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Member "pysize-0.2/pysize/core/observable.py" (11 Mar 2007, 1283 Bytes) of package /linux/privat/old/pysize-0.2.tar.gz:

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    1 # This program is free software; you can redistribute it and/or modify
    2 # it under the terms of the GNU General Public License as published by
    3 # the Free Software Foundation; either version 2 of the License, or
    4 # (at your option) any later version.
    5 #
    6 # This program is distributed in the hope that it will be useful,
    7 # but WITHOUT ANY WARRANTY; without even the implied warranty of
    8 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    9 # GNU Library General Public License for more details.
   10 #
   11 # You should have received a copy of the GNU General Public License
   12 # along with this program; if not, write to the Free Software
   13 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
   14 #
   15 # See the COPYING file for license information.
   16 #
   17 # Copyright (c) 2006, 2007 Guillaume Chazarain <guichaz@yahoo.fr>
   18 
   19 class observable(object):
   20     """The Observer/Observable pattern"""
   21 
   22     def __init__(self):
   23         self.callbacks = []
   24 
   25     def add_observer(self, callback):
   26         self.callbacks.append(callback)
   27 
   28     def del_observer(self, callback):
   29         self.callbacks.remove(callback)
   30 
   31     def fire_observers(self, *args, **kwargs):
   32         # Copy in case the list is modified by an observer
   33         for cb in self.callbacks[:]:
   34             cb(*args, **kwargs)