feat: add Phase 1 interaction protocols

compositor/src/handlers/activation.rs

@@ -0,0 +1,59 @@
+use std::time::Duration;
+
+use smithay::{
+    reexports::wayland_server::protocol::wl_surface::WlSurface,
+    utils::SERIAL_COUNTER,
+    wayland::xdg_activation::{
+        XdgActivationHandler, XdgActivationState, XdgActivationToken, XdgActivationTokenData,
+    },
+};
+
+use crate::Ferese;
+
+const TOKEN_MAX_AGE: Duration = Duration::from_secs(10);
+
+impl XdgActivationHandler for Ferese {
+    fn activation_state(&mut self) -> &mut XdgActivationState {
+        &mut self.xdg_activation_state
+    }
+
+    fn token_created(&mut self, _token: XdgActivationToken, data: XdgActivationTokenData) -> bool {
+        data.serial.is_some() && data.timestamp.elapsed() <= TOKEN_MAX_AGE
+    }
+
+    fn request_activation(
+        &mut self,
+        token: XdgActivationToken,
+        data: XdgActivationTokenData,
+        surface: WlSurface,
+    ) {
+        let valid = data.serial.is_some() && data.timestamp.elapsed() <= TOKEN_MAX_AGE;
+        self.xdg_activation_state.remove_token(&token);
+        if !valid {
+            tracing::debug!("ignored stale or non-interactive activation request");
+            return;
+        }
+
+        let Some(window) = self
+            .space
+            .elements()
+            .find(|window| {
+                window
+                    .toplevel()
+                    .is_some_and(|toplevel| toplevel.wl_surface() == &surface)
+            })
+            .cloned()
+        else {
+            return;
+        };
+
+        self.space.raise_element(&window, true);
+        let keyboard = self.seat.get_keyboard().expect("seat has a keyboard");
+        keyboard.set_focus(self, Some(surface), SERIAL_COUNTER.next_serial());
+        self.space.elements().for_each(|window| {
+            if let Some(toplevel) = window.toplevel() {
+                toplevel.send_pending_configure();
+            }
+        });
+    }
+}