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    protected Object getNativeData(long format) {
55        long nativeDropTarget = this.getNativeDragContext();
56
57        synchronized (awtLockAccess) {
58            fNativeDataAvailable = 0;
59
60            if (fNativeDropTransfer == 0) {
61                fNativeDropTransfer = startTransfer(nativeDropTarget, format);
62            } else {
63                addTransfer(nativeDropTarget, fNativeDropTransfer, format);
64            }
65
66            while (format != fNativeDataAvailable) {
67                try {
68                    awtLockAccess.wait();
69                } catch (Throwable e) {
70                    e.printStackTrace();
71                }
72            }
73        }
74
75        return fNativeData;
76    }
77
78    // We need to take care of dragEnter and dragExit messages because
79    // native system generates them only for heavyweights
80    @Override
81    protected void processMotionMessage(SunDropTargetEvent event, boolean operationChanged) {
82        boolean eventInsideTarget = isEventInsideTarget(event);
83        if (event.getComponent().getDropTarget() == insideTarget) {
84            if (!eventInsideTarget) {
85                processExitMessage(event);
86                return;
87            }
88        } else {
89            if (eventInsideTarget) {
90                processEnterMessage(event);
91            } else {
92                return;
93            }
94        }
95        super.processMotionMessage(event, operationChanged);
96    }
97
98    /**
99     * Could be called when DnD enters a heavyweight or synthesized in processMotionMessage
100     */
101    @Override
102    protected void processEnterMessage(SunDropTargetEvent event) {
103        Component c = event.getComponent();
104        DropTarget dt = event.getComponent().getDropTarget();
105        if (isEventInsideTarget(event)
106                && dt != insideTarget
107                && c.isShowing()
108                && dt != null
109                && dt.isActive()) {
110            insideTarget = dt;
111            super.processEnterMessage(event);
112        }
113    }
114
115    /**
116     * Could be called when DnD exits a heavyweight or synthesized in processMotionMessage
117     */
118    @Override
119    protected void processExitMessage(SunDropTargetEvent event) {
120        if (event.getComponent().getDropTarget() == insideTarget) {
121            insideTarget = null;
122            super.processExitMessage(event);
123        }
124    }
125
126    @Override
127    protected void processDropMessage(SunDropTargetEvent event) {
128        if (isEventInsideTarget(event)) {
129            super.processDropMessage(event);
130            insideTarget = null;
131        }
132    }
133
134    private boolean isEventInsideTarget(SunDropTargetEvent event) {
135        Component eventSource = event.getComponent();
136        Point screenPoint = event.getPoint();
137        SwingUtilities.convertPointToScreen(screenPoint, eventSource);
138        Point locationOnScreen = eventSource.getLocationOnScreen();
139        Rectangle screenBounds = new Rectangle(locationOnScreen.x,
140                                               locationOnScreen.y,
141                                               eventSource.getWidth(),
142                                               eventSource.getHeight());
143        return screenBounds.contains(screenPoint);
144    }
145
146    @Override
147    protected int postDropTargetEvent(Component component, int x, int y, int dropAction,
148                                      int actions, long[] formats, long nativeCtxt, int eventID,
149                                      boolean dispatchType) {
150        // On MacOS X all the DnD events should be synchronous
151        return super.postDropTargetEvent(component, x, y, dropAction, actions, formats, nativeCtxt,
152                eventID, SunDropTargetContextPeer.DISPATCH_SYNC);
153    }
154
155    // Signal drop complete:
156    protected void doDropDone(boolean success, int dropAction, boolean isLocal) {
157        long nativeDropTarget = this.getNativeDragContext();
158
159        dropDone(nativeDropTarget, fNativeDropTransfer, isLocal, success, dropAction);
160    }
161
162    // Notify transfer complete - this is an upcall from getNativeData's native calls:
163    private void newData(long format, byte[] data) {
164        fNativeDataAvailable = format;
165        fNativeData          = data;
166
167        awtLockAccess.notifyAll();
168    }
169
170    // Notify transfer failed - this is an upcall from getNativeData's native calls:
171    private void transferFailed(long format) {
172        fNativeDataAvailable = format;
173        fNativeData          = null;
174
175        awtLockAccess.notifyAll();
176    }
177
178    // Schedule a native dnd transfer:
179    private native long startTransfer(long nativeDropTarget, long format);
180
181    // Schedule a native dnd data transfer:
182    private native void addTransfer(long nativeDropTarget, long nativeDropTransfer, long format);
183
184    // Notify drop completed:
185    private native void dropDone(long nativeDropTarget, long nativeDropTransfer, boolean isLocal, boolean success, int dropAction);
186}
187