Simplify event loop start-up

Move the layout constraint tracker into the window where we can apply
the constraints right before drawing, instead of doing that from within
the event loop. This allows to remove the component parameter from the
run function.

api/sixtyfps-cpp/include/sixtyfps.h

@@ -84,9 +84,7 @@ public:
     template<typename Component>
     void run(const Component *c) const
     {
-        auto self_rc = c->self_weak.lock().value();
-        sixtyfps_component_window_run(&inner,
-                                      reinterpret_cast<cbindgen_private::ComponentRc *>(&self_rc));
+        sixtyfps_component_window_run(&inner);
     }
 
     float scale_factor() const { return sixtyfps_component_window_get_scale_factor(&inner); }

api/sixtyfps-node/native/lib.rs

@@ -329,7 +329,7 @@ declare_types! {
             let component = cx.borrow(&mut this, |x| x.0.clone());
             let component = component.ok_or(()).or_else(|()| cx.throw_error("Invalid type"))?;
             run_scoped(&mut cx,this.downcast().unwrap(), || {
-                component.window().run(&vtable::VRc::into_dyn(component));
+                component.window().run();
                 Ok(())
             })?;
             Ok(JsUndefined::new().as_value(&mut cx))

api/sixtyfps-wasm-interpreter/src/lib.rs

@@ -127,6 +127,6 @@ impl WrappedCompiledComp {
     #[wasm_bindgen]
     pub fn run(&self, canvas_id: String) {
         let component = self.0.clone().create(canvas_id);
-        component.window().run(&vtable::VRc::into_dyn(component));
+        component.window().run();
     }
 }

sixtyfps_compiler/generator/rust.rs

@@ -584,8 +584,7 @@ fn generate_component(
             }
             impl sixtyfps::Component for #component_id {
                 fn run(self: ::core::pin::Pin<&Self>) {
-                    use sixtyfps::re_exports::*;
-                    self.as_ref().window.run(&VRc::into_dyn(self.as_ref().self_weak.get().unwrap().upgrade().unwrap()));
+                    self.as_ref().window.run();
                 }
             }
         ))

sixtyfps_runtime/corelib/eventloop.rs

@@ -22,10 +22,7 @@ use std::{
 };
 use vtable::*;
 
-use crate::{
-    input::{KeyEvent, MouseEventType},
-    properties::PropertyTracker,
-};
+use crate::input::{KeyEvent, MouseEventType};
 #[cfg(not(target_arch = "wasm32"))]
 use winit::platform::desktop::EventLoopExtDesktop;
 
@@ -91,8 +88,6 @@ pub trait GenericWindow {
     fn set_height(&self, height: f32);
     /// Returns the geometry of the window
     fn get_geometry(&self) -> crate::graphics::Rect;
-    /// apply the constraints
-    fn apply_geometry_constraint(&self, constraints: crate::layout::LayoutInfo);
 
     /// This function is called by the generated code when a component and therefore its tree of items are destroyed. The
     /// implementation typically uses this to free the underlying graphics resources cached via [`crate::graphics::RenderingCache`].
@@ -134,12 +129,12 @@ impl ComponentWindow {
         Self(window_impl)
     }
     /// Spins an event loop and renders the items of the provided component in this window.
-    pub fn run(&self, component: &ComponentRc) {
+    pub fn run(&self) {
         let event_loop = crate::eventloop::EventLoop::new();
 
         self.0.clone().map_window(&event_loop);
 
-        event_loop.run(ComponentRc::borrow_pin(component));
+        event_loop.run();
 
         self.0.clone().unmap_window();
     }
@@ -242,10 +237,9 @@ impl EventLoop {
     /// Runs the event loop and renders the items in the provided `component` in its
     /// own window.
     #[allow(unused_mut)] // mut need changes for wasm
-    pub fn run(mut self, component: core::pin::Pin<crate::component::ComponentRef>) {
+    pub fn run(mut self) {
         use winit::event::Event;
         use winit::event_loop::{ControlFlow, EventLoopWindowTarget};
-        let layout_listener = Rc::pin(PropertyTracker::default());
 
         let mut cursor_pos = winit::dpi::PhysicalPosition::new(0., 0.);
         let mut pressed = false;
@@ -265,14 +259,6 @@ impl EventLoop {
                         if let Some(Some(window)) =
                             windows.borrow().get(&id).map(|weakref| weakref.upgrade())
                         {
-                            if layout_listener.as_ref().is_dirty() {
-                                layout_listener.as_ref().evaluate(|| {
-                                    window.apply_geometry_constraint(
-                                        component.as_ref().layout_info(),
-                                    );
-                                    component.as_ref().apply_layout(window.get_geometry())
-                                })
-                            }
                             window.draw();
                         }
                     });
@@ -569,12 +555,9 @@ pub mod ffi {
 
     /// Spins an event loop and renders the items of the provided component in this window.
     #[no_mangle]
-    pub unsafe extern "C" fn sixtyfps_component_window_run(
-        handle: *const ComponentWindowOpaque,
-        component: &ComponentRc,
-    ) {
+    pub unsafe extern "C" fn sixtyfps_component_window_run(handle: *const ComponentWindowOpaque) {
         let window = &*(handle as *const ComponentWindow);
-        window.run(component);
+        window.run();
     }
 
     /// Returns the window scale factor.

