implement zwlr_foreign_toplevel_management protocol (#452)

* implement zwlr_foreign_toplevel_management protocol

* check if initial id is empty

docs/features.md

@@ -193,6 +193,7 @@ Jay supports the following wayland protocols:
 | xdg_wm_base                                          | 7               |               |
 | xdg_wm_dialog_v1                                     | 1               |               |
 | zwlr_data_control_manager_v1                         | 2               | Yes           |
+| zwlr_foreign_toplevel_manager_v1                     | 3               | Yes           |
 | zwlr_layer_shell_v1                                  | 5               | No[^lsaccess] |
 | zwlr_screencopy_manager_v1                           | 3               | Yes           |
 | zwp_idle_inhibit_manager_v1                          | 1               |               |

release-notes.md

@@ -34,6 +34,7 @@
 - Jay now supports being started with CAP_SYS_NICE capabilities to improve
   responsiveness under high system load. This is described in detail in
   [setup.md](docs/setup.md).
+- Implement wlr-foreign-toplevel-management-v1.
 
 # 1.10.0 (2025-04-22)
 

src/client.rs

@@ -63,6 +63,7 @@ bitflags! {
         CAP_DRM_LEASE                = 1 << 9,
         CAP_INPUT_METHOD             = 1 << 10,
         CAP_WORKSPACE                = 1 << 11,
+        CAP_FOREIGN_TOPLEVEL_MANAGER = 1 << 12,
 }
 
 pub const CAPS_DEFAULT: ClientCaps = ClientCaps(CAP_LAYER_SHELL.0 | CAP_DRM_LEASE.0);

src/compositor.rs

@@ -333,6 +333,7 @@ fn start_compositor2(
         cl_matcher_manager: ClMatcherManager::new(&crit_ids),
         tl_matcher_manager: TlMatcherManager::new(&crit_ids),
         caps_thread,
+        toplevel_managers: Default::default(),
     });
     state.tracker.register(ClientId::from_raw(0));
     create_dummy_output(&state);

src/config/handler.rs

@@ -415,7 +415,7 @@ impl ConfigProxyHandler {
         fullscreen: bool,
     ) -> Result<(), CphError> {
         let tl = self.get_window(window)?;
-        tl.tl_set_fullscreen(fullscreen);
+        tl.tl_set_fullscreen(fullscreen, None);
         Ok(())
     }
 

src/globals.rs

@@ -58,6 +58,7 @@ use {
             xdg_toplevel_tag_manager_v1::XdgToplevelTagManagerV1Global,
             xdg_wm_base::XdgWmBaseGlobal,
             xdg_wm_dialog_v1::XdgWmDialogV1Global,
+            zwlr_foreign_toplevel_manager_v1::ZwlrForeignToplevelManagerV1Global,
             zwlr_layer_shell_v1::ZwlrLayerShellV1Global,
             zwlr_screencopy_manager_v1::ZwlrScreencopyManagerV1Global,
             zwp_idle_inhibit_manager_v1::ZwpIdleInhibitManagerV1Global,
@@ -202,6 +203,7 @@ impl Globals {
         add_singleton!(ZwpIdleInhibitManagerV1Global);
         add_singleton!(ExtIdleNotifierV1Global);
         add_singleton!(XdgToplevelDragManagerV1Global);
+        add_singleton!(ZwlrForeignToplevelManagerV1Global);
         add_singleton!(ZwlrDataControlManagerV1Global);
         add_singleton!(WpAlphaModifierV1Global);
         add_singleton!(ZwpVirtualKeyboardManagerV1Global);

src/ifs.rs

@@ -81,6 +81,8 @@ pub mod xdg_toplevel_drag_v1;
 pub mod xdg_toplevel_tag_manager_v1;
 pub mod xdg_wm_base;
 pub mod xdg_wm_dialog_v1;
+pub mod zwlr_foreign_toplevel_handle_v1;
+pub mod zwlr_foreign_toplevel_manager_v1;
 pub mod zwlr_layer_shell_v1;
 pub mod zwlr_screencopy_frame_v1;
 pub mod zwlr_screencopy_manager_v1;

src/ifs/wl_seat.rs

@@ -474,7 +474,7 @@ impl WlSeatGlobal {
 
     pub fn set_fullscreen(&self, fullscreen: bool) {
         if let Some(tl) = self.keyboard_node.get().node_toplevel() {
-            tl.tl_set_fullscreen(fullscreen);
+            tl.tl_set_fullscreen(fullscreen, None);
         }
     }
 

