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. */ 037 038 039 package 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 */ 055 public 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