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nheko/third_party/SingleApplication-3.3.2/examples/calculator/calculator.cpp

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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtWidgets>
#include <cmath>
#include "button.h"
#include "calculator.h"
//! [0]
Calculator::Calculator(QWidget *parent)
: QWidget(parent)
{
sumInMemory = 0.0;
sumSoFar = 0.0;
factorSoFar = 0.0;
waitingForOperand = true;
//! [0]
//! [1]
display = new QLineEdit("0");
//! [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(".", SLOT(pointClicked()));
Button *changeSignButton = createButton("\302\261", SLOT(changeSignClicked()));
Button *backspaceButton = createButton("Backspace", SLOT(backspaceClicked()));
Button *clearButton = createButton("Clear", SLOT(clear()));
Button *clearAllButton = createButton("Clear All", SLOT(clearAll()));
Button *clearMemoryButton = createButton("MC", SLOT(clearMemory()));
Button *readMemoryButton = createButton("MR", SLOT(readMemory()));
Button *setMemoryButton = createButton("MS", SLOT(setMemory()));
Button *addToMemoryButton = createButton("M+", SLOT(addToMemory()));
Button *divisionButton = createButton("\303\267", SLOT(multiplicativeOperatorClicked()));
Button *timesButton = createButton("\303\227", SLOT(multiplicativeOperatorClicked()));
Button *minusButton = createButton("-", SLOT(additiveOperatorClicked()));
Button *plusButton = createButton("+", SLOT(additiveOperatorClicked()));
Button *squareRootButton = createButton("Sqrt", SLOT(unaryOperatorClicked()));
Button *powerButton = createButton("x\302\262", SLOT(unaryOperatorClicked()));
Button *reciprocalButton = createButton("1/x", SLOT(unaryOperatorClicked()));
Button *equalButton = createButton("=", 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("Calculator");
}
//! [6]
//! [7]
void Calculator::digitClicked()
{
Button *clickedButton = qobject_cast<Button *>(sender());
int digitValue = clickedButton->text().toInt();
if (display->text() == "0" && digitValue == 0.0)
return;
if (waitingForOperand) {
display->clear();
waitingForOperand = false;
}
display->setText(display->text() + QString::number(digitValue));
}
//! [7]
//! [8]
void Calculator::unaryOperatorClicked()
//! [8] //! [9]
{
Button *clickedButton = qobject_cast<Button *>(sender());
QString clickedOperator = clickedButton->text();
double operand = display->text().toDouble();
double result = 0.0;
if (clickedOperator == "Sqrt") {
if (operand < 0.0) {
abortOperation();
return;
}
result = std::sqrt(operand);
} else if (clickedOperator == "x\302\262") {
result = std::pow(operand, 2.0);
} else if (clickedOperator == "1/x") {
if (operand == 0.0) {
abortOperation();
return;
}
result = 1.0 / operand;
}
display->setText(QString::number(result));
waitingForOperand = true;
}
//! [9]
//! [10]
void Calculator::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 Calculator::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 Calculator::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 Calculator::pointClicked()
{
if (waitingForOperand)
display->setText("0");
if (!display->text().contains('.'))
display->setText(display->text() + ".");
waitingForOperand = false;
}
//! [22]
//! [24]
void Calculator::changeSignClicked()
{
QString text = display->text();
double value = text.toDouble();
if (value > 0.0) {
text.prepend("-");
} else if (value < 0.0) {
text.remove(0, 1);
}
display->setText(text);
}
//! [24]
//! [26]
void Calculator::backspaceClicked()
{
if (waitingForOperand)
return;
QString text = display->text();
text.chop(1);
if (text.isEmpty()) {
text = "0";
waitingForOperand = true;
}
display->setText(text);
}
//! [26]
//! [28]
void Calculator::clear()
{
if (waitingForOperand)
return;
display->setText("0");
waitingForOperand = true;
}
//! [28]
//! [30]
void Calculator::clearAll()
{
sumSoFar = 0.0;
factorSoFar = 0.0;
pendingAdditiveOperator.clear();
pendingMultiplicativeOperator.clear();
display->setText("0");
waitingForOperand = true;
}
//! [30]
//! [32]
void Calculator::clearMemory()
{
sumInMemory = 0.0;
}
void Calculator::readMemory()
{
display->setText(QString::number(sumInMemory));
waitingForOperand = true;
}
void Calculator::setMemory()
{
equalClicked();
sumInMemory = display->text().toDouble();
}
void Calculator::addToMemory()
{
equalClicked();
sumInMemory += display->text().toDouble();
}
//! [32]
//! [34]
Button *Calculator::createButton(const QString &text, const char *member)
{
Button *button = new Button(text);
connect(button, SIGNAL(clicked()), this, member);
return button;
}
//! [34]
//! [36]
void Calculator::abortOperation()
{
clearAll();
display->setText("####");
}
//! [36]
//! [38]
bool Calculator::calculate(double rightOperand, const QString &pendingOperator)
{
if (pendingOperator == "+") {
sumSoFar += rightOperand;
} else if (pendingOperator == "-") {
sumSoFar -= rightOperand;
} else if (pendingOperator == "\303\227") {
factorSoFar *= rightOperand;
} else if (pendingOperator == "\303\267") {
if (rightOperand == 0.0)
return false;
factorSoFar /= rightOperand;
}
return true;
}
//! [38]
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