src/ifs/wl_surface/x_surface/xwindow.rs

@@ -302,7 +302,7 @@ impl Xwindow {
             Change::Map => {
                 self.data.state.map_tiled(self.clone());
                 if self.data.info.fullscreen.get() {
-                    self.clone().tl_set_fullscreen(true);
+                    self.clone().tl_set_fullscreen(true, None);
                 }
                 self.data.title_changed();
             }

src/ifs/wl_surface/xdg_surface/xdg_toplevel.rs

@@ -18,6 +18,7 @@ use {
                 },
             },
             xdg_toplevel_drag_v1::XdgToplevelDragV1,
+            zwlr_foreign_toplevel_manager_v1::ZwlrForeignToplevelManagerV1,
         },
         leaks::Tracker,
         object::{Object, Version},
@@ -180,6 +181,10 @@ impl XdgToplevel {
         self.toplevel_data.send(self.clone(), list);
     }
 
+    pub fn manager_send_to(self: &Rc<Self>, manager: &ZwlrForeignToplevelManagerV1) {
+        self.toplevel_data.manager_send(self.clone(), manager);
+    }
+
     pub fn send_current_configure(&self) {
         if self.drag.is_none() {
             let rect = self.xdg.absolute_desired_extents.get();

src/ifs/zwlr_foreign_toplevel_handle_v1.rs

@@ -0,0 +1,207 @@
+use {
+    crate::{
+        client::{Client, ClientError},
+        ifs::wl_output::WlOutput,
+        leaks::Tracker,
+        object::{Object, Version},
+        tree::{Direction, OutputNode, ToplevelOpt},
+        wire::{ZwlrForeignToplevelHandleV1Id, zwlr_foreign_toplevel_handle_v1::*},
+    },
+    arrayvec::ArrayVec,
+    std::rc::Rc,
+    thiserror::Error,
+};
+
+const STATE_ACTIVATED: u32 = 2;
+const STATE_FULLSCREEN: u32 = 3;
+
+const FULLSCREEN_SINCE: Version = Version(2);
+
+pub struct ZwlrForeignToplevelHandleV1 {
+    pub id: ZwlrForeignToplevelHandleV1Id,
+    pub client: Rc<Client>,
+    pub tracker: Tracker<Self>,
+    pub toplevel: ToplevelOpt,
+    pub version: Version,
+}
+
+impl ZwlrForeignToplevelHandleV1 {
+    fn detach(&self) {
+        if let Some(tl) = self.toplevel.get() {
+            tl.tl_data()
+                .manager_handles
+                .remove(&(self.client.id, self.id));
+        }
+    }
+}
+
+impl ZwlrForeignToplevelHandleV1RequestHandler for ZwlrForeignToplevelHandleV1 {
+    type Error = ZwlrForeignToplevelHandleV1Error;
+
+    fn destroy(&self, _req: Destroy, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        self.detach();
+        self.client.remove_obj(self)?;
+        Ok(())
+    }
+
+    fn set_maximized(&self, _req: SetMaximized, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        Ok(())
+    }
+
+    fn unset_maximized(&self, _req: UnsetMaximized, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        Ok(())
+    }
+
+    fn set_minimized(&self, _req: SetMinimized, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        Ok(())
+    }
+
+    fn unset_minimized(&self, _req: UnsetMinimized, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        Ok(())
+    }
+
+    fn activate(&self, req: Activate, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        if let Some(toplevel) = self.toplevel.get() {
+            if !toplevel.node_visible() {
+                return Ok(());
+            }
+            let seat = self.client.lookup(req.seat)?;
+            toplevel.node_do_focus(&seat.global, Direction::Unspecified);
+        }
+        Ok(())
+    }
+
+    fn close(&self, _req: Close, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        if let Some(toplevel) = self.toplevel.get() {
+            toplevel.tl_close();
+        }
+        Ok(())
+    }
+
