void DeclarativeDBusAdaptor::setBus(DeclarativeDBus::BusType bus)
{
    if (m_bus != bus) {
        m_bus = bus;
        emit busChanged();
    }
}
void DeclarativeDBusInterface::setBus(DeclarativeDBus::BusType bus)
{
    if (m_bus != bus) {
        disconnectSignalHandler();

        m_bus = bus;
        emit busChanged();

        connectSignalHandler();
    }
}