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A LookAndFeel library for swing
There is a newer version: 1.6.13
/*
* Copyright (c) 2002 and later by MH Software-Entwicklung. All Rights Reserved.
*  
* JTattoo is multiple licensed. If your are an open source developer you can use
* it under the terms and conditions of the GNU General Public License version 2.0
* or later as published by the Free Software Foundation.
*  
* see: gpl-2.0.txt
* 
* If you pay for a license you will become a registered user who could use the
* software under the terms and conditions of the GNU Lesser General Public License
* version 2.0 or later with classpath exception as published by the Free Software
* Foundation.
* 
* see: lgpl-2.0.txt
* see: classpath-exception.txt
* 
* Registered users could also use JTattoo under the terms and conditions of the 
* Apache License, Version 2.0 as published by the Apache Software Foundation.
*  
* see: APACHE-LICENSE-2.0.txt
*/

package com.jtattoo.plaf;

import java.awt.*;
import javax.swing.*;
import javax.swing.plaf.ComponentUI;

/**
 *
 * @author  Michael Hagen
 */
public class XPScrollBarUI extends BaseScrollBarUI {

    protected static Color rolloverColors[] = null;
    protected static Color dragColors[] = null;

    public static ComponentUI createUI(JComponent c) {
        return new XPScrollBarUI();
    }

    protected void installDefaults() {
        super.installDefaults();
        Color colors[] = AbstractLookAndFeel.getTheme().getThumbColors();
        rolloverColors = new Color[colors.length];
        dragColors = new Color[colors.length];
        for (int i = 0; i < colors.length; i++) {
            rolloverColors[i] = ColorHelper.brighter(colors[i], 16);
            dragColors[i] = ColorHelper.darker(colors[i], 8);
        }
    }

    protected Color getFrameColor() {
        return Color.white;
    }

    protected Color[] getThumbColors() {
        if (isDragging) {
            return dragColors;
        }
        if (isRollover) {
            return rolloverColors;
        }
        return AbstractLookAndFeel.getTheme().getThumbColors();
    }

    protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) {
        if (!c.isEnabled()) {
            return;
        }

        Graphics2D g2D = (Graphics2D) g;
        Composite savedComposite = g2D.getComposite();

        int x = thumbBounds.x;
        int y = thumbBounds.y;
        int width = thumbBounds.width;
        int height = thumbBounds.height;

        g.translate(x, y);

        Color[] colors = getThumbColors();
        if (scrollbar.getOrientation() == JScrollBar.VERTICAL) {
            JTattooUtilities.fillVerGradient(g, colors, 0, 0, width, height);
            if (!AbstractLookAndFeel.getTheme().isMacStyleScrollBarOn()) {
                int dx = 6;
                int dy = height / 2 - 3;
                int dw = width - 13;
                Color c1 = ColorHelper.brighter(colors[0], 60);
                Color c2 = ColorHelper.darker(colors[0], 30);
                AlphaComposite alpha = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.6f);
                g2D.setComposite(alpha);
                for (int i = 0; i < 4; i++) {
                    g.setColor(c1);
                    g.drawLine(dx, dy, dx + dw, dy);
                    dy++;
                    g.setColor(c2);
                    g.drawLine(dx, dy, dx + dw, dy);
                    dy++;
                }
            }
        } else {
            JTattooUtilities.fillHorGradient(g, colors, 0, 0, width, height);
            if (!AbstractLookAndFeel.getTheme().isMacStyleScrollBarOn()) {
                int dx = width / 2 - 3;
                int dy = 6;
                int dh = height - 13;
                Color c1 = ColorHelper.brighter(colors[0], 60);
                Color c2 = ColorHelper.darker(colors[0], 30);
                AlphaComposite alpha = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.8f);
                g2D.setComposite(alpha);
                for (int i = 0; i < 4; i++) {
                    g.setColor(c1);
                    g.drawLine(dx, dy, dx, dy + dh);
                    dx++;
                    g.setColor(c2);
                    g.drawLine(dx, dy, dx, dy + dh);
                    dx++;
                }
            }
        }

        g.setColor(getFrameColor());
        g.drawLine(1, 1, width - 2, 1);
        g.drawLine(1, 2, 1, height - 3);
        g.drawLine(width - 2, 2, width - 2, height - 3);
        g.drawLine(2, height - 2, width - 3, height - 2);

        AlphaComposite alpha = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f);
        g2D.setComposite(alpha);
        Color fc = colors[colors.length - 1];
        g2D.setColor(fc);
        g.drawLine(2, 2, width - 3, 2);
        g.drawLine(2, 3, 2, height - 3);

        g.setColor(ColorHelper.darker(fc, 40));
        g.drawLine(width - 1, 2, width - 1, height - 3);
        g.drawLine(3, height - 1, width - 3, height - 1);
        alpha = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.2f);
        g2D.setComposite(alpha);
        g.drawLine(1, height - 2, 2, height - 1);
        g.drawLine(width - 1, height - 2, width - 2, height - 1);

        g.translate(-x, -y);
        g2D.setComposite(savedComposite);
    }
}