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      1 /*
      2  * Copyright (C) 2007, 2009 Apple 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef DragController_h
     27 #define DragController_h
     28 
     29 #include "core/page/DragActions.h"
     30 #include "platform/geometry/IntPoint.h"
     31 #include "platform/heap/Handle.h"
     32 #include "platform/weborigin/KURL.h"
     33 #include "wtf/Forward.h"
     34 
     35 namespace blink {
     36 
     37 class DataTransfer;
     38 class Document;
     39 class DragClient;
     40 class DragData;
     41 class DragImage;
     42 struct DragSession;
     43 class DragState;
     44 class LocalFrame;
     45 class FrameSelection;
     46 class HTMLInputElement;
     47 class Node;
     48 class Page;
     49 class PlatformMouseEvent;
     50 
     51 class DragController FINAL : public NoBaseWillBeGarbageCollectedFinalized<DragController> {
     52     WTF_MAKE_NONCOPYABLE(DragController);
     53     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     54 public:
     55     ~DragController();
     56 
     57     static PassOwnPtrWillBeRawPtr<DragController> create(Page*, DragClient*);
     58 
     59     DragSession dragEntered(DragData*);
     60     void dragExited(DragData*);
     61     DragSession dragUpdated(DragData*);
     62     bool performDrag(DragData*);
     63 
     64     enum SelectionDragPolicy {
     65         ImmediateSelectionDragResolution,
     66         DelayedSelectionDragResolution,
     67     };
     68     Node* draggableNode(const LocalFrame*, Node*, const IntPoint&, SelectionDragPolicy, DragSourceAction&) const;
     69     void dragEnded();
     70 
     71     bool populateDragDataTransfer(LocalFrame* src, const DragState&, const IntPoint& dragOrigin);
     72     bool startDrag(LocalFrame* src, const DragState&, const PlatformMouseEvent& dragEvent, const IntPoint& dragOrigin);
     73 
     74     void trace(Visitor*);
     75 
     76     static const int DragIconRightInset;
     77     static const int DragIconBottomInset;
     78 
     79 private:
     80     DragController(Page*, DragClient*);
     81 
     82     bool dispatchTextInputEventFor(LocalFrame*, DragData*);
     83     bool canProcessDrag(DragData*);
     84     bool concludeEditDrag(DragData*);
     85     DragSession dragEnteredOrUpdated(DragData*);
     86     DragOperation operationForLoad(DragData*);
     87     bool tryDocumentDrag(DragData*, DragDestinationAction, DragSession&);
     88     bool tryDHTMLDrag(DragData*, DragOperation&);
     89     DragOperation dragOperation(DragData*);
     90     void cancelDrag();
     91     bool dragIsMove(FrameSelection&, DragData*);
     92     bool isCopyKeyDown(DragData*);
     93 
     94     void mouseMovedIntoDocument(Document*);
     95 
     96     void doSystemDrag(DragImage*, const IntPoint& dragLocation, const IntPoint& dragOrigin, DataTransfer*, LocalFrame*, bool forLink);
     97     void cleanupAfterSystemDrag();
     98 
     99     RawPtrWillBeMember<Page> m_page;
    100     DragClient* m_client;
    101 
    102     RefPtrWillBeMember<Document> m_documentUnderMouse; // The document the mouse was last dragged over.
    103     RefPtrWillBeMember<Document> m_dragInitiator; // The Document (if any) that initiated the drag.
    104     RefPtrWillBeMember<HTMLInputElement> m_fileInputElementUnderMouse;
    105     bool m_documentIsHandlingDrag;
    106 
    107     DragDestinationAction m_dragDestinationAction;
    108     bool m_didInitiateDrag;
    109 };
    110 
    111 } // namespace blink
    112 
    113 #endif // DragController_h
    114