1 /* DragSourceListener.java -- listen to events during the drag 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 import java.util.EventListener; 42 43 /** 44 * This class allows an object to listen for drag and drop events. It can 45 * be used to provide appropriate feedback for "drag over" actions. You can 46 * also use a <code>DragSourceAdapter</code> to filter the events you are 47 * interested in. 48 * 49 * @author Eric Blake (ebb9@email.byu.edu) 50 * @since 1.2 51 * @status updated to 1.4 52 */ 53 public interface DragSourceListener extends EventListener 54 { 55 /** 56 * Called when the cursor hotspot enters a drop site which will accept the 57 * drag. 58 * 59 * @param e the drag source drag event 60 */ dragEnter(DragSourceDragEvent e)61 void dragEnter(DragSourceDragEvent e); 62 63 /** 64 * Called when the cursor hotspot moves inside of a drop site which will 65 * accept the drag. 66 * 67 * @param e the drag source drag event 68 */ dragOver(DragSourceDragEvent e)69 void dragOver(DragSourceDragEvent e); 70 71 /** 72 * Called when the user modifies the drop gesture. This is often the case 73 * when additional mouse or key events are received during the drag. 74 * 75 * @param e the drag source drag event 76 */ dropActionChanged(DragSourceDragEvent e)77 void dropActionChanged(DragSourceDragEvent e); 78 79 /** 80 * Called when the cursor hotspot moves outside of a drop site which will 81 * accept the drag. This could also happen if the drop site is no longer 82 * active, or no longer accepts the drag. 83 * 84 * @param e the drag source drag event 85 */ dragExit(DragSourceEvent e)86 void dragExit(DragSourceEvent e); 87 88 /** 89 * Called when the drag and drop operation is complete. After this event, 90 * <code>getDropSuccess</code> of the event is valid, and 91 * <code>getDropAction</code> holds the action requested by the drop site. 92 * Furthermore, the <code>DragSourceContext</code> is invalidated. 93 * 94 * @param e the drag source drag event 95 */ dragDropEnd(DragSourceDropEvent e)96 void dragDropEnd(DragSourceDropEvent e); 97 } // interface DragSourceListener 98