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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 WebCore {
     36 
     37     class Clipboard;
     38     class Document;
     39     class DragClient;
     40     class DragData;
     41     class DragImage;
     42     struct DragSession;
     43     class DragState;
     44     class Element;
     45     class LocalFrame;
     46     class FrameSelection;
     47     class HTMLInputElement;
     48     class Image;
     49     class IntRect;
     50     class Node;
     51     class Page;
     52     class PlatformMouseEvent;
     53     class Range;
     54 
     55     class DragController FINAL : public NoBaseWillBeGarbageCollectedFinalized<DragController> {
     56         WTF_MAKE_NONCOPYABLE(DragController);
     57         WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     58     public:
     59         ~DragController();
     60 
     61         static PassOwnPtrWillBeRawPtr<DragController> create(Page*, DragClient*);
     62 
     63         DragSession dragEntered(DragData*);
     64         void dragExited(DragData*);
     65         DragSession dragUpdated(DragData*);
     66         bool performDrag(DragData*);
     67 
     68         enum SelectionDragPolicy {
     69             ImmediateSelectionDragResolution,
     70             DelayedSelectionDragResolution,
     71         };
     72         Node* draggableNode(const LocalFrame*, Node*, const IntPoint&, SelectionDragPolicy, DragSourceAction&) const;
     73         void dragEnded();
     74 
     75         bool populateDragClipboard(LocalFrame* src, const DragState&, const IntPoint& dragOrigin);
     76         bool startDrag(LocalFrame* src, const DragState&, const PlatformMouseEvent& dragEvent, const IntPoint& dragOrigin);
     77 
     78         void trace(Visitor*);
     79 
     80         static const int DragIconRightInset;
     81         static const int DragIconBottomInset;
     82 
     83     private:
     84         DragController(Page*, DragClient*);
     85 
     86         bool dispatchTextInputEventFor(LocalFrame*, DragData*);
     87         bool canProcessDrag(DragData*);
     88         bool concludeEditDrag(DragData*);
     89         DragSession dragEnteredOrUpdated(DragData*);
     90         DragOperation operationForLoad(DragData*);
     91         bool tryDocumentDrag(DragData*, DragDestinationAction, DragSession&);
     92         bool tryDHTMLDrag(DragData*, DragOperation&);
     93         DragOperation dragOperation(DragData*);
     94         void cancelDrag();
     95         bool dragIsMove(FrameSelection&, DragData*);
     96         bool isCopyKeyDown(DragData*);
     97 
     98         void mouseMovedIntoDocument(Document*);
     99 
    100         void doSystemDrag(DragImage*, const IntPoint& dragLocation, const IntPoint& dragOrigin, Clipboard*, LocalFrame*, bool forLink);
    101         void cleanupAfterSystemDrag();
    102 
    103         RawPtrWillBeMember<Page> m_page;
    104         DragClient* m_client;
    105 
    106         RefPtrWillBeMember<Document> m_documentUnderMouse; // The document the mouse was last dragged over.
    107         RefPtrWillBeMember<Document> m_dragInitiator; // The Document (if any) that initiated the drag.
    108         RefPtrWillBeMember<HTMLInputElement> m_fileInputElementUnderMouse;
    109         bool m_documentIsHandlingDrag;
    110 
    111         DragDestinationAction m_dragDestinationAction;
    112         bool m_didInitiateDrag;
    113     };
    114 
    115 }
    116 
    117 #endif
    118