refactor: display metrics consolidation

adapters/src/wayland/shell_adapter.rs

@@ -60,7 +60,10 @@ impl WaylandWindowingSystem {
             Rc::clone(&connection),
         );
 
-        let popup_manager = Rc::new(PopupManager::new(popup_context, state.scale_factor()));
+        let popup_manager = Rc::new(PopupManager::new(
+            popup_context,
+            Rc::clone(state.display_metrics()),
+        ));
         let popup_service = Rc::new(PopupService::new(popup_manager));
         let shared_serial = Rc::new(SharedPointerSerial::new());
 

adapters/src/wayland/surfaces/display_metrics.rs

@@ -0,0 +1,139 @@
+use log::info;
+use slint::PhysicalSize;
+use std::cell::RefCell;
+use std::rc::{Rc, Weak};
+
+pub trait DisplayMetricsObserver {
+    fn on_scale_factor_changed(&self, new_scale: f32);
+    fn on_output_size_changed(&self, new_size: PhysicalSize);
+}
+
+pub struct DisplayMetrics {
+    scale_factor: f32,
+    output_size: PhysicalSize,
+    surface_size: PhysicalSize,
+    has_fractional_scale: bool,
+    observers: RefCell<Vec<Weak<dyn DisplayMetricsObserver>>>,
+}
+
+impl DisplayMetrics {
+    #[must_use]
+    pub fn new(scale_factor: f32, has_fractional_scale: bool) -> Self {
+        Self {
+            scale_factor,
+            output_size: PhysicalSize::new(0, 0),
+            surface_size: PhysicalSize::new(0, 0),
+            has_fractional_scale,
+            observers: RefCell::new(Vec::new()),
+        }
+    }
+
+    #[must_use]
+    pub fn with_output_size(mut self, output_size: PhysicalSize) -> Self {
+        self.output_size = output_size;
+        self
+    }
+
+    #[must_use]
+    pub const fn scale_factor(&self) -> f32 {
+        self.scale_factor
+    }
+
+    #[must_use]
+    pub const fn output_size(&self) -> PhysicalSize {
+        self.output_size
+    }
+
+    #[must_use]
+    pub const fn surface_size(&self) -> PhysicalSize {
+        self.surface_size
+    }
+
+    #[must_use]
+    pub const fn has_fractional_scale(&self) -> bool {
+        self.has_fractional_scale
+    }
+
+    pub fn register_observer(&self, observer: Weak<dyn DisplayMetricsObserver>) {
+        self.observers.borrow_mut().push(observer);
+        self.cleanup_dead_observers();
+    }
+
+    #[allow(clippy::cast_precision_loss)]
+    pub fn update_scale_factor(&mut self, scale_120ths: u32) -> f32 {
+        let new_scale_factor = scale_120ths as f32 / 120.0;
+        let old_scale_factor = self.scale_factor;
+
+        if (self.scale_factor - new_scale_factor).abs() > f32::EPSILON {
+            info!(
+                "DisplayMetrics: Updating scale factor from {} to {} ({}x)",
+                old_scale_factor, new_scale_factor, scale_120ths
+            );
+            self.scale_factor = new_scale_factor;
+            self.recalculate_surface_size();
+            self.notify_scale_factor_changed(new_scale_factor);
+        }
+
+        new_scale_factor
+    }
+
+    pub fn update_output_size(&mut self, output_size: PhysicalSize) {
+        if self.output_size != output_size {
+            info!(
+                "DisplayMetrics: Updating output size from {:?} to {:?}",
+                self.output_size, output_size
+            );
+            self.output_size = output_size;
+            self.recalculate_surface_size();
+            self.notify_output_size_changed(output_size);
+        }
+    }
+
+    pub fn update_surface_size(&mut self, surface_size: PhysicalSize) {
+        self.surface_size = surface_size;
+    }
+
+    #[allow(
+        clippy::cast_possible_truncation,
+        clippy::cast_sign_loss,
+        clippy::cast_precision_loss
+    )]
+    fn recalculate_surface_size(&mut self) {
+        if self.output_size.width > 0 && self.output_size.height > 0 && self.scale_factor > 0.0 {
+            self.surface_size = PhysicalSize::new(
+                (self.output_size.width as f32 / self.scale_factor) as u32,
+                (self.output_size.height as f32 / self.scale_factor) as u32,
+            );
+        }
+    }
+
+    fn notify_scale_factor_changed(&self, new_scale: f32) {
+        self.observers.borrow_mut().retain(|observer| {
+            if let Some(obs) = observer.upgrade() {
+                obs.on_scale_factor_changed(new_scale);
+                true
+            } else {
+                false
+            }
+        });
+    }
+
+    fn notify_output_size_changed(&self, new_size: PhysicalSize) {
+        self.observers.borrow_mut().retain(|observer| {
+            if let Some(obs) = observer.upgrade() {
+                obs.on_output_size_changed(new_size);
+                true
+            } else {
+                false
+            }
+        });
+    }
+
+    fn cleanup_dead_observers(&self) {
+        self.observers
+            .borrow_mut()
+            .retain(|obs| obs.upgrade().is_some());
+    }
+}
+
+pub type SharedDisplayMetrics = Rc<RefCell<DisplayMetrics>>;

