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Do not rely on __slots__ to define context manager methods. #217

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Merged
gottadiveintopython merged 1 commit into from
Feb 7, 2026
Merged

Do not rely on __slots__ to define context manager methods. #217

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21 changes: 15 additions & 6 deletions src/asynckivy/_etc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -179,12 +179,12 @@ async def rotate_widget(widget, *, angle=360.):
with sync_attr((widget, 'x'), (obj, 'xx')):
assert widget.x == obj.xx
'''
__slots__ = ("__exit__", )
__slots__ = ("_exit", )

def __init__(self, from_: tuple[EventDispatcher, str], to_: tuple[T.Any, str]):
setattr(*to_, getattr(*from_))
bind_uid = from_[0].fbind(from_[1], partial(self._sync, setattr, *to_))
self.__exit__ = partial(self._unbind, *from_, bind_uid)
self._exit = partial(self._unbind, *from_, bind_uid)

@staticmethod
def _sync(setattr, obj, attr_name, event_dispatcher, new_value):
Expand All @@ -197,6 +197,9 @@ def _unbind(event_dispatcher, event_name, bind_uid, *__):
def __enter__(self):
pass

def __exit__(self, *__):
self._exit()


class sync_attrs:
'''
Expand Down Expand Up @@ -248,13 +251,13 @@ async def scale_and_rotate_widget(widget, *, scale=2.0, angle=360.):
with sync_attrs((widget, 'x'), (obj, 'xx')):
assert widget.x is obj.xx
'''
__slots__ = ("__exit__", )
__slots__ = ("_exit", )

def __init__(self, from_: tuple[EventDispatcher, str], *to_):
sync = partial(self._sync, setattr, to_)
sync(None, getattr(*from_))
bind_uid = from_[0].fbind(from_[1], sync)
self.__exit__ = partial(self._unbind, *from_, bind_uid)
self._exit = partial(self._unbind, *from_, bind_uid)

@staticmethod
def _sync(setattr, to_, event_dispatcher, new_value):
Expand All @@ -266,6 +269,9 @@ def _sync(setattr, to_, event_dispatcher, new_value):
def __enter__(self):
pass

def __exit__(self, *__):
self._exit()


class smooth_attr:
'''
Expand Down Expand Up @@ -307,7 +313,7 @@ class smooth_attr:

.. versionadded:: 0.8.0
'''
__slots__ = ("__exit__", )
__slots__ = ("_exit", )
_NUMERIC_TYPES = (P.NumericProperty, P.BoundedNumericProperty, )
_SEQUENCE_TYPES = (P.ColorProperty, P.ReferenceListProperty, P.ListProperty, )

Expand All @@ -325,7 +331,7 @@ def __init__(self, target: tuple[EventDispatcher, str], follower: tuple[T.Any, s
partial(update, *target, *follower, -speed, -min_diff, min_diff), 0
)
bind_uid = target_obj.fbind(target_attr, trigger)
self.__exit__ = partial(self._cleanup, trigger, target_obj, target_attr, bind_uid)
self._exit = partial(self._cleanup, trigger, target_obj, target_attr, bind_uid)

@staticmethod
def _cleanup(trigger, target_obj, target_attr, bind_uid, *__):
Expand All @@ -335,6 +341,9 @@ def _cleanup(trigger, target_obj, target_attr, bind_uid, *__):
def __enter__(self):
pass

def __exit__(self, *__):
self._exit()

def _update_follower(getattr, setattr, math_exp, target_obj, target_attr, follower_obj, follower_attr,
negative_speed, min, max, dt):
t_value = getattr(target_obj, target_attr)
Expand Down