wl_registry_add_listener example (Rust)

Cargo.toml

[package]
name = "globals"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
log = "0.4.21"
simple_logger = "4.3.3"
wayland-client = "0.31.2"

main.rs

use simple_logger::SimpleLogger;
use wayland_client::{protocol::wl_registry, Connection, Dispatch, QueueHandle};

struct AppData;
impl Dispatch<wl_registry::WlRegistry, ()> for AppData {
    fn event(
        _state: &mut Self,
        _: &wl_registry::WlRegistry,
        event: wl_registry::Event,
        _: &(),
        _: &Connection,
        _: &QueueHandle<AppData>,
    ) {
        // When receiving events from the wl_registry, we are only interested in the
        // `global` event, which signals a new available global.
        // When receiving this event, we just print its characteristics in this example.
        if let wl_registry::Event::Global { name, interface, version } = event {
            log::info!("[{}] {} (v{})", name, interface, version);
        } else if let wl_registry::Event::GlobalRemove { name } = event {
            log::info!("[{}] removed", name);
        }
    }
}

fn main() {
    SimpleLogger::new().init().unwrap();
    let conn = Connection::connect_to_env().unwrap();
    let display = conn.display();
    let mut event_queue = conn.new_event_queue();
    let qh = event_queue.handle();
    let _registry = display.get_registry(&qh, ());
    // event_queue.roundtrip(&mut AppData).unwrap();
    loop {
        event_queue.blocking_dispatch(&mut AppData).unwrap();
    }
}