void barcode::paintEvent(QPaintEvent *event)
{
    if (!plain_text_.isEmpty())
    {
        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing);
        barcode_impl_.setText(plain_text_);
        barcode_impl_.setHideText(true);
        barcode_impl_.setWidth(width());
        barcode_impl_.setHeight(height());
        barcode_impl_.setSymbol(BARCODE_CODE128);
        barcode_impl_.setScale(1.0);
        barcode_impl_.render(painter, rect(), Zint::QZint::AspectRatioMode::KeepAspectRatio);
        qDebug() << barcode_impl_.error_message();
    }
}