DragController.h 5.48 KB
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/*
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 * Copyright (C) 2007, 2009 Apple Inc. All rights reserved.
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 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#ifndef DragController_h
#define DragController_h

#include "DragActions.h"
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#include "DragImage.h"
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#include "IntPoint.h"
#include "KURL.h"
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namespace WebCore {

    class Clipboard;
    class Document;
    class DragClient;
    class DragData;
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    struct DragState;
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    class Element;
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    class Frame;
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    class FrameSelection;
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    class Image;
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    class IntRect;
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    class Node;
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    class Page;
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    class PlatformMouseEvent;
    class Range;
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    class DragController {
        WTF_MAKE_NONCOPYABLE(DragController); WTF_MAKE_FAST_ALLOCATED;
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    public:
        DragController(Page*, DragClient*);
        ~DragController();
        DragClient* client() const { return m_client; }

        DragOperation dragEntered(DragData*);
        void dragExited(DragData*);
        DragOperation dragUpdated(DragData*);
        bool performDrag(DragData*);
        
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        // FIXME: It should be possible to remove a number of these accessors once all
        // drag logic is in WebCore.
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        void setDidInitiateDrag(bool initiated) { m_didInitiateDrag = initiated; } 
        bool didInitiateDrag() const { return m_didInitiateDrag; }
        void setIsHandlingDrag(bool handling) { m_isHandlingDrag = handling; }
        bool isHandlingDrag() const { return m_isHandlingDrag; }
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        DragOperation sourceDragOperation() const { return m_sourceDragOperation; }
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        const KURL& draggingImageURL() const { return m_draggingImageURL; }
        void setDragOffset(const IntPoint& offset) { m_dragOffset = offset; }
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        const IntPoint& dragOffset() const { return m_dragOffset; }
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        DragSourceAction dragSourceAction() const { return m_dragSourceAction; }
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        Document* documentUnderMouse() const { return m_documentUnderMouse.get(); }
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        DragDestinationAction dragDestinationAction() const { return m_dragDestinationAction; }
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        DragSourceAction delegateDragSourceAction(const IntPoint& pagePoint);
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        Node* draggableNode(const Frame*, Node*, const IntPoint&, DragState&) const;
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        void dragEnded();
        
        void placeDragCaret(const IntPoint&);
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        bool startDrag(Frame* src, const DragState&, DragOperation srcOp, const PlatformMouseEvent& dragEvent, const IntPoint& dragOrigin);
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        static const IntSize& maxDragImageSize();
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        static const int LinkDragBorderInset;
        static const int MaxOriginalImageArea;
        static const int DragIconRightInset;
        static const int DragIconBottomInset;        
        static const float DragImageAlpha;
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    private:
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        bool dispatchTextInputEventFor(Frame*, DragData*);
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        bool canProcessDrag(DragData*);
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        bool concludeEditDrag(DragData*);
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        DragOperation dragEnteredOrUpdated(DragData*);
        DragOperation operationForLoad(DragData*);
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        bool tryDocumentDrag(DragData*, DragDestinationAction, DragOperation&);
        bool tryDHTMLDrag(DragData*, DragOperation&);
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        DragOperation dragOperation(DragData*);
        void cancelDrag();
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        bool dragIsMove(FrameSelection*, DragData*);
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        bool isCopyKeyDown(DragData*);
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        void mouseMovedIntoDocument(Document*);

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        IntRect selectionDraggingRect(Frame*);
        bool doDrag(Frame* src, Clipboard* clipboard, DragImageRef dragImage, const KURL& linkURL, const KURL& imageURL, Node* node, IntPoint& dragLoc, IntPoint& dragImageOffset);
        void doImageDrag(Element*, const IntPoint&, const IntRect&, Clipboard*, Frame*, IntPoint&);
        void doSystemDrag(DragImageRef, const IntPoint&, const IntPoint&, Clipboard*, Frame*, bool forLink);
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        void cleanupAfterSystemDrag();
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        Page* m_page;
        DragClient* m_client;
        
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        RefPtr<Document> m_documentUnderMouse; // The document the mouse was last dragged over.
        RefPtr<Document> m_dragInitiator; // The Document (if any) that initiated the drag.
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        DragDestinationAction m_dragDestinationAction;
        DragSourceAction m_dragSourceAction;
        bool m_didInitiateDrag;
        bool m_isHandlingDrag;
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        DragOperation m_sourceDragOperation; // Set in startDrag when a drag starts from a mouse down within WebKit
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        IntPoint m_dragOffset;
        KURL m_draggingImageURL;
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    };

}

#endif