// $Revision: 1.4 $
//------------------------------------------------------------------------------
//
// Copyright (C) 1994, 1995 Taligent, Inc. All rights reserved.
//
// Project:			TaligentSelectionTool
// File:			SimpleDragAndDropItem.h
// Build/Version:	1.0.0
//
// Description:		TDragAndDropItem is abstract class that encapsulates the complete set of
//					representations of a logically dragged item. It is what is provided on the drag
//					source side to a drag and drop interactor. TDragAndDropItem can intuitively be
//					thought of as representing an internal collection of TScrapItems.
//					CopyAvailableTypes can then be explained as providing the sum collection of
//					available types providable by the logical collection of scrap items. 
//					FindItemMatchingDescription returns a pointer to the scrap item that represents
//					the specified type description. Both of these functions are pure abstract..
//
//------------------------------------------------------------------------------

#ifndef Taligent_SIMPLEDRAGANDDROPITEM
#define Taligent_SIMPLEDRAGANDDROPITEM

class TSimpleDragAndDropItem;

#ifndef Taligent_DRAGANDDROP
#include <Taligent/DragAndDrop.h>
#endif

#ifndef Taligent_SCRAPITEM
#include <Taligent/ScrapItem.h>
#endif


//................................................................................

class TSimpleDragAndDropItem : public TDragAndDropItem {
public:
	MCollectibleDeclarationsMacro(TSimpleDragAndDropItem);

public:
								TSimpleDragAndDropItem(const TViewHandle& viewForActions);
								TSimpleDragAndDropItem(const TSimpleDragAndDropItem& source);
							    ~TSimpleDragAndDropItem();

	TSimpleDragAndDropItem&		operator=(const TSimpleDragAndDropItem& source);
	virtual	TStream&			operator>>=(TStream& toStream) const;
	virtual	TStream&			operator<<=(TStream& fromStream);

	// Overrides
	virtual	void				CopyAvailableTypes(TSequenceOf<TTypeDescription>& result,
									TMemoryHeap* whichHeap = NIL) const;
	virtual	TScrapItem*			FindItemMatchingDescription(const TTypeDescription& theDescription);

	// New Functions
	virtual	void				AdoptScrapItem(TScrapItem* scrapItem);

protected:
								TSimpleDragAndDropItem();

	void						CopyDictionaryAndScraps(const TDequeOf<TScrapItem>& otherScraps);

private:
	enum Version				{kOriginalVersion};

	TDictionaryOf<TTypeDescription, TScrapItem>	fDictionary;
	TDequeOf<TScrapItem>		fScraps;
};


#endif