001/*
002 * $Id: ShadingColorHighlighter.java 3100 2008-10-14 22:33:10Z rah003 $
003 *
004 * Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
005 * Santa Clara, California 95054, U.S.A. All rights reserved.
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 * 
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
015 * Lesser General Public License for more details.
016 * 
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this library; if not, write to the Free Software
019 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
020 */
021package org.jdesktop.swingx.decorator;
022
023import java.awt.Color;
024import java.awt.Component;
025
026/**
027 * Experimental replacement of HierarchicalColumnHighligher.
028 * Darkens the component's background.
029 * 
030 * @author Jeanette Winzenburg
031 */
032public class ShadingColorHighlighter extends ColorHighlighter {
033
034    /**
035     * Instantiates a Highlighter with null colors using the default 
036     * HighlightPredicate.
037     * 
038     */
039    public ShadingColorHighlighter() {
040        this(null);
041    }
042
043    /**
044     * Instantiates a Highlighter with null colors using the specified 
045     * HighlightPredicate.
046     * 
047     * @param predicate the HighlightPredicate to use.
048     */
049    public ShadingColorHighlighter(HighlightPredicate predicate) {
050        super(predicate, null, null);
051    }
052
053    /**
054     * Applies a suitable background for the renderer component within the
055     * specified adapter. <p>
056     * 
057     * This implementation applies its a darkened background to an unselected
058     * adapter. Does nothing for selected cells.
059     *
060     * @param renderer the cell renderer component that is to be decorated
061     * @param adapter the ComponentAdapter for this decorate operation
062     */
063    @Override
064    protected void applyBackground(Component renderer, ComponentAdapter adapter) {
065        if (adapter.isSelected())
066            return;
067        // PENDING JW: really? That would be applying a absolute color, instead
068        // of shading whatever the renderer has.
069        Color background = getBackground();
070        if (background == null) {
071            background = renderer.getBackground();
072        }
073        // Change to the following
074//        Color background = renderer.getBackground();
075        if (background != null) {
076            renderer.setBackground(computeBackgroundSeed(background));
077        }
078    }
079
080    protected Color computeBackgroundSeed(Color seed) {
081        return new Color(Math.max((int) (seed.getRed() * 0.95), 0), Math.max(
082                (int) (seed.getGreen() * 0.95), 0), Math.max((int) (seed
083                .getBlue() * 0.95), 0));
084    }
085
086}