1 /*
2 * Copyright (c) 2011, 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.lwawt.macosx;
27
28 import java.awt.*;
29 import java.awt.dnd.DropTarget;
30
31 import sun.awt.AWTAccessor;
32 import sun.awt.dnd.SunDropTargetContextPeer;
33 import sun.awt.dnd.SunDropTargetEvent;
34
35 import javax.swing.*;
36
37
38 final class CDropTargetContextPeer extends SunDropTargetContextPeer {
39
40 private long fNativeDropTransfer = 0;
41 private long fNativeDataAvailable = 0;
42 private Object fNativeData = null;
43 private DropTarget insideTarget = null;
44
45 Object awtLockAccess = new Object();
46
47 static CDropTargetContextPeer getDropTargetContextPeer() {
48 return new CDropTargetContextPeer();
49 }
50
51 private CDropTargetContextPeer() {
52 super();
53 }
54
55 // We block, waiting for an empty event to get posted (CToolkit.invokeAndWait)
56 // This is so we finish dispatching DropTarget events before we dispatch the dragDropFinished event (which is a higher priority).
57 private void flushEvents(Component c) {
58 try {
59 LWCToolkit.invokeAndWait(new Runnable() {
60 public synchronized void run() {
61 }
62 }, c);
63 }
64 catch(Exception e) {
65 e.printStackTrace();
66 }
67 }
68
69 protected Object getNativeData(long format) {
70 long nativeDropTarget = this.getNativeDragContext();
71
72 synchronized (awtLockAccess) {
73 fNativeDataAvailable = 0;
74
75 if (fNativeDropTransfer == 0) {
76 fNativeDropTransfer = startTransfer(nativeDropTarget, format);
77 } else {
78 addTransfer(nativeDropTarget, fNativeDropTransfer, format);
79 }
80
81 while (format != fNativeDataAvailable) {
82 try {
83 awtLockAccess.wait();
84 } catch (Throwable e) {
85 e.printStackTrace();
86 }
87 }
88 }
89
90 return fNativeData;
91 }
92
93 // We need to take care of dragEnter and dragExit messages because
94 // native system generates them only for heavyweights
95 @Override
96 protected void processMotionMessage(SunDropTargetEvent event, boolean operationChanged) {
97 boolean eventInsideTarget = isEventInsideTarget(event);
98 if(event.getComponent().getDropTarget() == insideTarget) {
99 if(!eventInsideTarget) {
100 processExitMessage(event);
101 return;
102 }
103 } else {
104 if(eventInsideTarget) {
105 processEnterMessage(event);
106 } else {
107 return;
108 }
109 }
110 super.processMotionMessage(event, operationChanged);
111 }
112
113 /**
114 * Could be called when DnD enters a heavyweight or synthesized in processMotionMessage
115 */
116 @Override
117 protected void processEnterMessage(SunDropTargetEvent event) {
118 Component c = event.getComponent();
119 DropTarget dt = event.getComponent().getDropTarget();
120 if (isEventInsideTarget(event)
121 && dt != insideTarget
122 && c.isShowing()
123 && dt != null
124 && dt.isActive()) {
125 insideTarget = dt;
126 super.processEnterMessage(event);
127 }
128 }
129
130 /**
131 * Could be called when DnD exits a heavyweight or synthesized in processMotionMessage
132 */
133 @Override
134 protected void processExitMessage(SunDropTargetEvent event) {
135 if(!isEventInsideTarget(event)
136 && event.getComponent().getDropTarget() == insideTarget) {
137 insideTarget = null;
138 super.processExitMessage(event);
139 }
140 }
141
142 @Override
143 protected void processDropMessage(SunDropTargetEvent event) {
144 if(isEventInsideTarget(event)) {
145 super.processDropMessage(event);
146 insideTarget = null;
147 }
148 }
149
150 private boolean isEventInsideTarget(SunDropTargetEvent event) {
151 Component eventSource = event.getComponent();
152 Point screenPoint = event.getPoint();
153 SwingUtilities.convertPointToScreen(screenPoint, eventSource);
154 Rectangle screenBounds = new Rectangle(eventSource.getLocationOnScreen().x,
155 eventSource.getLocationOnScreen().y,
156 eventSource.getWidth(), eventSource.getHeight());
157 return screenBounds.contains(screenPoint);
158 }
159
160 @Override
161 protected int postDropTargetEvent(Component component, int x, int y, int dropAction,
162 int actions, long[] formats, long nativeCtxt, int eventID,
163 boolean dispatchType) {
164 // On MacOS X all the DnD events should be synchronous
165 return super.postDropTargetEvent(component, x, y, dropAction, actions, formats, nativeCtxt,
166 eventID, SunDropTargetContextPeer.DISPATCH_SYNC);
167 }
168
169 // Signal drop complete:
170 protected void doDropDone(boolean success, int dropAction, boolean isLocal) {
171 long nativeDropTarget = this.getNativeDragContext();
172
173 dropDone(nativeDropTarget, fNativeDropTransfer, isLocal, success, dropAction);
174 }
175
176 // Notify transfer complete - this is an upcall from getNativeData's native calls:
177 private void newData(long format, byte[] data) {
178 fNativeDataAvailable = format;
179 fNativeData = data;
180
181 awtLockAccess.notifyAll();
182 }
183
184 // Notify transfer failed - this is an upcall from getNativeData's native calls:
185 private void transferFailed(long format) {
186 fNativeDataAvailable = format;
187 fNativeData = null;
188
189 awtLockAccess.notifyAll();
190 }
191
192 // Schedule a native dnd transfer:
193 private native long startTransfer(long nativeDropTarget, long format);
194
195 // Schedule a native dnd data transfer:
196 private native void addTransfer(long nativeDropTarget, long nativeDropTransfer, long format);
197
198 // Notify drop completed:
199 private native void dropDone(long nativeDropTarget, long nativeDropTransfer, boolean isLocal, boolean success, int dropAction);
200 }