我想在按钮上调用另一个小部件应用程序计算器。直到这次我获得成功,但它在父小部件上重叠。
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QWidget>
class QLineEdit;
class QComboBox;
class calculator;
namespace Ui {
class MainWindow;
}
class MainWindow : public QWidget
{
Q_OBJECT
public:MainWindow();
public slots:
void calcButtonPressed();
private:
calculator *calc;
};
#endif // MAINWINDOW_H
和mainwindow.cpp
MainWindow::MainWindow(){
....
QPushButton *calcButton = new QPushButton(tr("Calc"));
connect(calcButton,SIGNAL(clicked(bool)),this,SLOT(calcButtonPressed()));
....
}
void MainWindow::calcButtonPressed(){
calc = new calculator(this);
calc->show();
}
calculator.cpp
#include<QtWidgets>
#include<cmath>
#include "button.h"
#include "calculator.h"
calculator::calculator(QWidget *parent): QWidget(parent)
{
sumInMemory=0.0;
sumSoFar=0.0;
factorSoFar=0.0;
waitingForOperand=true;
display=new QLineEdit("0");
display->setReadOnly(true);
display->setAlignment(Qt::AlignRight);
display->setMaxLength(15);
QFont font=display->font();
font.setPointSize(font.pointSize()+8);
display->setFont(font);
for (int i = 0; i < NumDigitButton; ++i) {
digitButton[i] = createButton(QString::number(i), SLOT(digitClicked()));
}
button *pointButton =createButton(tr("."),SLOT(pointClicked()));
button *changeSignButton=createButton(tr("\30\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()));
QGridLayout *mainLayout = new QGridLayout;
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 < NumDigitButton; ++i) {
int row = ((9 - i) / 3) + 2;
int column = ((i - 1) % 3) + 1;
mainLayout->addWidget(digitButton[i], row, column);
}
mainLayout->addWidget(digitButton[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"));
}
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));
}
void calculator::unaryOperatorClicked()
{
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;
}
void calculator::additiveOperatorClicked()
{
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));
operand = factorSoFar;
factorSoFar = 0.0;
pendingMultiplicativeOperator.clear();
}
if (!pendingAdditiveOperator.isEmpty()) {
if (!calculate(operand, pendingAdditiveOperator)) {
abortOperation();
return;
}
display->setText(QString::number(sumSoFar));
} else {
sumSoFar = operand;
}
pendingAdditiveOperator = clickedOperator;
waitingForOperand = true;
}
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;
}
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;
}
void calculator::pointClicked()
{
if (waitingForOperand)
display->setText("0");
if (!display->text().contains('.'))
display->setText(display->text() + tr("."));
waitingForOperand = false;
}
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);
}
void calculator::backspaceClicked()
{
if (waitingForOperand)
return;
QString text = display->text();
text.chop(1);
if (text.isEmpty()) {
text = "0";
waitingForOperand = true;
}
display->setText(text);
}
void calculator::clear()
{
display->setText("0");
waitingForOperand = true;
}
void calculator::clearAll()
{
sumSoFar = 0.0;
factorSoFar = 0.0;
pendingAdditiveOperator.clear();
pendingMultiplicativeOperator.clear();
display->setText("0");
waitingForOperand = true;
}
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();
}
button *calculator::createButton(const QString &text, const char *member)
{
button *button1 = new button(text);
connect(button1, SIGNAL(clicked()), this, member);
return button1;
}
void calculator::abortOperation()
{
clearAll();
display->setText(tr("####"));
}
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;
}
我得到输出,因为计算器重叠在主窗口小部件上。 我可以为计算器单独设置窗口吗?