#pragma once

#ifndef EXPRESSIONFIELD_H

#define EXPRESSIONFIELD_H

#include "tgrammar.h"

#include <qwidget></qwidget>

#include <qtextedit></qtextedit>

#undef DVAPI

#undef DVVAR

#ifdef TOONZQT_EXPORTS

#define DVAPI DV_EXPORT_API

#define DVVAR DV_EXPORT_VAR

#else

#define DVAPI DV_IMPORT_API

#define DVVAR DV_IMPORT_VAR

#endif

// forward declaration

class QPushButton;

class QCompleter;

class QListView;

class QModelIndex;

//=============================================================================

namespace DVGui {

//=============================================================================

/*! \class DVGui::ExpressionField

                \brief The ExpressionField allows to edit expressions (i.e.

   formulas as '34*(5-2)')

                Inherits \b QWidget.

*/

class DVAPI ExpressionField final : public QTextEdit {

  Q_OBJECT

  bool m_editing;

  const TSyntax::Grammar *m_grammar;

  class SyntaxHighlighter;

  SyntaxHighlighter *m_syntaxHighlighter;

  QListView *m_completerPopup;

  int m_completerStartPos;

  TSyntax::Grammar::Suggestions m_suggestions;

public:

  ExpressionField(QWidget *parent = 0);

  ~ExpressionField();

  void setExpression(std::string expression);

  std::string getExpression() const;

  void setGrammar(const TSyntax::Grammar *grammar);

  const TSyntax::Grammar *getGrammar() const { return m_grammar; }

private:

  void openCompleterPopup();

  bool updateCompleterPopup();

  void insertCompletion();

  int computeSuggestions();

protected:

  bool event(QEvent *e) override;

  void keyPressEvent(QKeyEvent *e) override;

  void focusInEvent(QFocusEvent *e) override;

  void focusOutEvent(QFocusEvent *e) override;

  void showEvent(QShowEvent *) override;

  void hideEvent(QHideEvent *) override;

  bool eventFilter(QObject *obj, QEvent *e) override;

private slots:

  void onTextChanged();

  void onCursorPositionChanged();

  void insertCompletion(const QModelIndex &index);

signals:

  void expressionChanged();

};

//-----------------------------------------------------------------------------

}  // namespace DVGui

//-----------------------------------------------------------------------------

#endif  // FILEFIELD_H