old-autovect-branch/libjava/classpath/javax/swing/DefaultSingleSelectionModel.java

   1 /* DefaultSingleSelectionModel.java --
   2    Copyright (C) 2002, 2004  Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package javax.swing;
  40
  41 import java.io.Serializable;
  42 import java.util.EventListener;
  43
  44 import javax.swing.event.ChangeEvent;
  45 import javax.swing.event.ChangeListener;
  46 import javax.swing.event.EventListenerList;
  47
  48 /**
  49  * The default implementation of {@link SingleSelectionModel}, used in
  50  * {@link JTabbedPane}, {@link JMenuBar} and {@link JPopupMenu}.
  51  *
  52  * @author Andrew Selkirk
  53  */
  54 public class DefaultSingleSelectionModel
  55   implements SingleSelectionModel, Serializable
  56 {
  57   private static final long serialVersionUID = 3676229404753786004L;
  58
  59   /**
  60    * changeEvent
  61    */
  62   protected transient ChangeEvent changeEvent = new ChangeEvent(this);
  63
  64   /**
  65    * listenerList
  66    */
  67   protected EventListenerList listenerList = new EventListenerList();
  68
  69   /**
  70    * index
  71    */
  72   private int index = -1;
  73
  74   /**
  75    * Constructor DefaultSingleSelectionModel
  76    */
  77   public DefaultSingleSelectionModel()
  78   {
  79     // Do nothing.
  80   }
  81
  82   /**
  83    * getSelectedIndex
  84    * @return int
  85    */
  86   public int getSelectedIndex()
  87   {
  88     return index;
  89   }
  90
  91   /**
  92    * setSelectedIndex
  93    * @param index TODO
  94    */
  95   public void setSelectedIndex(int index)
  96   {
  97     this.index = index;
  98     fireStateChanged();
  99   }
 100
 101   /**
 102    * clearSelection
 103    */
 104   public void clearSelection()
 105   {
 106     index = -1;
 107     fireStateChanged();
 108   }
 109
 110   /**
 111    * isSelected
 112    * @return boolean
 113    */
 114   public boolean isSelected()
 115   {
 116     return index != -1;
 117   }
 118
 119   /**
 120    * addChangeListener
 121    *
 122    * @param listener the listener to add
 123    */
 124   public void addChangeListener(ChangeListener listener)
 125   {
 126     listenerList.add(ChangeListener.class, listener);
 127   }
 128
 129   /**
 130    * removeChangeListener
 131    *
 132    * @param listener the listener to remove
 133    */
 134   public void removeChangeListener(ChangeListener listener)
 135   {
 136     listenerList.remove(ChangeListener.class, listener);
 137   }
 138
 139   /**
 140    * fireStateChanged
 141    */
 142   protected void fireStateChanged()
 143   {
 144     ChangeListener[] listeners = getChangeListeners();
 145
 146     for (int i = 0; i < listeners.length; i++)
 147       listeners[i].stateChanged(changeEvent);
 148   }
 149
 150   /**
 151    * getListeners
 152    *
 153    * @param listenerClass the type fo listener
 154    *
 155    * @return an array of listeners
 156    *
 157    * @since 1.3
 158    */
 159   public EventListener[] getListeners(Class listenerClass)
 160   {
 161     return listenerList.getListeners(listenerClass);
 162   }
 163
 164   /**
 165    * getChangeListeners
 166    *
 167    * @since 1.4
 168    */
 169   public ChangeListener[] getChangeListeners()
 170   {
 171     return (ChangeListener[]) getListeners(ChangeListener.class);
 172   }
 173 }