+    fn set_rectangle(&self, _req: SetRectangle, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        Ok(())
+    }
+
+    fn set_fullscreen(&self, req: SetFullscreen, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        if let Some(toplevel) = self.toplevel.get() {
+            let ws = if req.output.is_some() {
+                self.client
+                    .lookup(req.output)?
+                    .global
+                    .node()
+                    .map(|node| node.ensure_workspace())
+            } else {
+                None
+            };
+            toplevel.tl_set_fullscreen(true, ws);
+        }
+        Ok(())
+    }
+
+    fn unset_fullscreen(&self, _req: UnsetFullscreen, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        if let Some(toplevel) = self.toplevel.get() {
+            toplevel.tl_set_fullscreen(false, None);
+        }
+        Ok(())
+    }
+}
+
+impl ZwlrForeignToplevelHandleV1 {
+    pub fn leave_output(&self, output: &Rc<OutputNode>) {
+        let bindings = output.global.bindings.borrow();
+        if let Some(bindings) = bindings.get(&self.client.id) {
+            for binding in bindings.values() {
+                self.send_output_leave(binding);
+            }
+        }
+    }
+
+    pub fn enter_output(&self, output: &Rc<OutputNode>) {
+        let bindings = output.global.bindings.borrow();
+        if let Some(bindings) = bindings.get(&self.client.id) {
+            for binding in bindings.values() {
+                self.send_output_enter(binding);
+            }
+        }
+    }
+
+    pub fn send_closed(&self) {
+        self.client.event(Closed { self_id: self.id });
+    }
+
+    pub fn send_done(&self) {
+        self.client.event(Done { self_id: self.id });
+    }
+
+    pub fn send_title(&self, title: &str) {
+        self.client.event(Title {
+            self_id: self.id,
+            title,
+        });
+    }
+
+    pub fn send_app_id(&self, app_id: &str) {
+        self.client.event(AppId {
+            self_id: self.id,
+            app_id,
+        });
+    }
+
+    pub fn send_state(&self, activated: bool, fullscreen: bool) {
+        let mut state: ArrayVec<u32, 2> = ArrayVec::new();
+        if activated {
+            state.push(STATE_ACTIVATED);
+        }
+        if self.version >= FULLSCREEN_SINCE {
+            if fullscreen {
+                state.push(STATE_FULLSCREEN);
+            }
+        }
+        self.client.event(State {
+            self_id: self.id,
+            state: &state,
+        });
+    }
+
+    #[expect(dead_code)]
+    pub fn send_parent(&self, parent: &Rc<ZwlrForeignToplevelHandleV1>) {
+        self.client.event(Parent {
+            self_id: self.id,
+            parent: parent.id,
+        });
+    }
+
+    pub fn send_output_enter(&self, output: &Rc<WlOutput>) {
+        self.client.event(OutputEnter {
+            self_id: self.id,
+            output: output.id,
+        });
+    }
+
+    pub fn send_output_leave(&self, output: &Rc<WlOutput>) {
+        self.client.event(OutputLeave {
+            self_id: self.id,
+            output: output.id,
+        });
+    }
+}
+
+object_base! {
+    self = ZwlrForeignToplevelHandleV1;
+    version = self.version;
+}
+
+impl Object for ZwlrForeignToplevelHandleV1 {
+    fn break_loops(&self) {
+        self.detach();
+    }
+}
+
+simple_add_obj!(ZwlrForeignToplevelHandleV1);
+
+#[derive(Debug, Error)]
+pub enum ZwlrForeignToplevelHandleV1Error {
+    #[error(transparent)]
+    ClientError(Box<ClientError>),
+}
+efrom!(ZwlrForeignToplevelHandleV1Error, ClientError);

