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