| /* DefaultSingleSelectionModel.java -- |
| Copyright (C) 2002, 2004, 2006, Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package javax.swing; |
| |
| import java.io.Serializable; |
| import java.util.EventListener; |
| |
| import javax.swing.event.ChangeEvent; |
| import javax.swing.event.ChangeListener; |
| import javax.swing.event.EventListenerList; |
| |
| /** |
| * The default implementation of {@link SingleSelectionModel}, used in |
| * {@link JTabbedPane}, {@link JMenuBar} and {@link JPopupMenu}. |
| * |
| * @author Andrew Selkirk |
| */ |
| public class DefaultSingleSelectionModel |
| implements SingleSelectionModel, Serializable |
| { |
| private static final long serialVersionUID = 3676229404753786004L; |
| |
| /** |
| * changeEvent |
| */ |
| protected transient ChangeEvent changeEvent; |
| |
| /** |
| * listenerList |
| */ |
| protected EventListenerList listenerList = new EventListenerList(); |
| |
| /** |
| * The selected index (or -1 for no selection). |
| */ |
| private int index = -1; |
| |
| /** |
| * Creates a new <code>DefaultSingleSelectionModel</code> with no current |
| * selection. |
| */ |
| public DefaultSingleSelectionModel() |
| { |
| // Do nothing. |
| } |
| |
| /** |
| * Returns the selected index or <code>-1</code> if there is no selection. |
| * |
| * @return The selected index. |
| * |
| * @see #setSelectedIndex(int) |
| */ |
| public int getSelectedIndex() |
| { |
| return index; |
| } |
| |
| /** |
| * Sets the selected index and, if this is different to the previous |
| * selection, sends a {@link ChangeEvent} to all registered listeners. |
| * |
| * @param index the index (use <code>-1</code> to represent no selection). |
| * |
| * @see #getSelectedIndex() |
| * @see #clearSelection |
| */ |
| public void setSelectedIndex(int index) |
| { |
| if (this.index != index) |
| { |
| this.index = index; |
| fireStateChanged(); |
| } |
| } |
| |
| /** |
| * Clears the selection by setting the selected index to <code>-1</code> and |
| * sends a {@link ChangeEvent} to all registered listeners. If the selected |
| * index is already <code>-1</code>, this method does nothing. |
| */ |
| public void clearSelection() |
| { |
| setSelectedIndex(-1); |
| } |
| |
| /** |
| * Returns <code>true</code> if there is a selection, and <code>false</code> |
| * otherwise. |
| * |
| * @return A boolean. |
| */ |
| public boolean isSelected() |
| { |
| return index != -1; |
| } |
| |
| /** |
| * Registers a listener to receive {@link ChangeEvent} notifications from |
| * this model whenever the selected index changes. |
| * |
| * @param listener the listener to add. |
| */ |
| public void addChangeListener(ChangeListener listener) |
| { |
| listenerList.add(ChangeListener.class, listener); |
| } |
| |
| /** |
| * Deregisters a listener so that it no longer receives {@link ChangeEvent} |
| * notifications from this model. |
| * |
| * @param listener the listener to remove. |
| */ |
| public void removeChangeListener(ChangeListener listener) |
| { |
| listenerList.remove(ChangeListener.class, listener); |
| } |
| |
| /** |
| * fireStateChanged |
| */ |
| protected void fireStateChanged() |
| { |
| if (changeEvent == null) |
| changeEvent = new ChangeEvent(this); |
| ChangeListener[] listeners = getChangeListeners(); |
| for (int i = 0; i < listeners.length; i++) |
| listeners[i].stateChanged(changeEvent); |
| } |
| |
| /** |
| * getListeners |
| * |
| * @param listenerClass the type fo listener |
| * |
| * @return an array of listeners |
| * |
| * @since 1.3 |
| */ |
| public EventListener[] getListeners(Class listenerClass) |
| { |
| return listenerList.getListeners(listenerClass); |
| } |
| |
| /** |
| * getChangeListeners |
| * |
| * @since 1.4 |
| */ |
| public ChangeListener[] getChangeListeners() |
| { |
| return (ChangeListener[]) getListeners(ChangeListener.class); |
| } |
| } |