128 lines
3.1 KiB
C++
128 lines
3.1 KiB
C++
#include "mainwindow.h"
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#include "cal.h"
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#include "ui_mainwindow.h"
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#include <QMessageBox>
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static QString displayText;
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MainWindow::MainWindow(QWidget *parent)
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: QMainWindow(parent), ui(new Ui::MainWindow) {
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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() { delete ui; }
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//错误处理
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void MainWindow::abortOperation() {
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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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isFinished = false;
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QMessageBox::warning(this, "运算错误", "算式不合法");
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}
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//数字被点击
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void MainWindow::digitClicked() {
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QPushButton *digitBtn = static_cast<QPushButton *>(sender());
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// if(ui->lineEdit->text() == "0" && value == "0")
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// return;
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if (!isFinished) {
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displayText.append(digitBtn->text());
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ui->lineEdit->setText(displayText);
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} else {
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return;
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}
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}
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void MainWindow::on_clearBtn_clicked() {
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//将当前显示的数归零
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displayText.chop(1);
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ui->lineEdit->setText(displayText);
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isFinished = false;
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}
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void MainWindow::on_clearAllBtn_clicked() {
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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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displayText.clear();
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ui->lineEdit->setText(displayText);
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isFinished = false;
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result = 0.0;
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}
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void MainWindow::on_equalBtn_clicked() {
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try {
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result = cal(displayText.toStdString());
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}
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catch (...) {
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abortOperation();
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}
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isFinished = 1;
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ui->lineEdit->setText(QString::number(result));
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}
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//运算符
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void MainWindow::operatorClicked() {
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QPushButton *clickedBtn = qobject_cast<QPushButton *>(sender());
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if (!isFinished) {
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displayText.append(clickedBtn->text());
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ui->lineEdit->setText(displayText);
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} else {
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return;
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}
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}
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//槽链接
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void MainWindow::connectSlots() {
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QPushButton *digitBtns[10] = {ui->digitBtn0, ui->digitBtn1, ui->digitBtn2,
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ui->digitBtn3, ui->digitBtn4, ui->digitBtn5,
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ui->digitBtn6, ui->digitBtn7, ui->digitBtn8,
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ui->digitBtn9};
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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[6] = {ui->addBtn, ui->subtractionBtn,
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ui->mulBtn, ui->divisionBtn,
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ui->squareBtn, ui->pointBtn};
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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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void MainWindow::keyPressEvent(QKeyEvent *event) {
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switch (event->key()) {
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case Qt::Key_0:
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emit ui->digitBtn0->clicked();
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break;
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case Qt::Key_1:
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emit ui->digitBtn1->clicked();
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break;
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case Qt::Key_2:
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emit ui->digitBtn2->clicked();
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break;
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case Qt::Key_3:
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emit ui->digitBtn3->clicked();
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break;
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case Qt::Key_4:
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emit ui->digitBtn4->clicked();
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break;
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case Qt::Key_5:
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emit ui->digitBtn5->clicked();
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break;
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case Qt::Key_6:
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emit ui->digitBtn6->clicked();
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break;
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case Qt::Key_7:
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emit ui->digitBtn7->clicked();
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break;
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case Qt::Key_8:
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default:
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break;
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}
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}
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