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This looks very promising but I cannot make it work. I have changed
product.py in DevHawk's example to:<br>
<br>
<pre>#from clrtypeold import ClrMetaclass
import clrtype
class Product(object):
#__metaclass__ = ClrMetaclass
__metaclass__ = clrtype.ClrClass
_clrnamespace = "DevHawk.IronPython.ClrTypeSeries"
#_clrproperties = {
#"name":str,
#"cost":float,
#"quantity":int,
#}
def __init__(self, name, cost, quantity):
self.name = name
self.cost = cost
self.quantity = quantity
def calc_total(self):
return self.cost * self.quantity
@property
@clrtype.accepts()
@clrtype.returns(str)
def name(self):
return self._name
@name.setter
@clrtype.accepts(str)
@clrtype.returns()
def name(self, value):
self._name = value
</pre>
When I run it I don't see any items in the listbox. When I check the
name, it is a property:<br>
<br>
<pre><span class="silverlightDlrReplPrompt">py></span> a.root.listbox1.Items[0]</pre>
<div class="silverlightDlrReplValue">
<pre>=> <Product object at 0x000000000000002B></pre>
</div>
<pre><span class="silverlightDlrReplPrompt">py> </span>a.root.listbox1.Items[0].GetType().GetProperties()</pre>
<div class="silverlightDlrReplValue">
<pre>=> Array[PropertyInfo]((<System.Reflection.RuntimePropertyInfo object at 0x000000000000002C [System.String name]>))</pre>
</div>
<pre>
</pre>
Whe I used the old clrtype with _clrproperties = {'name': str, ...}, it
worked.<br>
<br>
--<br>
-- Luká¹<br>
<br>
<br>
Shri Borde wrote:
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<div class="Section1">
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Here
is an updated version of clrtype.py that uses @property +
@clrtype.accepts/@clrtype.returns
to indicate a CLR property, instead of using “_clrproperties”. I think
its more Pythonic in general, but also you should be able to modify
@notify_property to work with it. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Note
that notify_property won’t just work. You will have
to change it to propagate the func_name, arg_types, and return_type
properties
from the old getter/setter function objects to the new getter/setter
function
objects since these values are used by clrtype to generate the CLR
members.
Something like this:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">class
notify_property(property):<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
<span
style="background: yellow none repeat scroll 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;">def
propagate_attributes(old_function, new_function):<o:p></o:p></span></span></p>
<p class="MsoNormal"><span
style="background: yellow none repeat scroll 0%; font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125); -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;">
new_function.func_name = old_function.func_name<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="background: yellow none repeat scroll 0%; font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125); -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;">
new_function.arg_types = old_function.arg_types<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="background: yellow none repeat scroll 0%; font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125); -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;">
new_function.return_type = old_function.return_type</span><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
def __init__(self, getter):<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
def newgetter(slf):<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
try:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
return getter(slf)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
except AttributeError:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
return None<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
<span
style="background: yellow none repeat scroll 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;">propagate_attributes(getter,
newgetter)</span><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
super(notify_property, self).__init__(newgetter)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
def setter(self, setter):<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
def newsetter(slf, newvalue):<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
oldvalue = self.fget(slf)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
if oldvalue != newvalue:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
setter(slf, newvalue)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
