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| 1 | +/* | |
| 2 | + * Copyright (c) 2000, 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 java.util.*; | |
| 29 | +import javax.swing.event.*; | |
| 30 | +import java.io.Serializable; | |
| 31 | + | |
| 32 | + | |
| 33 | +/** | |
| 34 | + * This class provides the ChangeListener part of the | |
| 35 | + * SpinnerModel interface that should be suitable for most concrete SpinnerModel | |
| 36 | + * implementations. Subclasses must provide an implementation of the | |
| 37 | + * <code>setValue</code>, <code>getValue</code>, <code>getNextValue</code> and | |
| 38 | + * <code>getPreviousValue</code> methods. | |
| 39 | + * | |
| 40 | + * @see JSpinner | |
| 41 | + * @see SpinnerModel | |
| 42 | + * @see SpinnerListModel | |
| 43 | + * @see SpinnerNumberModel | |
| 44 | + * @see SpinnerDateModel | |
| 45 | + * | |
| 46 | + * @author Hans Muller | |
| 47 | + * @since 1.4 | |
| 48 | + */ | |
| 49 | +public abstract class AbstractSpinnerModel implements SpinnerModel, Serializable | |
| 50 | +{ | |
| 51 | + | |
| 52 | + /** | |
| 53 | + * Only one ChangeEvent is needed per model instance since the | |
| 54 | + * event's only (read-only) state is the source property. The source | |
| 55 | + * of events generated here is always "this". | |
| 56 | + */ | |
| 57 | + private transient ChangeEvent changeEvent = null; | |
| 58 | + | |
| 59 | + | |
| 60 | + /** | |
| 61 | + * The list of ChangeListeners for this model. Subclasses may | |
| 62 | + * store their own listeners here. | |
| 63 | + */ | |
| 64 | + protected EventListenerList listenerList = new EventListenerList(); | |
| 65 | + | |
| 66 | + | |
| 67 | + /** | |
| 68 | + * Adds a ChangeListener to the model's listener list. The | |
| 69 | + * ChangeListeners must be notified when the models value changes. | |
| 70 | + * | |
| 71 | + * @param l the ChangeListener to add | |
| 72 | + * @see #removeChangeListener | |
| 73 | + * @see SpinnerModel#addChangeListener | |
| 74 | + */ | |
| 75 | + public void addChangeListener(ChangeListener l) { | |
| 76 | + listenerList.add(ChangeListener.class, l); | |
| 77 | + } | |
| 78 | + | |
| 79 | + | |
| 80 | + /** | |
| 81 | + * Removes a ChangeListener from the model's listener list. | |
| 82 | + * | |
| 83 | + * @param l the ChangeListener to remove | |
| 84 | + * @see #addChangeListener | |
| 85 | + * @see SpinnerModel#removeChangeListener | |
| 86 | + */ | |
| 87 | + public void removeChangeListener(ChangeListener l) { | |
| 88 | + listenerList.remove(ChangeListener.class, l); | |
| 89 | + } | |
| 90 | + | |
| 91 | + | |
| 92 | + /** | |
| 93 | + * Returns an array of all the <code>ChangeListener</code>s added | |
| 94 | + * to this AbstractSpinnerModel with addChangeListener(). | |
| 95 | + * | |
| 96 | + * @return all of the <code>ChangeListener</code>s added or an empty | |
| 97 | + * array if no listeners have been added | |
| 98 | + * @since 1.4 | |
| 99 | + */ | |
| 100 | + public ChangeListener[] getChangeListeners() { | |
| 101 | + return listenerList.getListeners(ChangeListener.class); | |
| 102 | + } | |
| 103 | + | |
| 104 | + | |
| 105 | + /** | |
| 106 | + * Run each ChangeListeners stateChanged() method. | |
| 107 | + * | |
| 108 | + * @see #setValue | |
| 109 | + * @see EventListenerList | |
| 110 | + */ | |
| 111 | + protected void fireStateChanged() | |
| 112 | + { | |
| 113 | + Object[] listeners = listenerList.getListenerList(); | |
| 114 | + for (int i = listeners.length - 2; i >= 0; i -=2 ) { | |
| 115 | + if (listeners[i] == ChangeListener.class) { | |
| 116 | + if (changeEvent == null) { | |
| 117 | + changeEvent = new ChangeEvent(this); | |
| 118 | + } | |
| 119 | + ((ChangeListener)listeners[i+1]).stateChanged(changeEvent); | |
| 120 | + } | |
| 121 | + } | |
| 122 | + } | |
| 123 | + | |
| 124 | + | |
| 125 | + /** | |
| 126 | + * Return an array of all the listeners of the given type that | |
| 127 | + * were added to this model. For example to find all of the | |
| 128 | + * ChangeListeners added to this model: | |
| 129 | + * <pre> | |
| 130 | + * myAbstractSpinnerModel.getListeners(ChangeListener.class); | |
| 131 | + * </pre> | |
| 132 | + * | |
| 133 | + * @param listenerType the type of listeners to return, e.g. ChangeListener.class | |
| 134 | + * @return all of the objects receiving <em>listenerType</em> notifications | |
| 135 | + * from this model | |
| 136 | + */ | |
| 137 | + public <T extends EventListener> T[] getListeners(Class<T> listenerType) { | |
| 138 | + return listenerList.getListeners(listenerType); | |
| 139 | + } | |
| 140 | +} | |