src/ifs/zwlr_foreign_toplevel_manager_v1.rs

@@ -0,0 +1,162 @@
+use {
+    crate::{
+        client::{CAP_FOREIGN_TOPLEVEL_MANAGER, Client, ClientCaps, ClientError},
+        globals::{Global, GlobalName},
+        ifs::{
+            wl_surface::{x_surface::xwindow::Xwindow, xdg_surface::xdg_toplevel::XdgToplevel},
+            zwlr_foreign_toplevel_handle_v1::ZwlrForeignToplevelHandleV1,
+        },
+        leaks::Tracker,
+        object::{Object, Version},
+        tree::{NodeVisitorBase, ToplevelOpt},
+        wire::{ZwlrForeignToplevelManagerV1Id, zwlr_foreign_toplevel_manager_v1::*},
+    },
+    std::rc::Rc,
+    thiserror::Error,
+};
+
+pub struct ZwlrForeignToplevelManagerV1Global {
+    name: GlobalName,
+}
+
+impl ZwlrForeignToplevelManagerV1Global {
+    pub fn new(name: GlobalName) -> Self {
+        Self { name }
+    }
+
+    fn bind_(
+        self: Rc<Self>,
+        id: ZwlrForeignToplevelManagerV1Id,
+        client: &Rc<Client>,
+        version: Version,
+    ) -> Result<(), ZwlrForeignToplevelManagerV1Error> {
+        let obj = Rc::new(ZwlrForeignToplevelManagerV1 {
+            id,
+            client: client.clone(),
+            tracker: Default::default(),
+            version,
+        });
+        track!(client, obj);
+        client.add_client_obj(&obj)?;
+        ZwlrToplevelVisitor { manager: &obj }.visit_display(&client.state.root);
+        client.state.toplevel_managers.set((client.id, id), obj);
+        Ok(())
+    }
+}
+
+struct ZwlrToplevelVisitor<'a> {
+    manager: &'a ZwlrForeignToplevelManagerV1,
+}
+
+impl NodeVisitorBase for ZwlrToplevelVisitor<'_> {
+    fn visit_toplevel(&mut self, node: &Rc<XdgToplevel>) {
+        node.manager_send_to(self.manager);
+    }
+
+    fn visit_xwindow(&mut self, node: &Rc<Xwindow>) {
+        node.toplevel_data.manager_send(node.clone(), self.manager);
+    }
+}
+
+pub struct ZwlrForeignToplevelManagerV1 {
+    pub id: ZwlrForeignToplevelManagerV1Id,
+    pub client: Rc<Client>,
+    pub tracker: Tracker<Self>,
+    pub version: Version,
+}
+
+impl ZwlrForeignToplevelManagerV1 {
+    pub fn detach(&self) {
+        self.client
+            .state
+            .toplevel_managers
+            .remove(&(self.client.id, self.id));
+    }
+}
+
+impl ZwlrForeignToplevelManagerV1RequestHandler for ZwlrForeignToplevelManagerV1 {
+    type Error = ZwlrForeignToplevelManagerV1Error;
+
+    fn stop(&self, _req: Stop, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        self.detach();
+        self.send_finished();
+        self.client.remove_obj(self)?;
+        Ok(())
+    }
+}
+
+impl ZwlrForeignToplevelManagerV1 {
+    pub fn send_finished(&self) {
+        self.client.event(Finished { self_id: self.id });
+    }
+
+    pub fn send_handle(&self, handle: &ZwlrForeignToplevelHandleV1) {
+        self.client.event(Toplevel {
+            self_id: self.id,
+            toplevel: handle.id,
+        });
+    }
+
+    pub fn publish_toplevel(&self, tl: ToplevelOpt) -> Option<Rc<ZwlrForeignToplevelHandleV1>> {
+        let id = match self.client.new_id() {
+            Ok(id) => id,
+            Err(e) => {
+                self.client.error(e);
+                return None;
+            }
+        };
+        let handle = Rc::new(ZwlrForeignToplevelHandleV1 {
+            id,
+            client: self.client.clone(),
+            tracker: Default::default(),
+            version: self.version,
+            toplevel: tl,
+        });
+        track!(self.client, handle);
+        self.client.add_server_obj(&handle);
+        self.send_handle(&handle);
+        Some(handle)
+    }
+}
+
+global_base!(
+    ZwlrForeignToplevelManagerV1Global,
+    ZwlrForeignToplevelManagerV1,
+    ZwlrForeignToplevelManagerV1Error
+);
+
+impl Global for ZwlrForeignToplevelManagerV1Global {
+    fn singleton(&self) -> bool {
+        true
+    }
+
+    fn version(&self) -> u32 {
+        3
+    }
+
+    fn required_caps(&self) -> ClientCaps {
+        CAP_FOREIGN_TOPLEVEL_MANAGER
+    }
+}
+
+simple_add_global!(ZwlrForeignToplevelManagerV1Global);
+
+object_base! {
+    self = ZwlrForeignToplevelManagerV1;
+    version = self.version;
+}
+
+impl Object for ZwlrForeignToplevelManagerV1 {
+    fn break_loops(&self) {
+        self.detach();
+    }
+}
+
+simple_add_obj!(ZwlrForeignToplevelManagerV1);
+
+#[derive(Debug, Error)]
+pub enum ZwlrForeignToplevelManagerV1Error {
+    #[error(transparent)]
+    ClientError(Box<ClientError>),
+}
+efrom!(ZwlrForeignToplevelManagerV1Error, ClientError);

