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 
  30 import sun.awt.dnd.SunDropTargetContextPeer;
  31 import sun.awt.dnd.SunDropTargetEvent;
  32 
  33 import javax.swing.*;
  34 
  35 
  36 final class CDropTargetContextPeer extends SunDropTargetContextPeer {
  37 
  38     private long    fNativeDropTransfer = 0;
  39     private long    fNativeDataAvailable = 0;
  40     private Object  fNativeData    = null;
  41     private boolean insideTarget = false;
  42 
  43     Object awtLockAccess = new Object();
  44 
  45     static CDropTargetContextPeer getDropTargetContextPeer() {
  46         return new CDropTargetContextPeer();
  47     }
  48 
  49     private CDropTargetContextPeer() {
  50         super();
  51     }
  52 
  53     // We block, waiting for an empty event to get posted (CToolkit.invokeAndWait)
  54     // This is so we finish dispatching DropTarget events before we dispatch the dragDropFinished event (which is a higher priority).
  55     private void flushEvents(Component c) {
  56        LWCToolkit.flushPendingEventsOnAppkit(c);








  57     }
  58 
  59     protected Object getNativeData(long format) {
  60         long nativeDropTarget = this.getNativeDragContext();
  61 
  62         synchronized (awtLockAccess) {
  63             fNativeDataAvailable = 0;
  64 
  65             if (fNativeDropTransfer == 0) {
  66                 fNativeDropTransfer = startTransfer(nativeDropTarget, format);
  67             } else {
  68                 addTransfer(nativeDropTarget, fNativeDropTransfer, format);
  69             }
  70 
  71             while (format != fNativeDataAvailable) {
  72                 try {
  73                     awtLockAccess.wait();
  74                 } catch (Throwable e) {
  75                     e.printStackTrace();
  76                 }
  77             }
  78         }
  79 
  80         return fNativeData;
  81     }
  82 
  83     // We need to take care of dragExit message because for some reason it is not being
  84     // generated for lightweight components
  85     @Override
  86     protected void processMotionMessage(SunDropTargetEvent event, boolean operationChanged) {
  87         Component eventSource = (Component)event.getComponent();
  88         Point screenPoint = event.getPoint();
  89         SwingUtilities.convertPointToScreen(screenPoint, eventSource);
  90         Rectangle screenBounds = new Rectangle(eventSource.getLocationOnScreen().x,
  91                 eventSource.getLocationOnScreen().y,
  92                 eventSource.getWidth(), eventSource.getHeight());
  93         if(insideTarget) {
  94             if(!screenBounds.contains(screenPoint)) {
  95                 processExitMessage(event);
  96                 insideTarget = false;
  97                 return;
  98             }
  99         } else {
 100             if(screenBounds.contains(screenPoint)) {
 101                 processEnterMessage(event);
 102                 insideTarget = true;
 103             } else {
 104                 return;
 105             }
 106         }
 107         super.processMotionMessage(event, operationChanged);
 108     }
 109 
 110     @Override
 111     protected void processDropMessage(SunDropTargetEvent event) {
 112         Component eventSource = (Component)event.getComponent();
 113         Point screenPoint = event.getPoint();
 114         SwingUtilities.convertPointToScreen(screenPoint, eventSource);
 115         Rectangle screenBounds = new Rectangle(eventSource.getLocationOnScreen().x,
 116                 eventSource.getLocationOnScreen().y,
 117                 eventSource.getWidth(), eventSource.getHeight());
 118         if(screenBounds.contains(screenPoint)) {
 119             super.processDropMessage(event);
 120         }
 121     }
 122 
 123     // Signal drop complete:
 124     protected void doDropDone(boolean success, int dropAction, boolean isLocal) {
 125         long nativeDropTarget = this.getNativeDragContext();
 126 
 127         dropDone(nativeDropTarget, fNativeDropTransfer, isLocal, success, dropAction);
 128     }
 129 
 130     // Notify transfer complete - this is an upcall from getNativeData's native calls:
 131     private void newData(long format, byte[] data) {
 132         fNativeDataAvailable = format;
 133         fNativeData          = data;
 134 
 135         awtLockAccess.notifyAll();
 136     }
 137 
 138     // Notify transfer failed - this is an upcall from getNativeData's native calls:
 139     private void transferFailed(long format) {
 140         fNativeDataAvailable = format;
 141         fNativeData          = null;
 142 
 143         awtLockAccess.notifyAll();
 144     }
 145 
 146     // Schedule a native dnd transfer:
 147     private native long startTransfer(long nativeDropTarget, long format);
 148 
 149     // Schedule a native dnd data transfer:
 150     private native void addTransfer(long nativeDropTarget, long nativeDropTransfer, long format);
 151 
 152     // Notify drop completed:
 153     private native void dropDone(long nativeDropTarget, long nativeDropTransfer, boolean isLocal, boolean success, int dropAction);
 154 }
--- EOF ---