001/* DragSourceAdapter.java -- drag-and-drop listener adapter 002 Copyright (C) 2002, 2005 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 java.awt.dnd; 040 041/** 042 * This class implements <code>DragSourceListener</code> and 043 * <code>DragSourceMotionListener</code>, and implements all methods 044 * with empty bodies. This allows a listener interested in implementing only 045 * a subset of these interfaces to extend this class and override only the 046 * desired methods. 047 * 048 * @author Eric Blake (ebb9@email.byu.edu) 049 * @see DragSourceEvent 050 * @see DragSourceListener 051 * @see DragSourceMotionListener 052 * @since 1.4 053 * @status updated to 1.4 054 */ 055public abstract class DragSourceAdapter 056 implements DragSourceListener, DragSourceMotionListener 057{ 058 /** 059 * Default constructor. 060 */ 061 public DragSourceAdapter() 062 { 063 } 064 065 /** 066 * Called when the cursor hotspot enters a drop site which will accept the 067 * drag. 068 * 069 * @param e the event 070 */ 071 public void dragEnter(DragSourceDragEvent e) 072 { 073 } 074 075 /** 076 * Called when the cursor hotspot moves inside of a drop site which will 077 * accept the drag. 078 * 079 * @param e the event 080 */ 081 public void dragOver(DragSourceDragEvent e) 082 { 083 } 084 085 /** 086 * Called whenever the mouse is moved during a drag-and-drop operation. 087 * 088 * @param e the event 089 */ 090 public void dragMouseMoved(DragSourceDragEvent e) 091 { 092 } 093 094 /** 095 * Called when the user modifies the drop gesture. This is often the case 096 * when additional mouse or key events are received during the drag. 097 * 098 * @param e the event 099 */ 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