1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package javax.swing.plaf.basic;
26
27 import javax.swing.*;
28 import javax.swing.event.*;
29 import javax.swing.border.*;
30
31 import java.awt.*;
32
33 import java.io.Serializable;
34
35
36 /**
37 * ComboBox renderer
38 * <p>
39 * <strong>Warning:</strong>
40 * Serialized objects of this class will not be compatible with
41 * future Swing releases. The current serialization support is
42 * appropriate for short term storage or RMI between applications running
43 * the same version of Swing. As of 1.4, support for long term storage
44 * of all JavaBeans™
45 * has been added to the <code>java.beans</code> package.
46 * Please see {@link java.beans.XMLEncoder}.
47 *
48 * @author Arnaud Weber
49 */
50 @SuppressWarnings("serial") // Same-version serialization only
51 public class BasicComboBoxRenderer extends JLabel
52 implements ListCellRenderer, Serializable {
53
54 /**
55 * An empty <code>Border</code>. This field might not be used. To change the
56 * <code>Border</code> used by this renderer directly set it using
57 * the <code>setBorder</code> method.
58 */
59 protected static Border noFocusBorder = new EmptyBorder(1, 1, 1, 1);
60 private final static Border SAFE_NO_FOCUS_BORDER = new EmptyBorder(1, 1, 1, 1);
61
62 public BasicComboBoxRenderer() {
63 super();
64 setOpaque(true);
65 setBorder(getNoFocusBorder());
66 }
67
68 private static Border getNoFocusBorder() {
69 if (System.getSecurityManager() != null) {
70 return SAFE_NO_FOCUS_BORDER;
71 } else {
72 return noFocusBorder;
73 }
74 }
75
76 public Dimension getPreferredSize() {
77 Dimension size;
78
79 if ((this.getText() == null) || (this.getText().equals( "" ))) {
80 setText( " " );
81 size = super.getPreferredSize();
82 setText( "" );
83 }
84 else {
85 size = super.getPreferredSize();
86 }
87
88 return size;
89 }
90
91 public Component getListCellRendererComponent(
92 JList list,
93 Object value,
94 int index,
95 boolean isSelected,
96 boolean cellHasFocus)
97 {
98
99 /**if (isSelected) {
100 setBackground(UIManager.getColor("ComboBox.selectionBackground"));
101 setForeground(UIManager.getColor("ComboBox.selectionForeground"));
102 } else {
103 setBackground(UIManager.getColor("ComboBox.background"));
104 setForeground(UIManager.getColor("ComboBox.foreground"));
105 }**/
106
107 if (isSelected) {
108 setBackground(list.getSelectionBackground());
109 setForeground(list.getSelectionForeground());
110 }
111 else {
112 setBackground(list.getBackground());
113 setForeground(list.getForeground());
114 }
115
116 setFont(list.getFont());
117
118 if (value instanceof Icon) {
119 setIcon((Icon)value);
120 }
121 else {
122 setText((value == null) ? "" : value.toString());
123 }
124 return this;
125 }
126
127
128 /**
129 * A subclass of BasicComboBoxRenderer that implements UIResource.
130 * BasicComboBoxRenderer doesn't implement UIResource
131 * directly so that applications can safely override the
132 * cellRenderer property with BasicListCellRenderer subclasses.
133 * <p>
134 * <strong>Warning:</strong>
135 * Serialized objects of this class will not be compatible with
136 * future Swing releases. The current serialization support is
137 * appropriate for short term storage or RMI between applications running
138 * the same version of Swing. As of 1.4, support for long term storage
139 * of all JavaBeans™
140 * has been added to the <code>java.beans</code> package.
141 * Please see {@link java.beans.XMLEncoder}.
142 */
143 @SuppressWarnings("serial") // Same-version serialization only
144 public static class UIResource extends BasicComboBoxRenderer implements javax.swing.plaf.UIResource {
145 }
146 }