Using CSS Data from Within My Code

[Ron Tarrant]

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:

class CSS // GTK4 compliant
{
	CssProvider provider;
	string cssPath = "./css/visible_tabs.css";

	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

And in the class that will use it, this line does it:

	css = new CSS(getStyleContext());