#------------------------------------------------------------------------------
# Copyright (c) 2013-2017, Nucleic Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#------------------------------------------------------------------------------
from .catom import Member, Validate, GetAttr, SetAttr, DelAttr
class Event(Member):
""" A member which acts like a stateless event.
"""
__slots__ = ()
def __init__(self, kind=None):
""" Initialize an Event.
Parameters
----------
kind : type or Member, optional
The type of argument which may be emitted by the event or
a Member which will validate the argument which can be
emitted. The default is None and indicates no validation
will be performed.
"""
self.set_getattr_mode(GetAttr.Event, None)
self.set_setattr_mode(SetAttr.Event, None)
self.set_delattr_mode(DelAttr.Event, None)
if kind is not None:
if isinstance(kind, Member):
self.set_validate_mode(Validate.Delegate, kind)
else:
self.set_validate_mode(Validate.Instance, kind)
def set_name(self, name):
""" A reimplemented parent class method.
This method ensures that the delegate name is also set, if a
delegate validator is being used.
"""
super(Event, self).set_name(name)
mode, kind = self.validate_mode
if isinstance(kind, Member):
kind.set_name(name)
def set_index(self, index):
""" A reimplemented parent class method.
This method ensures that the delegate index is also set, if a
delegate validator is being used.
"""
super(Event, self).set_index(index)
mode, kind = self.validate_mode
if isinstance(kind, Member):
kind.set_index(index)