1 /*
2 * Copyright (c) 1997, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.awt.windows;
27
28 import java.awt.Component;
29 import java.awt.Cursor;
30 import java.awt.Image;
31 import java.awt.Point;
32 import java.awt.image.BufferedImage;
33 import java.awt.image.DataBufferInt;
34
35 import java.awt.datatransfer.Transferable;
36
37 import java.awt.dnd.DragGestureEvent;
38 import java.awt.dnd.InvalidDnDOperationException;
39
40 import java.awt.event.InputEvent;
41
42 import java.util.Map;
43
44 import sun.awt.dnd.SunDragSourceContextPeer;
45
46 /**
47 * <p>
48 * TBC
49 * </p>
50 *
51 * @since JDK1.2
52 *
53 */
54
55 final class WDragSourceContextPeer extends SunDragSourceContextPeer {
56 public void startSecondaryEventLoop(){
57 WToolkit.startSecondaryEventLoop();
58 }
59 public void quitSecondaryEventLoop(){
60 WToolkit.quitSecondaryEventLoop();
61 }
62
63 private static final WDragSourceContextPeer theInstance =
64 new WDragSourceContextPeer(null);
65
66 /**
67 * construct a new WDragSourceContextPeer. package private
68 */
69
70 private WDragSourceContextPeer(DragGestureEvent dge) {
71 super(dge);
72 }
73
74 static WDragSourceContextPeer createDragSourceContextPeer(DragGestureEvent dge) throws InvalidDnDOperationException {
75 theInstance.setTrigger(dge);
76 return theInstance;
77 }
78
79 protected void startDrag(Transferable trans,
80 long[] formats, Map formatMap) {
81
82 long nativeCtxtLocal = 0;
83
84 nativeCtxtLocal = createDragSource(getTrigger().getComponent(),
85 trans,
86 getTrigger().getTriggerEvent(),
87 getTrigger().getSourceAsDragGestureRecognizer().getSourceActions(),
88 formats,
89 formatMap);
90
91 if (nativeCtxtLocal == 0) {
92 throw new InvalidDnDOperationException("failed to create native peer");
93 }
94
95 int[] imageData = null;
96 Point op = null;
97
98 Image im = getDragImage();
99 int imageWidth = -1;
100 int imageHeight = -1;
101 if (im != null) {
102 //image is ready (partial images are ok)
103 try{
104 imageWidth = im.getWidth(null);
105 imageHeight = im.getHeight(null);
106 if (imageWidth < 0 || imageHeight < 0) {
107 throw new InvalidDnDOperationException("drag image is not ready");
108 }
109 //We could get an exception from user code here.
110 //"im" and "dragImageOffset" are user-defined objects
111 op = getDragImageOffset(); //op could not be null here
112 BufferedImage bi = new BufferedImage(
113 imageWidth,
114 imageHeight,
115 BufferedImage.TYPE_INT_ARGB);
116 bi.getGraphics().drawImage(im, 0, 0, null);
117
118 //we can get out-of-memory here
119 imageData = ((DataBufferInt)bi.getData().getDataBuffer()).getData();
120 } catch (Throwable ex) {
121 throw new InvalidDnDOperationException("drag image creation problem: " + ex.getMessage());
122 }
123 }
124
125 //We shouldn't have user-level exceptions since now.
126 //Any exception leads to corrupted D'n'D state.
127 setNativeContext(nativeCtxtLocal);
128 WDropTargetContextPeer.setCurrentJVMLocalSourceTransferable(trans);
129
130 if (imageData != null) {
131 doDragDrop(
132 getNativeContext(),
133 getCursor(),
134 imageData,
135 imageWidth, imageHeight,
136 op.x, op.y);
137 } else {
138 doDragDrop(
139 getNativeContext(),
140 getCursor(),
141 null,
142 -1, -1,
143 0, 0);
144 }
145 }
146
147 /**
148 * downcall into native code
149 */
150
151 native long createDragSource(Component component,
152 Transferable transferable,
153 InputEvent nativeTrigger,
154 int actions,
155 long[] formats,
156 Map formatMap);
157
158 /**
159 * downcall into native code
160 */
161
162 native void doDragDrop(
163 long nativeCtxt,
164 Cursor cursor,
165 int[] imageData,
166 int imgWidth, int imgHight,
167 int offsetX, int offsetY);
168
169 protected native void setNativeCursor(long nativeCtxt, Cursor c, int cType);
170
171 }