#ifndef TNZ_EXPRESSIONFIELD_INCLUDED

#define TNZ_EXPRESSIONFIELD_INCLUDED

#include "tw/textfield.h"

#undef DVAPI

#undef DVVAR

#ifdef TWIN_EXPORTS

#define DVAPI DV_EXPORT_API

#define DVVAR DV_EXPORT_VAR

#else

#define DVAPI DV_IMPORT_API

#define DVVAR DV_IMPORT_VAR

#endif

#ifdef WIN32

#pragma warning(push)

#pragma warning(disable : 4251)

#endif

// forward declaration

namespace TSyntax

{

class Parser;

class Grammar;

}

class DVAPI TExpressionField : public TTextField

{

public:

	class Listener

	{

	public:

		virtual void onExpressionChange(string s, bool isValid) = 0;

		virtual ~Listener() {}

	};

	TSyntax::Parser *m_parser;

	Listener *m_listener;

	void apply();

public:

	TExpressionField(TWidget *parent, string name = "expressionField");

	~TExpressionField();

	void setGrammar(TSyntax::Grammar *grammar);

	TSyntax::Grammar *getGrammar() const;

	void setListener(Listener *listener)

	{

		m_listener = listener;

	}

	void keyDown(int key, TUINT32 status, const TPoint &p);

	void drawFieldText(const TPoint &origin, wstring text);

	string getError() const;

};

#ifdef WIN32

#pragma warning(pop)

#endif

#endif