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/*
* calculator.h (based on kmymoneycalculator.h, by Thomas Baumgart)
*
* (c) 2002-2004,2008-2010 by Jeremy Bowman <jmbowman@alum.mit.edu>
* (c) 2000-2002 by Michael Edwardes <mte@users.sourceforge.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
/** @file calculator.h
* Header file for Calculator
*/
#ifndef CALCULATOR_H
#define CALCULATOR_H
#include "pbdialog.h"
class QLabel;
class QAbstractButton;
/**
* This class implements a simple electronic calculator with the
* ability of addition, subtraction, multiplication and division
* and percentage calculation. Memory locations are not available.
*
* The first operand and operation can be loaded from an external
* source to switch from an edit-widget to the calculator widget
* without the user having to re-type the data. See setInitialValues()
* for details.
*/
class Calculator : public PBDialog {
Q_OBJECT
public:
Calculator(QWidget* parent = 0);
const QString result() const;
void setInitialValue(const QString& value);
protected:
void keyPressEvent(QKeyEvent* ev);
protected slots:
void digitClicked(int button);
void calculationClicked(int button);
void decimalClicked();
void plusminusClicked();
void clearClicked();
void clearAllClicked();
void percentClicked();
void changeDisplay(const QString& str);
private:
QString operand; /**< The current (second) operand */
QString m_result; /**< The last result */
double op1; /**< The numeric representation of the first operand */
int op; /**< The operation to be performed between the first and the second operand */
QLabel *display; /**< A pointer to the display area */
QAbstractButton *buttons[20]; /**< Pointers to the various buttons of the calculator */
/**
* The values used for the various keys internally
*/
enum {
/* 0-9 are used by digits */
DECIMAL = 10,
/*
* make sure, that PLUS through EQUAL remain in
* the order they are. Otherwise, check the calculation
* signal mapper
*/
PLUS,
MINUS,
SLASH,
STAR,
EQUAL,
PLUSMINUS,
PERCENT,
CLEAR,
CLEARALL,
/* insert new buttons before this line */
MAX_BUTTONS
};
};
#endif
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