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from .generic import bound_signal class ProxySignal(object): def __init__(self, iface_name, signal): self._iface_name = iface_name self.__name__ = signal.attrib["name"] self.__qualname__ = self._iface_name + "." + self.__name__ self._args = [arg.attrib["type"] for arg in signal if arg.tag == "arg"] self.__doc__ = "Signal. Callback: (" + ", ".join(self._args) + ")" def connect(self, object, callback): """Subscribe to the signal.""" def signal_fired(sender, object, iface, signal, params): callback(*params) return object._bus.subscribe(sender=object._bus_name, object=object._path, iface=self._iface_name, signal=self.__name__, signal_fired=signal_fired) def __get__(self, instance, owner): if instance is None: return self return bound_signal(self, instance) def __set__(self, instance, value): raise AttributeError("can't set attribute") def __repr__(self): return "<signal " + self.__qualname__ + " at 0x" + format(id(self), "x") + ">" class OnSignal(object): def __init__(self, signal): self.signal = signal self.__name__ = "on" + signal.__name__ self.__qualname__ = signal._iface_name + "." + self.__name__ self.__doc__ = "Assign a callback to subscribe to the signal. Assing None to unsubscribe. Callback: (" + ", ".join(signal._args) + ")" def __get__(self, instance, owner): if instance is None: return self try: return getattr(instance, "_on" + self.signal.__name__) except AttributeError: return None def __set__(self, instance, value): if instance is None: raise AttributeError("can't set attribute") try: old = getattr(instance, "_sub" + self.signal.__name__) old.unsubscribe() except AttributeError: pass if value is None: delattr(instance, "_on" + self.signal.__name__) delattr(instance, "_sub" + self.signal.__name__) return sub = self.signal.connect(instance, value) setattr(instance, "_on" + self.signal.__name__, value) setattr(instance, "_sub" + self.signal.__name__, sub) def __repr__(self): return "<descriptor " + self.__qualname__ + " at 0x" + format(id(self), "x") + ">"