Source for java.awt.dnd.DragSourceAdapter

   1: /* DragSourceAdapter.java -- drag-and-drop listener adapter
   2:    Copyright (C) 2002, 2005  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 java.awt.dnd;
  40: 
  41: /**
  42:  * This class implements <code>DragSourceListener</code> and
  43:  * <code>DragSourceMotionListener</code>, and implements all methods
  44:  * with empty bodies.  This allows a listener interested in implementing only
  45:  * a subset of these interfaces to extend this class and override only the
  46:  * desired methods.
  47:  *
  48:  * @author Eric Blake (ebb9@email.byu.edu)
  49:  * @see DragSourceEvent
  50:  * @see DragSourceListener
  51:  * @see DragSourceMotionListener
  52:  * @since 1.4
  53:  * @status updated to 1.4
  54:  */
  55: public abstract class DragSourceAdapter
  56:   implements DragSourceListener, DragSourceMotionListener
  57: {
  58:   /**
  59:    * Default constructor.
  60:    */
  61:   public DragSourceAdapter()
  62:   {
  63:   }
  64: 
  65:   /**
  66:    * Called when the cursor hotspot enters a drop site which will accept the
  67:    * drag.
  68:    *
  69:    * @param e the event
  70:    */
  71:   public void dragEnter(DragSourceDragEvent e)
  72:   {
  73:   }
  74: 
  75:   /**
  76:    * Called when the cursor hotspot moves inside of a drop site which will
  77:    * accept the drag.
  78:    *
  79:    * @param e the event
  80:    */
  81:   public void dragOver(DragSourceDragEvent e)
  82:   {
  83:   }
  84: 
  85:   /**
  86:    * Called whenever the mouse is moved during a drag-and-drop operation.
  87:    *
  88:    * @param e the event
  89:    */
  90:   public void dragMouseMoved(DragSourceDragEvent e)
  91:   {
  92:   }
  93: 
  94:   /**
  95:    * Called when the user modifies the drop gesture. This is often the case
  96:    * when additional mouse or key events are received during the drag.
  97:    *
  98:    * @param e the event
  99:    */
 100:   public void dropActionChanged(DragSourceDragEvent e)
 101:   {
 102:   }
 103: 
 104:   /**
 105:    * Called when the cursor hotspot moves outside of a drop site which will
 106:    * accept the drag. This could also happen if the drop site is no longer
 107:    * active, or no longer accepts the drag.
 108:    *
 109:    * @param e the event
 110:    */
 111:   public void dragExit(DragSourceEvent e)
 112:   {
 113:   }
 114: 
 115:   /**
 116:    * Called when the drag and drop operation is complete. After this event,
 117:    * <code>getDropSuccess</code> of the event is valid, and
 118:    * <code>getDropAction</code> holds the action requested by the drop site.
 119:    * Furthermore, the <code>DragSourceContext</code> is invalidated.
 120:    *
 121:    * @param e the event
 122:    */
 123:   public void dragDropEnd(DragSourceDropEvent e)
 124:   {
 125:   }
 126: } // class DragSourceAdapter