierarchyListener() {
			@Override
			public void hierarchyChanged(HierarchyEvent e) {
				Timeline shownTimeline = new Timeline(Stage0Base.this);
				shownTimeline.addPropertyToInterpolate("alpha", 0.0f, 0.75f);
				shownTimeline.addCallback(new Repaint(Stage0Base.this));
				shownTimeline.setDuration(500);
				shownTimeline.play();
			}
		});
	}

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

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

		g2d.setStroke(new BasicStroke(1.0f));
		g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
				RenderingHints.VALUE_ANTIALIAS_ON);

		int radius = 32;
		Shape contour = new RoundRectangle2D.Double(0, 0, getWidth() - 1,
				getHeight() - 1, radius, radius);
		g2d.setComposite(AlphaComposite.SrcOver.derive(this.alpha));
		g2d.setColor(new Color(0, 0, 0));
		g2d.fill(contour);
		g2d.setColor(Color.gray);
		g2d.draw(contour);

		g2d.dispose();
	}
}