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'''
Task Coach - Your friendly task manager
Copyright (C) 2004-2014 Task Coach developers <developers@taskcoach.org>
Task Coach is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Task Coach is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
from taskcoachlib import patterns
import weakref
from taskcoachlib.thirdparty._weakrefset import WeakSet
class Attribute(object):
__slots__ = ('__value', '__owner', '__setEvent')
def __init__(self, value, owner, setEvent):
super(Attribute, self).__init__()
self.__value = value
self.__owner = weakref.ref(owner)
self.__setEvent = setEvent.im_func
def get(self):
return self.__value
@patterns.eventSource
def set(self, value, event=None):
owner = self.__owner()
if owner is not None:
if value == self.__value:
return False
self.__value = value
self.__setEvent(owner, event)
return True
class SetAttribute(object):
__slots__ = ('__set', '__owner', '__addEvent', '__removeEvent',
'__changeEvent', '__setClass')
def __init__(self, values, owner, addEvent=None, removeEvent=None, changeEvent=None, weak=False):
self.__setClass = WeakSet if weak else set
self.__set = self.__setClass(values) if values else self.__setClass()
self.__owner = weakref.ref(owner)
self.__addEvent = (addEvent or self.__nullEvent).im_func
self.__removeEvent = (removeEvent or self.__nullEvent).im_func
self.__changeEvent = (changeEvent or self.__nullEvent).im_func
def get(self):
return set(self.__set)
@patterns.eventSource
def set(self, values, event=None):
owner = self.__owner()
if owner is not None:
if values == set(self.__set):
return False
added = values - set(self.__set)
removed = set(self.__set) - values
self.__set = self.__setClass(values)
if added:
self.__addEvent(owner, event, *added) # pylint: disable=W0142
if removed:
self.__removeEvent(owner, event, *removed) # pylint: disable=W0142
if added or removed:
self.__changeEvent(owner, event, *set(self.__set))
return True
@patterns.eventSource
def add(self, values, event=None):
owner = self.__owner()
if owner is not None:
if values <= set(self.__set):
return False
self.__set = self.__setClass(set(self.__set) | values)
self.__addEvent(owner, event, *values) # pylint: disable=W0142
self.__changeEvent(owner, event, *set(self.__set))
return True
@patterns.eventSource
def remove(self, values, event=None):
owner = self.__owner()
if owner is not None:
if values & set(self.__set) == set():
return False
self.__set = self.__setClass(set(self.__set) - values)
self.__removeEvent(owner, event, *values) # pylint: disable=W0142
self.__changeEvent(owner, event, *set(self.__set))
return True
def __nullEvent(self, *args, **kwargs):
pass
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