feat: add surface command for shell control

crates/adapters/src/wayland/surfaces/app_state.rs

@@ -376,6 +376,16 @@ impl AppState {
             .map(|(_, v)| v)
     }
 
+    pub fn surfaces_by_name_mut(
+        &mut self,
+        surface_name: &str,
+    ) -> impl Iterator<Item = &mut PerOutputSurface> {
+        self.surfaces
+            .iter_mut()
+            .filter(move |(k, _)| k.surface_name == surface_name)
+            .map(|(_, v)| v)
+    }
+
     pub fn get_output_by_handle(&self, handle: OutputHandle) -> Option<&PerOutputSurface> {
         self.get_first_surface_for_output(handle)
     }

crates/adapters/src/wayland/surfaces/surface_state.rs

@@ -123,6 +123,42 @@ impl SurfaceState {
         self.rendering.update_size(width, height, scale_factor);
     }
 
+    #[allow(clippy::cast_precision_loss)]
+    #[allow(clippy::cast_possible_truncation)]
+    #[allow(clippy::cast_sign_loss)]
+    pub fn update_size_with_compositor_logic(
+        &mut self,
+        requested_width: u32,
+        requested_height: u32,
+    ) {
+        let scale_factor = self.event_context.borrow().scale_factor();
+        let output_width = self.output_size().width;
+
+        let target_width = if requested_width == 0 || (requested_width == 1 && output_width > 1) {
+            if scale_factor > 1.0 {
+                (output_width as f32 / scale_factor).round() as u32
+            } else {
+                output_width
+            }
+        } else {
+            requested_width
+        };
+
+        let target_height = if requested_height > 0 {
+            requested_height
+        } else {
+            let h = self.height();
+            if scale_factor > 1.0 {
+                (h as f32 / scale_factor).round() as u32
+            } else {
+                h
+            }
+        };
+
+        self.rendering
+            .update_size(target_width, target_height, scale_factor);
+    }
+
     #[allow(clippy::cast_possible_truncation)]
     pub fn set_current_pointer_position(&mut self, physical_x: f64, physical_y: f64) {
         self.event_context

crates/composition/src/layer_surface.rs

@@ -1,6 +1,7 @@
 use layer_shika_adapters::SurfaceState;
 use layer_shika_adapters::platform::slint_interpreter::ComponentInstance;
 use layer_shika_adapters::platform::wayland::{Anchor, WaylandKeyboardInteractivity, WaylandLayer};
+use layer_shika_domain::value_objects::anchor::AnchorEdges;
 use layer_shika_domain::value_objects::keyboard_interactivity::KeyboardInteractivity;
 use layer_shika_domain::value_objects::layer::Layer;
 use layer_shika_domain::value_objects::margins::Margins;
@@ -18,6 +19,30 @@ impl<'a> LayerSurfaceHandle<'a> {
         self.window_state.layer_surface().set_anchor(anchor);
     }
 
+    pub fn set_anchor_edges(&self, anchor: AnchorEdges) {
+        let wayland_anchor = Self::convert_anchor(anchor);
+        self.window_state.layer_surface().set_anchor(wayland_anchor);
+    }
+
+    fn convert_anchor(anchor: AnchorEdges) -> Anchor {
+        let mut result = Anchor::empty();
+
+        if anchor.has_top() {
+            result = result.union(Anchor::Top);
+        }
+        if anchor.has_bottom() {
+            result = result.union(Anchor::Bottom);
+        }
+        if anchor.has_left() {
+            result = result.union(Anchor::Left);
+        }
+        if anchor.has_right() {
+            result = result.union(Anchor::Right);
+        }
+
+        result
+    }
+
     pub fn set_size(&self, width: u32, height: u32) {
         self.window_state.layer_surface().set_size(width, height);
     }

crates/composition/src/lib.rs

@@ -33,7 +33,7 @@ pub use layer_shika_domain::value_objects::popup_request::{
 pub use layer_surface::{LayerSurfaceHandle, ShellSurfaceConfigHandler};
 pub use popup_builder::PopupBuilder;
 pub use shell_runtime::{DEFAULT_SURFACE_NAME, ShellRuntime};
-pub use system::{EventDispatchContext, ShellControl};
+pub use system::{EventDispatchContext, ShellControl, SurfaceControlHandle};
 pub use value_conversion::IntoValue;
 
