void MainWindow::on_actionEnter_Full_Screen_triggered()
{
#ifdef Q_OS_WIN
    bool isFull = isMaximized();
#else
    bool isFull = isFullScreen();
#endif
    if (isFull) {
        showNormal();
        ui->actionEnter_Full_Screen->setText(tr("Enter Full Screen"));
    } else {
#ifdef Q_OS_WIN
        showMaximized();
#else
        showFullScreen();
#endif
        ui->actionEnter_Full_Screen->setText(tr("Enter Full Screen"));
    }
}
void MainWindow::on_actionEnter_Full_Screen_triggered()
{
#ifdef Q_OS_WIN
    bool isFull = isMaximized();
#else
    bool isFull = isFullScreen();
#endif
    if (isFull) {
        showNormal();
        ui->actionEnter_Full_Screen->setText(tr("Enter Full Screen"));
    } else {
#ifdef Q_OS_WIN
        showMaximized();
#else
        showFullScreen();
#endif
        ui->actionEnter_Full_Screen->setText(tr("Enter Full Screen"));
    }
}