001 /* DefaultColorSelectionModel.java --
002 Copyright (C) 2002, 2004 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package javax.swing.colorchooser;
040
041 import java.awt.Color;
042 import java.io.Serializable;
043
044 import javax.swing.event.ChangeEvent;
045 import javax.swing.event.ChangeListener;
046 import javax.swing.event.EventListenerList;
047
048 /**
049 * This is the default implementation of the ColorSelectionModel interface
050 * that JColorChoosers use.
051 *
052 * @author Andrew Selkirk
053 * @version 1.0
054 */
055 public class DefaultColorSelectionModel implements ColorSelectionModel,
056 Serializable
057 {
058 /** DOCUMENT ME! */
059 private static final long serialVersionUID = -8117143602864778804L;
060
061 /** The currently selected color. */
062 private Color selectedColor;
063
064 /** The ChangeEvent fired to all ChangeListeners. */
065 protected transient ChangeEvent changeEvent = new ChangeEvent(this);
066
067 /** The list of listeners. */
068 protected EventListenerList listenerList = new EventListenerList();
069
070 /**
071 * Creates a new color selection model with the default white color.
072 */
073 public DefaultColorSelectionModel()
074 {
075 this(Color.white);
076 }
077
078 /**
079 * Creates a new color selection model with a given selected color.
080 *
081 * @param color The initial color.
082 *
083 * @throws Error If the color is null.
084 */
085 public DefaultColorSelectionModel(Color color)
086 {
087 super();
088 if (color == null)
089 throw new Error("ColorSelectionModel cannot be set to have null color.");
090 this.selectedColor = color;
091 }
092
093 /**
094 * Returns the selected color.
095 *
096 * @return The selected color.
097 */
098 public Color getSelectedColor()
099 {
100 return selectedColor;
101 }
102
103 /**
104 * This method sets the color.
105 *
106 * @param color The color to set.
107 *
108 * @throws Error If the color is set.
109 */
110 public void setSelectedColor(Color color)
111 {
112 if (color == null)
113 throw new Error("ColorSelectionModel cannot be set to have null color.");
114 if (color != selectedColor)
115 {
116 this.selectedColor = color;
117 fireStateChanged();
118 }
119 }
120
121 /**
122 * Adds a listener to this model.
123 *
124 * @param listener The listener to add.
125 */
126 public void addChangeListener(ChangeListener listener)
127 {
128 listenerList.add(ChangeListener.class, listener);
129 }
130
131 /**
132 * Removes a listener from this model.
133 *
134 * @param listener The listener to remove.
135 */
136 public void removeChangeListener(ChangeListener listener)
137 {
138 listenerList.remove(ChangeListener.class, listener);
139 }
140
141 /**
142 * Returns all currently added <code>ChangeListener</code> objects.
143 *
144 * @return Array of <code>ChangeListener</code> objects.
145 */
146 public ChangeListener[] getChangeListeners()
147 {
148 return (ChangeListener[]) listenerList.getListeners(ChangeListener.class);
149 }
150
151 /**
152 * Calls all the <code>stateChanged()</code> method of all added
153 * <code>ChangeListener</code> objects with <code>changeEvent</code> as
154 * argument.
155 */
156 protected void fireStateChanged()
157 {
158 ChangeListener[] listeners = getChangeListeners();
159
160 for (int i = 0; i < listeners.length; i++)
161 listeners[i].stateChanged(changeEvent);
162 }
163 }