Home · All Classes · Main Classes · Grouped Classes · Modules · Functions

calculator.h Example File
widgets/calculator/calculator.h

 /****************************************************************************
 **
 ** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
 ** Licensees holding a valid Qt License Agreement may use this file in
 ** accordance with the rights, responsibilities and obligations
 ** contained therein.  Please consult your licensing agreement or
 ** contact sales@trolltech.com if any conditions of this licensing
 ** agreement are not clear to you.
 **
 ** Further information about Qt licensing is available at:
 ** http://www.trolltech.com/products/qt/licensing.html or by
 ** contacting info@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);

 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];
 };

 #endif


Copyright © 2008 Trolltech Trademarks
Qt 4.3.5