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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    * 
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.log4j.chainsaw;
19  
20  import java.awt.*;
21  
22  import javax.swing.*;
23  import javax.swing.table.*;
24  
25  
26  /**
27   * A Table Column header renederer that displays a nice Up/Down arrow
28   * depending on whether this column is the current sort column or not,
29   * and which way the sort is functioning
30   * @author Claude Duguay
31  */
32  public class SortHeaderRenderer extends DefaultTableCellRenderer {
33    public static final Icon NONSORTED = new SortArrowIcon(SortArrowIcon.NONE);
34    public static final Icon ASCENDING = new SortArrowIcon(SortArrowIcon.ASCENDING);
35    public static final Icon DECENDING = new SortArrowIcon(SortArrowIcon.DECENDING);
36  
37    public SortHeaderRenderer() {
38      setHorizontalTextPosition(LEFT);
39      setHorizontalAlignment(CENTER);
40    }
41  
42    public Component getTableCellRendererComponent(
43      JTable table, Object value, boolean isSelected, boolean hasFocus, int row,
44      int col) {
45      int index = -1;
46      boolean ascending = true;
47  
48      if (table instanceof JSortTable) {
49        JSortTable sortTable = (JSortTable) table;
50        index = sortTable.getSortedColumnIndex();
51        ascending = sortTable.isSortedColumnAscending();
52      }
53  
54      if (table != null) {
55        JTableHeader header = table.getTableHeader();
56  
57        if (header != null) {
58          setForeground(header.getForeground());
59          setBackground(header.getBackground());
60          Font font = header.getFont();
61  		if (col == index) {
62  			
63  			setFont(new Font(font.getName(), Font.BOLD, font.getSize()));
64  		}
65  		else {
66  		  setFont(font);
67  		}
68        }
69      }
70  
71      Icon icon = ascending ? ASCENDING : DECENDING;
72      setIcon((col == index) ? icon : NONSORTED);
73      setText((value == null) ? "" : value.toString());
74      setBorder(UIManager.getBorder("TableHeader.cellBorder"));
75  
76      return this;
77    }
78  }