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<pre> /****************************************************************************
**
** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
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** and appearing in the file LICENSE.GPL included in the packaging of
** this file. Please review the following information to ensure GNU
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****************************************************************************/
#ifndef CALCULATOR_H
#define CALCULATOR_H
#include <QDialog>
class QLineEdit;
class Button;
class Calculator : public QDialog
{
Q_OBJECT
public:
Calculator(QWidget *parent = 0);
protected:
bool eventFilter(QObject *target, QEvent *event);
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();
private:
Button *createButton(const QString &text, const QColor &color,
const char *member);
void abortOperation();
bool calculate(double rightOperand, const QString &pendingOperator);
double sumInMemory;
double sumSoFar;
double factorSoFar;
QString pendingAdditiveOperator;
QString pendingMultiplicativeOperator;
bool waitingForOperand;
QLineEdit *display;
enum { NumDigitButtons = 10 };
Button *digitButtons[NumDigitButtons];
Button *pointButton;
Button *changeSignButton;
Button *backspaceButton;
Button *clearButton;
Button *clearAllButton;
Button *clearMemoryButton;
Button *readMemoryButton;
Button *setMemoryButton;
Button *addToMemoryButton;
Button *divisionButton;
Button *timesButton;
Button *minusButton;
Button *plusButton;
Button *squareRootButton;
Button *powerButton;
Button *reciprocalButton;
Button *equalButton;
};
#endif</pre>
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