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The Kunststoff Look and Feel is an extension to the the Java ™ Metal Look and Feel. This makes it very compact in size (approx. 43 kBytes) and ensures that all the great features provided by the Metal Look and Feel do not get lost. It is our little contribution for making the Java ™ platform even better and we hope that it will help you make some wonderful GUIs.

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package com.incors.plaf.kunststoff;

/*
 * This code was developed by INCORS GmbH (www.incors.com).
 * It is published under the terms of the GNU Lesser General Public License.
 */

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

public class KunststoffScrollBarUI extends MetalScrollBarUI {

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

  protected JButton createDecreaseButton(int orientation) {
    decreaseButton = new KunststoffScrollButton(orientation, scrollBarWidth, isFreeStanding);
    return decreaseButton;
  }

  protected JButton createIncreaseButton(int orientation) {
    increaseButton =  new KunststoffScrollButton(orientation, scrollBarWidth, isFreeStanding);
    return increaseButton;
  }


  /**
   * Calls the super classes paint(Graphics g) method and then paints two gradients.
   * The direction of the gradients depends on the direction of the scrollbar.
   */
  protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) {
    super.paintThumb(g, c, thumbBounds);

    // colors for the reflection gradient
    Color colorReflection = KunststoffLookAndFeel.getComponentGradientColorReflection();
    Color colorReflectionFaded = KunststoffUtilities.getTranslucentColor(colorReflection, 0);
    // colors for the shadow gradient
    Color colorShadow = KunststoffLookAndFeel.getComponentGradientColorShadow();
    Color colorShadowFaded = KunststoffUtilities.getTranslucentColor(colorShadow, 0);

    Rectangle rectReflection;  // rectangle for the reflection gradient
    Rectangle rectShadow;  // rectangle for the shadow gradient
    if (scrollbar.getOrientation() == JScrollBar.VERTICAL) {
      rectReflection = new Rectangle(thumbBounds.x+1, thumbBounds.y, thumbBounds.width/2, thumbBounds.height);
      rectShadow = new Rectangle(thumbBounds.x + thumbBounds.width/2, thumbBounds.y, thumbBounds.width/2+1, thumbBounds.height);
    } else {
      rectReflection = new Rectangle(thumbBounds.x, thumbBounds.y+1, thumbBounds.width, thumbBounds.height/2);
      rectShadow = new Rectangle(thumbBounds.x, thumbBounds.y + thumbBounds.height/2, thumbBounds.width, thumbBounds.height/2+1);
    }

    // the direction of the gradient is orthogonal to the direction of the scrollbar
    boolean isVertical = (scrollbar.getOrientation() == JScrollBar.HORIZONTAL);
    KunststoffUtilities.drawGradient(g, colorReflection, colorReflectionFaded, rectReflection, isVertical);
    KunststoffUtilities.drawGradient(g, colorShadowFaded, colorShadow, rectShadow, isVertical);
  }

}