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 }