slf.OnPropertyChanged(setter.__name__)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
<span
style="background: yellow none repeat scroll 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;">propagate_attributes(setter,
newsetter)</span><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
return property(<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
fget=self.fget,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
fset=newsetter,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
fdel=self.fdel,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
doc=self.__doc__)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div>
<div
style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">
Lukas Cenovsky
[<a class="moz-txt-link-freetext" href="mailto:cenovsky@bakalari.cz">mailto:cenovsky@bakalari.cz</a>] <br>
<b>Sent:</b> Thursday, November 12, 2009 11:01 AM<br>
<b>To:</b> Shri Borde<br>
<b>Subject:</b> Re: [IronPython] .NET attributes for methods<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Shri Borde wrote: <o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">So
the new clrtype.py still works - cool!</span><o:p></o:p></p>
<p class="MsoNormal">Yep ;-)<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> I
am not an expert on data binding, so I don’t have
any suggestions. Why do you say that the decorator approach will not
work with
Silverlight? Does @notifiy_property from <a moz-do-not-send="true"
href="http://gui-at.blogspot.com/2009/11/inotifypropertychanged-in-ironpython.html">http://gui-at.blogspot.com/2009/11/inotifypropertychanged-in-ironpython.html</a>
use any feature not available in Silverlight?</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom: 12pt;">It does not (as far
as I know
because it is pure IronPython). But @notify_property does not work with
clrtypes:<o:p></o:p></p>
<pre>class ViewModel(NotifyPropertyChangedBase):<o:p></o:p></pre>
<pre> __metaclass__ = clrtype.ClrMetaclass<o:p></o:p></pre>
<pre> _clrnamespace = "Cenda.ViewModel"<o:p></o:p></pre>
<pre> _clrproperties = {'size': str}<o:p></o:p></pre>
<pre> <o:p></o:p></pre>
<pre> def __init__(self):<o:p></o:p></pre>
<pre> super(ViewModel, self).__init__()<o:p></o:p></pre>
<pre> # must be string to two-way binding work correctly<o:p></o:p></pre>
<pre> self.size = '10'<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre> @notify_property<o:p></o:p></pre>
<pre> def size(self):<o:p></o:p></pre>
<pre> return self._size<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre> @size.setter<o:p></o:p></pre>
<pre> def size(self, value):<o:p></o:p></pre>
<pre> self._size = value<o:p></o:p></pre>
<pre> print 'Size changed to %r' % self.size<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<p class="MsoNormal"><br>
When I run this code, the size is still clr property and Python getter
and
setter are not run.<br>
<br>
So basically I need to override/enhance clr getter and setter created
by
clrtype._clrproperties.<br>
<br>
--<br>
-- Luká¹<br>
<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> </span><o:p></o:p></p>
<div>
<div
style="border-style: solid none none; border-color: -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">
Lukas Cenovsky [<a moz-do-not-send="true"
href="mailto:cenovsky@bakalari.cz">mailto:cenovsky@bakalari.cz</a>] <br>
<b>Sent:</b> Thursday, November 12, 2009 8:09 AM<br>
<b>To:</b> Shri Borde<br>
<b>Subject:</b> Re: [IronPython] .NET attributes for methods</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks, that works!<br>
<br>
What do you think would be the best approach to create notifiable
properties for
Silverlight? I did it for WPF (via decorators: <a
moz-do-not-send="true"
href="http://gui-at.blogspot.com/2009/11/inotifypropertychanged-in-ironpython.html">http://gui-at.blogspot.com/2009/11/inotifypropertychanged-in-ironpython.html</a>)
but it seems to me it won't be possible to do it similarly for
Silverlight...<br>
<br>
--<br>
-- Luká¹<br>
<br>
Shri Borde wrote: <o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Can
you use “_clrproperties” instead of
“_clrfields”? DevHawk’s same created a field and a property
even when you just used “_clrfields”. I don’t do that
anymore. So you will need to use “_clrproperties” to get
properties, which SL must use for data binding.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> </span><o:p></o:p></p>
<div>
<div
style="border-style: solid none none; border-color: -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">
