2-2-5把书上的代码调通了
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iridiumR
parent
74e693590a
commit
e8fa6e2d7b
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QT += core gui
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greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
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CONFIG += c++17
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# You can make your code fail to compile if it uses deprecated APIs.
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# In order to do so, uncomment the following line.
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#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
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SOURCES += \
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main.cpp \
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mainwindow.cpp
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HEADERS += \
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mainwindow.h
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FORMS += \
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mainwindow.ui
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# Default rules for deployment.
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qnx: target.path = /tmp/$${TARGET}/bin
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else: unix:!android: target.path = /opt/$${TARGET}/bin
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!isEmpty(target.path): INSTALLS += target
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#include "mainwindow.h"
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#include <QApplication>
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int main(int argc, char *argv[])
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{
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QApplication a(argc, argv);
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MainWindow w;
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w.show();
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return a.exec();
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}
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#include "mainwindow.h"
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#include "ui_mainwindow.h"
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#include <QMessageBox>
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static std::string displayTest;
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MainWindow::MainWindow(QWidget *parent)
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: QMainWindow(parent)
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, ui(new Ui::MainWindow)
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{
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ui->setupUi(this);
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ui->lineEdit->setText("0");
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result=0.0;
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waitForOperand=true;
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connectSlots();
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}
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MainWindow::~MainWindow()
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{
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delete ui;
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}
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//计算
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bool MainWindow::calculate(double operand, QString pendingOperator)
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{
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if(pendingOperator == "+")
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{
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result += operand;
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}
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else if(pendingOperator == "-")
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{
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result -= operand;
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}
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else if(pendingOperator == "*")
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{
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result *= operand;
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}
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else if(pendingOperator == "/")
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{
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if(operand == 0.0)
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return false;
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result /= operand;
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}
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return true;
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}
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//错误处理
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void MainWindow::abortOperation()
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{
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result = 0.0;
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pendingOperator.clear();
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ui->lineEdit->setText("0");
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waitForOperand = true;
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QMessageBox::warning(this, "运算错误", "除数不能为零");
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}
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//似乎是数字被点击
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void MainWindow::digitClicked()
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{
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QPushButton *digitBtn = static_cast<QPushButton*>(sender());
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QString value = digitBtn->text();
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// if(ui->lineEdit->text() == "0" && value == "0")
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// return;
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if(waitForOperand)
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{
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ui->lineEdit->setText(value);
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waitForOperand = false;
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}
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else
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{
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ui->lineEdit->setText(ui->lineEdit->text() + value);
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}
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}
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void MainWindow::on_clearBtn_clicked()
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{
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//将当前显示的数归零
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ui->lineEdit->setText("0");
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waitForOperand = true;
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}
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void MainWindow::on_clearAllBtn_clicked()
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{
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//将当前显示的数据归零，并将之前保存的数据运算清除
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ui->lineEdit->setText("0");
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waitForOperand = true;
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result = 0.0;
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pendingOperator.clear();
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}
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void MainWindow::on_equalBtn_clicked()
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{
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double operand = ui->lineEdit->text().toDouble();
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if(pendingOperator.isEmpty())
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return;
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if(!calculate(operand, pendingOperator))
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{
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abortOperation();
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return;
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}
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ui->lineEdit->setText(QString::number(result));
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pendingOperator.clear();
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result = 0.0;
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waitForOperand = true;
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}
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void MainWindow::on_signBtn_clicked()
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{
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QString text = ui->lineEdit->text();
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double value = text.toDouble();
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if(value > 0)
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{
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text.prepend('-');
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}
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else if(value < 0)
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{
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text.remove(0, 1);
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}
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ui->lineEdit->setText(text);
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}
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void MainWindow::operatorClicked()
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{
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QPushButton *clickedBtn = qobject_cast<QPushButton *>(sender());
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QString clickedOperator = clickedBtn->text();
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double operand = ui->lineEdit->text().toDouble();
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if(!pendingOperator.isEmpty())
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{
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if(!calculate(operand, pendingOperator))
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{
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abortOperation();
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return;
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}
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ui->lineEdit->setText(QString::number(result));
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}
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else
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{
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result = operand;
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}
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pendingOperator = clickedOperator;
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waitForOperand = true;
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}
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void MainWindow::on_pointBtn_clicked()
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{
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if (waitForOperand)
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ui->lineEdit->setText("0");
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if (!ui->lineEdit->text().contains('.'))
