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      1 /*
      2  * Copyright (C) 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "web/DragClientImpl.h"
     33 
     34 #include "core/clipboard/Clipboard.h"
     35 #include "core/clipboard/DataObject.h"
     36 #include "core/frame/LocalFrame.h"
     37 #include "platform/DragImage.h"
     38 #include "platform/geometry/IntSize.h"
     39 #include "platform/graphics/skia/NativeImageSkia.h"
     40 #include "public/platform/WebCommon.h"
     41 #include "public/platform/WebDragData.h"
     42 #include "public/platform/WebImage.h"
     43 #include "public/platform/WebPoint.h"
     44 #include "public/web/WebDragOperation.h"
     45 #include "public/web/WebViewClient.h"
     46 #include "web/WebViewImpl.h"
     47 #include "wtf/Assertions.h"
     48 #include "wtf/RefPtr.h"
     49 
     50 using namespace WebCore;
     51 
     52 namespace blink {
     53 
     54 DragDestinationAction DragClientImpl::actionMaskForDrag(DragData*)
     55 {
     56     if (m_webView->client() && m_webView->client()->acceptsLoadDrops())
     57         return DragDestinationActionAny;
     58 
     59     return static_cast<DragDestinationAction>(
     60         DragDestinationActionDHTML | DragDestinationActionEdit);
     61 }
     62 
     63 void DragClientImpl::startDrag(DragImage* dragImage,
     64                                const IntPoint& dragImageOrigin,
     65                                const IntPoint& eventPos,
     66                                Clipboard* clipboard,
     67                                LocalFrame* frame,
     68                                bool isLinkDrag)
     69 {
     70     // Add a ref to the frame just in case a load occurs mid-drag.
     71     RefPtr<LocalFrame> frameProtector = frame;
     72 
     73     WebDragData dragData(clipboard->dataObject());
     74     WebDragOperationsMask dragOperationMask = static_cast<WebDragOperationsMask>(clipboard->sourceOperation());
     75     WebImage image;
     76     IntSize offsetSize(eventPos - dragImageOrigin);
     77     WebPoint offsetPoint(offsetSize.width(), offsetSize.height());
     78 
     79     if (dragImage) {
     80         float resolutionScale = dragImage->resolutionScale();
     81         if (m_webView->deviceScaleFactor() != resolutionScale) {
     82             ASSERT(resolutionScale > 0);
     83             float scale = m_webView->deviceScaleFactor() / resolutionScale;
     84             dragImage->scale(scale, scale);
     85         }
     86         image = dragImage->bitmap();
     87     }
     88 
     89     m_webView->startDragging(frame, dragData, dragOperationMask, image, offsetPoint);
     90 }
     91 
     92 } // namespace blink
     93