calculator.cpp

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#include <QtWidgets>
#include <QtGlobal>
 
#include <cmath>
 
#include "button.h"
#include "calculator.h"
 
//! [0]
CalculatorUtil::CalculatorUtil(QWidget *parent)
    : QWidget(parent)
    , sumInMemory(0.0)
    , sumSoFar(0.0)
    , factorSoFar(0.0)
    , pendingAdditiveOperator(QString())
    , pendingMultiplicativeOperator(QString())
    , waitingForOperand(true)
    , display(new QLineEdit("0"))
    , digitButtons()
{
//! [0]
//! [1]
//! [1] //! [2]
    display->setReadOnly(true);
    display->setAlignment(Qt::AlignRight);
    display->setMaxLength(15);
 
    QFont font = display->font();
    font.setPointSize(font.pointSize() + 8);
    display->setFont(font);
//! [2]
 
//! [4]
    for (int i = 0; i < NumDigitButtons; ++i) {
        digitButtons[i] = createButton(QString::number(i), SLOT(digitClicked()));
    }
 
    Button *pointButton = createButton(tr("."), SLOT(pointClicked()));
    Button *changeSignButton = createButton(tr("\302\261"), SLOT(changeSignClicked()));
 
    Button *backspaceButton = createButton(tr("Backspace"), SLOT(backspaceClicked()));
    Button *clearButton = createButton(tr("Clear"), SLOT(clear()));
    Button *clearAllButton = createButton(tr("Clear All"), SLOT(clearAll()));
 
    Button *clearMemoryButton = createButton(tr("MC"), SLOT(clearMemory()));
    Button *readMemoryButton = createButton(tr("MR"), SLOT(readMemory()));
    Button *setMemoryButton = createButton(tr("MS"), SLOT(setMemory()));
    Button *addToMemoryButton = createButton(tr("M+"), SLOT(addToMemory()));
 
    Button *divisionButton = createButton(tr("\303\267"), SLOT(multiplicativeOperatorClicked()));
    Button *timesButton = createButton(tr("\303\227"), SLOT(multiplicativeOperatorClicked()));
    Button *minusButton = createButton(tr("-"), SLOT(additiveOperatorClicked()));
    Button *plusButton = createButton(tr("+"), SLOT(additiveOperatorClicked()));
 
    Button *squareRootButton = createButton(tr("Sqrt"), SLOT(unaryOperatorClicked()));
    Button *powerButton = createButton(tr("x\302\262"), SLOT(unaryOperatorClicked()));
    Button *reciprocalButton = createButton(tr("1/x"), SLOT(unaryOperatorClicked()));
    Button *equalButton = createButton(tr("="), SLOT(equalClicked()));
//! [4]
 
//! [5]
    QGridLayout *mainLayout = new QGridLayout;
//! [5] //! [6]
    mainLayout->setSizeConstraint(QLayout::SetFixedSize);
    mainLayout->addWidget(display, 0, 0, 1, 6);
    mainLayout->addWidget(backspaceButton, 1, 0, 1, 2);
    mainLayout->addWidget(clearButton, 1, 2, 1, 2);
    mainLayout->addWidget(clearAllButton, 1, 4, 1, 2);
 
    mainLayout->addWidget(clearMemoryButton, 2, 0);
    mainLayout->addWidget(readMemoryButton, 3, 0);
    mainLayout->addWidget(setMemoryButton, 4, 0);
    mainLayout->addWidget(addToMemoryButton, 5, 0);
 
    for (int i = 1; i < NumDigitButtons; ++i) {
        int row = ((9 - i) / 3) + 2;
        int column = ((i - 1) % 3) + 1;
        mainLayout->addWidget(digitButtons[i], row, column);
    }
 
    mainLayout->addWidget(digitButtons[0], 5, 1);
    mainLayout->addWidget(pointButton, 5, 2);
    mainLayout->addWidget(changeSignButton, 5, 3);
 
    mainLayout->addWidget(divisionButton, 2, 4);
    mainLayout->addWidget(timesButton, 3, 4);
    mainLayout->addWidget(minusButton, 4, 4);
    mainLayout->addWidget(plusButton, 5, 4);
 
    mainLayout->addWidget(squareRootButton, 2, 5);
    mainLayout->addWidget(powerButton, 3, 5);
    mainLayout->addWidget(reciprocalButton, 4, 5);
    mainLayout->addWidget(equalButton, 5, 5);
    setLayout(mainLayout);
 
    setWindowTitle(tr("Calculator"));
}
//! [6]
//---------------------------------------------------------------------------------------------------------------------
CalculatorUtil::~CalculatorUtil()
{
}
 
//! [7]
void CalculatorUtil::digitClicked()
{
    Button *clickedButton = qobject_cast<Button *>(sender());
    int digitValue = clickedButton->text().toInt();
    if (display->text() == "0" && digitValue == 0 )
        return;
 
    if (waitingForOperand) {
        display->clear();
        waitingForOperand = false;
    }
    display->setText(display->text() + QString::number(digitValue));
}
//! [7]
 
//! [8]
void CalculatorUtil::unaryOperatorClicked()
//! [8] //! [9]
{
    Button *clickedButton = qobject_cast<Button *>(sender());
    QString clickedOperator = clickedButton->text();
    double operand = display->text().toDouble();
    double result = 0.0;
 
    if (clickedOperator == tr("Sqrt")) {
        if (operand < 0.0) {
            abortOperation();
            return;
        }
        result = std::sqrt(operand);
    } else if (clickedOperator == tr("x\302\262")) {
        result = std::pow(operand, 2.0);
    } else if (clickedOperator == tr("1/x")) {
        if (qFuzzyIsNull(operand))
        {
            abortOperation();
            return;
        }
        result = 1.0 / operand;
    }
    display->setText(QString::number(result));
    waitingForOperand = true;
}
//! [9]
 
