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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.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;

import javax.swing.Icon;
import javax.swing.UIManager;

/**
 * @author Michael Hagen
 */
public abstract class XPScrollButton extends BaseScrollButton {

  public XPScrollButton(int direction, int width) {
    super(direction, width);
  }

  private Icon getUpArrowIcon() {
    if (UIManager.getLookAndFeel() instanceof AbstractLookAndFeel) {
      AbstractLookAndFeel laf = (AbstractLookAndFeel) UIManager.getLookAndFeel();
      return laf.getIconFactory().getUpArrowIcon();
    }
    return null;
  }

  private Icon getDownArrowIcon() {
    if (UIManager.getLookAndFeel() instanceof AbstractLookAndFeel) {
      AbstractLookAndFeel laf = (AbstractLookAndFeel) UIManager.getLookAndFeel();
      return laf.getIconFactory().getDownArrowIcon();
    }
    return null;
  }

  private Icon getLeftArrowIcon() {
    if (UIManager.getLookAndFeel() instanceof AbstractLookAndFeel) {
      AbstractLookAndFeel laf = (AbstractLookAndFeel) UIManager.getLookAndFeel();
      return laf.getIconFactory().getLeftArrowIcon();
    }
    return null;
  }

  private Icon getRightArrowIcon() {
    if (UIManager.getLookAndFeel() instanceof AbstractLookAndFeel) {
      AbstractLookAndFeel laf = (AbstractLookAndFeel) UIManager.getLookAndFeel();
      return laf.getIconFactory().getRightArrowIcon();
    }
    return null;
  }

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

  public void paint(Graphics g) {
    Graphics2D g2D = (Graphics2D) g;
    Composite savedComposite = g2D.getComposite();
    Paint savedPaint = g2D.getPaint();

    boolean isPressed = getModel().isPressed();
    boolean isRollover = getModel().isRollover();

    int width = getWidth();
    int height = getHeight();

    Color[] tc = AbstractLookAndFeel.getTheme().getThumbColors();
    Color c1 = tc[0];
    Color c2 = tc[tc.length - 1];
    if (isPressed) {
      c1 = ColorHelper.darker(c1, 5);
      c2 = ColorHelper.darker(c2, 5);
    }
    else if (isRollover) {
      c1 = ColorHelper.brighter(c1, 20);
      c2 = ColorHelper.brighter(c2, 20);
    }

    g2D.setPaint(new GradientPaint(0, 0, c1, width, height, c2));
    g.fillRect(0, 0, width, height);
    g2D.setPaint(savedPaint);

    g.setColor(getFrameColor());
    g.drawLine(1, 1, width - 2, 1);
    g.drawLine(1, 1, 1, height - 3);
    g.drawLine(width - 2, 1, 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);
    g2D.setColor(c2);
    g.drawLine(2, 2, width - 3, 2);
    g.drawLine(2, 3, 2, height - 3);

    g.setColor(ColorHelper.darker(c2, 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);

    g2D.setComposite(savedComposite);

    int x;
    int y;
    Icon icon;
    // paint the icon
    if (getDirection() == NORTH) {
      icon = getUpArrowIcon();
      x = (width / 2) - (icon.getIconWidth() / 2);
      y = (height / 2) - (icon.getIconHeight() / 2);
    }
    else if (getDirection() == SOUTH) {
      icon = getDownArrowIcon();
      x = (width / 2) - (icon.getIconWidth() / 2);
      y = (height / 2) - (icon.getIconHeight() / 2) + 1;
    }
    else if (getDirection() == WEST) {
      icon = getLeftArrowIcon();
      x = (width / 2) - (icon.getIconWidth() / 2);
      y = (height / 2) - (icon.getIconHeight() / 2);
    }
    else {
      icon = getRightArrowIcon();
      x = (width / 2) - (icon.getIconWidth() / 2) + 1;
      y = (height / 2) - (icon.getIconHeight() / 2);
    }
    icon.paintIcon(this, g, x, y);
  }

  public Dimension getPreferredSize() {
    if (getDirection() == NORTH) {
      return new Dimension(buttonWidth, buttonWidth);
    }
    else if (getDirection() == SOUTH) {
      return new Dimension(buttonWidth, buttonWidth);
    }
    else if (getDirection() == EAST) {
      return new Dimension(buttonWidth, buttonWidth);
    }
    else if (getDirection() == WEST) {
      return new Dimension(buttonWidth, buttonWidth);
    }
    else {
      return new Dimension(0, 0);
    }
  }
}