#pragma once

#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