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}