Source for javax.swing.colorchooser.DefaultColorSelectionModel

   1: /* DefaultColorSelectionModel.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.colorchooser;
  40: 
  41: import java.awt.Color;
  42: import java.io.Serializable;
  43: 
  44: import javax.swing.event.ChangeEvent;
  45: import javax.swing.event.ChangeListener;
  46: import javax.swing.event.EventListenerList;
  47: 
  48: /**
  49:  * This is the default implementation of the ColorSelectionModel interface
  50:  * that JColorChoosers use.
  51:  *
  52:  * @author Andrew Selkirk
  53:  * @version 1.0
  54:  */
  55: public class DefaultColorSelectionModel implements ColorSelectionModel,
  56:                                                    Serializable
  57: {
  58:   /** DOCUMENT ME! */
  59:   private static final long serialVersionUID = -8117143602864778804L;
  60: 
  61:   /** The currently selected color. */
  62:   private Color selectedColor;
  63: 
  64:   /** The ChangeEvent fired to all ChangeListeners. */
  65:   protected transient ChangeEvent changeEvent = new ChangeEvent(this);
  66: 
  67:   /** The list of listeners. */
  68:   protected EventListenerList listenerList = new EventListenerList();
  69: 
  70:   /**
  71:    * Creates a new color selection model with the default white color.
  72:    */
  73:   public DefaultColorSelectionModel()
  74:   {
  75:     this(Color.white);
  76:   }
  77: 
  78:   /**
  79:    * Creates a new color selection model with a given selected color.
  80:    *
  81:    * @param color The initial color.
  82:    *
  83:    * @throws Error If the color is null.
  84:    */
  85:   public DefaultColorSelectionModel(Color color)
  86:   {
  87:     super();
  88:     if (color == null)
  89:       throw new Error("ColorSelectionModel cannot be set to have null color.");
  90:     this.selectedColor = color;
  91:   }
  92: 
  93:   /**
  94:    * Returns the selected color.
  95:    *
  96:    * @return The selected color.
  97:    */
  98:   public Color getSelectedColor()
  99:   {
 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: }