milkyway/src/handlers/wlr_layer_shell.rs

use smithay::{
    desktop::{layer_map_for_output, LayerSurface},
    output::Output,
    utils::SERIAL_COUNTER,
    wayland::shell::wlr_layer::{KeyboardInteractivity, Layer, WlrLayerShellHandler},
};
use wayland_server::protocol::wl_output::WlOutput;

use crate::State;

impl WlrLayerShellHandler for State {
    fn shell_state(&mut self) -> &mut smithay::wayland::shell::wlr_layer::WlrLayerShellState {
        &mut self.wlr_layer_shell_state
    }

    fn new_layer_surface(
        &mut self,
        surface: smithay::wayland::shell::wlr_layer::LayerSurface,
        output: Option<WlOutput>,
        layer: smithay::wayland::shell::wlr_layer::Layer,
        namespace: String,
    ) {
        let output = output
            .as_ref()
            .and_then(Output::from_resource)
            .unwrap_or_else(|| self.space.outputs().next().unwrap().clone());
        let mut map = layer_map_for_output(&output);
        let layer_surface = LayerSurface::new(surface.clone(), namespace);
        map.map_layer(&layer_surface).unwrap();
        surface.send_configure();

        let state = layer_surface.cached_state();

        if layer_surface.can_receive_keyboard_focus() {
            let keyboard = self.seat.get_keyboard().unwrap();
            keyboard.set_focus(
                self,
                Some(surface.wl_surface().clone()),
                SERIAL_COUNTER.next_serial(),
            );
        }
    }

    fn layer_destroyed(&mut self, surface: smithay::wayland::shell::wlr_layer::LayerSurface) {
        if let Some((mut map, layer)) = self.space.outputs().find_map(|o| {
            let map = layer_map_for_output(o);
            let layer = map
                .layers()
                .find(|&layer| layer.layer_surface() == &surface)
                .cloned();
            layer.map(|layer| (map, layer))
        }) {
            map.unmap_layer(&layer);
        }
    }
}