| /* |
| * Copyright (c) 1997, 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 javax.swing.event.*; |
| import java.io.Serializable; |
| import java.util.EventListener; |
| |
| /** |
| * A generic implementation of SingleSelectionModel. |
| * <p> |
| * <strong>Warning:</strong> |
| * Serialized objects of this class will not be compatible with |
| * future Swing releases. The current serialization support is |
| * appropriate for short term storage or RMI between applications running |
| * the same version of Swing. As of 1.4, support for long term storage |
| * of all JavaBeans<sup><font size="-2">TM</font></sup> |
| * has been added to the <code>java.beans</code> package. |
| * Please see {@link java.beans.XMLEncoder}. |
| * |
| * @author Dave Moore |
| */ |
| public class DefaultSingleSelectionModel implements SingleSelectionModel, |
| Serializable { |
| /* Only one ModelChangeEvent 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". |
| */ |
| protected transient ChangeEvent changeEvent = null; |
| /** The collection of registered listeners */ |
| protected EventListenerList listenerList = new EventListenerList(); |
| |
| private int index = -1; |
| |
| // implements javax.swing.SingleSelectionModel |
| public int getSelectedIndex() { |
| return index; |
| } |
| |
| // implements javax.swing.SingleSelectionModel |
| public void setSelectedIndex(int index) { |
| if (this.index != index) { |
| this.index = index; |
| fireStateChanged(); |
| } |
| } |
| |
| // implements javax.swing.SingleSelectionModel |
| public void clearSelection() { |
| setSelectedIndex(-1); |
| } |
| |
| // implements javax.swing.SingleSelectionModel |
| public boolean isSelected() { |
| boolean ret = false; |
| if (getSelectedIndex() != -1) { |
| ret = true; |
| } |
| return ret; |
| } |
| |
| /** |
| * Adds a <code>ChangeListener</code> to the button. |
| */ |
| public void addChangeListener(ChangeListener l) { |
| listenerList.add(ChangeListener.class, l); |
| } |
| |
| /** |
| * Removes a <code>ChangeListener</code> from the button. |
| */ |
| public void removeChangeListener(ChangeListener l) { |
| listenerList.remove(ChangeListener.class, l); |
| } |
| |
| /** |
| * Returns an array of all the change listeners |
| * registered on this <code>DefaultSingleSelectionModel</code>. |
| * |
| * @return all of this model's <code>ChangeListener</code>s |
| * or an empty |
| * array if no change listeners are currently registered |
| * |
| * @see #addChangeListener |
| * @see #removeChangeListener |
| * |
| * @since 1.4 |
| */ |
| public ChangeListener[] getChangeListeners() { |
| return listenerList.getListeners(ChangeListener.class); |
| } |
| |
| /** |
| * Notifies all listeners that have registered interest for |
| * notification on this event type. The event instance |
| * is created lazily. |
| * @see EventListenerList |
| */ |
| protected void fireStateChanged() { |
| // Guaranteed to return a non-null array |
| Object[] listeners = listenerList.getListenerList(); |
| // Process the listeners last to first, notifying |
| // those that are interested in this event |
| for (int i = listeners.length-2; i>=0; i-=2) { |
| if (listeners[i]==ChangeListener.class) { |
| // Lazily create the event: |
| if (changeEvent == null) |
| changeEvent = new ChangeEvent(this); |
| ((ChangeListener)listeners[i+1]).stateChanged(changeEvent); |
| } |
| } |
| } |
| |
| /** |
| * Returns an array of all the objects currently registered as |
| * <code><em>Foo</em>Listener</code>s |
| * upon this model. |
| * <code><em>Foo</em>Listener</code>s |
| * are registered using the <code>add<em>Foo</em>Listener</code> method. |
| * <p> |
| * You can specify the <code>listenerType</code> argument |
| * with a class literal, such as <code><em>Foo</em>Listener.class</code>. |
| * For example, you can query a <code>DefaultSingleSelectionModel</code> |
| * instance <code>m</code> |
| * for its change listeners |
| * with the following code: |
| * |
| * <pre>ChangeListener[] cls = (ChangeListener[])(m.getListeners(ChangeListener.class));</pre> |
| * |
| * If no such listeners exist, |
| * this method returns an empty array. |
| * |
| * @param listenerType the type of listeners requested; |
| * this parameter should specify an interface |
| * that descends from <code>java.util.EventListener</code> |
| * @return an array of all objects registered as |
| * <code><em>Foo</em>Listener</code>s |
| * on this model, |
| * or an empty array if no such |
| * listeners have been added |
| * @exception ClassCastException if <code>listenerType</code> doesn't |
| * specify a class or interface that implements |
| * <code>java.util.EventListener</code> |
| * |
| * @see #getChangeListeners |
| * |
| * @since 1.3 |
| */ |
| public <T extends EventListener> T[] getListeners(Class<T> listenerType) { |
| return listenerList.getListeners(listenerType); |
| } |
| } |