001    /*
002     * $Id: HierarchicalColumnHighlighter.java,v 1.3 2005/11/18 11:53:12 kleopatra Exp $
003     *
004     * Copyright 2004 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     */
021    
022    package org.jdesktop.swingx.decorator;
023    
024    import java.awt.Color;
025    import java.awt.Component;
026    
027    /**
028     * HierarchicalColumnHighlighter
029     *
030     * @author Ramesh Gupta
031     */
032    public class HierarchicalColumnHighlighter extends Highlighter {
033        public HierarchicalColumnHighlighter() {
034        }
035    
036        public HierarchicalColumnHighlighter(Color background, Color foreground) {
037            super(background, foreground);
038        }
039    
040        protected Color computeBackground(Component component, ComponentAdapter adapter) {
041            if (adapter.isHierarchical()) {
042                Color background = getBackground();
043                Color seed = background == null ? component.getBackground() : background;
044                seed = computeBackgroundSeed(seed);
045                return adapter.isSelected() ? computeSelectedBackground(seed) : seed;
046            }
047            return null;    // don't change the background
048        }
049    
050        protected Color computeBackgroundSeed(Color seed) {
051            return new Color(Math.max((int)(seed.getRed()  * 0.95), 0),
052                             Math.max((int)(seed.getGreen()* 0.95), 0),
053                             Math.max((int)(seed.getBlue() * 0.95), 0));
054        }
055    }