We have several more or less independently working processors, without any own display, but these processors must be able to notify a display widget about a scan job. This class provides a "signal emitter", to which display widgets can connect. The signal name is "sane-jobinfo" We must also be aware of threading. Hence this class uses (obviously thread-safe) function gobject.idle_add to emit a signal, instead of emitting it directly.
Public Member Functions