GTK-rs set global CSS

gistfile1.rs

extern crate gtk;
use crate::gtk::prelude::*;
use gtk::*;

fn main() {
    if gtk::init().is_err() {
        println!("Failed to initialize GTK.");
        return;
    }

    let glade_src = include_str!("app.glade");

    let builder = gtk::Builder::from_string(glade_src);

    let window: gtk::Window = builder.get_object("window1").unwrap();
    let button: gtk::Button = builder.get_object("button1").unwrap();

    // set global style
    let screen = window.get_screen().unwrap();
    let style = include_str!("style.css");
    let provider = CssProvider::new();
    provider.load_from_data(style.as_bytes()).unwrap();
    gtk::StyleContext::add_provider_for_screen(&screen, &provider, STYLE_PROVIDER_PRIORITY_APPLICATION);

    button.connect_clicked(move |_| println!("foo"));

    window.show_all();

    gtk::main();
}

style.css

/* set styles that affect everythint */
* {
    color: red;
}