Use `subscription::run` for `download_progress` example

1 files changed, 69 insertions, 84 deletions

diff --git a/examples/download_progress/src/download.rs b/examples/download_progress/src/download.rs
index 08805f13..06d5d3fd 100644
--- a/examples/download_progress/src/download.rs
+++ b/examples/download_progress/src/download.rs
@@ -1,112 +1,97 @@
+use futures::Stream;
 use iced_futures::futures;
-use std::hash::{Hash, Hasher};
+use iced_native::subscription;
+
+use std::hash::Hash;
 
 // Just a little utility function
 pub fn file<I: 'static + Hash + Copy + Send, T: ToString>(
     id: I,
     url: T,
 ) -> iced::Subscription<(I, Progress)> {
-    iced::Subscription::from_recipe(Download {
-        id,
-        url: url.to_string(),
-    })
+    subscription::run(
+        Download {
+            id,
+            url: url.to_string(),
+        },
+        download,
+    )
 }
 
+#[derive(Debug, Hash, Clone)]
 pub struct Download<I> {
     id: I,
     url: String,
 }
 
-// Make sure iced can use our download stream
-impl<H, I, T> iced_native::subscription::Recipe<H, I> for Download<T>
-where
-    T: 'static + Hash + Copy + Send,
-    H: Hasher,
-{
-    type Output = (T, Progress);
-
-    fn hash(&self, state: &mut H) {
-        struct Marker;
-        std::any::TypeId::of::<Marker>().hash(state);
-
-        self.id.hash(state);
-    }
-
-    fn stream(
-        self: Box<Self>,
-        _input: futures::stream::BoxStream<'static, I>,
-    ) -> futures::stream::BoxStream<'static, Self::Output> {
-        let id = self.id;
+fn download<I: Copy>(
+    download: Download<I>,
+) -> impl Stream<Item = (I, Progress)> {
+    let id = download.id;
 
-        Box::pin(futures::stream::unfold(
-            State::Ready(self.url),
-            move |state| async move {
-                match state {
-                    State::Ready(url) => {
-                        let response = reqwest::get(&url).await;
+    futures::stream::unfold(
+        State::Ready(download.url),
+        move |state| async move {
+            match state {
+                State::Ready(url) => {
+                    let response = reqwest::get(&url).await;
 
-                        match response {
-                            Ok(response) => {
-                                if let Some(total) = response.content_length() {
-                                    Some((
-                                        (id, Progress::Started),
-                                        State::Downloading {
-                                            response,
-                                            total,
-                                            downloaded: 0,
-                                        },
-                                    ))
-                                } else {
-                                    Some((
-                                        (id, Progress::Errored),
-                                        State::Finished,
-                                    ))
-                                }
-                            }
-                            Err(_) => {
+                    match response {
+                        Ok(response) => {
+                            if let Some(total) = response.content_length() {
+                                Some((
+                                    (id, Progress::Started),
+                                    State::Downloading {
+                                        response,
+                                        total,
+                                        downloaded: 0,
+                                    },
+                                ))
+                            } else {
                                 Some(((id, Progress::Errored), State::Finished))
                             }
                         }
-                    }
-                    State::Downloading {
-                        mut response,
-                        total,
-                        downloaded,
-                    } => match response.chunk().await {
-                        Ok(Some(chunk)) => {
-                            let downloaded = downloaded + chunk.len() as u64;
-
-                            let percentage =
-                                (downloaded as f32 / total as f32) * 100.0;
-
-                            Some((
-                                (id, Progress::Advanced(percentage)),
-                                State::Downloading {
-                                    response,
-                                    total,
-                                    downloaded,
-                                },
-                            ))
-                        }
-                        Ok(None) => {
-                            Some(((id, Progress::Finished), State::Finished))
-                        }
                         Err(_) => {
                             Some(((id, Progress::Errored), State::Finished))
                         }
-                    },
-                    State::Finished => {
-                        // We do not let the stream die, as it would start a
-                        // new download repeatedly if the user is not careful
-                        // in case of errors.
-                        let _: () = iced::futures::future::pending().await;
+                    }
+                }
+                State::Downloading {
+                    mut response,
+                    total,
+                    downloaded,
+                } => match response.chunk().await {
+                    Ok(Some(chunk)) => {
+                        let downloaded = downloaded + chunk.len() as u64;
 
-                        None
+                        let percentage =
+                            (downloaded as f32 / total as f32) * 100.0;
+
+                        Some((
+                            (id, Progress::Advanced(percentage)),
+                            State::Downloading {
+                                response,
+                                total,
+                                downloaded,
+                            },
+                        ))
+                    }
+                    Ok(None) => {
+                        Some(((id, Progress::Finished), State::Finished))
                     }
+                    Err(_) => Some(((id, Progress::Errored), State::Finished)),
+                },
+                State::Finished => {
+                    // We do not let the stream die, as it would start a
+                    // new download repeatedly if the user is not careful
+                    // in case of errors.
+                    let _: () = iced::futures::future::pending().await;
+
+                    None
                 }
-            },
-        ))
-    }
+            }
+        },
+    )
 }
 
 #[derive(Debug, Clone)]