// $Revision: 1.4 $
//------------------------------------------------------------------------------
//
// Copyright (C) 1994, 1995 Taligent, Inc. All rights reserved.
//
// Project:			TaligentSelectionTool
// File:			AutoDropAcceptor.h
// Build/Version:	1.0.0
//
// Description:		Provides an implementation that can be used to implement 
//					MDropAcceptors.
//
//------------------------------------------------------------------------------

#ifndef TaligentSamples_AUTODROPACCEPTOR
#define TaligentSamples_AUTODROPACCEPTOR

class TInsertionTarget;
class TTypeDescription;
class TGPoint;
class TScrapItem;
class MDataExchanger;
#ifndef Taligent_COREPRIMITIVECLASSES
#include <Taligent/CorePrimitiveClasses.h>
#endif
#ifndef Taligent_DELETERFOR
#include <Taligent/DeleterFor.h>
#endif
#ifndef TaligentSamples_INSERTIONTARGET
#include "InsertionTarget.h"
#endif

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

class MAutoDropAcceptor {
public:
							MAutoDropAcceptor();
							MAutoDropAcceptor(TInsertionTarget* target);
	virtual					~MAutoDropAcceptor();

	virtual void			AdoptTarget(TInsertionTarget* target);

   	virtual void			DragItemEntered(const TGPoint& whereEntered,
   								const TSequenceOf<TTypeDescription>& availableTypes);
   	virtual void			DragItemMoved(const TGPoint& whereMoved,
   								const TSequenceOf<TTypeDescription>& availableTypes);
  	virtual void			DragItemExited(const TGPoint& whereExited);
	virtual	bool			ChoosePreferredType(const TGPoint& whereDropped,
								const TSequenceOf<TTypeDescription>& availableTypes,
								TTypeDescription& chosenType) const;
	virtual	bool			AcceptDrop(const TGPoint& whereDropped,
								const TTypeDescription& type,
								const TScrapItem& item);

protected:

	void					AdjustFeedbackGraphic(const TSequenceOf<TTypeDescription>& types);
	TTypeDescription*		NegotiateType(MDataExchanger* exchanger,
								const TSequenceOf<TTypeDescription>& availableTypes) const;

private:
	MAutoDropAcceptor&		operator=(const MAutoDropAcceptor& source);
	
	TDeleterFor<TInsertionTarget>		fTarget;
};
	
#endif