 pub use shell::{
@@ -70,8 +70,9 @@ pub mod prelude {
         OutputPolicy, OutputRegistry, PopupBuilder, PopupHandle, PopupPlacement,
         PopupPositioningMode, PopupRequest, PopupSize, PopupWindow, Result, Shell, ShellBuilder,
         ShellConfig, ShellControl, ShellEventContext, ShellEventLoop, ShellRuntime,
-        ShellSurfaceConfigHandler, SurfaceComponentConfig, SurfaceConfigBuilder, SurfaceDefinition,
+        ShellSurfaceConfigHandler, SurfaceComponentConfig, SurfaceConfigBuilder,
-        SurfaceEntry, SurfaceHandle, SurfaceMetadata, SurfaceRegistry,
+        SurfaceControlHandle, SurfaceDefinition, SurfaceEntry, SurfaceHandle, SurfaceMetadata,
+        SurfaceRegistry,
     };
 
     pub use crate::calloop::{Generic, Interest, Mode, PostAction, RegistrationToken, Timer};

crates/composition/src/shell.rs

@@ -4,7 +4,9 @@ use crate::popup_builder::PopupBuilder;
 use crate::shell_config::{CompiledUiSource, ShellConfig};
 use crate::shell_runtime::ShellRuntime;
 use crate::surface_registry::{SurfaceDefinition, SurfaceEntry, SurfaceRegistry};
-use crate::system::{PopupCommand, ShellControl};
+use crate::system::{
+    EventDispatchContext, PopupCommand, ShellCommand, ShellControl, SurfaceCommand,
+};
 use crate::value_conversion::IntoValue;
 use crate::{Error, Result};
 use layer_shika_adapters::errors::EventLoopError;
@@ -220,7 +222,7 @@ pub struct Shell {
     inner: Rc<RefCell<dyn WaylandSystemOps>>,
     registry: SurfaceRegistry,
     compilation_result: Rc<CompilationResult>,
-    popup_command_sender: channel::Sender<PopupCommand>,
+    command_sender: channel::Sender<ShellCommand>,
     output_connected_handlers: Rc<RefCell<Vec<OutputConnectedHandler>>>,
     output_disconnected_handlers: Rc<RefCell<Vec<OutputDisconnectedHandler>>>,
 }
@@ -403,12 +405,12 @@ impl Shell {
             inner: Rc::clone(&inner_rc),
             registry,
             compilation_result,
-            popup_command_sender: sender,
+            command_sender: sender,
             output_connected_handlers: Rc::new(RefCell::new(Vec::new())),
             output_disconnected_handlers: Rc::new(RefCell::new(Vec::new())),
         };
 
-        shell.setup_popup_command_handler(receiver)?;
+        shell.setup_command_handler(receiver)?;
 
         log::info!("Shell created (single-window mode)");
 
@@ -463,12 +465,12 @@ impl Shell {
             inner: Rc::clone(&inner_rc),
             registry,
             compilation_result,
-            popup_command_sender: sender,
+            command_sender: sender,
             output_connected_handlers: Rc::new(RefCell::new(Vec::new())),
             output_disconnected_handlers: Rc::new(RefCell::new(Vec::new())),
         };
 
-        shell.setup_popup_command_handler(receiver)?;
+        shell.setup_command_handler(receiver)?;
 
         log::info!(
             "Shell created (multi-surface mode) with surfaces: {:?}",
@@ -478,7 +480,7 @@ impl Shell {
         Ok(shell)
     }
 
-    fn setup_popup_command_handler(&self, receiver: channel::Channel<PopupCommand>) -> Result<()> {
+    fn setup_command_handler(&self, receiver: channel::Channel<ShellCommand>) -> Result<()> {
         let loop_handle = self.inner.borrow().event_loop_handle();
         let control = self.control();
 