src/state.rs

@@ -65,6 +65,7 @@ use {
             wp_drm_lease_connector_v1::WpDrmLeaseConnectorV1,
             wp_drm_lease_device_v1::WpDrmLeaseDeviceV1Global,
             wp_linux_drm_syncobj_manager_v1::WpLinuxDrmSyncobjManagerV1Global,
+            zwlr_foreign_toplevel_manager_v1::ZwlrForeignToplevelManagerV1,
             zwlr_screencopy_frame_v1::ZwlrScreencopyFrameV1,
             zwp_linux_dmabuf_feedback_v1::ZwpLinuxDmabufFeedbackV1,
             zwp_linux_dmabuf_v1::ZwpLinuxDmabufV1Global,
@@ -104,7 +105,7 @@ use {
         wheel::Wheel,
         wire::{
             ExtForeignToplevelListV1Id, ExtIdleNotificationV1Id, JayRenderCtxId, JaySeatEventsId,
-            JayWorkspaceWatcherId, ZwpLinuxDmabufFeedbackV1Id,
+            JayWorkspaceWatcherId, ZwlrForeignToplevelManagerV1Id, ZwpLinuxDmabufFeedbackV1Id,
         },
         xwayland::{self, XWaylandEvent},
     },
@@ -240,6 +241,8 @@ pub struct State {
     pub tray_item_ids: TrayItemIds,
     pub data_control_device_ids: DataControlDeviceIds,
     pub workspace_managers: WorkspaceManagerState,
+    pub toplevel_managers:
+        CopyHashMap<(ClientId, ZwlrForeignToplevelManagerV1Id), Rc<ZwlrForeignToplevelManagerV1>>,
     pub color_management_enabled: Cell<bool>,
     pub color_manager: Rc<ColorManager>,
     pub float_above_fullscreen: Cell<bool>,

src/tree/toplevel.rs

@@ -20,6 +20,8 @@ use {
                 WlSurface, x_surface::xwindow::XwindowData,
                 xdg_surface::xdg_toplevel::XdgToplevelToplevelData,
             },
+            zwlr_foreign_toplevel_handle_v1::ZwlrForeignToplevelHandleV1,
+            zwlr_foreign_toplevel_manager_v1::ZwlrForeignToplevelManagerV1,
         },
         rect::Rect,
         state::State,
@@ -38,11 +40,12 @@ use {
         },
         wire::{
             ExtForeignToplevelHandleV1Id, ExtImageCopyCaptureSessionV1Id, JayScreencastId,
-            JayToplevelId,
+            JayToplevelId, ZwlrForeignToplevelHandleV1Id,
         },
     },
     jay_config::{window, window::WindowType},
     std::{
+        borrow::Borrow,
         cell::{Cell, RefCell},
         ops::Deref,
         rc::{Rc, Weak},
@@ -53,12 +56,12 @@ tree_id!(ToplevelNodeId);
 
 pub trait ToplevelNode: ToplevelNodeBase {
     fn tl_surface_active_changed(&self, active: bool);
-    fn tl_set_fullscreen(self: Rc<Self>, fullscreen: bool);
+    fn tl_set_fullscreen(self: Rc<Self>, fullscreen: bool, ws: Option<Rc<WorkspaceNode>>);
     fn tl_title_changed(&self);
     fn tl_set_parent(&self, parent: Rc<dyn ContainingNode>);
     fn tl_extents_changed(&self);
     fn tl_set_workspace(&self, ws: &Rc<WorkspaceNode>);
-    fn tl_workspace_output_changed(&self);
+    fn tl_workspace_output_changed(&self, prev: &Rc<OutputNode>, new: &Rc<OutputNode>);
     fn tl_change_extents(self: Rc<Self>, rect: &Rect);
     fn tl_set_visible(&self, visible: bool);
     fn tl_destroy(&self);
@@ -74,10 +77,10 @@ impl<T: ToplevelNodeBase> ToplevelNode for T {
         });
     }
 
