/*
    * #%L
    * JRst :: Api
    * %%
    * Copyright (C) 2004 - 2010 CodeLutin
    * %%
    * This program 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 3 of the 
   * License, or (at your option) any later version.
   * 
   * This program 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 General Lesser Public License for more details.
   * 
   * You should have received a copy of the GNU General Lesser Public 
   * License along with this program.  If not, see
   * <http://www.gnu.org/licenses/lgpl-3.0.html>.
   * #L%
   */
  
  package org.nuiton.jrst;
  
  import java.awt.Color;
  import java.awt.Dimension;
  import java.awt.FontMetrics;
  import java.awt.Graphics2D;
  import java.awt.Rectangle;
  import java.awt.RenderingHints;
  import java.awt.event.AdjustmentEvent;
  import java.awt.event.AdjustmentListener;
  import java.beans.PropertyChangeEvent;
  import java.beans.PropertyChangeListener;
  
  import javax.swing.JLabel;
  import javax.swing.JScrollPane;
  import javax.swing.text.JTextComponent;
  
  import org.junit.Ignore;
  
  /**
   * A class which adds line numbering to a editor
   * 
   * @author Yves Zoundi
   */
  @Ignore
  public final class GutterColor extends JLabel {
      /** serialVersionUID */
      private static final long serialVersionUID = -4419253280014127529L;
  
      private JTextComponent edit;
      private int rhWidth = 40;
      boolean[] bColors;
  
      /**
       * 
       * @param edit
       *            the editor which has to display line numbers
       * @param pane 
       * @param bColors 
       */
      public GutterColor(JTextComponent edit, JScrollPane pane, boolean[] bColors) {
          this.edit = edit;
          this.bColors = bColors;
          // listen for font change
          edit.addPropertyChangeListener(new PropertyChangeListener() {
              public void propertyChange(PropertyChangeEvent evt) {
                  if (evt.getPropertyName().equals("font")) {
                      revalidate();
                      repaint();
                  }
              }
          });
  
          setBackground(Color.GRAY);
          setForeground(Color.GRAY.darker());
  
          pane.getVerticalScrollBar().addAdjustmentListener(
                  new AdjustmentListener() {
                      public void adjustmentValueChanged(AdjustmentEvent e) {
                          revalidate();
                          repaint();
                      }
                  });
      }
  
      /**
       * 
       * @return The preferred size of the line numbering column
       */
      public Dimension getPreferredSize() {
          FontMetrics fm = edit.getFontMetrics(edit.getFont());
          int h = fm.getHeight();
          int w = fm.stringWidth(String.valueOf(edit.getHeight() / h)) + 6;
  
          rhWidth = w;
          int hi = (int) edit.getPreferredSize().getHeight();
          return new Dimension(w, hi);
     }
 
     /**
      * 
      * @param g
      *            A graphic component
      */
     public void paintComponent(java.awt.Graphics g) {
         super.paintComponent(g);
 
         Graphics2D g2d = (Graphics2D) g;
         g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
                 RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);
 
         g2d.setFont(edit.getFont());
         FontMetrics fm = g2d.getFontMetrics();
 
         Rectangle rec = edit.getVisibleRect();
 
         int h = fm.getHeight();
         int row = rec.y / h;
         int i = h - fm.getDescent();
         i += h * row;
         int max = row + (rec.height / h) + 2;
 
         boolean doWhite = false;
         while (row < max) {
             String s = Integer.toString(row + 1) + "  ";
             boolean white = false;
             if (bColors.length > row + 1) {
                 if (bColors[row + 1]) {
                     g2d.setColor(Color.RED);
                     g2d.fill3DRect(1, i + 3, rhWidth - 4, 15, false);
                     white = true;
 
                 } else
                     white = false;
             } else
                 white = false;
             if (doWhite) {
                 g2d.setColor(Color.WHITE);
                 g2d.drawString(s, (rhWidth + 9) - fm.stringWidth(s), i);
             } else {
                 g2d.setColor(Color.GRAY.darker());
                 g2d.drawString(s, (rhWidth + 9) - fm.stringWidth(s), i);
             }
             doWhite = white;
 
             i += h;
             row++;
         }
 
         g2d.setColor(Color.GRAY.darker());
         g2d.drawLine(getWidth() - 3, rec.y, getWidth() - 3, rec.height + rec.y);
     }
 }