@@ -488,23 +490,15 @@ impl Shell {
                     let mut ctx = crate::system::EventDispatchContext::from_app_state(app_state);
 
                     match command {
-                        PopupCommand::Show(request) => {
+                        ShellCommand::Popup(popup_cmd) => {
-                            if let Err(e) = ctx.show_popup(&request, Some(control.clone())) {
+                            Self::handle_popup_command(popup_cmd, &mut ctx, &control);
-                                log::error!("Failed to show popup: {}", e);
-                            }
                         }
-                        PopupCommand::Close(handle) => {
+                        ShellCommand::Surface(surface_cmd) => {
-                            if let Err(e) = ctx.close_popup(handle) {
+                            Self::handle_surface_command(surface_cmd, &mut ctx);
-                                log::error!("Failed to close popup: {}", e);
-                            }
                         }
-                        PopupCommand::Resize {
+                        ShellCommand::Render => {
-                            handle,
+                            if let Err(e) = ctx.render_frame_if_dirty() {
-                            width,
+                                log::error!("Failed to render frame: {}", e);
-                            height,
-                        } => {
-                            if let Err(e) = ctx.resize_popup(handle, width, height) {
-                                log::error!("Failed to resize popup: {}", e);
                             }
                         }
                     }
@@ -513,7 +507,7 @@ impl Shell {
             .map_err(|e| {
                 Error::Adapter(
                     EventLoopError::InsertSource {
-                        message: format!("Failed to setup popup command handler: {e:?}"),
+                        message: format!("Failed to setup command handler: {e:?}"),
                     }
                     .into(),
                 )
@@ -522,9 +516,134 @@ impl Shell {
         Ok(())
     }
 
+    fn handle_popup_command(
+        command: PopupCommand,
+        ctx: &mut EventDispatchContext<'_>,
+        control: &ShellControl,
+    ) {
+        match command {
+            PopupCommand::Show(request) => {
+                if let Err(e) = ctx.show_popup(&request, Some(control.clone())) {
+                    log::error!("Failed to show popup: {}", e);
+                }
+            }
+            PopupCommand::Close(handle) => {
+                if let Err(e) = ctx.close_popup(handle) {
+                    log::error!("Failed to close popup: {}", e);
+                }
+            }
+            PopupCommand::Resize {
+                handle,
+                width,
+                height,
+            } => {
+                if let Err(e) = ctx.resize_popup(handle, width, height) {
+                    log::error!("Failed to resize popup: {}", e);
+                }
+            }
+        }
+    }
+
+    fn handle_surface_command(command: SurfaceCommand, ctx: &mut EventDispatchContext<'_>) {
+        match command {
+            SurfaceCommand::Resize {
+                name,
+                width,
+                height,
+            } => {
+                log::debug!("Surface command: Resize '{}' to {}x{}", name, width, height);
+                for surface in ctx.surfaces_by_name_mut(&name) {
+                    let handle = LayerSurfaceHandle::from_window_state(surface);
+                    handle.set_size(width, height);
+                    handle.commit();
+
+                    surface.update_size_with_compositor_logic(width, height);
+                }
+            }
+            SurfaceCommand::SetAnchor { name, anchor } => {
+                log::debug!("Surface command: SetAnchor '{}' to {:?}", name, anchor);
+                for surface in ctx.surfaces_by_name(&name) {
+                    let handle = LayerSurfaceHandle::from_window_state(surface);
+                    handle.set_anchor_edges(anchor);
+                    handle.commit();
+                }
+            }
+            SurfaceCommand::SetExclusiveZone { name, zone } => {
+                log::debug!("Surface command: SetExclusiveZone '{}' to {}", name, zone);
+                for surface in ctx.surfaces_by_name(&name) {
+                    let handle = LayerSurfaceHandle::from_window_state(surface);
+                    handle.set_exclusive_zone(zone);
+                    handle.commit();
+                }
+            }
+            SurfaceCommand::SetMargins { name, margins } => {
+                log::debug!("Surface command: SetMargins '{}' to {:?}", name, margins);
+                for surface in ctx.surfaces_by_name(&name) {
+                    let handle = LayerSurfaceHandle::from_window_state(surface);
+                    handle.set_margins(margins);
+                    handle.commit();
+                }
+            }
+            SurfaceCommand::SetLayer { name, layer } => {
+                log::debug!("Surface command: SetLayer '{}' to {:?}", name, layer);
+                for surface in ctx.surfaces_by_name(&name) {
+                    let handle = LayerSurfaceHandle::from_window_state(surface);
+                    handle.set_layer(layer);
+                    handle.commit();
+                }
+            }
+            SurfaceCommand::SetKeyboardInteractivity { name, mode } => {
+                log::debug!(
+                    "Surface command: SetKeyboardInteractivity '{}' to {:?}",
+                    name,
+                    mode
+                );
+                for surface in ctx.surfaces_by_name(&name) {
+                    let handle = LayerSurfaceHandle::from_window_state(surface);
+                    handle.set_keyboard_interactivity(mode);
+                    handle.commit();
+                }
+            }
+            SurfaceCommand::SetOutputPolicy { name, policy } => {
+                log::debug!(
+                    "Surface command: SetOutputPolicy '{}' to {:?}",
+                    name,
+                    policy
+                );
+                log::warn!(
+                    "SetOutputPolicy is not yet implemented - requires runtime surface spawning"
+                );
+            }
+            SurfaceCommand::SetScaleFactor { name, factor } => {
+                log::debug!("Surface command: SetScaleFactor '{}' to {:?}", name, factor);
+                log::warn!(
+                    "SetScaleFactor is not yet implemented - requires runtime surface property updates"
+                );
+            }
+            SurfaceCommand::ApplyConfig { name, config } => {
+                log::debug!("Surface command: ApplyConfig '{}'", name);
+                for surface in ctx.surfaces_by_name(&name) {
+                    let handle = LayerSurfaceHandle::from_window_state(surface);
+
+                    handle.set_size(config.dimensions.width(), config.dimensions.height());
+                    handle.set_anchor_edges(config.anchor);
+                    handle.set_exclusive_zone(config.exclusive_zone);
+                    handle.set_margins(config.margin);
+                    handle.set_layer(config.layer);
+                    handle.set_keyboard_interactivity(config.keyboard_interactivity);
+                    handle.commit();
+                }
+            }
+        }
+
+        if let Err(e) = ctx.render_frame_if_dirty() {
+            log::error!("Failed to render frame after surface command: {}", e);
+        }
+    }
+
     #[must_use]
     pub fn control(&self) -> ShellControl {
-        ShellControl::new(self.popup_command_sender.clone())
+        ShellControl::new(self.command_sender.clone())
     }
 
