clipint.h

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// $Id: clipint.h 1282 2006-06-09 09:46:49Z alex $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
                    Copyright (C) 1993-2006 Xara Group Ltd.
       Copyright on certain contributions may be held in joint with their
              respective authors. See AUTHORS file for details.

LICENSE TO USE AND MODIFY SOFTWARE
----------------------------------

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=================================XARAHEADEREND============================
 */
/*
 * */
// Camelot's Internal clipboard

#ifndef INC_CLIPINT
#define INC_CLIPINT

//#include "document.h" - in camtypes.h [AUTOMATICALLY REMOVED]


class Layer;
class CCamDoc;
class Range; 


/********************************************************************************************
>   class InternalClipboard : public Document

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com> (Connection to ExternalClipboard by Jason, OLE stuff by JustinF)
    Created:    05/07/94 (19/4/95)

    Purpose:    Camelot's internal clipboard document.

                This is a cache, if you like, of the contents of the ExternalClipboard
                
                When Camelot "owns" the external clipboard, the InternalClipboard contains
                the objects which will be pasted into other applications. (When external
                apps paste, they will request that Camelot exports the InternalClipboard
                in some external exchange format)

                When Camelot doesn't own the external clipboard, the InternalClipboard
                will either be empty, or will be a cached copy of the external clipboard
                (if the user has pasted once into Camelot, while the clipboard remains
                unchanged, the internal clipboard will have the internal camelot tree
                representation of the clipboard cached - thus, pasting a .cdr file into
                camelot will only do the slow conversion once, and subsequent pastes
                will be 'native')

    SeeAlso:    ExternalClipboard; Document
*********************************************************************************************/

class InternalClipboard : public Document
{

//  Interface.

public:

    // The identifier's of the two clipboards.
    enum ID { CLIPBOARD, DRAGDROP };

    // Access the the two clipboards through these.
    static InternalClipboard* Instance()    { return pInstance; }
    static InternalClipboard* Other()       { return pOther; }
    static void Swap();
    static ID GetCurrentID();

    // Attributes.
    static BOOL IsEmpty(BOOL AskExternalClipboard = TRUE);
    static void DescribeContents(String_64* Result);
    static DocRect GetObjectsBounds();
    static Layer* GetInsertionLayer();
    static Range* GetClipboardRange()       { return pInstance->pClipboardRange; }

    // Copying.
    static BOOL PrepareForCopy();
    static BOOL CopyInProgress();
    static BOOL CopyObjects(Range& RangeToCopy, Operation * pOp = NULL);
    static BOOL CopyComponentData(BaseDocument* pSrcDoc);
    static BOOL CopyCompleted();

    //Graham 24/4/97
    //A quick way of putting some text on the internal clipboard
    static BOOL CopyText(TCHAR* pBuffer);


    // Pasting.
    static BOOL PrepareForPaste(BOOL* pExternalSource = 0);
    static BOOL PasteCompleted();
    static DocCoord GetOriginalCentrePoint();
    static void SetOriginalCentrePoint(DocCoord NewCentre);
    // Notifications.
    static void Clear();
    static void AttrsHaveChanged(); 


//  Implementation.

public:

    // Startup / shutdown.  These manage the two internal clipboards, Instance and Other.
    static BOOL Initialise();
    static void Deinit();

protected:

    // Creation & destruction.
    InternalClipboard(ID id, BOOL fHide = TRUE);
    virtual ~InternalClipboard();
    virtual BOOL Init(CCamDoc* pOilDoc);

    // RTTI (of sorts).
    virtual BOOL IsNotAClipboard() const    { return FALSE; };
    virtual BOOL IsAClipboard() const       { return TRUE; };

private:

    // Helpers.
    BOOL OnNewClipboardObjects();
    static void DescribeContentsInternal(String_64* Result);

    // Data members.
    static   InternalClipboard* pInstance;      // The only instance of the InternalClipboard
    static   InternalClipboard* pOther;         // the other instance (temp save) of the clipboard
    Range*   pClipboardRange;                   // the other instance's range
    BOOL     ClipOp;                            // TRUE while we're doing a copy operation
    DocCoord dcCentre;                          // centre of copied objects
    ID       m_id;                              // identifier of this clipboard
    BOOL        OriginalCentreLock;             // TRUE when calls to SetOriginalCentrePoint are disallowed
                                                // (only used when clipboard data was from an external source)

    CC_DECLARE_DYNAMIC(InternalClipboard);
        
    friend class ExternalClipboard;
    friend class OpDeleteBitmap;
};

#endif

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