1 /* DragSourceContext.java --
2 Copyright (C) 2002 Free Software Foundation
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., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 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.awt.Component;
42 import java.awt.Cursor;
43 import java.awt.Image;
44 import java.awt.Point;
45 import java.awt.datatransfer.Transferable;
DnDEventMulticaster(EventListener a, EventListener b)46 import java.awt.dnd.peer.DragSourceContextPeer;
47 import java.io.Serializable;
48 import java.util.TooManyListenersException;
49
50 /**
add(DragSourceListener a, DragSourceListener b)51 * @since 1.2
52 */
53 public class DragSourceContext
54 implements DragSourceListener, DragSourceMotionListener, Serializable
55 {
56 /**
57 * Compatible with JDK 1.2+
58 */
59 static final long serialVersionUID = -115407898692194719L;
60
61 protected static final int DEFAULT = 0;
62 protected static final int ENTER = 1;
63 protected static final int OVER = 2;
64 protected static final int CHANGED = 3;
65
66 private DragSourceContextPeer peer;
67 private Cursor cursor;
68 private Transferable transferable;
69 private DragGestureEvent trigger;
70 private DragSourceListener dragSourceListener;
71 private boolean useCustomCursor; // FIXME: currently unused but needed for serialization.
72 private int sourceActions; // FIXME: currently unused but needed for serialization.
73 private Image image;
74 private Point offset;
75
76 /**
77 * Initializes a drag source context.
78 *
79 * @exception IllegalArgumentException If Component or DragSource of trigger
80 * are null, the drag action for the trigger event is DnDConstants.ACTION_NONE
81 * or if the source actions for the DragGestureRecognizer associated with the
82 * trigger event are equal to DnDConstants.ACTION_NONE.
83 * @exception NullPointerException If peer or trigger is null.
84 */
85 public DragSourceContext (DragSourceContextPeer peer,
86 DragGestureEvent trigger, Cursor cursor,
87 Image image, Point offset, Transferable trans,
88 DragSourceListener dsl)
89 {
90 if (peer == null
91 || trigger == null)
92 throw new NullPointerException ();
93
94 if (trigger.getComponent () == null
95 || trigger.getDragSource () == null
96 || trigger.getDragAction () == DnDConstants.ACTION_NONE
97 || trigger.getSourceAsDragGestureRecognizer ()
98 .getSourceActions () == DnDConstants.ACTION_NONE)
99 throw new IllegalArgumentException ();
100
101 this.peer = peer;
102 this.trigger = trigger;
103 this.cursor = cursor;
104 this.image = image;
105 this.offset = offset;
106 this.transferable = trans;
107 this.dragSourceListener = dsl;
108
109 throw new Error ("not implemented");
110 }
111
112 public DragSource getDragSource()
113 {
114 return trigger.getDragSource ();
115 }
116
117 public Component getComponent()
118 {
119 return trigger.getComponent ();
120 }
121
122 public DragGestureEvent getTrigger()
123 {
124 return trigger;
125 }
126
127 public int getSourceActions()
128 {
129 return trigger.getSourceAsDragGestureRecognizer ().getSourceActions ();
130 }
131
132 public void setCursor (Cursor cursor)
133 {
134 this.cursor = cursor;
135 // FIXME: Check if we need to do more here
136 }
137
138 public Cursor getCursor()
139 {
140 return cursor;
141 }
142
143 /**
144 * Adds a <code>DragSourceListener</code>.
145 *
146 * @exception TooManyListenersException If a <code>DragSourceListener</code>
147 * has already been added.
148 */
149 public void addDragSourceListener (DragSourceListener dsl)
150 throws TooManyListenersException
151 {
152 if (dragSourceListener != null)
153 throw new TooManyListenersException ();
154
155 dragSourceListener = dsl;
156 }
157
158 public void removeDragSourceListener (DragSourceListener dsl)
159 {
160 if (dragSourceListener == dsl)
161 dragSourceListener = null;
162 }
163
164 public void transferablesFlavorsChanged()
165 {
166 }
167
168 public void dragEnter(DragSourceDragEvent e)
169 {
170 }
171
172 public void dragOver(DragSourceDragEvent e)
173 {
174 }
175
176 public void dragExit(DragSourceEvent e)
177 {
178 }
179
180 public void dropActionChanged(DragSourceDragEvent e)
181 {
182 }
183
184 public void dragDropEnd(DragSourceDropEvent e)
185 {
186 }
187
188 public void dragMouseMoved(DragSourceDragEvent e)
189 {
190 }
191
192 public Transferable getTransferable()
193 {
194 return transferable;
195 }
196
197 protected void updateCurrentCursor(int dropOp, int targetAct, int status)
198 {
199 }
200 } // class DragSourceContext
201