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ui->lineEdit->setText(ui->lineEdit->text() + ".");
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waitForOperand = false;
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}
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void MainWindow::connectSlots()
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{
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QPushButton *digitBtns[10] = {
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ui->digitBtn0, ui->digitBtn1, ui->digitBtn2, ui->digitBtn3,
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ui->digitBtn4, ui->digitBtn5, ui->digitBtn6, ui->digitBtn7,
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ui->digitBtn8, ui->digitBtn9
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};
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for (auto btn : digitBtns)
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connect(btn, &QPushButton::clicked, this, &MainWindow::digitClicked);
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QPushButton *operatorBtns[4] = {
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ui->addBtn, ui->subtractionBtn, ui->mulBtn, ui->divisionBtn,
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};
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for (auto btn : operatorBtns)
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connect(btn, &QPushButton::clicked, this, &MainWindow::operatorClicked);
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}
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#ifndef MAINWINDOW_H
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#define MAINWINDOW_H
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#include <QMainWindow>
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QT_BEGIN_NAMESPACE
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namespace Ui { class MainWindow; }
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QT_END_NAMESPACE
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class MainWindow : public QMainWindow
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{
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Q_OBJECT
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public:
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MainWindow(QWidget *parent = nullptr);
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~MainWindow();
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private:
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Ui::MainWindow *ui;
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bool calculate(double operand, QString pendingOperator);
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//终止运算，清除数据，报错
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void abortOperation();
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//连接信号和槽
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void connectSlots();
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//储存运算符
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QString pendingOperator;
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//储存运算结果
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double result;
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//标记是否等待一个操作数
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bool waitForOperand;
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private slots:
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void on_clearBtn_clicked();
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void on_clearAllBtn_clicked();
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void on_equalBtn_clicked();
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void digitClicked();
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void on_signBtn_clicked();
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void operatorClicked();
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void on_pointBtn_clicked();
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};
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#endif // MAINWINDOW_H
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<?xml version="1.0" encoding="UTF-8"?>
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<ui version="4.0">
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<class>MainWindow</class>
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<widget class="QMainWindow" name="MainWindow">
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<property name="geometry">
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<rect>
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<x>0</x>
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<y>0</y>
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<width>405</width>
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<height>320</height>
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</rect>
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</property>
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<property name="windowTitle">
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<string>Calculator_v2_4490</string>
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</property>
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<widget class="QWidget" name="centralwidget">
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<layout class="QGridLayout" name="gridLayout">
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<item row="3" column="1">
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<widget class="QPushButton" name="digitBtn5">
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<property name="text">
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<string>5</string>
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</property>
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</widget>
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</item>
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<item row="5" column="3">
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<widget class="QPushButton" name="divisionBtn">
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<property name="text">
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<string>/</string>
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</property>
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</widget>
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</item>
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<item row="2" column="2">
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<widget class="QPushButton" name="digitBtn3">
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<property name="text">
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<string>3</string>
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</property>
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</widget>
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</item>
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<item row="3" column="0">
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<widget class="QPushButton" name="digitBtn4">
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<property name="text">
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<string>4</string>
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</property>
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</widget>
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</item>
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<item row="4" column="3">
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<widget class="QPushButton" name="mulBtn">
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<property name="text">
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<string>*</string>
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</property>
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</widget>
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</item>
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<item row="2" column="1">
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<widget class="QPushButton" name="digitBtn2">
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<property name="text">
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<string>2</string>
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</property>
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</widget>
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</item>
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<item row="1" column="0">
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<widget class="QPushButton" name="clearBtn">
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<property name="text">
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<string>Clear</string>
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</property>
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</widget>
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</item>
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<item row="1" column="1">
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<widget class="QPushButton" name="clearAllBtn">
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<property name="text">
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<string>ClearAll</string>
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</property>
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</widget>
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</item>
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<item row="5" column="0">
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<widget class="QPushButton" name="pointBtn">
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<property name="text">
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<string>.</string>
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</property>
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</widget>
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</item>
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<item row="5" column="1">
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<widget class="QPushButton" name="digitBtn0">
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<property name="text">
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<string>0</string>
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</property>
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</widget>
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</item>
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<item row="1" column="2" colspan="2">
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<widget class="QPushButton" name="equalBtn">
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<property name="text">
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<string>=</string>
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</property>
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</widget>
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</item>
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<item row="2" column="0">
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<widget class="QPushButton" name="digitBtn1">
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<property name="text">
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<string>1</string>
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</property>
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</widget>
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</item>
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<item row="3" column="2">
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<widget class="QPushButton" name="digitBtn6">
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<property name="text">
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<string>6</string>
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</property>
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</widget>
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</item>
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<item row="3" column="3">
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<widget class="QPushButton" name="subtractionBtn">
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<property name="text">
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<string>-</string>
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</property>
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</widget>
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</item>
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<item row="4" column="0">
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<widget class="QPushButton" name="digitBtn7">
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<property name="text">
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<string>7</string>
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</property>
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</widget>
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</item>
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<item row="0" column="0" colspan="4">
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<widget class="QLineEdit" name="lineEdit">
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<property name="alignment">
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<set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
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</property>
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<property name="readOnly">
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<bool>true</bool>
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</property>
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</widget>
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</item>
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<item row="4" column="1">
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<widget class="QPushButton" name="digitBtn8">
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<property name="text">
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<string>8</string>
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</property>
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</widget>
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</item>
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<item row="4" column="2">
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<widget class="QPushButton" name="digitBtn9">
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<property name="text">
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<string>9</string>
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</property>
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</widget>
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</item>
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<item row="2" column="3">
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<widget class="QPushButton" name="addBtn">
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<property name="text">
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<string>+</string>
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</property>
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</widget>
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</item>
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<item row="5" column="2">
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<widget class="QPushButton" name="signBtn">
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<property name="text">
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<string>+/-</string>
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</property>
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</widget>
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</item>
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</layout>
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</widget>
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<widget class="QMenuBar" name="menubar">
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<property name="geometry">
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<rect>
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<x>0</x>
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<y>0</y>
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<width>405</width>
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<height>30</height>
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</rect>
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</property>
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</widget>
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<widget class="QStatusBar" name="statusbar"/>
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</widget>
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<resources/>
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<connections/>
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</ui>
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