#ifndef TPARAMCHANGE_INCLUDED

#define TPARAMCHANGE_INCLUDED

// TnzCore includes

#include "tcommon.h"

#undef DVAPI

#undef DVVAR

#ifdef TPARAM_EXPORTS

#define DVAPI DV_EXPORT_API

#define DVVAR DV_EXPORT_VAR

#else

#define DVAPI DV_IMPORT_API

#define DVVAR DV_IMPORT_VAR

#endif

//===========================================================

//    Forward declarations

class TParam;

//===========================================================

//*****************************************************************************************

//    TParamChange  declaration

//*****************************************************************************************

class DVAPI TParamChange

{

public:

	TParam *m_param; //!< (not owned) The parameter being changed

	double m_firstAffectedFrame,

		m_lastAffectedFrame; //!< First and last frames affected by the change

	bool m_keyframeChanged; //!< Whether a keyframe has been altered by the change

	bool m_dragging;		//!< Whether the change is about a mouse being dragged

	bool m_undoing;			//!< Whether the change is happening within an undo operation

	static double m_minFrame;

	static double m_maxFrame;

public:

	TParamChange(TParam *param,

				 double firstAffectedFrame, double lastAffectedFrame,

				 bool keyframeChanged, bool dragging, bool undoing);

	virtual ~TParamChange() {}

};

//*****************************************************************************************

//    TParamObserver  definition

//*****************************************************************************************

class DVAPI TParamObserver

{

public:

	virtual ~TParamObserver() {}

	virtual void onChange(const TParamChange &) = 0;

};

#endif // TPARAMCHANGE_INCLUDED