adapters/src/wayland/surfaces/event_context.rs

@@ -1,10 +1,10 @@
 use crate::rendering::femtovg::main_window::FemtoVGWindow;
 use crate::wayland::services::popup_service::{ActiveWindow, PopupService};
+use crate::wayland::surfaces::display_metrics::SharedDisplayMetrics;
 use crate::wayland::surfaces::event_bus::EventBus;
 use crate::wayland::surfaces::popup_manager::PopupManager;
 use crate::wayland::surfaces::window_events::{ScaleSource, WindowStateEvent};
 use layer_shika_domain::value_objects::popup_request::PopupHandle;
-use log::info;
 use slint::platform::{WindowAdapter, WindowEvent};
 use slint::{LogicalPosition, PhysicalSize};
 use std::cell::Cell;
@@ -43,8 +43,7 @@ pub struct EventContext {
     main_surface_id: ObjectId,
     popup_service: Option<Rc<PopupService>>,
     event_bus: EventBus,
-    scale_factor: f32,
-    has_fractional_scale: bool,
+    display_metrics: SharedDisplayMetrics,
     current_pointer_position: LogicalPosition,
     last_pointer_serial: u32,
     shared_pointer_serial: Option<Rc<SharedPointerSerial>>,
@@ -55,16 +54,14 @@ impl EventContext {
     pub fn new(
         main_window: Rc<FemtoVGWindow>,
         main_surface_id: ObjectId,
-        scale_factor: f32,
-        has_fractional_scale: bool,
+        display_metrics: SharedDisplayMetrics,
     ) -> Self {
         Self {
             main_window,
             main_surface_id,
             popup_service: None,
             event_bus: EventBus::new(),
-            scale_factor,
-            has_fractional_scale,
+            display_metrics,
             current_pointer_position: LogicalPosition::new(0.0, 0.0),
             last_pointer_serial: 0,
             shared_pointer_serial: None,
@@ -95,19 +92,21 @@ impl EventContext {
             .map(|service| Rc::clone(service.manager()))
     }
 
-    pub const fn scale_factor(&self) -> f32 {
-        self.scale_factor
+    #[must_use]
+    pub fn scale_factor(&self) -> f32 {
+        self.display_metrics.borrow().scale_factor()
+    }
+
+    pub const fn display_metrics(&self) -> &SharedDisplayMetrics {
+        &self.display_metrics
     }
 
     #[allow(clippy::cast_precision_loss)]
     pub fn update_scale_factor(&mut self, scale_120ths: u32) -> f32 {
-        let new_scale_factor = scale_120ths as f32 / 120.0;
-        let old_scale_factor = self.scale_factor;
-        info!(
-            "Updating scale factor from {} to {} ({}x)",
-            old_scale_factor, new_scale_factor, scale_120ths
-        );
-        self.scale_factor = new_scale_factor;
+        let new_scale_factor = self
+            .display_metrics
+            .borrow_mut()
+            .update_scale_factor(scale_120ths);
 
         if let Some(popup_service) = &self.popup_service {
             popup_service.update_scale_factor(new_scale_factor);
@@ -128,12 +127,15 @@ impl EventContext {
 
