001/* DefaultColorSelectionModel.java -- 002 Copyright (C) 2002, 2004 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package javax.swing.colorchooser; 040 041import java.awt.Color; 042import java.io.Serializable; 043 044import javax.swing.event.ChangeEvent; 045import javax.swing.event.ChangeListener; 046import 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 */ 055public 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}