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