Unfocus window on X11 side when keyboard focus is lost

Closes #69 (nice)

src/server/event.rs

@@ -525,6 +525,24 @@ impl HandleEvent for Keyboard {
                     self.server.enter(serial, &data.server, keys);
                 }
             }
+            client::wl_keyboard::Event::Leave { serial, surface } => {
+                if !surface.is_alive() {
+                    return;
+                }
+                let key: ObjectKey = surface.data().copied().unwrap();
+                if let Some(data) = state
+                    .objects
+                    .get(key)
+                    .map(|o| <_ as AsRef<SurfaceData>>::as_ref(o))
+                {
+                    if state.to_focus == Some(data.window.unwrap()) {
+                        state.to_focus.take();
+                    } else {
+                        state.unfocus = true;
+                    }
+                    self.server.leave(serial, &data.server);
+                }
+            }
             _ => simple_event_shunt! {
                 self.server, event: client::wl_keyboard::Event => [
                     Keymap {
@@ -532,18 +550,6 @@ impl HandleEvent for Keyboard {
                         |fd| fd.as_fd(),
                         size
                     },
-                    Leave {
-                        serial,
-                        |surface| {
-                            if !surface.is_alive() {
-                                return;
-                            }
-                            let Some(surface_data) = state.get_server_surface_from_client(surface) else {
-                                return;
-                            };
-                            surface_data
-                        }
-                    },
                     Key {
                         serial,
                         time,

src/server/mod.rs

@@ -479,6 +479,7 @@ pub struct ServerState<C: XConnection> {
     qh: ClientQueueHandle,
     client: Option<Client>,
     to_focus: Option<x::Window>,
+    unfocus: bool,
     last_focused_toplevel: Option<x::Window>,
     last_hovered: Option<x::Window>,
     connection: Option<C>,
@@ -527,6 +528,7 @@ impl<C: XConnection> ServerState<C> {
             qh,
             dh,
             to_focus: None,
+            unfocus: false,
             last_focused_toplevel: None,
             last_hovered: None,
             connection: None,
@@ -832,7 +834,12 @@ impl<C: XConnection> ServerState<C> {
                 debug!("focusing window {win:?}");
                 conn.focus_window(win, data);
                 self.last_focused_toplevel = Some(win);
+            } else if self.unfocus {
+                let data = C::ExtraData::create(self);
+                let conn = self.connection.as_mut().unwrap();
+                conn.focus_window(x::WINDOW_NONE, data);
             }
+            self.unfocus = false;
         }
 
         self.handle_clipboard_events();

src/xstate/mod.rs

@@ -294,13 +294,6 @@ impl XState {
                 xcb::Event::X(x::Event::UnmapNotify(e)) => {
                     trace!("unmap event: {:?}", e.event());
                     server_state.unmap_window(e.window());
-                    unwrap_or_skip_bad_window_cont!(self.connection.send_and_check_request(
-                        &x::ChangeWindowAttributes {
-                            window: e.window(),
-                            value_list: &[x::Cw::EventMask(x::EventMask::empty())],
-                        }
-                    ));
-
                     let active_win = self
                         .connection
                         .wait_for_reply(self.get_property_cookie(
@@ -313,16 +306,19 @@ impl XState {
 
                     let active_win: &[x::Window] = active_win.value();
                     if active_win[0] == e.window() {
-                        self.connection
+                        <_ as super::XConnection>::focus_window(
-                            .send_and_check_request(&x::ChangeProperty {
+                            &mut self.connection,
-                                mode: x::PropMode::Replace,
+                            x::Window::none(),
-                                window: self.root,
+                            self.atoms.clone(),
-                                property: self.atoms.active_win,
+                        );
-                                r#type: x::ATOM_WINDOW,
-                                data: &[x::Window::none()],
-                            })
-                            .unwrap();
                     }
+
+                    unwrap_or_skip_bad_window_cont!(self.connection.send_and_check_request(
+                        &x::ChangeWindowAttributes {
+                            window: e.window(),
+                            value_list: &[x::Cw::EventMask(x::EventMask::empty())],
+                        }
+                    ));
                 }
                 xcb::Event::X(x::Event::DestroyNotify(e)) => {
                     debug!("destroying window {:?}", e.window());

tests/integration.rs

@@ -234,6 +234,7 @@ impl Fixture {
 xcb::atoms_struct! {
     struct Atoms {
         wm_protocols => b"WM_PROTOCOLS",
+        net_active_window => b"_NET_ACTIVE_WINDOW",
         wm_delete_window => b"WM_DELETE_WINDOW",
         clipboard => b"CLIPBOARD",
         targets => b"TARGETS",
@@ -489,22 +490,65 @@ fn input_focus() {
     let mut f = Fixture::new();
     let mut connection = Connection::new(&f.display);
 
-    let win = connection.new_window(connection.root, 0, 0, 20, 20, false);
+    let conn = std::cell::RefCell::new(&mut connection);
-    connection.map_window(win);
+    let check_focus = |win: x::Window| {
+        let connection = conn.borrow();
+        let focus = connection
+            .wait_for_reply(connection.send_request(&x::GetInputFocus {}))
+            .unwrap()
+            .focus();
+        assert_eq!(win, focus);
+
+        let reply = connection
+            .wait_for_reply(connection.send_request(&x::GetProperty {
+                delete: false,
+                window: connection.root,
+                property: connection.atoms.net_active_window,
+                r#type: x::ATOM_WINDOW,
+                long_offset: 0,
+                long_length: 1,
+            }))
+            .unwrap();
+
+        assert_eq!(&[win], reply.value::<x::Window>());
+    };
+
+    let mut create_win = || {
+        let mut connection = conn.borrow_mut();
+        let win = connection.new_window(connection.root, 0, 0, 20, 20, false);
+        connection.map_window(win);
+        f.wait_and_dispatch();
+        let surface = f
+            .testwl
+            .last_created_surface_id()
+            .expect("No surface created!");
+        f.configure_and_verify_new_toplevel(&mut connection, win, surface);
+        (win, surface)
+    };
+
+    let (win1, surface1) = create_win();
+    check_focus(win1);
+    let (win2, surface2) = create_win();
+    check_focus(win2);
+
+    f.testwl.focus_toplevel(surface1);
+    // Seems the event doesn't get caught by wait_and_dispatch...
+    std::thread::sleep(std::time::Duration::from_millis(10));
+    check_focus(win1);
+
+    f.testwl.unfocus_toplevel();
+    std::thread::sleep(std::time::Duration::from_millis(10));
+    check_focus(x::WINDOW_NONE);
+
+    f.testwl.focus_toplevel(surface2);
+    std::thread::sleep(std::time::Duration::from_millis(10));
+    check_focus(win2);
+
+    conn.borrow().destroy_window(win2);
     f.wait_and_dispatch();
-    let surface = f
+    check_focus(x::WINDOW_NONE);
-        .testwl
-        .last_created_surface_id()
-        .expect("No surface created!");
-    f.configure_and_verify_new_toplevel(&mut connection, win, surface);
 
-    let focus = connection
+    f.wm_delete_window(&mut connection, win1, surface1);
-        .wait_for_reply(connection.send_request(&x::GetInputFocus {}))
-        .unwrap()
-        .focus();
-    assert_eq!(win, focus);
-
-    f.wm_delete_window(&mut connection, win, surface);
 }
 
 #[test]