config: add warp-mouse-to-focus action

src/ifs/wl_seat.rs

@@ -258,6 +258,7 @@ pub struct WlSeatGlobal {
     modifiers_forward: EventSource<dyn LedsListener>,
     simple_im: CloneCell<Option<Rc<SimpleIm>>>,
     simple_im_enabled: Cell<bool>,
+    warp_mouse_to_focus_scheduled: Cell<bool>,
 }
 
 impl PartialEq for WlSeatGlobal {
@@ -400,6 +401,7 @@ impl WlSeatGlobal {
             modifiers_forward: Default::default(),
             simple_im: CloneCell::new(simple_im),
             simple_im_enabled: Cell::new(true),
+            warp_mouse_to_focus_scheduled: Cell::new(false),
         });
         slf.pointer_cursor.set_owner(slf.clone());
         slf.modifiers_listener
@@ -820,6 +822,12 @@ impl WlSeatGlobal {
         }
     }
 
+    pub fn schedule_warp_mouse_to_focus(self: &Rc<Self>) {
+        if !self.warp_mouse_to_focus_scheduled.replace(true) {
+            self.state.pending_warp_mouse_to_focus.push(self.clone());
+        }
+    }
+
     pub fn move_focused(self: &Rc<Self>, direction: Direction) {
         let kb_node = self.keyboard_node.get();
         let Some(tl) = kb_node.node_toplevel() else {
@@ -2007,3 +2015,25 @@ pub async fn handle_position_hint_requests(state: Rc<State>) {
         req.seat.motion_event_abs(state.now_usec(), x, y);
     }
 }
+
+pub async fn handle_warp_mouse_to_focus(state: Rc<State>) {
+    loop {
+        state.pending_warp_mouse_to_focus.non_empty().await;
+        state.eng.yield_now().await;
+        while let Some(seat) = state.pending_warp_mouse_to_focus.try_pop() {
+            seat.warp_mouse_to_focus_scheduled.set(false);
+            let Some(tl) = seat.keyboard_node.get().node_toplevel() else {
+                continue;
+            };
+            let (x, y) = tl.node_absolute_position().center();
+            let Some(target) = state.node_at(x, y).node.node_toplevel() else {
+                continue;
+            };
+            if target.node_id() != tl.node_id() {
+                continue;
+            }
+            let (x, y) = (Fixed::from_int(x), Fixed::from_int(y));
+            seat.motion_event_abs(state.now_usec(), x, y);
+        }
+    }
+}