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/***********************************************************************************************************************
 *
 * SolidBlue - open source safe data
 * Copyright (C) 2011-2011 by Tidalwave s.a.s. (http://www.tidalwave.it)
 *
 ***********************************************************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations under the License.
 *
 ***********************************************************************************************************************
 *
 * WWW: http://solidblue.java.net
 * SCM: https://bitbucket.org/tidalwave/solidblue-src
 *
 **********************************************************************************************************************/
package it.tidalwave.netbeans.lookandfeel.ui;

import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import javax.swing.JComponent;
import javax.swing.plaf.basic.BasicPanelUI;
import org.openide.windows.TopComponent;
import org.openide.windows.TopComponent.Registry;
import org.openide.windows.WindowManager;

/*******************************************************************************
 *
 * @author  Fabrizio Giudici
 * @version $Id$
 *
 ******************************************************************************/
public class HeaderPanelUI extends BasicPanelUI
  {
    public static final String HEADER_PANEL_CP = HeaderPanelUI.class.getName();
    
    private static HeaderPanelUI instance;
    
    private static Registry registry;

    /***************************************************************************
     *
     *
     **************************************************************************/
    public static HeaderPanelUI createUI (final JComponent component) 
      {
    	if (instance == null)
          {
            instance = new HeaderPanelUI();
          }
        
        component.putClientProperty(HEADER_PANEL_CP, true);
        return instance;
      }    
    
    /***************************************************************************
     *
     *
     **************************************************************************/
    @Override
    public void paint (final Graphics g, final JComponent component) 
      {
        final Graphics2D g2 = (Graphics2D)g;
        Color baseColor = component.getBackground();
        
        if (!isInActivatedTopComponent(component))
          {
            baseColor = variant(baseColor, 0.7);
          }
        
        final Color color1 = variant(baseColor, 1.0 / 0.88);
        final Color color2 = variant(baseColor, 0.88);
        final GradientPaint gradientPaint = new GradientPaint(0, 0, color1, 0, component.getHeight(), color2);
        
        final Paint savePaint = g2.getPaint();
        g2.setPaint(gradientPaint);
        g2.fillRect(0, 0, component.getWidth(), component.getHeight());
        g2.setPaint(savePaint);
      }
    
    /***************************************************************************
     *
     *
     **************************************************************************/
    public static Color variant (final Color color, final double factor) 
      {
        return new Color(Math.min((int)(color.getRed() * factor), 255),
                         Math.min((int)(color.getGreen() * factor), 255),
                         Math.min((int)(color.getBlue() * factor), 255));
      }
    
    /***************************************************************************
     *
     *
     **************************************************************************/
    public static boolean isInActivatedTopComponent (final JComponent component)
      {
        if (registry == null)
          {
            registry = WindowManager.getDefault().getRegistry();
          }
        
        return registry.getActivated() == findTopComponent(component);
      }

    /***************************************************************************
     *
     *
     **************************************************************************/
    private static TopComponent findTopComponent (final Component component)
      {
        if (component instanceof TopComponent)
          {
            return (TopComponent)component;  
          }
        
        final Container parent = component.getParent();
        
        return (parent != null) ? findTopComponent(parent) : null;
      }
  }