__setattr__ is not clean and easy readable piece of code. That's why I
dive into decorators and create a *notify_property*:
class notify_property(property):
def __init__(self, getter):
def newgetter(slf):
#return None when the property does not exist yet
try:
return getter(slf)
except AttributeError:
return None
super(notify_property, self).__init__(newgetter)
def setter(self, setter):
def newsetter(slf, newvalue):
# do not change value if the new value is the same
# trigger PropertyChanged event when value changes
oldvalue = self.fget(slf)
if oldvalue != newvalue:
setter(slf, newvalue)
slf.OnPropertyChanged(setter.__name__)
return property(
fget=self.fget,
fset=newsetter,
fdel=self.fdel,
doc=self.__doc__)
The usage is the same as for @property - see details on my blog:
http://gui-at.blogspot.com/2009/11/inotifypropertychanged-in-ironpython.html
Unfortunately, this does not work in Silverlight - probably because such
properties are not CLR fields. I'd like to find a way to make it work in
Silverlight too.
--
-- Lukáš
Curt Hagenlocher wrote:
Why don't you think that __setattr__ is a good approach? The
alternative (as shown in the linked Japanese-language blog) is to
implement setters for the properties you care about and to manually
trigger the event.
2009/11/6 Lukas Cenovsky <cenov...@bakalari.cz
<mailto:cenov...@bakalari.cz>>
Hi all,
I was looking for WPF data binding in IronPython and I have found
nice Japanese blog about it:
http://palepoli.skr.jp/wp/2009/06/28/wpf-listview-databinding-for-ironpython/
It links to
http://sdlsdk.codeplex.com/Thread/View.aspx?ThreadId=30322 that
should have more information about how to implement
INotifyPropertyChanged in IronPython which I am also interested
in. Unfortunately this page is no more available. Does the
guideline exist somewhere else? Thanks.
PS: I know about
http://lists.ironpython.com/pipermail/users-ironpython.com/2009-August/010938.html
but I don't think using __setattr__ is good approach. Also
implementing the PropertyChanged event is different on the blog.
--
-- Lukáš
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