Source for javax.swing.AbstractCellEditor

   1: /* AbstractCellEditor.java --
   2:    Copyright (C) 2002, 2004, 2005, 2006, 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;
  40: 
  41: import java.io.Serializable;
  42: import java.util.EventObject;
  43: 
  44: import javax.swing.event.CellEditorListener;
  45: import javax.swing.event.ChangeEvent;
  46: import javax.swing.event.EventListenerList;
  47: 
  48: /**
  49:  * An abstract superclass for table and tree cell editors. This provides some
  50:  * common shared functionality.
  51:  *
  52:  * @author Andrew Selkirk
  53:  */
  54: public abstract class AbstractCellEditor
  55:   implements CellEditor, Serializable
  56: {
  57:   private static final long serialVersionUID = -1048006551406220959L;
  58: 
  59:   /**
  60:    * Our Swing event listeners.
  61:    */
  62:   protected EventListenerList listenerList;
  63: 
  64:   /**
  65:    * The cached ChangeEvent.
  66:    */
  67:   protected transient ChangeEvent changeEvent;
  68: 
  69:   /**
  70:    * Creates a new instance of AbstractCellEditor.
  71:    */
  72:   public AbstractCellEditor() 
  73:   {
  74:     listenerList = new EventListenerList();
  75:     changeEvent = new ChangeEvent(this);
  76:   }
  77: 
  78:   /**
  79:    * Returns <code>true</code> if the cell is editable using
  80:    * <code>event</code>, <code>false</code>
  81:    * if it's not. The default behaviour is to return <code>true</code>.
  82:    *
  83:    * @param event an event
  84:    *
  85:    * @return <code>true</code> if the cell is editable using
  86:    *     <code>event</code>, <code>false</code> if it's not
  87:    */
  88:   public boolean isCellEditable(EventObject event) 
  89:   {
  90:     return true;
  91:   } 
  92: 
  93:   /**
  94:    * Returns <code>true</code> if the editing cell should be selected,
  95:    * <code>false</code> otherwise. This is usually returning <code>true</code>,
  96:    * but in some special cases it might be useful not to switch cell selection
  97:    * when editing one cell.
  98:    *
  99:    * @param event an event
 100:    *
 101:    * @return <code>true</code> if the editing cell should be selected,
 102:    *     <code>false</code> otherwise
 103:    */
 104:   public boolean shouldSelectCell(EventObject event) 
 105:   {
 106:     return true;
 107:   }
 108: 
 109:   /**
 110:    * Stop editing the cell and accept any partial value that has been entered
 111:    * into the cell.
 112:    *
 113:    * @return <code>true</code> if editing has been stopped successfully,
 114:    *     <code>false</code>otherwise
 115:    */
 116:   public boolean stopCellEditing() 
 117:   {
 118:     fireEditingStopped();
 119:     return true;
 120:   }
 121: 
 122:   /**
 123:    * Stop editing the cell and do not accept any partial value that has
 124:    * been entered into the cell.
 125:    */
 126:   public void cancelCellEditing() 
 127:   {
 128:     fireEditingCanceled();
 129:   } 
 130: 
 131:   /**
 132:    * Adds a CellEditorListener to the list of CellEditorListeners of this
 133:    * CellEditor.
 134:    *
 135:    * @param listener the CellEditorListener to add
 136:    */
 137:   public void addCellEditorListener(CellEditorListener listener)
 138:   {
 139:     listenerList.add(CellEditorListener.class, listener);
 140:   }
 141: 
 142:   /**
 143:    * Removes the specified CellEditorListener from the list of the
 144:    * CellEditorListeners of this CellEditor.
 145:    *
 146:    * @param listener the CellEditorListener to remove
 147:    */
 148:   public void removeCellEditorListener(CellEditorListener listener)
 149:   {
 150:     listenerList.remove(CellEditorListener.class, listener);
 151:   }
 152:     
 153:   /**
 154:    * Returns the list of CellEditorListeners that have been registered
 155:    * in this CellEditor.
 156:    *
 157:    * @return the list of CellEditorListeners that have been registered
 158:    *     in this CellEditor
 159:    *
 160:    * @since 1.4
 161:    */
 162:   public CellEditorListener[] getCellEditorListeners()
 163:   {
 164:     return (CellEditorListener[]) listenerList.getListeners(
 165:         CellEditorListener.class);
 166:   }
 167: 
 168:   /**
 169:    * Notifies all registered listeners that the editing of the cell has has been
 170:    * stopped.
 171:    */
 172:   protected void fireEditingStopped()
 173:   {
 174:     CellEditorListener[] listeners = getCellEditorListeners();
 175: 
 176:     for (int index = 0; index < listeners.length; index++)
 177:       {
 178:         listeners[index].editingStopped(changeEvent);
 179:       }
 180:   }
 181: 
 182:   /**
 183:    * Notifies all registered listeners that the editing of the cell has
 184:    * has been canceled.
 185:    */
 186:   protected void fireEditingCanceled()
 187:   {
 188:     CellEditorListener[] listeners = getCellEditorListeners();
 189: 
 190:     for (int index = 0; index < listeners.length; index++)
 191:       {
 192:         listeners[index].editingCanceled(changeEvent);
 193:       }
 194:   }
 195: }