#ifndef TDOUBLEKEYFRAME_INCLUDED

#define TDOUBLEKEYFRAME_INCLUDED

#include "tgeometry.h"

#include "tfilepath.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

class TOStream;

class TIStream;

class TUnit;

class DVAPI TDoubleKeyframe

{

public:

	enum Type {

		None = 0,

		Constant,

		Linear,

		SpeedInOut,

		EaseInOut,

		EaseInOutPercentage,

		Exponential,

		Expression,

		File,

		SimilarShape

	};

	class DVAPI FileParams

	{

	public:

		TFilePath m_path;

		int m_fieldIndex;

		FileParams() : m_path(), m_fieldIndex(0) {}

	};

	static inline bool isKeyframeBased(int type)

	{

		return type < TDoubleKeyframe::Expression && type != TDoubleKeyframe::SimilarShape;

	}

	//private:

	Type m_type;

	Type m_prevType;

	double m_frame;

	double m_value;

	bool m_isKeyframe;

	int m_step;

	TPointD m_speedIn, m_speedOut;

	bool m_linkedHandles;

	std::string m_expressionText;

	FileParams m_fileParams;

	std::string m_unitName; // file/expression only

	double m_similarShapeOffset;

	void saveData(TOStream &os) const;

	void loadData(TIStream &is);

public:

	TDoubleKeyframe(double frame = 0, double value = 0);

	~TDoubleKeyframe();

	bool operator<(const TDoubleKeyframe &k) const { return m_frame < k.m_frame; }

};

#endif