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406 lines
12 KiB
406 lines
12 KiB
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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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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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** 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 The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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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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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtWidgets>
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#include <cmath>
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#include "button.h"
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#include "calculator.h"
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//! [0]
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Calculator::Calculator(QWidget *parent)
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: QWidget(parent)
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{
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sumInMemory = 0.0;
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sumSoFar = 0.0;
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factorSoFar = 0.0;
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waitingForOperand = true;
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//! [0]
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//! [1]
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display = new QLineEdit("0");
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//! [1] //! [2]
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display->setReadOnly(true);
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display->setAlignment(Qt::AlignRight);
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display->setMaxLength(15);
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QFont font = display->font();
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font.setPointSize(font.pointSize() + 8);
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display->setFont(font);
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//! [2]
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//! [4]
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for (int i = 0; i < NumDigitButtons; ++i) {
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digitButtons[i] = createButton(QString::number(i), SLOT(digitClicked()));
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}
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Button *pointButton = createButton(".", SLOT(pointClicked()));
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Button *changeSignButton = createButton("\302\261", SLOT(changeSignClicked()));
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Button *backspaceButton = createButton("Backspace", SLOT(backspaceClicked()));
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Button *clearButton = createButton("Clear", SLOT(clear()));
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Button *clearAllButton = createButton("Clear All", SLOT(clearAll()));
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Button *clearMemoryButton = createButton("MC", SLOT(clearMemory()));
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Button *readMemoryButton = createButton("MR", SLOT(readMemory()));
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Button *setMemoryButton = createButton("MS", SLOT(setMemory()));
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Button *addToMemoryButton = createButton("M+", SLOT(addToMemory()));
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Button *divisionButton = createButton("\303\267", SLOT(multiplicativeOperatorClicked()));
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Button *timesButton = createButton("\303\227", SLOT(multiplicativeOperatorClicked()));
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Button *minusButton = createButton("-", SLOT(additiveOperatorClicked()));
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Button *plusButton = createButton("+", SLOT(additiveOperatorClicked()));
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Button *squareRootButton = createButton("Sqrt", SLOT(unaryOperatorClicked()));
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Button *powerButton = createButton("x\302\262", SLOT(unaryOperatorClicked()));
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Button *reciprocalButton = createButton("1/x", SLOT(unaryOperatorClicked()));
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Button *equalButton = createButton("=", SLOT(equalClicked()));
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//! [4]
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//! [5]
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QGridLayout *mainLayout = new QGridLayout;
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//! [5] //! [6]
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mainLayout->setSizeConstraint(QLayout::SetFixedSize);
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mainLayout->addWidget(display, 0, 0, 1, 6);
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mainLayout->addWidget(backspaceButton, 1, 0, 1, 2);
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mainLayout->addWidget(clearButton, 1, 2, 1, 2);
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mainLayout->addWidget(clearAllButton, 1, 4, 1, 2);
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mainLayout->addWidget(clearMemoryButton, 2, 0);
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mainLayout->addWidget(readMemoryButton, 3, 0);
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mainLayout->addWidget(setMemoryButton, 4, 0);
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mainLayout->addWidget(addToMemoryButton, 5, 0);
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for (int i = 1; i < NumDigitButtons; ++i) {
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int row = ((9 - i) / 3) + 2;
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int column = ((i - 1) % 3) + 1;
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mainLayout->addWidget(digitButtons[i], row, column);
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}
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mainLayout->addWidget(digitButtons[0], 5, 1);
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mainLayout->addWidget(pointButton, 5, 2);
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mainLayout->addWidget(changeSignButton, 5, 3);
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mainLayout->addWidget(divisionButton, 2, 4);
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mainLayout->addWidget(timesButton, 3, 4);
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mainLayout->addWidget(minusButton, 4, 4);
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mainLayout->addWidget(plusButton, 5, 4);
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mainLayout->addWidget(squareRootButton, 2, 5);
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mainLayout->addWidget(powerButton, 3, 5);
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mainLayout->addWidget(reciprocalButton, 4, 5);
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mainLayout->addWidget(equalButton, 5, 5);
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setLayout(mainLayout);
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setWindowTitle("Calculator");
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}
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//! [6]
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//! [7]
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void Calculator::digitClicked()
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{
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Button *clickedButton = qobject_cast<Button *>(sender());
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int digitValue = clickedButton->text().toInt();
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if (display->text() == "0" && digitValue == 0.0)
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return;
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if (waitingForOperand) {
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display->clear();
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waitingForOperand = false;
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}
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display->setText(display->text() + QString::number(digitValue));
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}
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//! [7]
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//! [8]
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void Calculator::unaryOperatorClicked()
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//! [8] //! [9]
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{
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Button *clickedButton = qobject_cast<Button *>(sender());
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QString clickedOperator = clickedButton->text();
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double operand = display->text().toDouble();
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double result = 0.0;
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if (clickedOperator == "Sqrt") {
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if (operand < 0.0) {
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abortOperation();
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return;
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}
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result = std::sqrt(operand);
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} else if (clickedOperator == "x\302\262") {
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result = std::pow(operand, 2.0);
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} else if (clickedOperator == "1/x") {
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if (operand == 0.0) {
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abortOperation();
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return;
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}
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result = 1.0 / operand;
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}
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display->setText(QString::number(result));
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waitingForOperand = true;
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}
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//! [9]
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//! [10]
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void Calculator::additiveOperatorClicked()
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//! [10] //! [11]
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{
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Button *clickedButton = qobject_cast<Button *>(sender());
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QString clickedOperator = clickedButton->text();
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double operand = display->text().toDouble();
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//! [11] //! [12]
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if (!pendingMultiplicativeOperator.isEmpty()) {
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//! [12] //! [13]
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if (!calculate(operand, pendingMultiplicativeOperator)) {
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abortOperation();
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return;
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}
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display->setText(QString::number(factorSoFar));
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operand = factorSoFar;
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factorSoFar = 0.0;
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pendingMultiplicativeOperator.clear();
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}
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//! [13] //! [14]
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if (!pendingAdditiveOperator.isEmpty()) {
