Make iced_native subscription input opaque

examples/stopwatch.rs

@@ -155,13 +155,13 @@ mod time {
 
     struct Every(std::time::Duration);
 
-    impl<Hasher, Input> iced_native::subscription::Recipe<Hasher, Input> for Every
+    impl<H, I> iced_native::subscription::Recipe<H, I> for Every
     where
-        Hasher: std::hash::Hasher,
+        H: std::hash::Hasher,
     {
         type Output = std::time::Instant;
 
-        fn hash(&self, state: &mut Hasher) {
+        fn hash(&self, state: &mut H) {
             use std::hash::Hash;
 
             std::any::TypeId::of::<Self>().hash(state);
@@ -170,7 +170,7 @@ mod time {
 
         fn stream(
             self: Box<Self>,
-            _input: Input,
+            _input: I,
         ) -> futures::stream::BoxStream<'static, Self::Output> {
             use futures::stream::StreamExt;
 

native/src/subscription.rs

@@ -1,31 +1,16 @@
 use crate::{Event, Hasher};
+use futures::stream::BoxStream;
 
-pub type Subscription<T> = iced_core::Subscription<Hasher, Input, T>;
-pub type Input = futures::channel::mpsc::Receiver<Event>;
+pub type EventStream = BoxStream<'static, Event>;
+
+pub type Subscription<T> = iced_core::Subscription<Hasher, EventStream, T>;
 
 pub use iced_core::subscription::Recipe;
 
+mod events;
+
+use events::Events;
+
 pub fn events() -> Subscription<Event> {
     Subscription::from_recipe(Events)
 }
-
-struct Events;
-
-impl Recipe<Hasher, Input> for Events {
-    type Output = Event;
-
-    fn hash(&self, state: &mut Hasher) {
-        use std::hash::Hash;
-
-        std::any::TypeId::of::<Self>().hash(state);
-    }
-
-    fn stream(
-        self: Box<Self>,
-        input: Input,
-    ) -> futures::stream::BoxStream<'static, Self::Output> {
-        use futures::StreamExt;
-
-        input.boxed()
-    }
-}

native/src/subscription/events.rs

@@ -0,0 +1,23 @@
+use crate::{
+    subscription::{EventStream, Recipe},
+    Event, Hasher,
+};
+
+pub struct Events;
+
+impl Recipe<Hasher, EventStream> for Events {
+    type Output = Event;
+
+    fn hash(&self, state: &mut Hasher) {
+        use std::hash::Hash;
+
+        std::any::TypeId::of::<Self>().hash(state);
+    }
+
+    fn stream(
+        self: Box<Self>,
+        event_stream: EventStream,
+    ) -> futures::stream::BoxStream<'static, Self::Output> {
+        event_stream
+    }
+}

winit/src/application.rs

@@ -468,7 +468,7 @@ impl Subscriptions {
                 let (event_sender, event_receiver) =
                     futures::channel::mpsc::channel(100);
 
-                let stream = recipe.stream(event_receiver);
+                let stream = recipe.stream(event_receiver.boxed());
                 let proxy = proxy.clone();
 
                 let future = futures::future::select(