mirror of
https://github.com/gryf/pygtktalog.git
synced 2025-12-17 19:40:21 +01:00
82 lines
3.1 KiB
Python
82 lines
3.1 KiB
Python
# Author: Roberto Cavada <cavada@irst.itc.it>
|
|
#
|
|
# Copyright (c) 2005 by Roberto Cavada
|
|
#
|
|
# pygtkmvc is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU Lesser General Public
|
|
# License as published by the Free Software Foundation; either
|
|
# version 2 of the License, or (at your option) any later version.
|
|
#
|
|
# pygtkmvc 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
|
|
# Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public
|
|
# License along with this library; if not, write to the Free Software
|
|
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
|
#
|
|
# For more information on pygtkmvc see <http://pygtkmvc.sourceforge.net>
|
|
# or email to the author Roberto Cavada <cavada@irst.itc.it>.
|
|
# Please report bugs to <cavada@irst.itc.it>.
|
|
|
|
from metaclass_base import PropertyMeta
|
|
import types
|
|
|
|
|
|
class ObservablePropertyMeta (PropertyMeta):
|
|
"""Classes instantiated by this meta-class must provide a method named
|
|
notify_property_change(self, prop_name, old, new)"""
|
|
def __init__(cls, name, bases, dict):
|
|
PropertyMeta.__init__(cls, name, bases, dict)
|
|
return
|
|
|
|
def get_setter_source(cls, setter_name, prop_name):
|
|
return """def %(setter)s(self, val):
|
|
old = self._prop_%(prop)s
|
|
new = type(self).create_value('%(prop)s', val, self)
|
|
self._prop_%(prop)s = new
|
|
if type(self).check_value_change(old, new): self._reset_property_notification('%(prop)s')
|
|
self.notify_property_value_change('%(prop)s', old, val)
|
|
return
|
|
""" % {'setter':setter_name, 'prop':prop_name}
|
|
|
|
pass #end of class
|
|
|
|
|
|
class ObservablePropertyMetaMT (ObservablePropertyMeta):
|
|
"""This class provides multithreading support for accesing
|
|
properties, through a locking mechanism. It is assumed a lock is
|
|
owned by the class that uses it. A Lock object called _prop_lock
|
|
is assumed to be a member of the using class. see for example class
|
|
ModelMT"""
|
|
def __init__(cls, name, bases, dict):
|
|
ObservablePropertyMeta.__init__(cls, name, bases, dict)
|
|
return
|
|
|
|
def get_setter_source(cls, setter_name, prop_name):
|
|
return """def %(setter)s(self, val):
|
|
old = self._prop_%(prop)s
|
|
new = type(self).create_value('%(prop)s', val, self)
|
|
self._prop_lock.acquire()
|
|
self._prop_%(prop)s = new
|
|
self._prop_lock.release()
|
|
if type(self).check_value_change(old, new): self._reset_property_notification('%(prop)s')
|
|
self.notify_property_value_change('%(prop)s', old, val)
|
|
return
|
|
""" % {'setter':setter_name, 'prop':prop_name}
|
|
|
|
pass #end of class
|
|
|
|
|
|
try:
|
|
from gobject import GObjectMeta
|
|
class ObservablePropertyGObjectMeta (ObservablePropertyMeta, GObjectMeta): pass
|
|
class ObservablePropertyGObjectMetaMT (ObservablePropertyMetaMT, GObjectMeta): pass
|
|
except:
|
|
class ObservablePropertyGObjectMeta (ObservablePropertyMeta): pass
|
|
class ObservablePropertyGObjectMetaMT (ObservablePropertyMetaMT): pass
|
|
pass
|
|
|
|
|