1 files changed, 36 insertions, 0 deletions
diff --git a/crates/wayland/src/protocols/xdg_activation.rs b/crates/wayland/src/protocols/xdg_activation.rs
new file mode 100644
index 0000000..846a213
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+++ b/crates/wayland/src/protocols/xdg_activation.rs
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+//! `xdg_activation_v1`: a launcher hands a spawned app a token, and the
+//! app's own first window presents it back to ask to be raised and focused.
+
+use smithay::reexports::wayland_server::protocol::wl_surface::WlSurface;
+use smithay::wayland::xdg_activation::{XdgActivationHandler, XdgActivationState, XdgActivationToken, XdgActivationTokenData};
+
+use crate::state::CompState;
+
+impl XdgActivationHandler for CompState {
+    fn activation_state(&mut self) -> &mut XdgActivationState {
+        &mut self.xdg_activation_state
+    }
+
+    /// A launcher spawns an app after first getting a token
+    /// (`get_activation_token`) and handing it to the new process (usually
+    /// via `XDG_ACTIVATION_TOKEN`); the app's own first window then
+    /// presents that same token back here via `activate`, asking to be
+    /// raised. Without this, that request was silently ignored - the new
+    /// window opened and just sat there unfocused behind everything,
+    /// exactly the gap `docs/PANEL_SUPPORT_TODO.md`'s P1 flagged.
+    ///
+    /// No token bookkeeping of our own: `token_created`'s default already
+    /// accepts every token (fine for a single-user session with no
+    /// cross-client trust boundary to enforce), so all that's left is
+    /// mapping the activating `surface` to a `WindowId` and reusing the
+    /// exact same `focus_window` path a dock's "activate" request already
+    /// goes through (`foreign_toplevel.rs`). If the surface isn't tracked
+    /// yet - the activation raced ahead of this window's own mapping --
+    /// there is nothing to focus yet, so this is a no-op rather than an
+    /// error; the protocol doesn't require honoring every activation.
+    fn request_activation(&mut self, _token: XdgActivationToken, _token_data: XdgActivationTokenData, surface: WlSurface) {
+        if let Some(&id) = self.surface_to_id.get(&surface) {
+            crate::input::focus_window(self, id);
+        }
+    }
+}