/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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.
   */
  
  package org.apache.log4j.chainsaw;
  
  import javax.swing.*;
  import javax.swing.table.DefaultTableCellRenderer;
  import javax.swing.table.JTableHeader;
  import java.awt.*;
  
  
  /**
   * A Table Column header renederer that displays a nice Up/Down arrow
   * depending on whether this column is the current sort column or not,
   * and which way the sort is functioning
   *
   * @author Claude Duguay
   */
  public class SortHeaderRenderer extends DefaultTableCellRenderer {
      public static final Icon NONSORTED = new SortArrowIcon(SortArrowIcon.NONE);
      public static final Icon ASCENDING = new SortArrowIcon(SortArrowIcon.ASCENDING);
      public static final Icon DECENDING = new SortArrowIcon(SortArrowIcon.DECENDING);
  
      public SortHeaderRenderer() {
          setHorizontalTextPosition(LEFT);
          setHorizontalAlignment(CENTER);
      }
  
      public Component getTableCellRendererComponent(
          JTable table, Object value, boolean isSelected, boolean hasFocus, int row,
          int col) {
          int index = -1;
          boolean ascending = true;
  
          if (table instanceof JSortTable) {
              JSortTable sortTable = (JSortTable) table;
              index = sortTable.getSortedColumnIndex();
              ascending = sortTable.isSortedColumnAscending();
          }
  
          if (table != null) {
              JTableHeader header = table.getTableHeader();
  
              if (header != null) {
                  setForeground(header.getForeground());
                  setBackground(header.getBackground());
                  Font font = header.getFont();
                  if (col == index) {
  
                      setFont(new Font(font.getName(), Font.BOLD, font.getSize()));
                  } else {
                      setFont(font);
                  }
              }
          }
  
          Icon icon = ascending ? ASCENDING : DECENDING;
          setIcon((col == index) ? icon : NONSORTED);
          setText((value == null) ? "" : value.toString());
          setBorder(UIManager.getBorder("TableHeader.cellBorder"));
  
          return this;
      }
  }