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Diffstat (limited to 'examples/calculator/calculator.cpp')
| -rw-r--r-- | examples/calculator/calculator.cpp | 406 |
1 files changed, 406 insertions, 0 deletions
diff --git a/examples/calculator/calculator.cpp b/examples/calculator/calculator.cpp new file mode 100644 index 0000000..c02b560 --- /dev/null +++ b/examples/calculator/calculator.cpp @@ -0,0 +1,406 @@ +/****************************************************************************
+**
+** 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(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]
+
+//! [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 == 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 (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() + tr("."));
+ waitingForOperand = false;
+}
+//! [22]
+
+//! [24]
+void Calculator::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 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(tr("####"));
+}
+//! [36]
+
+//! [38]
+bool Calculator::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 (rightOperand == 0.0)
+ return false;
+ factorSoFar /= rightOperand;
+ }
+ return true;
+}
+//! [38]
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