     #[allow(clippy::cast_possible_truncation)]
     pub fn set_current_pointer_position(&mut self, physical_x: f64, physical_y: f64) {
-        let logical_position = if self.has_fractional_scale {
+        let has_fractional_scale = self.display_metrics.borrow().has_fractional_scale();
+        let scale_factor = self.display_metrics.borrow().scale_factor();
+
+        let logical_position = if has_fractional_scale {
             LogicalPosition::new(physical_x as f32, physical_y as f32)
         } else {
             LogicalPosition::new(
-                (physical_x / f64::from(self.scale_factor)) as f32,
-                (physical_y / f64::from(self.scale_factor)) as f32,
+                (physical_x / f64::from(scale_factor)) as f32,
+                (physical_y / f64::from(scale_factor)) as f32,
             )
         };
         self.current_pointer_position = logical_position;

adapters/src/wayland/surfaces/mod.rs

@@ -1,5 +1,6 @@
 pub mod component_state;
 pub mod dimensions;
+pub mod display_metrics;
 pub mod event_bus;
 pub mod event_context;
 pub mod event_router;

adapters/src/wayland/surfaces/popup_manager.rs

@@ -1,6 +1,7 @@
 use crate::errors::{LayerShikaError, Result};
 use crate::rendering::egl::context::EGLContext;
 use crate::rendering::femtovg::popup_window::PopupWindow;
+use crate::wayland::surfaces::display_metrics::{DisplayMetricsObserver, SharedDisplayMetrics};
 use layer_shika_domain::value_objects::popup_config::PopupConfig;
 use layer_shika_domain::value_objects::popup_positioning_mode::PopupPositioningMode;
 use layer_shika_domain::value_objects::popup_request::PopupRequest;
@@ -101,19 +102,17 @@ struct PendingPopup {
 
 struct PopupManagerState {
     popups: HashMap<PopupId, ActivePopup>,
-    scale_factor: f32,
-    output_size: PhysicalSize,
+    display_metrics: SharedDisplayMetrics,
     current_popup_id: Option<PopupId>,
     pending_popup: Option<PendingPopup>,
     id_generator: usize,
 }
 
 impl PopupManagerState {
-    fn new(initial_scale_factor: f32) -> Self {
+    fn new(display_metrics: SharedDisplayMetrics) -> Self {
         Self {
             popups: HashMap::new(),
-            scale_factor: initial_scale_factor,
-            output_size: PhysicalSize::new(0, 0),
+            display_metrics,
             current_popup_id: None,
             pending_popup: None,
             id_generator: 0,
@@ -128,10 +127,10 @@ pub struct PopupManager {
 
 impl PopupManager {
     #[must_use]
-    pub fn new(context: PopupContext, initial_scale_factor: f32) -> Self {
+    pub fn new(context: PopupContext, display_metrics: SharedDisplayMetrics) -> Self {
         Self {
             context,
-            state: RefCell::new(PopupManagerState::new(initial_scale_factor)),
+            state: RefCell::new(PopupManagerState::new(display_metrics)),
         }
     }
 
@@ -154,20 +153,34 @@ impl PopupManager {
 
     #[must_use]
     pub fn scale_factor(&self) -> f32 {
-        self.state.borrow().scale_factor
+        self.state.borrow().display_metrics.borrow().scale_factor()
     }
 
     #[must_use]
     pub fn output_size(&self) -> PhysicalSize {
-        self.state.borrow().output_size
+        self.state.borrow().display_metrics.borrow().output_size()
     }
 
