1 /*
2 * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * AWT Button is a DragSource and also a transferable object
26 */
27
28 import java.awt.*;
29 import java.awt.datatransfer.*;
30 import java.awt.dnd.*;
31 import java.io.*;
32
33 class DnDSource extends Button implements Transferable,
34 DragGestureListener,
35 DragSourceListener {
36 private DataFlavor df;
37 private transient int dropAction;
38 private final int dragOperation = DnDConstants.ACTION_COPY | DnDConstants.ACTION_MOVE | DnDConstants.ACTION_LINK;
39 DragSource dragSource = new DragSource();
40
41 DnDSource(String label) {
42 super(label);
43 setBackground(Color.yellow);
44 setForeground(Color.blue);
45 df = new DataFlavor(DnDSource.class, "DnDSource");
46
47 dragSource.createDefaultDragGestureRecognizer(
48 this,
49 dragOperation,
50 this
51 );
52 dragSource.addDragSourceListener(this);
53 }
54
55 public void changeCursor(
56 DragSourceContext dsc,
57 int ra
58 ) {
59 java.awt.Cursor c = null;
60 if ((ra & DnDConstants.ACTION_LINK) == DnDConstants.ACTION_LINK)
61 c = DragSource.DefaultLinkDrop;
62 else if ((ra & DnDConstants.ACTION_MOVE) == DnDConstants.ACTION_MOVE)
63 c = MyCursor.MOVE;//DragSource.DefaultMoveDrop;
64 else if ((ra & DnDConstants.ACTION_COPY) == DnDConstants.ACTION_COPY)
65 c = MyCursor.COPY;
66 else
67 c = MyCursor.NO_DROP;
68 dsc.setCursor(c);
69 }
70
71 /**
72 * a Drag gesture has been recognized
73 */
74
75 public void dragGestureRecognized(DragGestureEvent dge) {
76 System.out.println("starting Drag");
77 try {
78 if (DragSource.isDragImageSupported()) {
79 System.out.println("starting Imaged Drag");
80 dge.startDrag(
81 null,
82 new ImageGenerator(50, 100, new Color(0xff, 0xff, 0xff, 0x00) ) {
83 @Override public void paint(Graphics gr) {
84 gr.translate(width/2, height/2);
85 ((Graphics2D)gr).setStroke(new BasicStroke(3));
86 int R = width/4+5;
87 gr.setColor(new Color(0x00, 0x00, 0xff, 0x7F));
88 gr.fillRect(-R, -R, 2*R, 2*R);
89 gr.setColor(new Color(0x00, 0x00, 0xff, 0xff));
90 gr.drawRect(-R, -R, 2*R, 2*R);
91
92
93 gr.translate(10, -10);
94 R -= 5;
95 gr.setColor(Color.RED);
96 gr.fillOval(-R, -R, 2*R, 2*R);
97 gr.setColor(Color.MAGENTA);
98 gr.drawOval(-R, -R, 2*R, 2*R);
99 }
100 }.getImage(),
101 new Point(15, 40),
102 this,
103 this);
104 } else {
105 dge.startDrag(
106 null,
107 this,
108 this);
109 }
110 } catch (InvalidDnDOperationException e) {
111 e.printStackTrace();
112 }
113 }
114
115 /**
116 * as the hotspot enters a platform dependent drop site
117 */
118
119 public void dragEnter(DragSourceDragEvent dsde) {
120 System.out.println("[Source] dragEnter");
121 changeCursor(
122 dsde.getDragSourceContext(),
123 dsde.getUserAction() & dsde.getDropAction()
124 );
125 }
126
127 /**
128 * as the hotspot moves over a platform dependent drop site
129 */
130 public void dragOver(DragSourceDragEvent dsde) {
131 System.out.println("[Source] dragOver");
132 changeCursor(
133 dsde.getDragSourceContext(),
134 dsde.getUserAction() & dsde.getDropAction()
135 );
136 dropAction = dsde.getUserAction() & dsde.getDropAction();
137 System.out.println("dropAction = " + dropAction);
138 }
139
140 /**
141 * as the hotspot exits a platform dependent drop site
142 */
143 public void dragExit(DragSourceEvent dse) {
144 System.out.println("[Source] dragExit");
145 changeCursor(
146 dse.getDragSourceContext(),
147 DnDConstants.ACTION_NONE
148 );
149 }
150
151 /**
152 * as the operation changes
153 */
154 public void dragGestureChanged(DragSourceDragEvent dsde) {
155 System.out.println("[Source] dragGestureChanged");
156 changeCursor(
157 dsde.getDragSourceContext(),
158 dsde.getUserAction() & dsde.getDropAction()
159 );
160 dropAction = dsde.getUserAction() & dsde.getDropAction();
161 System.out.println("dropAction = " + dropAction);
162 }
163
164
165 /**
166 * as the operation completes
167 */
168 public void dragDropEnd(DragSourceDropEvent dsde) {
169 System.out.println("[Source] dragDropEnd");
170 }
171
172 public void dropActionChanged(DragSourceDragEvent dsde) {
173 System.out.println("[Source] dropActionChanged");
174 dropAction = dsde.getUserAction() & dsde.getDropAction();
175 System.out.println("dropAction = " + dropAction);
176 }
177
178 public DataFlavor[] getTransferDataFlavors() {
179 return new DataFlavor[]{df};
180 }
181
182 public boolean isDataFlavorSupported(DataFlavor sdf) {
183 return df.equals(sdf);
184 }
185
186 public Object getTransferData(DataFlavor tdf) throws UnsupportedFlavorException, IOException {
187 Object copy = null;
188 if( !df.equals(tdf) ){
189 throw new UnsupportedFlavorException(tdf);
190 }
191 Container parent = getParent();
192 switch (dropAction) {
193 case DnDConstants.ACTION_COPY:
194 try {
195 copy = this.clone();
196 } catch (CloneNotSupportedException e) {
197 ByteArrayOutputStream baos = new ByteArrayOutputStream();
198 ObjectOutputStream oos = new ObjectOutputStream(baos);
199
200 oos.writeObject(this);
201 ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
202 ObjectInputStream ois = new ObjectInputStream(bais);
203 try {
204 copy = ois.readObject();
205 } catch (ClassNotFoundException cnfe) {
206 // do nothing
207 }
208 }
209 parent.add(this);
210 return copy;
211
212 case DnDConstants.ACTION_MOVE:
213 synchronized (this) {
214 if (parent != null) {
215 parent.remove(this);
216 Label label = new Label("[empty]");
217 label.setBackground(Color.cyan);
218 label.setBounds(this.getBounds());
219 parent.add(label);
220 }
221 }
222 return this;
223
224 case DnDConstants.ACTION_LINK:
225 return this;
226
227 default:
228 return null;
229 }
230
231 }
232 }
233