108 lines
3.2 KiB
C++
108 lines
3.2 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef CALCULATOR_H
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#define CALCULATOR_H
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#include <QWidget>
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QT_BEGIN_NAMESPACE
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class QLineEdit;
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QT_END_NAMESPACE
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class Button;
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//! [0]
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class Calculator : public QWidget
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{
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Q_OBJECT
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public:
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Calculator(QWidget *parent = 0);
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private slots:
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void digitClicked();
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void unaryOperatorClicked();
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void additiveOperatorClicked();
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void multiplicativeOperatorClicked();
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void equalClicked();
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void pointClicked();
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void changeSignClicked();
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void backspaceClicked();
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void clear();
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void clearAll();
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void clearMemory();
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void readMemory();
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void setMemory();
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void addToMemory();
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//! [0]
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//! [1]
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private:
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//! [1] //! [2]
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Button *createButton(const QString &text, const char *member);
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void abortOperation();
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bool calculate(double rightOperand, const QString &pendingOperator);
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//! [2]
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//! [3]
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double sumInMemory;
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//! [3] //! [4]
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double sumSoFar;
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//! [4] //! [5]
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double factorSoFar;
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//! [5] //! [6]
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QString pendingAdditiveOperator;
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//! [6] //! [7]
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QString pendingMultiplicativeOperator;
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//! [7] //! [8]
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bool waitingForOperand;
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//! [8]
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//! [9]
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QLineEdit *display;
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//! [9] //! [10]
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enum { NumDigitButtons = 10 };
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Button *digitButtons[NumDigitButtons];
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};
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//! [10]
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#endif
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