#pragma once

#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