pika-welcome/src/main.rs

// GTK crates
use adw::prelude::*;
use adw::*;
use gdk::Display;
use glib::*;
/// Use all gtk4 libraries (gtk4 -> gtk because cargo)
/// Use all libadwaita libraries (libadwaita -> adw because cargo)
use gtk::prelude::*;
use gtk::*;

// application crates
mod build_ui;
use crate::build_ui::build_ui;
mod save_window_size;
use crate::save_window_size::save_window_size;
mod connection_check;
use crate::connection_check::check_internet_connection;
/// first setup crates
mod first_setup;

/// main function
fn main() {
    let application = adw::Application::new(
        Some("com.github.pikaos-linux.pikafirstsetup"),
        Default::default(),
    );
    application.connect_startup(|app| {
        // The CSS "magic" happens here.
        let provider = CssProvider::new();
        provider.load_from_string(include_str!("style.css"));
        // We give the CssProvided to the default screen so the CSS rules we added
        // can be applied to our window.
        gtk::style_context_add_provider_for_display(
            &Display::default().expect("Could not connect to a display."),
            &provider,
            STYLE_PROVIDER_PRIORITY_APPLICATION,
        );

        app.connect_activate(build_ui);
    });

    application.run();
}