// $Revision: 1.4 $
//------------------------------------------------------------------------------
//
// Copyright (C) 1994, 1995 Taligent, Inc. All rights reserved.
//
// Project:			TaligentSelectionTool
// File:			Feedbacker.h
// Build/Version:	1.0.0
//
// Description:		MFeedbacker class defines a protocol and provides an 
//					implementation for feedback management.
//
//------------------------------------------------------------------------------

#ifndef TaligentSamples_FEEDBACKER
#define TaligentSamples_FEEDBACKER

class MFeedbacker;

#ifndef Taligent_DEQUEOF
#include <Taligent/DequeOf.h>
#endif

#ifndef Taligent_VIEWHANDLE
#include <Taligent/ViewHandle.h>
#endif

#ifndef Taligent_SYNCHRONIZATION
#include <Taligent/Synchronization.h>
#endif

class MGraphic;					//from <Taligent/Graphics.h>
class TGrafPort;				//from <Taligent/GrafPort.h>
class TGArea;					//from <Taligent/AreaGeometries.h>

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

class MFeedbacker {
public:
								MFeedbacker(const TViewHandle& view);
	virtual						~MFeedbacker();
	
	void						AdoptFeedback(MGraphic* graphic);
	MGraphic*					OrphanFeedback(const MGraphic& graphic);
	MGraphic*					ReplaceFeedback(const MGraphic& oldFeedback, 
									MGraphic* newFeedbackToAdopt);

	bool						DrawFeedback(TGrafPort& port) const;
	
	TViewHandle					GetFeedbackView() const;

protected:
	virtual void				HandleHideCurrentSelectionFeedback();
	virtual void				HandleShowCurrentSelectionFeedback();
	virtual void				HandleFeedbackChanged(const TGArea& area);
	
private:
	TDequeOf<MGraphic>			fFeedback;
	TMonitorLock				fFeedbackLock;
	TViewHandle					fView;
};

#endif