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/*
* 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.AlphaComposite;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;

import javax.swing.JComponent;
import javax.swing.JScrollBar;
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);
  }
}