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 */
25package javax.swing.plaf.basic;
26
27import javax.swing.*;
28import javax.swing.event.*;
29import javax.swing.border.*;
30
31import java.awt.*;
32
33import 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&trade;
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
51public class BasicComboBoxRenderer extends JLabel
52implements ListCellRenderer<Object>, 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 static final Border SAFE_NO_FOCUS_BORDER = new EmptyBorder(1, 1, 1, 1);
61
62    /**
63     * Constructs a new instance of {@code BasicComboBoxRenderer}.
64     */
65    public BasicComboBoxRenderer() {
66        super();
67        setOpaque(true);
68        setBorder(getNoFocusBorder());
69    }
70
71    private static Border getNoFocusBorder() {
72        if (System.getSecurityManager() != null) {
73            return SAFE_NO_FOCUS_BORDER;
74        } else {
75            return noFocusBorder;
76        }
77    }
78
79    public Dimension getPreferredSize() {
80        Dimension size;
81
82        if ((this.getText() == null) || (this.getText().equals( "" ))) {
83            setText( " " );
84            size = super.getPreferredSize();
85            setText( "" );
86        }
87        else {
88            size = super.getPreferredSize();
89        }
90
91        return size;
92    }
93
94    @Override
95    public Component getListCellRendererComponent(JList<?> list,
96                                                 Object value,
97                                                 int index,
98                                                 boolean isSelected,
99                                                 boolean cellHasFocus)
100    {
101
102        /**if (isSelected) {
103            setBackground(UIManager.getColor("ComboBox.selectionBackground"));
104            setForeground(UIManager.getColor("ComboBox.selectionForeground"));
105        } else {
106            setBackground(UIManager.getColor("ComboBox.background"));
107            setForeground(UIManager.getColor("ComboBox.foreground"));
108        }**/
109
110        if (isSelected) {
111            setBackground(list.getSelectionBackground());
112            setForeground(list.getSelectionForeground());
113        }
114        else {
115            setBackground(list.getBackground());
116            setForeground(list.getForeground());
117        }
118
119        setFont(list.getFont());
120
121        if (value instanceof Icon) {
122            setIcon((Icon)value);
123        }
124        else {
125            setText((value == null) ? "" : value.toString());
126        }
127        return this;
128    }
129
130
131    /**
132     * A subclass of BasicComboBoxRenderer that implements UIResource.
133     * BasicComboBoxRenderer doesn't implement UIResource
134     * directly so that applications can safely override the
135     * cellRenderer property with BasicListCellRenderer subclasses.
136     * <p>
137     * <strong>Warning:</strong>
138     * Serialized objects of this class will not be compatible with
139     * future Swing releases. The current serialization support is
140     * appropriate for short term storage or RMI between applications running
141     * the same version of Swing.  As of 1.4, support for long term storage
142     * of all JavaBeans&trade;
143     * has been added to the <code>java.beans</code> package.
144     * Please see {@link java.beans.XMLEncoder}.
145     */
146    @SuppressWarnings("serial") // Same-version serialization only
147    public static class UIResource extends BasicComboBoxRenderer implements javax.swing.plaf.UIResource {
148    }
149}
150