     pub fn surface_names(&self) -> Vec<&str> {

crates/composition/src/system.rs

@@ -1,4 +1,5 @@
 use crate::event_loop::FromAppState;
+use crate::layer_surface::LayerSurfaceHandle;
 use crate::{Error, Result};
 use layer_shika_adapters::platform::calloop::channel;
 use layer_shika_adapters::platform::slint::ComponentHandle;
@@ -6,8 +7,12 @@ use layer_shika_adapters::platform::slint_interpreter::{
     CompilationResult, ComponentDefinition, ComponentInstance, Value,
 };
 use layer_shika_adapters::{AppState, PopupManager, SurfaceState};
+use layer_shika_domain::config::SurfaceConfig;
 use layer_shika_domain::entities::output_registry::OutputRegistry;
 use layer_shika_domain::errors::DomainError;
+use layer_shika_domain::prelude::{
+    AnchorEdges, KeyboardInteractivity, Layer, Margins, OutputPolicy, ScaleFactor,
+};
 use layer_shika_domain::value_objects::dimensions::PopupDimensions;
 use layer_shika_domain::value_objects::output_handle::OutputHandle;
 use layer_shika_domain::value_objects::output_info::OutputInfo;
@@ -28,19 +33,65 @@ pub enum PopupCommand {
     },
 }
 
+pub enum SurfaceCommand {
+    Resize {
+        name: String,
+        width: u32,
+        height: u32,
+    },
+    SetAnchor {
+        name: String,
+        anchor: AnchorEdges,
+    },
+    SetExclusiveZone {
+        name: String,
+        zone: i32,
+    },
+    SetMargins {
+        name: String,
+        margins: Margins,
+    },
+    SetLayer {
+        name: String,
+        layer: Layer,
+    },
+    SetOutputPolicy {
+        name: String,
+        policy: OutputPolicy,
+    },
+    SetScaleFactor {
+        name: String,
+        factor: ScaleFactor,
+    },
+    SetKeyboardInteractivity {
+        name: String,
+        mode: KeyboardInteractivity,
+    },
+    ApplyConfig {
+        name: String,
+        config: SurfaceConfig,
+    },
+}
+
+pub enum ShellCommand {
+    Popup(PopupCommand),
+    Surface(SurfaceCommand),
+    Render,
+}
+
 #[derive(Clone)]
 pub struct ShellControl {
-    sender: channel::Sender<PopupCommand>,
+    sender: channel::Sender<ShellCommand>,
 }
 
