/**************************************************************************** ** ** Copyright (C) 2005-2007 Trolltech ASA. All rights reserved. ** ** This file is part of the example classes of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License version 2.0 as published by the Free Software Foundation ** and appearing in the file LICENSE.GPL included in the packaging of ** this file. Please review the following information to ensure GNU ** General Public Licensing requirements will be met: ** http://www.trolltech.com/products/qt/opensource.html ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://www.trolltech.com/products/qt/licensing.html or contact the ** sales department at sales@trolltech.com. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/ #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