001    /* DragSourceAdapter.java -- drag-and-drop listener adapter
002       Copyright (C) 2002, 2005  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    package java.awt.dnd;
039    
040    /**
041     * This class implements <code>DropTargetListener</code>, and implements all methods
042     * with empty bodies.  This allows a listener interested in implementing only
043     * a subset of these interfaces to extend this class and override only the
044     * desired methods.
045     *
046     * @author Michael Koch (konqueror@gmx.de)
047     * @since 1.4
048     * @status updated to 1.4
049     */
050    public abstract class DropTargetAdapter
051      implements DropTargetListener
052    {
053      /**
054       * Default constructor.
055       */
056      public DropTargetAdapter()
057      {
058      }
059    
060      /**
061       * Called when the cursor hotspot enters a drop site which will accept the
062       * drag.
063       *
064       * @param e the event
065       */
066      public void dragEnter (DropTargetDragEvent e)
067      {
068      }
069    
070      /**
071       * Called when the cursor hotspot moves inside of a drop site which will
072       * accept the drag.
073       *
074       * @param e the event
075       */
076      public void dragOver (DropTargetDragEvent e)
077      {
078      }
079    
080      /**
081       * Called when the user modifies the drop gesture. This is often the case
082       * when additional mouse or key events are received during the drag.
083       *
084       * @param e the event
085       */
086      public void dropActionChanged (DropTargetDragEvent e)
087      {
088      }
089    
090      /**
091       * Called when the cursor hotspot moves outside of a drop site which will
092       * accept the drag. This could also happen if the drop site is no longer
093       * active, or no longer accepts the drag.
094       *
095       * @param e the event
096       */
097      public void dragExit(DropTargetEvent e)
098      {
099      }
100    } // class DropTargetAdapter