-    fn tl_set_fullscreen(self: Rc<Self>, fullscreen: bool) {
+    fn tl_set_fullscreen(self: Rc<Self>, fullscreen: bool, ws: Option<Rc<WorkspaceNode>>) {
         let data = self.tl_data();
         if fullscreen {
-            if let Some(ws) = data.workspace.get() {
+            if let Some(ws) = ws.or_else(|| data.workspace.get()) {
                 data.set_fullscreen2(&data.state, self.clone(), &ws);
             }
         } else {
@@ -132,14 +135,17 @@ impl<T: ToplevelNodeBase> ToplevelNode for T {
         let prev = data.workspace.set(Some(ws.clone()));
         self.tl_set_workspace_ext(ws);
         self.tl_data().property_changed(TL_CHANGED_WORKSPACE);
-        let prev_id = prev.map(|p| p.output.get().id);
+        let prev_output = match &prev {
-        let new_id = Some(ws.output.get().id);
+            Some(n) => n.output.get(),
-        if prev_id != new_id {
+            _ => ws.state.dummy_output.get().unwrap(),
-            self.tl_workspace_output_changed();
+        };
+        let new_output = ws.output.get();
+        if prev.is_none() || prev_output.id != new_output.id {
+            self.tl_workspace_output_changed(&prev_output, &new_output);
         }
     }
 
-    fn tl_workspace_output_changed(&self) {
+    fn tl_workspace_output_changed(&self, prev: &Rc<OutputNode>, new: &Rc<OutputNode>) {
         let data = self.tl_data();
         for sc in data.jay_screencasts.lock().values() {
             sc.update_latch_listener();
@@ -147,6 +153,13 @@ impl<T: ToplevelNodeBase> ToplevelNode for T {
         for sc in data.ext_copy_sessions.lock().values() {
             sc.update_latch_listener();
         }
+        if prev.id != new.id {
+            for handle in data.manager_handles.borrow().lock().values() {
+                handle.leave_output(prev);
+                handle.enter_output(new);
+                handle.send_done();
+            }
+        }
     }
 
     fn tl_change_extents(self: Rc<Self>, rect: &Rect) {
@@ -322,6 +335,8 @@ pub struct ToplevelData {
     pub identifier: Cell<ToplevelIdentifier>,
     pub handles:
         CopyHashMap<(ClientId, ExtForeignToplevelHandleV1Id), Rc<ExtForeignToplevelHandleV1>>,
+    pub manager_handles:
+        CopyHashMap<(ClientId, ZwlrForeignToplevelHandleV1Id), Rc<ZwlrForeignToplevelHandleV1>>,
     pub render_highlight: NumCell<u32>,
     pub jay_toplevels: CopyHashMap<(ClientId, JayToplevelId), Rc<JayToplevel>>,
     pub jay_screencasts: CopyHashMap<(ClientId, JayScreencastId), Rc<JayScreencast>>,
@@ -372,6 +387,7 @@ impl ToplevelData {
             app_id: Default::default(),
             identifier: Cell::new(id),
             handles: Default::default(),
+            manager_handles: Default::default(),
             render_highlight: Default::default(),
             jay_toplevels: Default::default(),
             jay_screencasts: Default::default(),
@@ -397,6 +413,10 @@ impl ToplevelData {
             if let Some(parent) = self.parent.get() {
                 parent.node_child_active_changed(tl, active_new, 1);
             }
+            for handle in self.manager_handles.borrow().lock().values() {
+                handle.send_state(active_new, self.is_fullscreen.get());
+                handle.send_done();
+            }
         }
     }
 
@@ -453,6 +473,12 @@ impl ToplevelData {
                 handle.send_closed();
             }
         }
+        {
+            let mut manager_handles = self.manager_handles.lock();
+            for handle in manager_handles.drain_values() {
+                handle.send_closed();
+            }
+        }
         self.detach_node(node);
         self.property_changed(TL_CHANGED_DESTROYED);
     }
@@ -472,9 +498,29 @@ impl ToplevelData {
         let id = self.identifier.get().to_string();
         let title = self.title.borrow();
         let app_id = self.app_id.borrow();
+        let activated = self.active();
+        let fullscreen = self.is_fullscreen.get();
+        let class;
+        let manager_app_id = match &self.kind {
+            ToplevelType::XWindow(w) => {
+                class = w.info.class.borrow();
+                class.as_deref().unwrap_or_default()
+            }
+            _ => &app_id,
+        };
         for list in self.state.toplevel_lists.lock().values() {
             self.send_once(&toplevel, list, &id, &title, &app_id);
         }
+        for manager in self.state.toplevel_managers.lock().values() {
+            self.manager_send_once(
+                &toplevel,
+                manager,
+                &title,
+                manager_app_id,
+                activated,
+                fullscreen,
+            );
+        }
     }
 
