1 /*
2 * Copyright 1998-2004 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25 package javax.swing;
26
27 import java.beans;
28 import java.util;
29
30 import java.awt;
31 import java.awt.event;
32
33 import java.io.Serializable;
34 import java.io.ObjectOutputStream;
35 import java.io.ObjectInputStream;
36 import java.io.IOException;
37
38 import javax.swing.event;
39 import javax.swing.plaf;
40 import javax.swing.border;
41
42 import javax.accessibility;
43
44 /**
45 * The default model for combo boxes.
46 *
47 * @author Arnaud Weber
48 * @author Tom Santos
49 */
50
51 public class DefaultComboBoxModel extends AbstractListModel implements MutableComboBoxModel, Serializable {
52 Vector objects;
53 Object selectedObject;
54
55 /**
56 * Constructs an empty DefaultComboBoxModel object.
57 */
58 public DefaultComboBoxModel() {
59 objects = new Vector();
60 }
61
62 /**
63 * Constructs a DefaultComboBoxModel object initialized with
64 * an array of objects.
65 *
66 * @param items an array of Object objects
67 */
68 public DefaultComboBoxModel(final Object items[]) {
69 objects = new Vector();
70 objects.ensureCapacity( items.length );
71
72 int i,c;
73 for ( i=0,c=items.length;i<c;i++ )
74 objects.addElement(items[i]);
75
76 if ( getSize() > 0 ) {
77 selectedObject = getElementAt( 0 );
78 }
79 }
80
81 /**
82 * Constructs a DefaultComboBoxModel object initialized with
83 * a vector.
84 *
85 * @param v a Vector object ...
86 */
87 public DefaultComboBoxModel(Vector<?> v) {
88 objects = v;
89
90 if ( getSize() > 0 ) {
91 selectedObject = getElementAt( 0 );
92 }
93 }
94
95 // implements javax.swing.ComboBoxModel
96 /**
97 * Set the value of the selected item. The selected item may be null.
98 * <p>
99 * @param anObject The combo box value or null for no selection.
100 */
101 public void setSelectedItem(Object anObject) {
102 if ((selectedObject != null && !selectedObject.equals( anObject )) ||
103 selectedObject == null && anObject != null) {
104 selectedObject = anObject;
105 fireContentsChanged(this, -1, -1);
106 }
107 }
108
109 // implements javax.swing.ComboBoxModel
110 public Object getSelectedItem() {
111 return selectedObject;
112 }
113
114 // implements javax.swing.ListModel
115 public int getSize() {
116 return objects.size();
117 }
118
119 // implements javax.swing.ListModel
120 public Object getElementAt(int index) {
121 if ( index >= 0 && index < objects.size() )
122 return objects.elementAt(index);
123 else
124 return null;
125 }
126
127 /**
128 * Returns the index-position of the specified object in the list.
129 *
130 * @param anObject
131 * @return an int representing the index position, where 0 is
132 * the first position
133 */
134 public int getIndexOf(Object anObject) {
135 return objects.indexOf(anObject);
136 }
137
138 // implements javax.swing.MutableComboBoxModel
139 public void addElement(Object anObject) {
140 objects.addElement(anObject);
141 fireIntervalAdded(this,objects.size()-1, objects.size()-1);
142 if ( objects.size() == 1 && selectedObject == null && anObject != null ) {
143 setSelectedItem( anObject );
144 }
145 }
146
147 // implements javax.swing.MutableComboBoxModel
148 public void insertElementAt(Object anObject,int index) {
149 objects.insertElementAt(anObject,index);
150 fireIntervalAdded(this, index, index);
151 }
152
153 // implements javax.swing.MutableComboBoxModel
154 public void removeElementAt(int index) {
155 if ( getElementAt( index ) == selectedObject ) {
156 if ( index == 0 ) {
157 setSelectedItem( getSize() == 1 ? null : getElementAt( index + 1 ) );
158 }
159 else {
160 setSelectedItem( getElementAt( index - 1 ) );
161 }
162 }
163
164 objects.removeElementAt(index);
165
166 fireIntervalRemoved(this, index, index);
167 }
168
169 // implements javax.swing.MutableComboBoxModel
170 public void removeElement(Object anObject) {
171 int index = objects.indexOf(anObject);
172 if ( index != -1 ) {
173 removeElementAt(index);
174 }
175 }
176
177 /**
178 * Empties the list.
179 */
180 public void removeAllElements() {
181 if ( objects.size() > 0 ) {
182 int firstIndex = 0;
183 int lastIndex = objects.size() - 1;
184 objects.removeAllElements();
185 selectedObject = null;
186 fireIntervalRemoved(this, firstIndex, lastIndex);
187 } else {
188 selectedObject = null;
189 }
190 }
191 }
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