Source code file content

onyx / src / org / pushingpixels / onyx / AlbumOverviewComponent.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.HierarchyEvent;
import java.awt.event.HierarchyListener;
import java.awt.image.BufferedImage;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.swing.*;

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

import com.ECS.client.jax.Item;

/**
 * Displays the overview information on the specific album.
 * 
 * @author Kirill Grouchnikov
 */
public class AlbumOverviewComponent extends JComponent {
	/**
	 * The dimensions of the overview image.
	 */
	public static final int OVERVIEW_IMAGE_DIM = 100;

	/**
	 * The original album art.
	 */
	private BufferedImage image;

	/**
	 * Indicates whether the image loading is done.
	 */
	private boolean imageLoadedDone;

	/**
	 * The alpha value of the image. Is updated in the fade-in timeline which
	 * starts after the image has been successfully loaded and scaled.
	 */
	private float imageAlpha;

	/**
	 * The album caption.
	 */
	private String caption;

	/**
	 * The album price.
	 */
	private String price;

	/**
	 * The alpha value of this component. Is updated in the fade-in timeline
	 * which starts when this component becomes a part of the host window
	 * hierarchy.
	 */
	private float alpha;

	/**
	 * Component insets.
	 */
	private static final int INSETS = 7;

	/**
	 * Default width of this component.
	 */
	public static final int DEFAULT_WIDTH = 160;

	/**
	 * Default height of this component.
	 */
	public static final int DEFAULT_HEIGHT = 180;

	/**
	 * Creates a new component that shows overview informartion on the specified
	 * album.
	 * 
	 * @param albumItem
	 *            Information on an album.
	 */
	public AlbumOverviewComponent(final Item albumItem) {
		this.caption = albumItem.getItemAttributes().getTitle();
		this.price = albumItem.getItemAttributes().getListPrice()
				.getFormattedPrice();
		this.imageLoadedDone = false;
		this.imageAlpha = 0.0f;

		this.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
		this.setOpaque(false);
		this.alpha = 0.0f;

		this.addHierarchyListener(new HierarchyListener() {
			@Override
			public void hierarchyChanged(HierarchyEvent e) {
				Timeline shownTimeline = new Timeline(
						AlbumOverviewComponent.this);
				shownTimeline.addPropertyToInterpolate("alpha", 0.0f, 1.0f);
				shownTimeline.addCallback(new Repaint(
						AlbumOverviewComponent.this));
				shownTimeline.setDuration(1000);
				shownTimeline.play();
			}
		});

		SwingUtilities.invokeLater(new Runnable() {
			@Override
			public void run() {
				getLoadImageScenario(albumItem).play();
			}
		});
	}

	/**
	 * Returns the timeline scenario that loads, scaled and fades in the
	 * associated album art.
	 * 
	 * @param albumItem
	 *            Album item.
	 * @return The timeline scenario that loads, scaled and fades in the
	 *         associated album art.
	 */
	private TimelineScenario getLoadImageScenario(final Item albumItem) {
		TimelineScenario loadScenario = new TimelineScenario.Sequence();

		// load the image
		TimelineSwingWorker<Void, Void> imageLoadWorker = new TimelineSwingWorker<Void, Void>() {
			@Override
			protected Void doInBackground() throws Exception {
				URL url = new URL(albumItem.getMediumImage().getURL());
				image = ImageIO.read(url);
				return null;
			}
		};
		loadScenario.addScenarioActor(imageLoadWorker);

		// scale if necessary
		TimelineRunnable scaler = new TimelineRunnable() {
			@Override
			public void run() {
				if (image != null) {
					float vFactor = (float) OVERVIEW_IMAGE_DIM
							/ (float) image.getHeight();
					float hFactor = (float) OVERVIEW_IMAGE_DIM
							/ (float) image.getWidth();
					float factor = Math.min(1.0f, Math.min(vFactor, hFactor));
					if (factor < 1.0f) {
						// scaled to fit available area
						image = OnyxUtils.getScaledInstance(image,
								(int) (factor * image.getWidth()),
								(int) (factor * image.getHeight()),
								RenderingHints.VALUE_INTERPOLATION_BICUBIC,
								true);
					}

					imageLoadedDone = true;
				}
			}
		};
		loadScenario.addScenarioActor(scaler);

		// and fade it in
		Timeline imageFadeInTimeline = new Timeline(AlbumOverviewComponent.this);
		imageFadeInTimeline.addPropertyToInterpolate("imageAlpha", 0.0f, 1.0f);
		imageFadeInTimeline
				.addCallback(new Repaint(AlbumOverviewComponent.this));
		imageFadeInTimeline.setDuration(500);
		loadScenario.addScenarioActor(imageFadeInTimeline);

		return loadScenario;
	}

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

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

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

		g2d.setComposite(AlphaComposite.SrcOver.derive(this.alpha));

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

		g2d.setPaint(new GradientPaint(0, 0, new Color(0, 0, 0, 196), 0,
				DEFAULT_HEIGHT, new Color(0, 0, 0, 0)));
		g2d.fillRoundRect(0, 0, DEFAULT_WIDTH, DEFAULT_HEIGHT, 18, 18);
		g2d.drawRoundRect(0, 0, DEFAULT_WIDTH, DEFAULT_HEIGHT, 18, 18);

		if (this.imageLoadedDone) {
			Graphics2D g2dImage = (Graphics2D) g2d.create();
			g2dImage.setComposite(AlphaComposite.SrcOver.derive(this.alpha
					* this.imageAlpha));
			// draw the album art image
			g2dImage.drawImage(this.image, (this.getWidth() - this.image
					.getWidth()) / 2, INSETS
					+ (OVERVIEW_IMAGE_DIM - this.image.getHeight()) / 2, null);
			g2dImage.dispose();
		}

		g2d.setColor(Color.white);
		g2d.setFont(UIManager.getFont("Label.font").deriveFont(11.0f));

		FontMetrics fontMetrics = g2d.getFontMetrics();
		int textY = INSETS + OVERVIEW_IMAGE_DIM + fontMetrics.getHeight();
		int textX = INSETS;
		int textWidth = DEFAULT_WIDTH - INSETS - textX;
		OnyxUtils.paintMultilineText(g2d, this.caption, textX, textWidth,
				textY, 2);

		g2d.setColor(new Color(64, 140, 255));
		OnyxUtils.paintMultilineText(g2d, this.price, textX, textWidth, textY
				+ 2 * g2d.getFontMetrics().getAscent(), 1);

		g2d.dispose();
	}
}