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# -*- coding: utf-8 -*-
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# Class adapted from:
# http://stackoverflow.com/questions/3603502/
class Frozen(object):
__isfrozen = False
def __setattr__(self, key, value):
if self.__isfrozen and not hasattr(self, key):
raise AttributeError('%r is not an attribute of class %s. Call '
'"unfreeze()" to allow addition of new '
'attributes' % (key, self))
object.__setattr__(self, key, value)
def freeze(self):
"""Freeze the object so that only existing properties can be set"""
self.__isfrozen = True
def unfreeze(self):
"""Unfreeze the object so that additional properties can be added"""
self.__isfrozen = False
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