From: [email protected] [mailto:users-
[email protected]] On Behalf Of Michael Foord
Sent: Monday, February 08, 2010 12:21 PM
To: Discussion of IronPython
Subject: [IronPython] Databinding a color in the datagrid in
Silverlight
Hello all,
We've been successfully using clrtype with IronPython 2.6 and
Silverlight for databinding, based on the example provided by Luk
áš:
http://gui-at.blogspot.com/2009/11/inotifypropertychanged-and-databinding.html
We create the binding when we create the datagrid columns
programatically.
Today I've been trying (and failing) to get a column in the grid
show different colors based on databinding.
I've got the colored bubble *showing* in the grid, but can't get
databinding to the color to work. First the basics.
This is the xaml for the bubble with a fixed color:
<DataTemplate xmlns='http://schemas.microsoft.com/client/2007'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'>
<Ellipse Stroke="#FF222222" Height="15" Width="15">
<Ellipse.Fill>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop x:Name="bubbleColor" Offset="0.694"
Color="#FF00FF40" />
<GradientStop Color="#FFE6E6E6"/>
</LinearGradientBrush>
</Ellipse.Fill>
</Ellipse>
</DataTemplate>
I can add a column based on this template very simply:
from com_modules.loadxaml import loadXaml
from System.Windows.Controls import DataGridTemplateColumn
column = DataGridTemplateColumn()
column.CellTemplate = loadXaml('templatecolumn')
column.Header = 'Bubble'
grid.Columns.Add(column)
If I try to naively specify a binding in the xaml then I get a
PARSER_BAD_PROPERTY_VALUE when I attempt to load the xaml (so no
hope of setting up the binding after load):
<GradientStop x:Name="bubbleColor" Offset="0.694"
Color="{Binding color}" />
One approach I tried was to create a ValueConverter. Here is the
skeleton of the class I created:
from System import Type
from System.Globalization import CultureInfo
from System.Windows.Data import IValueConverter
class ColorConverter(IValueConverter):
_clrnamespace = "Converters"
__metaclass__ = clrtype.ClrClass
@clrtype.accepts(object, Type, object, CultureInfo)
@clrtype.returns(object)
def Convert(self, value, targetType, parameter, culture):
pass
@clrtype.accepts(object, Type, object, CultureInfo)
@clrtype.returns(object)
def ConvertBack(self, value, targetType, parameter, culture):
pass
As there is a _clrnamespace specified I thought I might then be
able to use this converter in xaml. Trying to reference the
ColorConverter class in the Converters namespace in a resources
dictionary again causes blow ups when loading the xaml.
Setting this up programatically would be ideal. Anyone got any ideas?
All the best,
Michael
--
http://www.ironpythoninaction.com/
http://www.voidspace.org.uk/blog
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http://www.ironpythoninaction.com/
http://www.voidspace.org.uk/blog
READ CAREFULLY. By accepting and reading this email you agree, on
behalf of your employer, to release me from all obligations and
waivers arising from any and all NON-NEGOTIATED agreements,
licenses, terms-of-service, shrinkwrap, clickwrap, browsewrap,
confidentiality, non-disclosure, non-compete and acceptable use
policies (”BOGUS AGREEMENTS”) that I have entered into with your
employer, its partners, licensors, agents and assigns, in perpetui
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