<a moz-do-not-send="true"
href="mailto:users-bounces@lists.ironpython.com">users-bounces@lists.ironpython.com</a>
[<a moz-do-not-send="true"
href="mailto:users-bounces@lists.ironpython.com">mailto:users-bounces@lists.ironpython.com</a>]
<b>On Behalf Of </b>Lukas Cenovsky<br>
<b>Sent:</b> Wednesday, November 11, 2009 2:37 AM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] .NET attributes for methods</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I did change __metaclass__ to ClrMetaclass. See
the attached
source I use for testing - the only difference is to comment/uncomment
appropriate part in product.py.<br>
<br>
The outputs look the same, there are no visible exceptions:<br>
<br>
DevHawk:<o:p></o:p></p>
<pre><span class="silverlightdlrreplprompt">py> </span>a.root.FindName('listbox1').ItemsSource[0].GetType().GetFields()<o:p></o:p></pre>
<div>
<pre>=> Array[FieldInfo]((<System.Reflection.RtFieldInfo object at 0x000000000000002B [Double cost]>,<o:p></o:p></pre>
<pre><System.Reflection.RtFieldInfo object at 0x000000000000002C [Int32 quantity]>,<o:p></o:p></pre>
<pre><System.Reflection.RtFieldInfo object at 0x000000000000002D [System.String name]>,<o:p></o:p></pre>
<pre><System.Reflection.RtFieldInfo object at 0x000000000000002E [IronPython.Runtime.Types.PythonType .class]>,<o:p></o:p></pre>
<pre><System.Reflection.RtFieldInfo object at 0x000000000000002F [IronPython.Runtime.PythonDictionary .dict]>,<o:p></o:p></pre>
<pre><System.Reflection.RtFieldInfo object at 0x0000000000000030 [System.Object[] .slots_and_weakref]>))<o:p></o:p></pre>
</div>
<p class="MsoNormal"><br>
Shri:<o:p></o:p></p>
<pre><span class="silverlightdlrreplprompt">py> </span>a.root.FindName('listbox1').ItemsSource[0].GetType().GetFields()<o:p></o:p></pre>
<div>
<pre>=> Array[FieldInfo]((<System.Reflection.RtFieldInfo object at 0x000000000000002B [Double cost]>,<o:p></o:p></pre>
<pre><System.Reflection.RtFieldInfo object at 0x000000000000002C [Int32 quantity]>,<o:p></o:p></pre>
<pre><System.Reflection.RtFieldInfo object at 0x000000000000002D [System.String name]>,<o:p></o:p></pre>
<pre><System.Reflection.RtFieldInfo object at 0x000000000000002E [IronPython.Runtime.Types.PythonType .class]>,<o:p></o:p></pre>
<pre><System.Reflection.RtFieldInfo object at 0x000000000000002F [IronPython.Runtime.PythonDictionary .dict]>,<o:p></o:p></pre>
<pre><System.Reflection.RtFieldInfo object at 0x0000000000000030 [System.Object[] .slots_and_weakref]>))<o:p></o:p></pre>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<p class="MsoNormal">--<br>
-- Luká¹<br>
<br>
<br>
Shri Borde wrote: <o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Note
that you will have to set __metaclass__ to ClrMetaclass,
not ClrTypeMetaclass as in DevHawk’s sample. I had changed the name of
the type. The old name will cause a NameError, but maybe SL is hiding
exceptions. Can you do “o.GetType().GetFields()” and display that
on the page to inspect the object and also make sure that no exceptions
were
thrown?</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"> </span><o:p></o:p></p>
<div>
<div
style="border-style: solid none none; border-color: -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">
<a moz-do-not-send="true"
href="mailto:users-bounces@lists.ironpython.com">users-bounces@lists.ironpython.com</a>
[<a moz-do-not-send="true"
href="mailto:users-bounces@lists.ironpython.com">mailto:users-bounces@lists.ironpython.com</a>]
<b>On Behalf Of </b>Lukas Cenovsky<br>
<b>Sent:</b> Tuesday, November 10, 2009 2:59 PM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] .NET attributes for methods</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I have just found that the Silverlight binding
does not work
with this version of clrtype and/or IronPython 2.6RC2.<br>
I used DevHawk demo [1] and after I added reference to
Microsoft.Dynamic in
clrtypemetaclass.py it worked flawlessly. But when I switch to your
version, no
items show in the listbox.<br>
<br>
By the way - I have seen a commit message you have added support for
interfaces
- nice! ;-)<br>
<br>
--<br>
-- Luká¹<br>
<br>
[1] <a moz-do-not-send="true"
href="http://cid-0d9bc809858885a4.skydrive.live.com/self.aspx/DevHawk%20Content/IronPython%20Stuff/%5E_%5E_clrtype%5E_%5E_/SL%20databinding%20demo.zip">http://cid-0d9bc809858885a4.skydrive.live.com/self.aspx/DevHawk%20Content/IronPython%20Stuff/^_^_clrtype^_^_/SL%20databinding%20demo.zip</a><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
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