A discussion yesterday about XAML versus HTML degenerated into much debate around how terrible the XAML syntax is for declaring resources.

<Style TargetType="TextBlock" x:Key="TitleText">
  <Setter Property="Background" Value="Blue"/>
  <Setter Property="DockPanel.Dock" Value="Top"/>
  <Setter Property="FontSize" Value="18"/>
  <Setter Property="Foreground" Value="#4E87D4"/>
  <Setter Property="FontFamily" Value="Trebuchet MS"/>
  <Setter Property="Margin" Value="0,40,10,10"/>
</Style>

So very very verbose.

Contrast that with the equivalent CSS:

titletext 
{ 
   background: blue;
   font-size: 18;
   foreground: #4E87D4;
   font-family: Trebuchet MS;
   margin: 40px 10px 10px 0; // note how the order is different
}

So one wise-guy, who shall remain nameless, said "Why can't you just use CSS?" and after more debate I ran out of things that were dealbreakers.

So this little sandbox is an experiment - using Twitter Bootstrap as a reference stylesheet - to allow you to use CSS in your XAML apps.

I think the best approach for this is to use T4 templates, and I've got a prototype which now works using T4:

<#@ template language="C#" #>
<#@ output extension=".xaml" #>
<#@ assembly name="$(SolutionDir)\CloakedHipster\bin\Debug\CloakedHipster.dll" #>

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

<#
var conventions = new CloakedHipster.Conventions();
conventions.Use("btn", "Button");
conventions.Use("text", "TextBlock");

Write(CloakedHipster.Transformer.Generate(CssContents, conventions)); #>

</ResourceDictionary>

<#+
string CssContents = "titletext { background: blue; font-size: 18; foreground: #4E87D4; font-family: Trebuchet MS;   margin: 40px 10px 10px 0; }";
#>

And how would you use this?

1. Open a XAML app
2. File -> New Item -> Select "New CSS Resource" file -> Add
3. Paste in CSS contents into value. Save file.
4. Build process runs T4 engine and spits out a XAML resource file
5. Reference new resource dictionary in your App.xaml file

The use of conventions to resolve styles needs to be thought through - it feels rushed at the moment.

Integrating with the build system to provide feedback about how styles cannot be transformed

• "style 'titletext' could not be processed as it doesn't have a control defined..."
• "style 'titletext' has an image which is not included in the project..."

According to @tathamoddie, yes.