Viewing file:  proxy_signal.py (2.06 KB) -rw-r--r--
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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") + ">"
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