qt-migration-copilot-demo/qt6-after/qt6-migrated-benchmark/MainWindow.cpp

#include "MainWindow.h"

#include "ui_MainWindow.h"

#include <QApplication>
#include <QPixmap>
#include <QScreen>
#include <QString>

MainWindow::MainWindow(QWidget* parent)
    : QMainWindow(parent), ui(new Ui::MainWindow), pattern(QRegularExpression(R"(^[A-Za-z]+\d+$)"))
{
    ui->setupUi(this);

    // Qt6 uses UTF-8 by default; no codec needed
    setWindowTitle(QString::fromUtf8("Qt6 Migrated Benchmark"));
    ui->label->setText(QString::fromUtf8("Bitte Text wie Test123 eingeben."));
    ui->iconLabel->setPixmap(QPixmap(":/icons/app.png").scaled(48, 48));

    // Modern function-pointer connect syntax
    connect(ui->validateButton, &QPushButton::clicked, this, &MainWindow::onValidateClicked);
    connect(ui->screenButton, &QPushButton::clicked, this, &MainWindow::onScreenInfoClicked);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::onValidateClicked()
{
    const QString text = ui->lineEdit->text();

    if (pattern.match(text).hasMatch())
    {
        ui->resultLabel->setText(QString::fromUtf8("Match"));
    }
    else
    {
        ui->resultLabel->setText(QString::fromUtf8("No match"));
    }
}

void MainWindow::onScreenInfoClicked()
{
    // Qt6: Use QScreen instead of deprecated QDesktopWidget
    const QScreen* screen = QApplication::primaryScreen();
    if (screen)
    {
        const QRect screenGeometry = screen->geometry();
        const QString info =
            QString::fromUtf8("Screen: %1x%2").arg(screenGeometry.width()).arg(screenGeometry.height());
        ui->resultLabel->setText(info);
    }
}