Reusing a color

Hello.

I have a custom control that has a Color property.
In this control's style I want to use this color with different Alpha values.
And I want to do this using just XAML.

I've tried some tricks like setting a <Color> element in the Resources
section binding it to the control's Color.
Then, I tried to get each of the R, G and B values into a new <Color>
element in the Resources.
In this <Color> element I would change the Alpha value and get the color I
wanted, but it doesn't seem to work...

Anyway, it seems to complicated to my likings...

Any ideas? Thanks.

--
Duque Vieira

Color is a struct, not a DependencyObject, so its individual properties are
not DependencyProperties. As such, you cannot set their values to dynamic
resource references, databindings, etc. You can write a data converter
which will multi-bind to a color and an opacity and combine them to form a
new color - while this will be code, all of the usage will be in markup.
Alternately, many places where you can use a Color in WPF also allows you to
set the Opacity independently, such as SolidColorBrush.Color and
SolidColorBrush.Opacity. This is not universally available (e.g.
GradientStop doesn't have an Opacity property), but it's something to
consider depending on your scenario.

-Adam Smith [MS]

"Duque Vieira" <duquevieira@modellus.com> wrote in message
news:12E5B1A9-0A0F-4CEF-A765-49C5CE385A54@microsoft.com...
> Hello.
>
> I have a custom control that has a Color property.
> In this control's style I want to use this color with different Alpha
> values.
> And I want to do this using just XAML.
>
> I've tried some tricks like setting a <Color> element in the Resources
> section binding it to the control's Color.
> Then, I tried to get each of the R, G and B values into a new <Color>
> element in the Resources.
> In this <Color> element I would change the Alpha value and get the color I
> wanted, but it doesn't seem to work...
>
> Anyway, it seems to complicated to my likings...
>
> Any ideas? Thanks.
>
> --
> Duque Vieira