 impl ShellControl {
-    pub fn new(sender: channel::Sender<PopupCommand>) -> Self {
+    pub fn new(sender: channel::Sender<ShellCommand>) -> Self {
         Self { sender }
     }
 
     pub fn show_popup(&self, request: &PopupRequest) -> Result<()> {
         self.sender
-            .send(PopupCommand::Show(request.clone()))
+            .send(ShellCommand::Popup(PopupCommand::Show(request.clone())))
             .map_err(|_| {
                 Error::Domain(DomainError::Configuration {
                     message: "Failed to send popup show command: channel closed".to_string(),
@@ -76,26 +127,186 @@ impl ShellControl {
     }
 
     pub fn close_popup(&self, handle: PopupHandle) -> Result<()> {
-        self.sender.send(PopupCommand::Close(handle)).map_err(|_| {
+        self.sender
-            Error::Domain(DomainError::Configuration {
+            .send(ShellCommand::Popup(PopupCommand::Close(handle)))
-                message: "Failed to send popup close command: channel closed".to_string(),
+            .map_err(|_| {
+                Error::Domain(DomainError::Configuration {
+                    message: "Failed to send popup close command: channel closed".to_string(),
+                })
             })
-        })
     }
 
     pub fn resize_popup(&self, handle: PopupHandle, width: f32, height: f32) -> Result<()> {
         self.sender
-            .send(PopupCommand::Resize {
+            .send(ShellCommand::Popup(PopupCommand::Resize {
                 handle,
                 width,
                 height,
-            })
+            }))
             .map_err(|_| {
                 Error::Domain(DomainError::Configuration {
                     message: "Failed to send popup resize command: channel closed".to_string(),
                 })
             })
     }
+
+    pub fn request_redraw(&self) -> Result<()> {
+        self.sender.send(ShellCommand::Render).map_err(|_| {
+            Error::Domain(DomainError::Configuration {
+                message: "Failed to send redraw command: channel closed".to_string(),
+            })
+        })
+    }
+
+    pub fn surface(&self, name: impl Into<String>) -> SurfaceControlHandle {
+        SurfaceControlHandle {
+            name: name.into(),
+            sender: self.sender.clone(),
+        }
+    }
+}
+
+pub struct SurfaceControlHandle {
+    name: String,
+    sender: channel::Sender<ShellCommand>,
+}
+
+impl SurfaceControlHandle {
+    pub fn resize(&self, width: u32, height: u32) -> Result<()> {
+        self.sender
+            .send(ShellCommand::Surface(SurfaceCommand::Resize {
+                name: self.name.clone(),
+                width,
+                height,
+            }))
+            .map_err(|_| {
+                Error::Domain(DomainError::Configuration {
+                    message: "Failed to send surface resize command: channel closed".to_string(),
+                })
+            })
+    }
+
+    pub fn set_width(&self, width: u32) -> Result<()> {
+        self.resize(width, 0)
+    }
+
+    pub fn set_height(&self, height: u32) -> Result<()> {
+        self.resize(0, height)
+    }
+
+    pub fn set_anchor(&self, anchor: AnchorEdges) -> Result<()> {
+        self.sender
+            .send(ShellCommand::Surface(SurfaceCommand::SetAnchor {
+                name: self.name.clone(),
+                anchor,
+            }))
+            .map_err(|_| {
+                Error::Domain(DomainError::Configuration {
+                    message: "Failed to send surface set_anchor command: channel closed"
+                        .to_string(),
+                })
+            })
+    }
+
+    pub fn set_exclusive_zone(&self, zone: i32) -> Result<()> {
+        self.sender
+            .send(ShellCommand::Surface(SurfaceCommand::SetExclusiveZone {
+                name: self.name.clone(),
+                zone,
+            }))
+            .map_err(|_| {
+                Error::Domain(DomainError::Configuration {
+                    message: "Failed to send surface set_exclusive_zone command: channel closed"
+                        .to_string(),
+                })
+            })
+    }
+
+    pub fn set_margins(&self, margins: impl Into<Margins>) -> Result<()> {
+        self.sender
+            .send(ShellCommand::Surface(SurfaceCommand::SetMargins {
+                name: self.name.clone(),
+                margins: margins.into(),
+            }))
+            .map_err(|_| {
+                Error::Domain(DomainError::Configuration {
+                    message: "Failed to send surface set_margins command: channel closed"
+                        .to_string(),
+                })
+            })
+    }
+
+    pub fn set_layer(&self, layer: Layer) -> Result<()> {
+        self.sender
+            .send(ShellCommand::Surface(SurfaceCommand::SetLayer {
+                name: self.name.clone(),
+                layer,
+            }))
+            .map_err(|_| {
+                Error::Domain(DomainError::Configuration {
+                    message: "Failed to send surface set_layer command: channel closed".to_string(),
+                })
+            })
+    }
+
+    pub fn set_output_policy(&self, policy: OutputPolicy) -> Result<()> {
+        self.sender
+            .send(ShellCommand::Surface(SurfaceCommand::SetOutputPolicy {
+                name: self.name.clone(),
+                policy,
+            }))
+            .map_err(|_| {
+                Error::Domain(DomainError::Configuration {
+                    message: "Failed to send surface set_output_policy command: channel closed"
+                        .to_string(),
+                })
+            })
+    }
+
+    pub fn set_scale_factor(&self, factor: ScaleFactor) -> Result<()> {
+        self.sender
+            .send(ShellCommand::Surface(SurfaceCommand::SetScaleFactor {
+                name: self.name.clone(),
+                factor,
+            }))
+            .map_err(|_| {
+                Error::Domain(DomainError::Configuration {
+                    message: "Failed to send surface set_scale_factor command: channel closed"
+                        .to_string(),
+                })
+            })
+    }
+
+    pub fn set_keyboard_interactivity(&self, mode: KeyboardInteractivity) -> Result<()> {
+        self.sender
+            .send(ShellCommand::Surface(
+                SurfaceCommand::SetKeyboardInteractivity {
+                    name: self.name.clone(),
+                    mode,
+                },
+            ))
+            .map_err(|_| {
+                Error::Domain(DomainError::Configuration {
+                    message:
+                        "Failed to send surface set_keyboard_interactivity command: channel closed"
+                            .to_string(),
+                })
+            })
+    }
+
+    pub fn apply_config(&self, config: SurfaceConfig) -> Result<()> {
+        self.sender
+            .send(ShellCommand::Surface(SurfaceCommand::ApplyConfig {
+                name: self.name.clone(),
+                config,
+            }))
+            .map_err(|_| {
+                Error::Domain(DomainError::Configuration {
+                    message: "Failed to send surface apply_config command: channel closed"
+                        .to_string(),
+                })
+            })
+    }
 }
 
