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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#ifndef CALCULATOR_H
#define CALCULATOR_H
#include <QWidget>
QT_BEGIN_NAMESPACE
class QLineEdit;
QT_END_NAMESPACE
class Button;
//! [0]
class Calculator : public QWidget
{
Q_OBJECT
public:
Calculator(QWidget *parent = nullptr);
private slots:
void digitClicked();
void unaryOperatorClicked();
void additiveOperatorClicked();
void multiplicativeOperatorClicked();
void equalClicked();
void pointClicked();
void changeSignClicked();
void backspaceClicked();
void clear();
void clearAll();
void clearMemory();
void readMemory();
void setMemory();
void addToMemory();
//! [0]
//! [1]
private:
//! [1] //! [2]
template<typename PointerToMemberFunction>
Button *createButton(const QString &text, const PointerToMemberFunction &member);
void abortOperation();
bool calculate(double rightOperand, const QString &pendingOperator);
//! [2]
//! [3]
double sumInMemory;
//! [3] //! [4]
double sumSoFar;
//! [4] //! [5]
double factorSoFar;
//! [5] //! [6]
QString pendingAdditiveOperator;
//! [6] //! [7]
QString pendingMultiplicativeOperator;
//! [7] //! [8]
bool waitingForOperand;
//! [8]
//! [9]
QLineEdit *display;
//! [9] //! [10]
enum { NumDigitButtons = 10 };
Button *digitButtons[NumDigitButtons];
};
//! [10]
#endif
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