| /* |
| * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package javax.swing; |
| |
| import java.util.*; |
| import javax.swing.event.*; |
| import java.io.Serializable; |
| |
| |
| /** |
| * This class provides the ChangeListener part of the |
| * SpinnerModel interface that should be suitable for most concrete SpinnerModel |
| * implementations. Subclasses must provide an implementation of the |
| * <code>setValue</code>, <code>getValue</code>, <code>getNextValue</code> and |
| * <code>getPreviousValue</code> methods. |
| * |
| * @see JSpinner |
| * @see SpinnerModel |
| * @see SpinnerListModel |
| * @see SpinnerNumberModel |
| * @see SpinnerDateModel |
| * |
| * @author Hans Muller |
| * @since 1.4 |
| */ |
| public abstract class AbstractSpinnerModel implements SpinnerModel, Serializable |
| { |
| |
| /** |
| * Only one ChangeEvent is needed per model instance since the |
| * event's only (read-only) state is the source property. The source |
| * of events generated here is always "this". |
| */ |
| private transient ChangeEvent changeEvent = null; |
| |
| |
| /** |
| * The list of ChangeListeners for this model. Subclasses may |
| * store their own listeners here. |
| */ |
| protected EventListenerList listenerList = new EventListenerList(); |
| |
| |
| /** |
| * Adds a ChangeListener to the model's listener list. The |
| * ChangeListeners must be notified when the models value changes. |
| * |
| * @param l the ChangeListener to add |
| * @see #removeChangeListener |
| * @see SpinnerModel#addChangeListener |
| */ |
| public void addChangeListener(ChangeListener l) { |
| listenerList.add(ChangeListener.class, l); |
| } |
| |
| |
| /** |
| * Removes a ChangeListener from the model's listener list. |
| * |
| * @param l the ChangeListener to remove |
| * @see #addChangeListener |
| * @see SpinnerModel#removeChangeListener |
| */ |
| public void removeChangeListener(ChangeListener l) { |
| listenerList.remove(ChangeListener.class, l); |
| } |
| |
| |
| /** |
| * Returns an array of all the <code>ChangeListener</code>s added |
| * to this AbstractSpinnerModel with addChangeListener(). |
| * |
| * @return all of the <code>ChangeListener</code>s added or an empty |
| * array if no listeners have been added |
| * @since 1.4 |
| */ |
| public ChangeListener[] getChangeListeners() { |
| return listenerList.getListeners(ChangeListener.class); |
| } |
| |
| |
| /** |
| * Run each ChangeListeners stateChanged() method. |
| * |
| * @see #setValue |
| * @see EventListenerList |
| */ |
| protected void fireStateChanged() |
| { |
| Object[] listeners = listenerList.getListenerList(); |
| for (int i = listeners.length - 2; i >= 0; i -=2 ) { |
| if (listeners[i] == ChangeListener.class) { |
| if (changeEvent == null) { |
| changeEvent = new ChangeEvent(this); |
| } |
| ((ChangeListener)listeners[i+1]).stateChanged(changeEvent); |
| } |
| } |
| } |
| |
| |
| /** |
| * Return an array of all the listeners of the given type that |
| * were added to this model. For example to find all of the |
| * ChangeListeners added to this model: |
| * <pre> |
| * myAbstractSpinnerModel.getListeners(ChangeListener.class); |
| * </pre> |
| * |
| * @param listenerType the type of listeners to return, e.g. ChangeListener.class |
| * @return all of the objects receiving <em>listenerType</em> notifications |
| * from this model |
| */ |
| public <T extends EventListener> T[] getListeners(Class<T> listenerType) { |
| return listenerList.getListeners(listenerType); |
| } |
| } |