//! [10]
void CalculatorUtil::additiveOperatorClicked()
//! [10] //! [11]
{
    Button *clickedButton = qobject_cast<Button *>(sender());
    QString clickedOperator = clickedButton->text();
    double operand = display->text().toDouble();
 
//! [11] //! [12]
    if (!pendingMultiplicativeOperator.isEmpty()) {
//! [12] //! [13]
        if (!calculate(operand, pendingMultiplicativeOperator)) {
            abortOperation();
            return;
        }
        display->setText(QString::number(factorSoFar));
        operand = factorSoFar;
        factorSoFar = 0.0;
        pendingMultiplicativeOperator.clear();
    }
 
//! [13] //! [14]
    if (!pendingAdditiveOperator.isEmpty()) {
//! [14] //! [15]
        if (!calculate(operand, pendingAdditiveOperator)) {
            abortOperation();
            return;
        }
        display->setText(QString::number(sumSoFar));
    } else {
        sumSoFar = operand;
    }
 
//! [15] //! [16]
    pendingAdditiveOperator = clickedOperator;
//! [16] //! [17]
    waitingForOperand = true;
}
//! [17]
 
//! [18]
void CalculatorUtil::multiplicativeOperatorClicked()
{
    Button *clickedButton = qobject_cast<Button *>(sender());
    QString clickedOperator = clickedButton->text();
    double operand = display->text().toDouble();
 
    if (!pendingMultiplicativeOperator.isEmpty()) {
        if (!calculate(operand, pendingMultiplicativeOperator)) {
            abortOperation();
            return;
        }
        display->setText(QString::number(factorSoFar));
    } else {
        factorSoFar = operand;
    }
 
    pendingMultiplicativeOperator = clickedOperator;
    waitingForOperand = true;
}
//! [18]
 
//! [20]
void CalculatorUtil::equalClicked()
{
    double operand = display->text().toDouble();
 
    if (!pendingMultiplicativeOperator.isEmpty()) {
        if (!calculate(operand, pendingMultiplicativeOperator)) {
            abortOperation();
            return;
        }
        operand = factorSoFar;
        factorSoFar = 0.0;
        pendingMultiplicativeOperator.clear();
    }
    if (!pendingAdditiveOperator.isEmpty()) {
        if (!calculate(operand, pendingAdditiveOperator)) {
            abortOperation();
            return;
        }
        pendingAdditiveOperator.clear();
    } else {
        sumSoFar = operand;
    }
 
    display->setText(QString::number(sumSoFar));
    sumSoFar = 0.0;
    waitingForOperand = true;
}
//! [20]
 
//! [22]
void CalculatorUtil::pointClicked()
{
    if (waitingForOperand)
        display->setText("0");
    if (!display->text().contains('.'))
        display->setText(display->text() + tr("."));
    waitingForOperand = false;
}
//! [22]
 
//! [24]
void CalculatorUtil::changeSignClicked()
{
    QString text = display->text();
    double value = text.toDouble();
 
    if (value > 0.0) {
        text.prepend(tr("-"));
    } else if (value < 0.0) {
        text.remove(0, 1);
    }
    display->setText(text);
}
//! [24]
 
//! [26]
void CalculatorUtil::backspaceClicked()
{
    if (waitingForOperand)
        return;
 
    QString text = display->text();
    text.chop(1);
    if (text.isEmpty()) {
        text = "0";
        waitingForOperand = true;
    }
    display->setText(text);
}
//! [26]
 
//! [28]
void CalculatorUtil::clear()
{
    if (waitingForOperand)
        return;
 
    display->setText("0");
    waitingForOperand = true;
}
//! [28]
 
//! [30]
void CalculatorUtil::clearAll()
{
    sumSoFar = 0.0;
    factorSoFar = 0.0;
    pendingAdditiveOperator.clear();
    pendingMultiplicativeOperator.clear();
    display->setText("0");
    waitingForOperand = true;
}
//! [30]
 
//! [32]
void CalculatorUtil::clearMemory()
{
    sumInMemory = 0.0;
}
 
void CalculatorUtil::readMemory()
{
    display->setText(QString::number(sumInMemory));
    waitingForOperand = true;
}
 
void CalculatorUtil::setMemory()
{
    equalClicked();
    sumInMemory = display->text().toDouble();
}
 
void CalculatorUtil::addToMemory()
{
    equalClicked();
    sumInMemory += display->text().toDouble();
}
//! [32]
//! [34]
Button *CalculatorUtil::createButton(const QString &text, const char *member)
{
    Button *button = new Button(text);
    connect(button, SIGNAL(clicked()), this, member);
    return button;
}
//! [34]
 
//! [36]
void CalculatorUtil::abortOperation()
{
    clearAll();
    display->setText(tr("####"));
}
//! [36]
 
//! [38]
bool CalculatorUtil::calculate(double rightOperand, const QString &pendingOperator)
{
    if (pendingOperator == tr("+")) {
        sumSoFar += rightOperand;
    } else if (pendingOperator == tr("-")) {
        sumSoFar -= rightOperand;
    } else if (pendingOperator == tr("\303\227")) {
        factorSoFar *= rightOperand;
    } else if (pendingOperator == tr("\303\267")) {
        if (qFuzzyIsNull(rightOperand))
            return false;
        factorSoFar /= rightOperand;
    }
    return true;
}
//! [38]