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 package org.apache.log4j.chainsaw;
18
19 import javax.swing.*;
20 import javax.swing.border.Border;
21 import javax.swing.table.TableColumn;
22 import java.awt.*;
23
24
25 /**
26 * A ListCellRenderer that display a check box if the value
27 * has been "checked".
28 * <p>
29 * Borrowed heavily from the excellent book "Swing, 2nd Edition" by
30 * Matthew Robinson & Pavel Vorobiev.
31 *
32 * @author Paul Smith
33 */
34 public abstract class CheckListCellRenderer extends JCheckBox
35 implements ListCellRenderer {
36 private final Border noFocusBorder =
37 BorderFactory.createEmptyBorder(1, 1, 1, 1);
38
39 /**
40 *
41 */
42 public CheckListCellRenderer() {
43 super();
44 setOpaque(true);
45 setBorder(noFocusBorder);
46 }
47
48 /* (non-Javadoc)
49 * @see javax.swing.ListCellRenderer#getListCellRendererComponent(javax.swing.JList, java.lang.Object, int, boolean, boolean)
50 */
51 public Component getListCellRendererComponent(
52 JList list, Object value, int index, boolean isSelected,
53 boolean cellHasFocus) {
54 setText(((TableColumn) value).getHeaderValue().toString());
55 setBackground(
56 isSelected ? list.getSelectionBackground() : list.getBackground());
57 setForeground(
58 isSelected ? list.getSelectionForeground() : list.getForeground());
59 setFont(list.getFont());
60 setBorder(
61 cellHasFocus ? UIManager.getBorder("List.focusCellHighlightBorder")
62 : noFocusBorder);
63
64 setSelected(isSelected(value));
65 return this;
66 }
67
68 /**
69 * @param value
70 * @return selected flag
71 */
72 protected abstract boolean isSelected(Object value);
73 }