How to style a GtkLabel with CSS?

Question

I\'m trying to use CSS to style a GtkLabel. I would like to change the color and font size of the label. Here is my C code:

#include 

int m         


        

Answer 1

Currently, CSS providers are not inherited to the children style contexts. So you need to add the CSS provider to the screen using gtk_style_context_add_provider_for_screen()

Try changing

gtk_style_context_add_provider(gtk_widget_get_style_context(window),
                               GTK_STYLE_PROVIDER(cssProvider),
                               GTK_STYLE_PROVIDER_PRIORITY_USER);

to

gtk_style_context_add_provider_for_screen(gdk_screen_get_default(),
                                          GTK_STYLE_PROVIDER(cssProvider),
                                          GTK_STYLE_PROVIDER_PRIORITY_USER);

I don't think gtk supports multiple screens these days, but gtk_widget_get_screen() could be used to replace gdk_screen_get_default().