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 */ DefaultSingleSelectionModel()77 public DefaultSingleSelectionModel() 78 { 79 // Do nothing. 80 } 81 82 /** 83 * getSelectedIndex 84 * @return int 85 */ getSelectedIndex()86 public int getSelectedIndex() 87 { 88 return index; 89 } 90 91 /** 92 * setSelectedIndex 93 * @param index TODO 94 */ setSelectedIndex(int index)95 public void setSelectedIndex(int index) 96 { 97 this.index = index; 98 fireStateChanged(); 99 } 100 101 /** 102 * clearSelection 103 */ clearSelection()104 public void clearSelection() 105 { 106 index = -1; 107 fireStateChanged(); 108 } 109 110 /** 111 * isSelected 112 * @return boolean 113 */ isSelected()114 public boolean isSelected() 115 { 116 return index != -1; 117 } 118 119 /** 120 * addChangeListener 121 * 122 * @param listener the listener to add 123 */ addChangeListener(ChangeListener listener)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 */ removeChangeListener(ChangeListener listener)134 public void removeChangeListener(ChangeListener listener) 135 { 136 listenerList.remove(ChangeListener.class, listener); 137 } 138 139 /** 140 * fireStateChanged 141 */ fireStateChanged()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 */ getListeners(Class listenerClass)159 public EventListener[] getListeners(Class listenerClass) 160 { 161 return listenerList.getListeners(listenerClass); 162 } 163 164 /** 165 * getChangeListeners 166 * 167 * @since 1.4 168 */ getChangeListeners()169 public ChangeListener[] getChangeListeners() 170 { 171 return (ChangeListener[]) getListeners(ChangeListener.class); 172 } 173 } 174