canvas-controller/main.cpp

#include <QApplication>
#include <QQmlApplicationEngine>
#include <QCursor>
#include <QScreen>
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    QScreen *screen = QApplication::screens().at(0);

    if (screen->availableSize().height() > screen->availableSize().width())
        QGuiApplication::setOverrideCursor(QCursor(Qt::BlankCursor));

    return app.exec();
}