Gtk-rs multithreading with rust

gtkmultithreading.rs

#![windows_subsystem = "windows"]
use gtk::prelude::*;
use std::{thread, time::Duration};

fn main() {
    println!("Hello, world!");
    if gtk::init().is_err() {
        eprintln!("failed to initialize");
        return;
    }

    let glade_src = include_str!("gui.glade");
    let builder = gtk::Builder::from_string(glade_src);
    let button: gtk::Button = builder.get_object("cmd_clique").unwrap();
    let window: gtk::Window = builder.get_object("main_window").unwrap();
    let mut _progress: gtk::ProgressBar = builder.get_object("pb_progress").unwrap();

    window.connect_destroy(|_| {
        gtk::main_quit();
    });

    let (tx, rx) = glib::MainContext::channel(glib::PRIORITY_DEFAULT);

    button.connect_clicked(move |_| {
        let ntx = tx.clone();
        thread::spawn(move || {
            for i in 0..100 {
                thread::sleep(Duration::from_millis(100));
                ntx.send(i).expect("cant sent data");
            }
        });
    });

    let pb = _progress.clone();

    rx.attach(None, move |id| {
        let data = (id as f64) / 100.0;
        pb.set_fraction(data);
        glib::Continue(true)
    });

    window.show_all();
    gtk::main();
}