001 /*
002 * Copyright 1998-2004 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025 package javax.swing;
026
027 import java.beans.*;
028 import java.util.*;
029
030 import java.awt.*;
031 import java.awt.event.*;
032
033 import java.io.Serializable;
034 import java.io.ObjectOutputStream;
035 import java.io.ObjectInputStream;
036 import java.io.IOException;
037
038 import javax.swing.event.*;
039 import javax.swing.plaf.*;
040 import javax.swing.border.*;
041
042 import javax.accessibility.*;
043
044 /**
045 * The default model for combo boxes.
046 *
047 * @version 1.26 05/05/07
048 * @author Arnaud Weber
049 * @author Tom Santos
050 */
051
052 public class DefaultComboBoxModel extends AbstractListModel implements
053 MutableComboBoxModel, Serializable {
054 Vector objects;
055 Object selectedObject;
056
057 /**
058 * Constructs an empty DefaultComboBoxModel object.
059 */
060 public DefaultComboBoxModel() {
061 objects = new Vector();
062 }
063
064 /**
065 * Constructs a DefaultComboBoxModel object initialized with
066 * an array of objects.
067 *
068 * @param items an array of Object objects
069 */
070 public DefaultComboBoxModel(final Object items[]) {
071 objects = new Vector();
072 objects.ensureCapacity(items.length);
073
074 int i, c;
075 for (i = 0, c = items.length; i < c; i++)
076 objects.addElement(items[i]);
077
078 if (getSize() > 0) {
079 selectedObject = getElementAt(0);
080 }
081 }
082
083 /**
084 * Constructs a DefaultComboBoxModel object initialized with
085 * a vector.
086 *
087 * @param v a Vector object ...
088 */
089 public DefaultComboBoxModel(Vector<?> v) {
090 objects = v;
091
092 if (getSize() > 0) {
093 selectedObject = getElementAt(0);
094 }
095 }
096
097 // implements javax.swing.ComboBoxModel
098 /**
099 * Set the value of the selected item. The selected item may be null.
100 * <p>
101 * @param anObject The combo box value or null for no selection.
102 */
103 public void setSelectedItem(Object anObject) {
104 if ((selectedObject != null && !selectedObject.equals(anObject))
105 || selectedObject == null && anObject != null) {
106 selectedObject = anObject;
107 fireContentsChanged(this , -1, -1);
108 }
109 }
110
111 // implements javax.swing.ComboBoxModel
112 public Object getSelectedItem() {
113 return selectedObject;
114 }
115
116 // implements javax.swing.ListModel
117 public int getSize() {
118 return objects.size();
119 }
120
121 // implements javax.swing.ListModel
122 public Object getElementAt(int index) {
123 if (index >= 0 && index < objects.size())
124 return objects.elementAt(index);
125 else
126 return null;
127 }
128
129 /**
130 * Returns the index-position of the specified object in the list.
131 *
132 * @param anObject
133 * @return an int representing the index position, where 0 is
134 * the first position
135 */
136 public int getIndexOf(Object anObject) {
137 return objects.indexOf(anObject);
138 }
139
140 // implements javax.swing.MutableComboBoxModel
141 public void addElement(Object anObject) {
142 objects.addElement(anObject);
143 fireIntervalAdded(this , objects.size() - 1, objects.size() - 1);
144 if (objects.size() == 1 && selectedObject == null
145 && anObject != null) {
146 setSelectedItem(anObject);
147 }
148 }
149
150 // implements javax.swing.MutableComboBoxModel
151 public void insertElementAt(Object anObject, int index) {
152 objects.insertElementAt(anObject, index);
153 fireIntervalAdded(this , index, index);
154 }
155
156 // implements javax.swing.MutableComboBoxModel
157 public void removeElementAt(int index) {
158 if (getElementAt(index) == selectedObject) {
159 if (index == 0) {
160 setSelectedItem(getSize() == 1 ? null
161 : getElementAt(index + 1));
162 } else {
163 setSelectedItem(getElementAt(index - 1));
164 }
165 }
166
167 objects.removeElementAt(index);
168
169 fireIntervalRemoved(this , index, index);
170 }
171
172 // implements javax.swing.MutableComboBoxModel
173 public void removeElement(Object anObject) {
174 int index = objects.indexOf(anObject);
175 if (index != -1) {
176 removeElementAt(index);
177 }
178 }
179
180 /**
181 * Empties the list.
182 */
183 public void removeAllElements() {
184 if (objects.size() > 0) {
185 int firstIndex = 0;
186 int lastIndex = objects.size() - 1;
187 objects.removeAllElements();
188 selectedObject = null;
189 fireIntervalRemoved(this, firstIndex, lastIndex);
190 } else {
191 selectedObject = null;
192 }
193 }
194 }
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