Allow switching executor::Default with features

Cargo.toml

@@ -12,12 +12,16 @@ keywords = ["gui", "ui", "graphics", "interface", "widgets"]
 categories = ["gui"]
 
 [features]
-# Enables the Image widget
+# Enables the `Image` widget
 image = ["iced_wgpu/image"]
-# Enables the Svg widget
+# Enables the `Svg` widget
 svg = ["iced_wgpu/svg"]
 # Enables a debug view in native platforms (press F12)
 debug = ["iced_winit/debug"]
+# Enables `tokio` as the `executor::Default` on native platforms
+tokio = ["iced_futures/tokio"]
+# Enables `async-std` as the `executor::Default` on native platforms
+async-std = ["iced_futures/async-std"]
 
 [badges]
 maintenance = { status = "actively-developed" }
@@ -45,6 +49,9 @@ members = [
     "examples/tour",
 ]
 
+[dependencies]
+iced_futures = { version = "0.1.0-alpha", path = "futures" }
+
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 iced_winit = { version = "0.1.0-alpha", path = "winit" }
 iced_wgpu = { version = "0.1.0", path = "wgpu" }

examples/pokedex/Cargo.toml

@@ -6,8 +6,7 @@ edition = "2018"
 publish = false
 
 [dependencies]
-iced = { path = "../..", features = ["image", "debug"] }
+iced = { path = "../..", features = ["image", "debug", "tokio"] }
-iced_futures = { path = "../../futures", features = ["tokio"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 rand = { version = "0.7", features = ["wasm-bindgen"] }

examples/pokedex/src/main.rs

@@ -27,12 +27,7 @@ enum Message {
 }
 
 impl Application for Pokedex {
-    #[cfg(not(target_arch = "wasm32"))]
+    type Executor = iced::executor::Default;
-    type Executor = iced_futures::executor::Tokio;
-
-    #[cfg(target_arch = "wasm32")]
-    type Executor = iced_futures::executor::WasmBindgen;
-
     type Message = Message;
 
     fn new() -> (Pokedex, Command<Message>) {

examples/todos/Cargo.toml

@@ -6,8 +6,7 @@ edition = "2018"
 publish = false
 
 [dependencies]
-iced = { path = "../.." }
+iced = { path = "../..", features = ["async-std"] }
-iced_futures = { path = "../../futures", features = ["async-std"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 

examples/todos/src/main.rs

@@ -38,12 +38,7 @@ enum Message {
 }
 
 impl Application for Todos {
-    #[cfg(not(target_arch = "wasm32"))]
+    type Executor = iced::executor::Default;
-    type Executor = iced_futures::executor::AsyncStd;
-
-    #[cfg(target_arch = "wasm32")]
-    type Executor = iced_futures::executor::WasmBindgen;
-
     type Message = Message;
 
     fn new() -> (Todos, Command<Message>) {

src/executor.rs

@@ -5,38 +5,49 @@ pub use platform::Default;
 
 #[cfg(not(target_arch = "wasm32"))]
 mod platform {
-    use iced_winit::{executor::ThreadPool, futures, Executor};
+    use iced_futures::{executor, futures};
+
+    #[cfg(feature = "tokio")]
+    type Executor = executor::Tokio;
+
+    #[cfg(all(not(feature = "tokio"), feature = "async-std"))]
+    type Executor = executor::AsyncStd;
+
+    #[cfg(not(any(feature = "tokio", feature = "async-std")))]
+    type Executor = executor::ThreadPool;
 
     /// A default cross-platform executor.
     ///
-    /// - On native platforms, it will use a
+    /// - On native platforms, it will use:
-    ///   `iced_futures::executor::ThreadPool`.
+    ///   - `iced_futures::executor::Tokio` when the `tokio` feature is enabled.
+    ///   - `iced_futures::executor::AsyncStd` when the `async-std` feature is
+    ///     enabled.
+    ///   - `iced_futures::executor::ThreadPool` otherwise.
     /// - On the Web, it will use `iced_futures::executor::WasmBindgen`.
     #[derive(Debug)]
-    pub struct Default(ThreadPool);
+    pub struct Default(Executor);
 
-    impl Executor for Default {
+    impl super::Executor for Default {
         fn new() -> Result<Self, futures::io::Error> {
-            Ok(Default(ThreadPool::new()?))
+            Ok(Default(Executor::new()?))
         }
 
         fn spawn(
             &self,
             future: impl futures::Future<Output = ()> + Send + 'static,
         ) {
-            self.0.spawn(future);
+            let _ = self.0.spawn(future);
         }
     }
 }
 
 #[cfg(target_arch = "wasm32")]
 mod platform {
-    use iced_web::{executor::WasmBindgen, futures, Executor};
+    use iced_futures::{executor::WasmBindgen, futures, Executor};
 
     /// A default cross-platform executor.
     ///
-    /// - On native platforms, it will use a
+    /// - On native platforms, it will use `iced_futures::executor::ThreadPool`.
-    ///   `iced_futures::executor::ThreadPool`.
     /// - On the Web, it will use `iced_futures::executor::WasmBindgen`.
     #[derive(Debug)]
     pub struct Default(WasmBindgen);