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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: }
GNU Classpath (0.20) |