     pub fn send(&self, toplevel: Rc<dyn ToplevelNode>, list: &ExtForeignToplevelListV1) {
@@ -508,12 +554,76 @@ impl ToplevelData {
             .set((handle.client.id, handle.id), handle.clone());
     }
 
+    pub fn manager_send(
+        &self,
+        toplevel: Rc<dyn ToplevelNode>,
+        manager: &ZwlrForeignToplevelManagerV1,
+    ) {
+        let title = self.title.borrow();
+        let activated = self.active();
+        let fullscreen = self.is_fullscreen.get();
+        let app_id;
+        let class;
+        let manager_app_id = match &self.kind {
+            ToplevelType::XWindow(w) => {
+                class = w.info.class.borrow();
+                class.as_deref().unwrap_or_default()
+            }
+            _ => {
+                app_id = self.app_id.borrow();
+                &app_id
+            }
+        };
+        self.manager_send_once(
+            &toplevel,
+            manager,
+            &title,
+            manager_app_id,
+            activated,
+            fullscreen,
+        );
+    }
+
+    fn manager_send_once(
+        &self,
+        toplevel: &Rc<dyn ToplevelNode>,
+        manager: &ZwlrForeignToplevelManagerV1,
+        title: &str,
+        app_id: &str,
+        activated: bool,
+        fullscreen: bool,
+    ) {
+        let opt = ToplevelOpt {
+            toplevel: Rc::downgrade(toplevel),
+            identifier: self.identifier.get(),
+        };
+        let handle = match manager.publish_toplevel(opt) {
+            None => return,
+            Some(handle) => handle,
+        };
+        if !app_id.is_empty() {
+            handle.send_app_id(app_id);
+        }
+        if !title.is_empty() {
+            handle.send_title(title);
+        }
+        handle.enter_output(&self.output());
+        handle.send_state(activated, fullscreen);
+        handle.send_done();
+        self.manager_handles
+            .set((handle.client.id, handle.id), handle.clone());
+    }
+
     pub fn set_title(&self, title: &str) {
         *self.title.borrow_mut() = title.to_string();
         for handle in self.handles.lock().values() {
             handle.send_title(title);
             handle.send_done();
         }
+        for handle in self.manager_handles.lock().values() {
+            handle.send_title(title);
+            handle.send_done();
+        }
     }
 
     pub fn set_app_id(&self, app_id: &str) {
@@ -526,6 +636,10 @@ impl ToplevelData {
             handle.send_app_id(app_id);
             handle.send_done();
         }
+        for handle in self.manager_handles.lock().values() {
+            handle.send_app_id(app_id);
+            handle.send_done();
+        }
         self.property_changed(TL_CHANGED_APP_ID)
     }
 
@@ -596,6 +710,10 @@ impl ToplevelData {
         for seat in kb_foci {
             node.clone().node_do_focus(&seat, Direction::Unspecified);
         }
+        for handle in self.manager_handles.lock().values() {
+            handle.send_state(self.active(), true);
+            handle.send_done();
+        }
     }
 
     pub fn unset_fullscreen(&self, state: &Rc<State>, node: Rc<dyn ToplevelNode>) {
@@ -641,6 +759,10 @@ impl ToplevelData {
             }
         }
         fd.placeholder.tl_destroy();
+        for handle in self.manager_handles.lock().values() {
+            handle.send_state(self.active(), false);
+            handle.send_done();
+        }
     }
 