+    #[allow(clippy::cast_possible_truncation, clippy::cast_sign_loss)]
     pub fn update_scale_factor(&self, scale_factor: f32) {
-        self.state.borrow_mut().scale_factor = scale_factor;
+        let scale_120ths = (scale_factor * 120.0) as u32;
+        self.state
+            .borrow()
+            .display_metrics
+            .borrow_mut()
+            .update_scale_factor(scale_120ths);
+
+        for popup in self.state.borrow().popups.values() {
+            popup.window.set_scale_factor(scale_factor);
+        }
     }
 
     pub fn update_output_size(&self, output_size: PhysicalSize) {
-        self.state.borrow_mut().output_size = output_size;
+        self.state
+            .borrow()
+            .display_metrics
+            .borrow_mut()
+            .update_output_size(output_size);
     }
 
     pub fn close_current_popup(&self) {
@@ -390,3 +403,16 @@ impl PopupManager {
         }
     }
 }
+
+impl DisplayMetricsObserver for PopupManager {
+    fn on_scale_factor_changed(&self, new_scale: f32) {
+        info!("PopupManager received scale factor change: {}", new_scale);
+        for popup in self.state.borrow().popups.values() {
+            popup.window.set_scale_factor(new_scale);
+        }
+    }
+
+    fn on_output_size_changed(&self, new_size: PhysicalSize) {
+        info!("PopupManager received output size change: {:?}", new_size);
+    }
+}

adapters/src/wayland/surfaces/surface_state.rs

@@ -6,6 +6,7 @@ use super::rendering_state::RenderingState;
 use super::event_context::{EventContext, SharedPointerSerial};
 use super::popup_manager::PopupManager;
 use super::window_renderer::WindowRendererParams;
+use super::display_metrics::{DisplayMetrics, SharedDisplayMetrics};
 use crate::wayland::managed_proxies::{
     ManagedWlPointer, ManagedWlSurface, ManagedZwlrLayerSurfaceV1,
     ManagedWpFractionalScaleV1, ManagedWpViewport,
@@ -28,9 +29,9 @@ pub struct WindowState {
     component: ComponentState,
     rendering: RenderingState,
     event_context: EventContext,
+    display_metrics: SharedDisplayMetrics,
     #[allow(dead_code)]
     pointer: ManagedWlPointer,
-    output_size: PhysicalSize,
     active_popup_key: RefCell<Option<usize>>,
     main_surface: Rc<WlSurface>,
 }
@@ -90,11 +91,16 @@ impl WindowState {
         let size = builder.size.unwrap_or_default();
 
         let main_surface_id = (*surface_rc).id();
+
+        let display_metrics = Rc::new(RefCell::new(
+            DisplayMetrics::new(builder.scale_factor, has_fractional_scale)
+                .with_output_size(builder.output_size.unwrap_or_default()),
+        ));
+
         let event_context = EventContext::new(
             Rc::clone(&window),
             main_surface_id,
-            builder.scale_factor,
-            has_fractional_scale,
+            Rc::clone(&display_metrics),
         );
 
         let rendering = RenderingState::new(WindowRendererParams {
@@ -112,8 +118,8 @@ impl WindowState {
             component,
             rendering,
             event_context,
+            display_metrics,
             pointer,
-            output_size: builder.output_size.unwrap_or_default(),
             active_popup_key: RefCell::new(None),
             main_surface: surface_rc,
         })
@@ -151,12 +157,14 @@ impl WindowState {
     }
 
     pub fn set_output_size(&mut self, output_size: PhysicalSize) {
-        self.output_size = output_size;
+        self.display_metrics
+            .borrow_mut()
+            .update_output_size(output_size);
         self.event_context.update_output_size(output_size);
     }
 
-    pub const fn output_size(&self) -> PhysicalSize {
-        self.output_size
+    pub fn output_size(&self) -> PhysicalSize {
+        self.display_metrics.borrow().output_size()
     }
 
     pub const fn component_instance(&self) -> &ComponentInstance {
@@ -186,6 +194,10 @@ impl WindowState {
         self.event_context.scale_factor()
     }
 
+    pub const fn display_metrics(&self) -> &SharedDisplayMetrics {
+        &self.display_metrics
+    }
+
     pub fn last_pointer_serial(&self) -> u32 {
         self.event_context.last_pointer_serial()
     }
@@ -203,6 +215,10 @@ impl WindowState {
     }
 
     pub fn set_popup_manager(&mut self, popup_manager: Rc<PopupManager>) {
+        self.display_metrics
+            .borrow()
+            .register_observer(Rc::downgrade(&popup_manager) as _);
+
         let popup_service = Rc::new(PopupService::new(popup_manager));
         self.event_context.set_popup_service(popup_service);
     }