/*
 * Copyright (c) 2005-2008 Substance 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 Substance 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.jvnet.substance;

import java.awt.*;

import javax.swing.JComponent;
import javax.swing.UIManager;
import javax.swing.border.Border;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.UIResource;
import javax.swing.plaf.basic.BasicDesktopPaneUI;

import org.jvnet.lafwidget.layout.TransitionLayout;
import org.jvnet.substance.painter.utils.SubstanceFillBackgroundDelegate;
import org.jvnet.substance.utils.SubstanceCoreUtilities;
import org.jvnet.substance.utils.border.SubstanceBorder;

/**
 * UI for desktop panes in <b>Substance</b> look and feel.
 * 
 * @author Kirill Grouchnikov
 */
public class SubstanceDesktopPaneUI extends BasicDesktopPaneUI {
	/**
	 * Background delegate.
	 */
	private SubstanceFillBackgroundDelegate bgDelegate;

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.swing.plaf.ComponentUI#createUI(javax.swing.JComponent)
	 */
	public static ComponentUI createUI(JComponent comp) {
		SubstanceCoreUtilities.testComponentCreationThreadingViolation(comp);
		return new SubstanceDesktopPaneUI();
	}

	/**
	 * Simple constructor.
	 */
	private SubstanceDesktopPaneUI() {
		this.bgDelegate = new SubstanceFillBackgroundDelegate();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.swing.plaf.basic.BasicDesktopPaneUI#installDefaults()
	 */
	@Override
	protected void installDefaults() {
		super.installDefaults();
		Border curr = this.desktop.getBorder();
		if ((curr == null) || (curr instanceof UIResource)) {
			this.desktop.setBorder(new SubstanceBorder());
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.swing.plaf.ComponentUI#update(java.awt.Graphics,
	 * javax.swing.JComponent)
	 */
	@Override
	public void update(Graphics g, JComponent c) {
		if (!c.isShowing()) {
			return;
		}
		Graphics2D graphics = (Graphics2D) g.create();
		graphics.setComposite(TransitionLayout.getAlphaComposite(c, g));
		if (TransitionLayout.isOpaque(c)) {
			// hack for JLayeredPane.paint() and JDesktopPane.isOpaque()
			Color back = c.getBackground();
			if (back instanceof UIResource) {
				graphics.setColor(UIManager.getColor("Panel.background"));
				graphics.fillRect(0, 0, c.getWidth(), c.getHeight());
			}
			this.bgDelegate.updateIfOpaque(graphics, c);
			super.paint(graphics, c);
		} else {
			super.paint(graphics, c);
		}
		// graphics.setColor(UIManager.getColor("Desktop.foreground"));
		// graphics.drawRect(0, 0, c.getWidth() - 1, c.getHeight() - 1);
		graphics.dispose();

		// GhostPaintingUtils.paintGhostImages(c, g);
	}
}
