gui.h

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#ifndef GUI_H
#define GUI_H
 
#include <QMainWindow>
#include <QKeyEvent>
#include <QString>
#include "../mathlib.h"
 
QT_BEGIN_NAMESPACE
namespace Ui { class Gui; }
QT_END_NAMESPACE
 
class Gui : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit Gui(QWidget *parent = nullptr);
    ~Gui();
 
private slots:
    void on_btn_0_clicked();
    void on_btn_1_clicked();
    void on_btn_2_clicked();
    void on_btn_3_clicked();
    void on_btn_4_clicked();
    void on_btn_5_clicked();
    void on_btn_6_clicked();
    void on_btn_7_clicked();
    void on_btn_8_clicked();
    void on_btn_9_clicked();
 
    void on_btn_plus_clicked();
    void on_btn_minus_clicked();
    void on_btn_mul_clicked();
    void on_btn_div_clicked();
    void on_btn_mod_clicked();
    void on_btn_pow_clicked();
    void on_btn_root_clicked();
    void on_btn_fac_clicked();
 
    void on_btn_clear_clicked();
    void on_btn_equal_clicked();
    void on_btn_dot_clicked();
 
private:
    Ui::Gui *ui;
    QString currentExpression;
    bool justEvaluated;
 
    void updateDisplay();
    void showError(mathlib::MathError err);
 
    void keyPressEvent(QKeyEvent *event) override;
 
    bool endsWithOperator() const;
    bool hasOperator() const;
    int  findOperatorPos(QChar op) const;
    void appendDigit(const QString &digit);
    void appendOperator(const QString &op);
};
 
#endif // GUI_H