sixtyfps_runtime/corelib/graphics.rs

@@ -23,7 +23,7 @@ extern crate alloc;
 use crate::component::{ComponentRc, ComponentWeak};
 use crate::input::{KeyEvent, KeyboardModifiers, MouseEvent, MouseEventType};
 use crate::items::ItemRef;
-use crate::properties::{InterpolatedPropertyValue, Property};
+use crate::properties::{InterpolatedPropertyValue, Property, PropertyTracker};
 #[cfg(feature = "rtti")]
 use crate::rtti::{BuiltinItem, FieldInfo, PropertyInfo, ValueType};
 use crate::SharedArray;
@@ -522,6 +522,7 @@ pub struct GraphicsWindow<Backend: GraphicsBackend + 'static> {
     cursor_blinker: std::cell::RefCell<pin_weak::rc::PinWeak<TextCursorBlinker>>,
     keyboard_modifiers: std::cell::Cell<KeyboardModifiers>,
     component: std::cell::RefCell<ComponentWeak>,
+    layout_listener: Pin<Rc<PropertyTracker>>,
 }
 
 impl<Backend: GraphicsBackend + 'static> GraphicsWindow<Backend> {
@@ -542,6 +543,7 @@ impl<Backend: GraphicsBackend + 'static> GraphicsWindow<Backend> {
             cursor_blinker: Default::default(),
             keyboard_modifiers: Default::default(),
             component: Default::default(),
+            layout_listener: Rc::pin(Default::default()),
         })
     }
 
@@ -549,6 +551,39 @@ impl<Backend: GraphicsBackend + 'static> GraphicsWindow<Backend> {
     pub fn id(&self) -> Option<winit::window::WindowId> {
         Some(self.map_state.borrow().as_mapped().backend.borrow().window().id())
     }
+
+    fn apply_geometry_constraint(&self, constraints: crate::layout::LayoutInfo) {
+        match &*self.map_state.borrow() {
+            GraphicsWindowBackendState::Unmapped => {}
+            GraphicsWindowBackendState::Mapped(window) => {
+                if constraints != window.constraints.get() {
+                    let min_width = constraints.min_width.min(constraints.max_width);
+                    let min_height = constraints.min_height.min(constraints.max_height);
+                    let max_width = constraints.max_width.max(constraints.min_width);
+                    let max_height = constraints.max_height.max(constraints.min_height);
+
+                    window.backend.borrow().window().set_min_inner_size(
+                        if min_width > 0. || min_height > 0. {
+                            Some(winit::dpi::PhysicalSize::new(min_width, min_height))
+                        } else {
+                            None
+                        },
+                    );
+                    window.backend.borrow().window().set_max_inner_size(
+                        if max_width < f32::MAX || max_height < f32::MAX {
+                            Some(winit::dpi::PhysicalSize::new(
+                                max_width.min(65535.),
+                                max_height.min(65535.),
+                            ))
+                        } else {
+                            None
+                        },
+                    );
+                    window.constraints.set(constraints);
+                }
+            }
+        }
+    }
 }
 
 impl<Backend: GraphicsBackend> Drop for GraphicsWindow<Backend> {
@@ -574,6 +609,15 @@ impl<Backend: GraphicsBackend> crate::eventloop::GenericWindow for GraphicsWindo
         let component = self.component.borrow().upgrade().unwrap();
         let component = ComponentRc::borrow_pin(&component);
 
+        {
+            if self.layout_listener.as_ref().is_dirty() {
+                self.layout_listener.as_ref().evaluate(|| {
+                    self.apply_geometry_constraint(component.as_ref().layout_info());
+                    component.as_ref().apply_layout(self.get_geometry())
+                })
+            }
+        }
+
         {
             let map_state = self.map_state.borrow();
             let window = map_state.as_mapped();
@@ -776,39 +820,6 @@ impl<Backend: GraphicsBackend> crate::eventloop::GenericWindow for GraphicsWindo
         )
     }
 
-    fn apply_geometry_constraint(&self, constraints: crate::layout::LayoutInfo) {
-        match &*self.map_state.borrow() {
-            GraphicsWindowBackendState::Unmapped => {}
-            GraphicsWindowBackendState::Mapped(window) => {
-                if constraints != window.constraints.get() {
-                    let min_width = constraints.min_width.min(constraints.max_width);
-                    let min_height = constraints.min_height.min(constraints.max_height);
-                    let max_width = constraints.max_width.max(constraints.min_width);
-                    let max_height = constraints.max_height.max(constraints.min_height);
-
-                    window.backend.borrow().window().set_min_inner_size(
-                        if min_width > 0. || min_height > 0. {
-                            Some(winit::dpi::PhysicalSize::new(min_width, min_height))
-                        } else {
-                            None
-                        },
-                    );
-                    window.backend.borrow().window().set_max_inner_size(
-                        if max_width < f32::MAX || max_height < f32::MAX {
-                            Some(winit::dpi::PhysicalSize::new(
-                                max_width.min(65535.),
-                                max_height.min(65535.),
-                            ))
-                        } else {
-                            None
-                        },
-                    );
-                    window.constraints.set(constraints);
-                }
-            }
-        }
-    }
-
     fn free_graphics_resources(
         self: Rc<Self>,
         component: core::pin::Pin<crate::component::ComponentRef>,

sixtyfps_runtime/interpreter/dynamic_component.rs

@@ -72,7 +72,7 @@ impl<'id> ComponentBox<'id> {
     pub fn run(self) {
         let rc_box = vtable::VRc::new(ErasedComponentBox::from(self));
         let window = rc_box.0.window();
-        window.run(&vtable::VRc::into_dyn(rc_box));
+        window.run();
     }
 }
 

tools/viewer/main.rs

@@ -44,6 +44,6 @@ fn main() -> std::io::Result<()> {
     };
 
     let component = c.create();
-    component.window().run(&vtable::VRc::into_dyn(component));
+    component.window().run();
     Ok(())
 }