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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 2008, 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 | |||
| 26 | package javax.swing; | ||
| 27 | |||
| 28 | import javax.swing.event.*; | ||
| 29 | import java.io.Serializable; | ||
| 30 | import java.util.EventListener; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * A generic implementation of SingleSelectionModel. | ||
| 34 | * <p> | ||
| 35 | * <strong>Warning:</strong> | ||
| 36 | * Serialized objects of this class will not be compatible with | ||
| 37 | * future Swing releases. The current serialization support is | ||
| 38 | * appropriate for short term storage or RMI between applications running | ||
| 39 | * the same version of Swing. As of 1.4, support for long term storage | ||
| 40 | * of all JavaBeans<sup><font size="-2">TM</font></sup> | ||
| 41 | * has been added to the <code>java.beans</code> package. | ||
| 42 | * Please see {@link java.beans.XMLEncoder}. | ||
| 43 | * | ||
| 44 | * @author Dave Moore | ||
| 45 | */ | ||
| 46 | public class DefaultSingleSelectionModel implements SingleSelectionModel, | ||
| 47 | Serializable { | ||
| 48 | /* Only one ModelChangeEvent is needed per model instance since the | ||
| 49 | * event's only (read-only) state is the source property. The source | ||
| 50 | * of events generated here is always "this". | ||
| 51 | */ | ||
| 52 | protected transient ChangeEvent changeEvent = null; | ||
| 53 | /** The collection of registered listeners */ | ||
| 54 | protected EventListenerList listenerList = new EventListenerList(); | ||
| 55 | |||
| 56 | private int index = -1; | ||
| 57 | |||
| 58 | // implements javax.swing.SingleSelectionModel | ||
| 59 | public int getSelectedIndex() { | ||
| 60 | return index; | ||
| 61 | } | ||
| 62 | |||
| 63 | // implements javax.swing.SingleSelectionModel | ||
| 64 | public void setSelectedIndex(int index) { | ||
| 65 | if (this.index != index) { | ||
| 66 | this.index = index; | ||
| 67 | fireStateChanged(); | ||
| 68 | } | ||
| 69 | } | ||
| 70 | |||
| 71 | // implements javax.swing.SingleSelectionModel | ||
| 72 | public void clearSelection() { | ||
| 73 | setSelectedIndex(-1); | ||
| 74 | } | ||
| 75 | |||
| 76 | // implements javax.swing.SingleSelectionModel | ||
| 77 | public boolean isSelected() { | ||
| 78 | boolean ret = false; | ||
| 79 | if (getSelectedIndex() != -1) { | ||
| 80 | ret = true; | ||
| 81 | } | ||
| 82 | return ret; | ||
| 83 | } | ||
| 84 | |||
| 85 | /** | ||
| 86 | * Adds a <code>ChangeListener</code> to the button. | ||
| 87 | */ | ||
| 88 | public void addChangeListener(ChangeListener l) { | ||
| 89 | listenerList.add(ChangeListener.class, l); | ||
| 90 | } | ||
| 91 | |||
| 92 | /** | ||
| 93 | * Removes a <code>ChangeListener</code> from the button. | ||
| 94 | */ | ||
| 95 | public void removeChangeListener(ChangeListener l) { | ||
| 96 | listenerList.remove(ChangeListener.class, l); | ||
| 97 | } | ||
| 98 | |||
| 99 | /** | ||
| 100 | * Returns an array of all the change listeners | ||
| 101 | * registered on this <code>DefaultSingleSelectionModel</code>. | ||
| 102 | * | ||
| 103 | * @return all of this model's <code>ChangeListener</code>s | ||
| 104 | * or an empty | ||
| 105 | * array if no change listeners are currently registered | ||
| 106 | * | ||
| 107 | * @see #addChangeListener | ||
| 108 | * @see #removeChangeListener | ||
| 109 | * | ||
| 110 | * @since 1.4 | ||
| 111 | */ | ||
| 112 | public ChangeListener[] getChangeListeners() { | ||
| 113 | return listenerList.getListeners(ChangeListener.class); | ||
| 114 | } | ||
| 115 | |||
| 116 | /** | ||
| 117 | * Notifies all listeners that have registered interest for | ||
| 118 | * notification on this event type. The event instance | ||
| 119 | * is created lazily. | ||
| 120 | * @see EventListenerList | ||
| 121 | */ | ||
| 122 | protected void fireStateChanged() { | ||
| 123 | // Guaranteed to return a non-null array | ||
| 124 | Object[] listeners = listenerList.getListenerList(); | ||
| 125 | // Process the listeners last to first, notifying | ||
| 126 | // those that are interested in this event | ||
| 127 | for (int i = listeners.length-2; i>=0; i-=2) { | ||
| 128 | if (listeners[i]==ChangeListener.class) { | ||
| 129 | // Lazily create the event: | ||
| 130 | if (changeEvent == null) | ||
| 131 | changeEvent = new ChangeEvent(this); | ||
| 132 | ((ChangeListener)listeners[i+1]).stateChanged(changeEvent); | ||
| 133 | } | ||
| 134 | } | ||
| 135 | } | ||
| 136 | |||
| 137 | /** | ||
| 138 | * Returns an array of all the objects currently registered as | ||
| 139 | * <code><em>Foo</em>Listener</code>s | ||
| 140 | * upon this model. | ||
| 141 | * <code><em>Foo</em>Listener</code>s | ||
| 142 | * are registered using the <code>add<em>Foo</em>Listener</code> method. | ||
| 143 | * <p> | ||
| 144 | * You can specify the <code>listenerType</code> argument | ||
| 145 | * with a class literal, such as <code><em>Foo</em>Listener.class</code>. | ||
| 146 | * For example, you can query a <code>DefaultSingleSelectionModel</code> | ||
| 147 | * instance <code>m</code> | ||
| 148 | * for its change listeners | ||
| 149 | * with the following code: | ||
| 150 | * | ||
| 151 | * <pre>ChangeListener[] cls = (ChangeListener[])(m.getListeners(ChangeListener.class));</pre> | ||
| 152 | * | ||
| 153 | * If no such listeners exist, | ||
| 154 | * this method returns an empty array. | ||
| 155 | * | ||
| 156 | * @param listenerType the type of listeners requested; | ||
| 157 | * this parameter should specify an interface | ||
| 158 | * that descends from <code>java.util.EventListener</code> | ||
| 159 | * @return an array of all objects registered as | ||
| 160 | * <code><em>Foo</em>Listener</code>s | ||
| 161 | * on this model, | ||
| 162 | * or an empty array if no such | ||
| 163 | * listeners have been added | ||
| 164 | * @exception ClassCastException if <code>listenerType</code> doesn't | ||
| 165 | * specify a class or interface that implements | ||
| 166 | * <code>java.util.EventListener</code> | ||
| 167 | * | ||
| 168 | * @see #getChangeListeners | ||
| 169 | * | ||
| 170 | * @since 1.3 | ||
| 171 | */ | ||
| 172 | public <T extends EventListener> T[] getListeners(Class<T> listenerType) { | ||
| 173 | return listenerList.getListeners(listenerType); | ||
| 174 | } | ||
| 175 | } | ||