1/*
2 * Copyright (c) 2011, 2013, 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
26package sun.lwawt.macosx;
27
28import java.awt.*;
29import java.awt.dnd.DropTarget;
30
31import sun.awt.dnd.SunDropTargetContextPeer;
32import sun.awt.dnd.SunDropTargetEvent;
33
34import javax.swing.*;
35
36
37final class CDropTargetContextPeer extends SunDropTargetContextPeer {
38
39    private long    fNativeDropTransfer = 0;
40    private long    fNativeDataAvailable = 0;
41    private Object  fNativeData    = null;
42    private DropTarget insideTarget = null;
43
44    Object awtLockAccess = new Object();
45
46    static CDropTargetContextPeer getDropTargetContextPeer() {
47        return new CDropTargetContextPeer();
48    }
49
50    private CDropTargetContextPeer() {
51        super();
52    }
53
54    // We block, waiting for an empty event to get posted (CToolkit.invokeAndWait)
55    // This is so we finish dispatching DropTarget events before we dispatch the dragDropFinished event (which is a higher priority).
56    private void flushEvents(Component c) {
57        try {
58            LWCToolkit.invokeAndWait(new Runnable() {
59                public synchronized void run() {
60                }
61            }, c);
62        }
63        catch(Exception e) {
64            e.printStackTrace();
65        }
66    }
67
68    protected Object getNativeData(long format) {
69        long nativeDropTarget = this.getNativeDragContext();
70
71        synchronized (awtLockAccess) {
72            fNativeDataAvailable = 0;
73
74            if (fNativeDropTransfer == 0) {
75                fNativeDropTransfer = startTransfer(nativeDropTarget, format);
76            } else {
77                addTransfer(nativeDropTarget, fNativeDropTransfer, format);
78            }
79
80            while (format != fNativeDataAvailable) {
81                try {
82                    awtLockAccess.wait();
83                } catch (Throwable e) {
84                    e.printStackTrace();
85                }
86            }
87        }
88
89        return fNativeData;
90    }
91
92    // We need to take care of dragEnter and dragExit messages because
93    // native system generates them only for heavyweights
94    @Override
95    protected void processMotionMessage(SunDropTargetEvent event, boolean operationChanged) {
96        boolean eventInsideTarget = isEventInsideTarget(event);
97        if (event.getComponent().getDropTarget() == insideTarget) {
98            if (!eventInsideTarget) {
99                processExitMessage(event);
100                return;
101            }
102        } else {
103            if (eventInsideTarget) {
104                processEnterMessage(event);
105            } else {
106                return;
107            }
108        }
109        super.processMotionMessage(event, operationChanged);
110    }
111
112    /**
113     * Could be called when DnD enters a heavyweight or synthesized in processMotionMessage
114     */
115    @Override
116    protected void processEnterMessage(SunDropTargetEvent event) {
117        Component c = event.getComponent();
118        DropTarget dt = event.getComponent().getDropTarget();
119        if (isEventInsideTarget(event)
120                && dt != insideTarget
121                && c.isShowing()
122                && dt != null
123                && dt.isActive()) {
124            insideTarget = dt;
125            super.processEnterMessage(event);
126        }
127    }
128
129    /**
130     * Could be called when DnD exits a heavyweight or synthesized in processMotionMessage
131     */
132    @Override
133    protected void processExitMessage(SunDropTargetEvent event) {
134        if (event.getComponent().getDropTarget() == insideTarget) {
135            insideTarget = null;
136            super.processExitMessage(event);
137        }
138    }
139
140    @Override
141    protected void processDropMessage(SunDropTargetEvent event) {
142        if (isEventInsideTarget(event)) {
143            super.processDropMessage(event);
144            insideTarget = null;
145        }
146    }
147
148    private boolean isEventInsideTarget(SunDropTargetEvent event) {
149        Component eventSource = event.getComponent();
150        Point screenPoint = event.getPoint();
151        SwingUtilities.convertPointToScreen(screenPoint, eventSource);
152        Point locationOnScreen = eventSource.getLocationOnScreen();
153        Rectangle screenBounds = new Rectangle(locationOnScreen.x,
154                                               locationOnScreen.y,
155                                               eventSource.getWidth(),
156                                               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}
201