Re: Using CSS Data from Within My Code

[Ron Tarrant via Digitalmars-d-learn]

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());