#ifndef TDOUBLEPARAMRELAYPROPERTY_H
#define TDOUBLEPARAMRELAYPROPERTY_H

// TnzCore includes
#include "tproperty.h"

// TnzBase includes
#include "tdoubleparam.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

//*****************************************************************************
//    TDoubleParamRelayProperty  declaration
//*****************************************************************************

//! The TDoubleParamRelayProperty is a TProperty heir which can be used as
//! intermediary between a TDoubleParam instance and its GUI viewers.
class DVAPI TDoubleParamRelayProperty : public TProperty, public TParamObserver
{
	TDoubleParamP m_param; //!< The referenced param
	double m_frame;		   //!< Frame at which m_param returns values

public:
	class Visitor
	{
	public:
		virtual void visit(TDoubleParamRelayProperty *p) = 0;
	};

public:
	TDoubleParamRelayProperty(const std::string &name, TDoubleParamP param = TDoubleParamP());
	~TDoubleParamRelayProperty();

	TDoubleParamRelayProperty(const TDoubleParamRelayProperty &other);
	TDoubleParamRelayProperty &operator=(const TDoubleParamRelayProperty &other);

	TProperty *clone() const;
	std::string getValueAsString();

	void setParam(const TDoubleParamP &param);
	const TDoubleParamP &getParam() const { return m_param; }

	void setValue(double v);
	double getValue() const;

	double frame() const { return m_frame; }
	double &frame() { return m_frame; }

	void accept(TProperty::Visitor &v);

	void onChange(const TParamChange &);
};

#endif // TDOUBLEPARAMRELAYPROPERTY_H