 pub struct EventDispatchContext<'a> {
@@ -121,6 +332,17 @@ fn extract_dimensions_from_callback(args: &[Value]) -> PopupDimensions {
 }
 
 impl EventDispatchContext<'_> {
+    pub(crate) fn surfaces_by_name(&self, name: &str) -> impl Iterator<Item = &SurfaceState> {
+        self.app_state.surfaces_by_name(name)
+    }
+
+    pub(crate) fn surfaces_by_name_mut(
+        &mut self,
+        name: &str,
+    ) -> impl Iterator<Item = &mut SurfaceState> {
+        self.app_state.surfaces_by_name_mut(name)
+    }
+
     pub fn with_surface<F, R>(&self, name: &str, f: F) -> Result<R>
     where
         F: FnOnce(&ComponentInstance) -> R,
@@ -572,4 +794,35 @@ impl EventDispatchContext<'_> {
                 })
             })
     }
+
+    pub fn configure_surface<F>(&mut self, name: &str, f: F) -> Result<()>
+    where
+        F: FnOnce(&ComponentInstance, LayerSurfaceHandle<'_>),
+    {
+        let surface = self
+            .app_state
+            .surfaces_by_name(name)
+            .next()
+            .ok_or_else(|| {
+                Error::Domain(DomainError::Configuration {
+                    message: format!("Surface '{}' not found", name),
+                })
+            })?;
+
+        let handle = LayerSurfaceHandle::from_window_state(surface);
+        let component = surface.component_instance();
+        f(component, handle);
+        Ok(())
+    }
+
+    pub fn configure_all_surfaces<F>(&mut self, mut f: F)
+    where
+        F: FnMut(&ComponentInstance, LayerSurfaceHandle<'_>),
+    {
+        for surface in self.app_state.all_outputs() {
+            let handle = LayerSurfaceHandle::from_window_state(surface);
+            let component = surface.component_instance();
+            f(component, handle);
+        }
+    }
 }