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         try {
  57             LWCToolkit.invokeAndWait(new Runnable() {
  58                 public synchronized void run() {
  59                 }
  60             }, c);
  61         }
  62         catch(Exception e) {
  63             e.printStackTrace();
  64         }
  65     }
  66 
  67     protected Object getNativeData(long format) {
  68         long nativeDropTarget = this.getNativeDragContext();
  69 
  70         synchronized (awtLockAccess) {
  71             fNativeDataAvailable = 0;
  72 
  73             if (fNativeDropTransfer == 0) {
  74                 fNativeDropTransfer = startTransfer(nativeDropTarget, format);
  75             } else {
  76                 addTransfer(nativeDropTarget, fNativeDropTransfer, format);
  77             }
  78 
  79             while (format != fNativeDataAvailable) {
  80                 try {
  81                     awtLockAccess.wait();
  82                 } catch (Throwable e) {
  83                     e.printStackTrace();
  84                 }
  85             }
  86         }
  87 
  88         return fNativeData;
  89     }
  90 
  91     // We need to take care of dragExit message because for some reason it is not being
  92     // generated for lightweight components
  93     @Override
  94     protected void processMotionMessage(SunDropTargetEvent event, boolean operationChanged) {
  95         Component eventSource = (Component)event.getComponent();
  96         Point screenPoint = event.getPoint();
  97         SwingUtilities.convertPointToScreen(screenPoint, eventSource);
  98         Rectangle screenBounds = new Rectangle(eventSource.getLocationOnScreen().x,
  99                 eventSource.getLocationOnScreen().y,
 100                 eventSource.getWidth(), eventSource.getHeight());
 101         if(insideTarget) {
 102             if(!screenBounds.contains(screenPoint)) {
 103                 processExitMessage(event);
 104                 insideTarget = false;
 105                 return;
 106             }
 107         } else {
 108             if(screenBounds.contains(screenPoint)) {
 109                 processEnterMessage(event);
 110                 insideTarget = true;
 111             } else {
 112                 return;
 113             }
 114         }
 115         super.processMotionMessage(event, operationChanged);
 116     }
 117 
 118     @Override
 119     protected void processDropMessage(SunDropTargetEvent event) {
 120         Component eventSource = (Component)event.getComponent();
 121         Point screenPoint = event.getPoint();
 122         SwingUtilities.convertPointToScreen(screenPoint, eventSource);
 123         Rectangle screenBounds = new Rectangle(eventSource.getLocationOnScreen().x,
 124                 eventSource.getLocationOnScreen().y,
 125                 eventSource.getWidth(), eventSource.getHeight());
 126         if(screenBounds.contains(screenPoint)) {
 127             super.processDropMessage(event);
 128         }
 129     }
 130 
 131     // Signal drop complete:
 132     protected void doDropDone(boolean success, int dropAction, boolean isLocal) {
 133         long nativeDropTarget = this.getNativeDragContext();
 134 
 135         dropDone(nativeDropTarget, fNativeDropTransfer, isLocal, success, dropAction);
 136     }
 137 
 138     // Notify transfer complete - this is an upcall from getNativeData's native calls:
 139     private void newData(long format, byte[] data) {
 140         fNativeDataAvailable = format;
 141         fNativeData          = data;
 142 
 143         awtLockAccess.notifyAll();
 144     }
 145 
 146     // Notify transfer failed - this is an upcall from getNativeData's native calls:
 147     private void transferFailed(long format) {
 148         fNativeDataAvailable = format;
 149         fNativeData          = null;
 150 
 151         awtLockAccess.notifyAll();
 152     }
 153 
 154     // Schedule a native dnd transfer:
 155     private native long startTransfer(long nativeDropTarget, long format);
 156 
 157     // Schedule a native dnd data transfer:
 158     private native void addTransfer(long nativeDropTarget, long nativeDropTransfer, long format);
 159 
 160     // Notify drop completed:
 161     private native void dropDone(long nativeDropTarget, long nativeDropTransfer, boolean isLocal, boolean success, int dropAction);
 162 }
--- EOF ---