/usr/share/doc/python-gtkmvc-doc/examples/observable/signal.py is in python-gtkmvc-doc 1.99.1-1build1.
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#
# Copyright (c) 2006 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., 51 Franklin Street, Fifth Floor,
# Boston, MA 02110, USA.
#
# For more information on pygtkmvc see <http://pygtkmvc.sourceforge.net>
# or email to the author Roberto Cavada <roboogle@gmail.com>.
# Please report bugs to <roboogle@gmail.com>.
# ----------------------------------------------------------------------
# In this example the use of observable properties is shown.
# Somethimes the models are interested in thriggering actions into
# observers when a certain event occurs, e.g. when the model changes
# status, but it is not important to hold the new status. In these
# situations, classical observable properties are not useful, and
# version 1.0.0 adds "signals" as special kind of observable
# properties. The example shows how signals can be used.
# ----------------------------------------------------------------------
import _importer
from gtkmvc.model import Model
from gtkmvc.observer import Observer
import gtkmvc.observable as observable
# ----------------------------------------------------------------------
class MyModel (Model):
sgn = observable.Signal()
__observables__ = ("sgn",)
pass
# ----------------------------------------------------------------------
class MyObserver (Observer):
def __init__(self, model):
Observer.__init__(self, model)
return
# notification
@Observer.observe("sgn", signal=True)
def signal_emit(self, model, prop_name, info):
print "Signal!", model, info.arg
return
pass # end of class
# Look at what happens to the observer
if __name__ == "__main__":
m = MyModel()
c = MyObserver(m)
m.sgn.emit() # we emit a signal
m.sgn.emit("hello!") # with arguments
pass
# ----------------------------------------------------------------------
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