swingx-master/swingx-core/src/main/java/org/jdesktop/swingx/plaf/misc/GlossyTaskPaneUI.java
/*
 * $Id$
 *
 * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.jdesktop.swingx.plaf.misc;

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

import javax.swing.JComponent;
import javax.swing.border.Border;
import javax.swing.plaf.ComponentUI;

import org.jdesktop.swingx.JXTaskPane;
import org.jdesktop.swingx.plaf.basic.BasicTaskPaneUI;

/**
 * Paints the JXTaskPane with a gradient in the title bar.
 * 
 * @author <a href="mailto:fred@L2FProd.com">Frederic Lavigne</a>
 */
public class GlossyTaskPaneUI extends BasicTaskPaneUI {

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

  @Override
  protected Border createPaneBorder() {
    return new GlossyPaneBorder();
  }
  
  /**
   * Overriden to paint the background of the component but keeping the rounded
   * corners.
   */
  @Override
  public void update(Graphics g, JComponent c) {
    if (c.isOpaque()) {
      g.setColor(c.getParent().getBackground());
      g.fillRect(0, 0, c.getWidth(), c.getHeight());
      g.setColor(c.getBackground());
      g.fillRect(0, getRoundHeight(), c.getWidth(), c.getHeight() - getRoundHeight());
    }
    paint(g, c);
  }

  /**
   * The border of the taskpane group paints the "text", the "icon", the
   * "expanded" status and the "special" type.
   *  
   */
  class GlossyPaneBorder extends PaneBorder {
    
    @Override
    protected void paintTitleBackground(JXTaskPane group, Graphics g) {
      if (group.isSpecial()) {
        g.setColor(specialTitleBackground);
        g.fillRoundRect(
          0,
          0,
          group.getWidth(),
          getRoundHeight() * 2,
          getRoundHeight(),
          getRoundHeight());
        g.fillRect(
          0,
          getRoundHeight(),
          group.getWidth(),
          getTitleHeight(group) - getRoundHeight());
      } else {
        Paint oldPaint = ((Graphics2D)g).getPaint();
        GradientPaint gradient =
          new GradientPaint(
            0f,
            0f, //group.getWidth() / 2,
            titleBackgroundGradientStart,
            0f, //group.getWidth(),
            getTitleHeight(group),
            titleBackgroundGradientEnd);
                
        ((Graphics2D)g).setRenderingHint(
          RenderingHints.KEY_COLOR_RENDERING,
          RenderingHints.VALUE_COLOR_RENDER_QUALITY);
        ((Graphics2D)g).setRenderingHint(
          RenderingHints.KEY_INTERPOLATION,
          RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        ((Graphics2D)g).setRenderingHint(
          RenderingHints.KEY_RENDERING,
          RenderingHints.VALUE_RENDER_QUALITY);
        ((Graphics2D)g).setPaint(gradient);
        
        g.fillRoundRect(
          0,
          0,
          group.getWidth(),
          getRoundHeight() * 2,
          getRoundHeight(),
          getRoundHeight());
        g.fillRect(
          0,
          getRoundHeight(),
          group.getWidth(),
          getTitleHeight(group) - getRoundHeight());
        ((Graphics2D)g).setPaint(oldPaint);
      }
      
      g.setColor(borderColor);
      g.drawRoundRect(
        0,
        0,
        group.getWidth() - 1,
        getTitleHeight(group) + getRoundHeight(),
        getRoundHeight(),
        getRoundHeight());
      g.drawLine(0, getTitleHeight(group) - 1, group.getWidth(), getTitleHeight(group) - 1);
    }

    @Override
    protected void paintExpandedControls(JXTaskPane group, Graphics g, int x,
      int y, int width, int height) {
      ((Graphics2D)g).setRenderingHint(
        RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);
      
      paintOvalAroundControls(group, g, x, y, width, height);
      g.setColor(getPaintColor(group));
      paintChevronControls(group, g, x, y, width, height);
      
      ((Graphics2D)g).setRenderingHint(
        RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_OFF);
    }

    @Override
    protected boolean isMouseOverBorder() {
      return true;
    }

  }

}
