Using CSS Data from Within My Code

[Ron Tarrant]

On Thursday, 12 September 2019 at 11:35:04 UTC, Ron Tarrant wrote:
> On Thursday, 12 September 2019 at 10:09:06 UTC, Andrea Fontana 
> wrote:
>> On Thursday, 12 September 2019 at 09:54:35 UTC, Ron Tarrant 
>> wrote:
>>> I found this presented as a solution in a 2016 post:
>>>
>>> On Wednesday, 15 June 2016 at 22:05:37 UTC, captaindet wrote:
>>>
>>>> enum myCSS = q{
>>>>     GtkNotebook {
>>>>         background-color: #e9e9e9;
>>>>     }
>>>>     GtkNotebook tab {
>>>>         background-color: #d6d6d6;
>>>>     }
>>>> };
>>>
>>> But when I try to use it, I get the following errors:
>>>
>>> Warning: C preprocessor directive #e9e9e9 is not supported
>>> Warning: C preprocessor directive #d6d6d6 is not supported
>>>
>>> I thought it was odd having 'q' in front of the opening curly 
>>> brace... is this a typo? Shorthand for "string quote"? 
>>> Something like that?
>>>
>>> Or do I need to escape these somehow?
>>
>> They are named "token string" and contained code must be a 
>> valid d code. See https://dlang.org/spec/lex.html#token_strings
>
> Thanks, Andrea and Max.
>
> Turns out there's a simpler way to inject CSS into D code. In 
> case anyone else comes looking, I found that instead of an 
> enum, a string will do. Here's the solution I came up with to 
> make visible tabs in a Notebook:
>

That should have been:

class CSS // GTK4 compliant
{
	CssProvider provider;
	string myCSS = "tab { background-color: #f2f2f2; }";

	this(StyleContext styleContext)
	{
		provider = new CssProvider();
		provider.loadFromData(myCSS);
		styleContext.addProvider(provider, 
GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
		
	} // this()	
	
} // class CSS

The CSS path/file name isn't needed.