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shell_event.py
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shell_event.py
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# Copyright (C) 2009 Mark Seaborn
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA.
class EventDistributor(object):
def __init__(self):
self._callbacks = []
def add(self, callback):
def remover():
self._callbacks.remove(callback)
self._callbacks.append(callback)
return remover
def send(self, *args):
for callback in self._callbacks[:]:
callback(*args)
class ObservableCell(object):
def __init__(self, value):
self._on_change = EventDistributor()
self.add_observer = self._on_change.add
self._value = value
def set(self, value):
self._value = value
self._on_change.send()
def get(self):
return self._value
class ObservableRedirector(object):
def __init__(self, obs):
self._on_change = EventDistributor()
self.add_observer = self._on_change.add
self._remove_old = lambda: None
self.set(obs)
def set(self, obs):
self._remove_old()
def on_change():
self._value = obs.get()
self._on_change.send()
on_change()
self._remove_old = obs.add_observer(on_change)
def get(self):
return self._value