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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 "DragActions.h"
     30 #include "DragImage.h"
     31 #include "IntPoint.h"
     32 #include "KURL.h"
     33 
     34 namespace WebCore {
     35 
     36     class Clipboard;
     37     class Document;
     38     class DragClient;
     39     class DragData;
     40     class Element;
     41     class Frame;
     42     class Image;
     43     class IntRect;
     44     class Node;
     45     class Page;
     46     class PlatformMouseEvent;
     47     class Range;
     48     class SelectionController;
     49 
     50     class DragController {
     51         WTF_MAKE_NONCOPYABLE(DragController); WTF_MAKE_FAST_ALLOCATED;
     52     public:
     53         DragController(Page*, DragClient*);
     54         ~DragController();
     55         DragClient* client() const { return m_client; }
     56 
     57         DragOperation dragEntered(DragData*);
     58         void dragExited(DragData*);
     59         DragOperation dragUpdated(DragData*);
     60         bool performDrag(DragData*);
     61 
     62         // FIXME: It should be possible to remove a number of these accessors once all
     63         // drag logic is in WebCore.
     64         void setDidInitiateDrag(bool initiated) { m_didInitiateDrag = initiated; }
     65         bool didInitiateDrag() const { return m_didInitiateDrag; }
     66         void setIsHandlingDrag(bool handling) { m_isHandlingDrag = handling; }
     67         bool isHandlingDrag() const { return m_isHandlingDrag; }
     68         DragOperation sourceDragOperation() const { return m_sourceDragOperation; }
     69         const KURL& draggingImageURL() const { return m_draggingImageURL; }
     70         void setDragOffset(const IntPoint& offset) { m_dragOffset = offset; }
     71         const IntPoint& dragOffset() const { return m_dragOffset; }
     72         DragSourceAction dragSourceAction() const { return m_dragSourceAction; }
     73 
     74         Document* documentUnderMouse() const { return m_documentUnderMouse.get(); }
     75         DragDestinationAction dragDestinationAction() const { return m_dragDestinationAction; }
     76         DragSourceAction delegateDragSourceAction(const IntPoint& pagePoint);
     77 
     78         bool mayStartDragAtEventLocation(const Frame*, const IntPoint& framePos, Node*);
     79         void dragEnded();
     80 
     81         void placeDragCaret(const IntPoint&);
     82 
     83         bool startDrag(Frame* src, Clipboard*, DragOperation srcOp, const PlatformMouseEvent& dragEvent, const IntPoint& dragOrigin, bool isDHTMLDrag);
     84         static const IntSize& maxDragImageSize();
     85 
     86         static const int LinkDragBorderInset;
     87         static const int MaxOriginalImageArea;
     88         static const int DragIconRightInset;
     89         static const int DragIconBottomInset;
     90         static const float DragImageAlpha;
     91 
     92     private:
     93         bool dispatchTextInputEventFor(Frame*, DragData*);
     94         bool canProcessDrag(DragData*);
     95         bool concludeEditDrag(DragData*);
     96         DragOperation dragEnteredOrUpdated(DragData*);
     97         DragOperation operationForLoad(DragData*);
     98         bool tryDocumentDrag(DragData*, DragDestinationAction, DragOperation&);
     99         bool tryDHTMLDrag(DragData*, DragOperation&);
    100         DragOperation dragOperation(DragData*);
    101         void cancelDrag();
    102         bool dragIsMove(SelectionController*, DragData*);
    103         bool isCopyKeyDown(DragData*);
    104 
    105         void mouseMovedIntoDocument(Document*);
    106 
    107         IntRect selectionDraggingRect(Frame*);
    108         bool doDrag(Frame* src, Clipboard* clipboard, DragImageRef dragImage, const KURL& linkURL, const KURL& imageURL, Node* node, IntPoint& dragLoc, IntPoint& dragImageOffset);
    109         void doImageDrag(Element*, const IntPoint&, const IntRect&, Clipboard*, Frame*, IntPoint&);
    110         void doSystemDrag(DragImageRef, const IntPoint&, const IntPoint&, Clipboard*, Frame*, bool forLink);
    111         void cleanupAfterSystemDrag();
    112 
    113         Page* m_page;
    114         DragClient* m_client;
    115 
    116         RefPtr<Document> m_documentUnderMouse; // The document the mouse was last dragged over.
    117         RefPtr<Document> m_dragInitiator; // The Document (if any) that initiated the drag.
    118 
    119         DragDestinationAction m_dragDestinationAction;
    120         DragSourceAction m_dragSourceAction;
    121         bool m_didInitiateDrag;
    122         bool m_isHandlingDrag;
    123         DragOperation m_sourceDragOperation; // Set in startDrag when a drag starts from a mouse down within WebKit
    124         IntPoint m_dragOffset;
    125         KURL m_draggingImageURL;
    126     };
    127 
    128 }
    129 
    130 #endif
    131