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//! [14] //! [15]
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if (!calculate(operand, pendingAdditiveOperator)) {
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abortOperation();
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return;
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}
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display->setText(QString::number(sumSoFar));
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} else {
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sumSoFar = operand;
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}
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//! [15] //! [16]
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pendingAdditiveOperator = clickedOperator;
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//! [16] //! [17]
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waitingForOperand = true;
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}
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//! [17]
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//! [18]
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void Calculator::multiplicativeOperatorClicked()
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{
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Button *clickedButton = qobject_cast<Button *>(sender());
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QString clickedOperator = clickedButton->text();
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double operand = display->text().toDouble();
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if (!pendingMultiplicativeOperator.isEmpty()) {
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if (!calculate(operand, pendingMultiplicativeOperator)) {
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abortOperation();
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return;
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}
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display->setText(QString::number(factorSoFar));
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} else {
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factorSoFar = operand;
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}
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pendingMultiplicativeOperator = clickedOperator;
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waitingForOperand = true;
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}
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//! [18]
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//! [20]
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void Calculator::equalClicked()
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{
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double operand = display->text().toDouble();
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if (!pendingMultiplicativeOperator.isEmpty()) {
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if (!calculate(operand, pendingMultiplicativeOperator)) {
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abortOperation();
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return;
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}
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operand = factorSoFar;
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factorSoFar = 0.0;
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pendingMultiplicativeOperator.clear();
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}
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if (!pendingAdditiveOperator.isEmpty()) {
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if (!calculate(operand, pendingAdditiveOperator)) {
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abortOperation();
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return;
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}
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pendingAdditiveOperator.clear();
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} else {
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sumSoFar = operand;
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}
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display->setText(QString::number(sumSoFar));
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sumSoFar = 0.0;
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waitingForOperand = true;
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}
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//! [20]
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//! [22]
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void Calculator::pointClicked()
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{
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if (waitingForOperand)
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display->setText("0");
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if (!display->text().contains('.'))
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display->setText(display->text() + ".");
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waitingForOperand = false;
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}
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//! [22]
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//! [24]
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void Calculator::changeSignClicked()
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{
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QString text = display->text();
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double value = text.toDouble();
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if (value > 0.0) {
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text.prepend("-");
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} else if (value < 0.0) {
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text.remove(0, 1);
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}
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display->setText(text);
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}
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//! [24]
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//! [26]
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void Calculator::backspaceClicked()
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{
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if (waitingForOperand)
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return;
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QString text = display->text();
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text.chop(1);
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if (text.isEmpty()) {
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text = "0";
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waitingForOperand = true;
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}
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display->setText(text);
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}
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//! [26]
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//! [28]
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void Calculator::clear()
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{
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if (waitingForOperand)
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return;
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display->setText("0");
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waitingForOperand = true;
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}
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//! [28]
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//! [30]
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void Calculator::clearAll()
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{
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sumSoFar = 0.0;
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factorSoFar = 0.0;
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pendingAdditiveOperator.clear();
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pendingMultiplicativeOperator.clear();
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display->setText("0");
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waitingForOperand = true;
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}
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//! [30]
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//! [32]
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void Calculator::clearMemory()
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{
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sumInMemory = 0.0;
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}
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void Calculator::readMemory()
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{
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display->setText(QString::number(sumInMemory));
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waitingForOperand = true;
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}
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void Calculator::setMemory()
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{
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equalClicked();
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sumInMemory = display->text().toDouble();
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}
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void Calculator::addToMemory()
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{
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equalClicked();
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sumInMemory += display->text().toDouble();
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}
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//! [32]
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//! [34]
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Button *Calculator::createButton(const QString &text, const char *member)
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{
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Button *button = new Button(text);
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connect(button, SIGNAL(clicked()), this, member);
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return button;
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}
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//! [34]
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//! [36]
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void Calculator::abortOperation()
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{
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clearAll();
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display->setText("####");
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}
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//! [36]
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//! [38]
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bool Calculator::calculate(double rightOperand, const QString &pendingOperator)
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{
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if (pendingOperator == "+") {
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sumSoFar += rightOperand;
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} else if (pendingOperator == "-") {
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sumSoFar -= rightOperand;
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} else if (pendingOperator == "\303\227") {
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factorSoFar *= rightOperand;
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} else if (pendingOperator == "\303\267") {
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if (rightOperand == 0.0)
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return false;
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factorSoFar /= rightOperand;
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}
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return true;
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}
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//! [38]
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