     pub fn set_visible(&self, node: &dyn Node, visible: bool) {

src/tree/workspace.rs

@@ -103,7 +103,7 @@ impl WorkspaceNode {
     }
 
     pub fn set_output(&self, output: &Rc<OutputNode>) {
-        self.output.set(output.clone());
+        let old = self.output.set(output.clone());
         for wh in self.ext_workspaces.lock().values() {
             wh.handle_new_output(output);
         }
@@ -111,38 +111,44 @@ impl WorkspaceNode {
             jw.send_output(output);
         }
         self.update_has_captures();
-        struct OutputSetter<'a>(&'a Rc<OutputNode>);
+        struct OutputSetter<'a> {
+            old: &'a Rc<OutputNode>,
+            new: &'a Rc<OutputNode>,
+        }
         impl NodeVisitorBase for OutputSetter<'_> {
             fn visit_surface(&mut self, node: &Rc<WlSurface>) {
-                node.set_output(self.0);
+                node.set_output(self.new);
             }
 
             fn visit_container(&mut self, node: &Rc<ContainerNode>) {
-                node.tl_workspace_output_changed();
+                node.tl_workspace_output_changed(self.old, self.new);
                 node.node_visit_children(self);
             }
 
             fn visit_toplevel(&mut self, node: &Rc<XdgToplevel>) {
-                node.tl_workspace_output_changed();
+                node.tl_workspace_output_changed(self.old, self.new);
                 node.node_visit_children(self);
             }
 
             fn visit_float(&mut self, node: &Rc<FloatNode>) {
-                node.after_ws_move(self.0);
+                node.after_ws_move(self.new);
                 node.node_visit_children(self);
             }
 
             fn visit_xwindow(&mut self, node: &Rc<Xwindow>) {
-                node.tl_workspace_output_changed();
+                node.tl_workspace_output_changed(self.old, self.new);
                 node.node_visit_children(self);
             }
 
             fn visit_placeholder(&mut self, node: &Rc<PlaceholderNode>) {
-                node.tl_workspace_output_changed();
+                node.tl_workspace_output_changed(self.old, self.new);
                 node.node_visit_children(self);
             }
         }
-        let mut visitor = OutputSetter(output);
+        let mut visitor = OutputSetter {
+            old: &old,
+            new: output,
+        };
         self.node_visit_children(&mut visitor);
         for stacked in self.stacked.iter() {
             stacked.deref().clone().node_visit(&mut visitor);

src/xwayland/xwm.rs

@@ -1126,6 +1126,11 @@ impl Wm {
         let mut buf = vec![];
         let property_changed = || {
             if let Some(window) = data.window.get() {
+                let class = data.info.class.borrow();
+                for handle in window.toplevel_data.manager_handles.lock().values() {
+                    handle.send_app_id(class.as_deref().unwrap_or_default());
+                    handle.send_done();
+                }
                 window.toplevel_data.property_changed(TL_CHANGED_CLASS_INST);
             }
         };
@@ -2458,7 +2463,7 @@ impl Wm {
         }
         if fullscreen != data.info.fullscreen.get() {
             if let Some(w) = data.window.get() {
-                w.tl_set_fullscreen(fullscreen);
+                w.tl_set_fullscreen(fullscreen, None);
             }
         }
         data.info.fullscreen.set(fullscreen);

wire/zwlr_foreign_toplevel_handle_v1.txt

@@ -0,0 +1,79 @@
+# requests
+
+request set_maximized {
+
+}
+
+request unset_maximized {
+    
+}
+
+request set_minimized {
+    
+}
+
+request unset_minimized {
+    
+}
+
+request activate {
+    seat: id(wl_seat)
+}
+
+request close {
+    
+}
+
+request set_rectangle {
+    surface: id(wl_surface),
+    x: i32,
+    y: i32,
+    width: i32,
+    height: i32,
+}
+
+request destroy {
+    
+}
+
+request set_fullscreen (since = 2) {
+    output: id(wl_output)
+}
+
+request unset_fullscreen (since = 2) {
+    
+}
+
+# events
+
+event title {
+    title: str,
+}
+
+event app_id {
+    app_id: str,
+}
+
+event output_enter {
+    output: id(wl_output),
+}
+
+event output_leave {
+    output: id(wl_output),
+}
+
+event state {
+    state: array(u32),
+}
+
+event done {
+    
+}
+
+event closed {
+    
+}
+
+event parent (since = 3) {
+    parent: id(zwlr_foreign_toplevel_handle_v1)
+}

wire/zwlr_foreign_toplevel_manager_v1.txt

@@ -0,0 +1,15 @@
+# requests
+
+request stop {
+
+}
+
+# events
+
+event toplevel {
+    toplevel: id(zwlr_foreign_toplevel_handle_v1)
+}
+
+event finished {
+
+}