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