Implement iced::Sandbox trait for simple apps

src/application.rs

@@ -0,0 +1,69 @@
+use crate::{Command, Element};
+
+pub trait Application: Sized {
+    type Message: std::fmt::Debug + Send;
+
+    fn new() -> (Self, Command<Self::Message>);
+
+    fn title(&self) -> String;
+
+    fn update(&mut self, message: Self::Message) -> Command<Self::Message>;
+
+    fn view(&mut self) -> Element<Self::Message>;
+
+    fn run()
+    where
+        Self: 'static + Sized,
+    {
+        #[cfg(not(target_arch = "wasm32"))]
+        <Instance<Self> as iced_winit::Application>::run();
+
+        #[cfg(target_arch = "wasm32")]
+        iced_web::Application::run(Instance(self));
+    }
+}
+
+struct Instance<A: Application>(A);
+
+#[cfg(not(target_arch = "wasm32"))]
+impl<A> iced_winit::Application for Instance<A>
+where
+    A: Application,
+{
+    type Renderer = iced_wgpu::Renderer;
+    type Message = A::Message;
+
+    fn new() -> (Self, Command<A::Message>) {
+        let (app, command) = A::new();
+
+        (Instance(app), command)
+    }
+
+    fn title(&self) -> String {
+        self.0.title()
+    }
+
+    fn update(&mut self, message: Self::Message) -> Command<Self::Message> {
+        self.0.update(message)
+    }
+
+    fn view(&mut self) -> Element<Self::Message> {
+        self.0.view()
+    }
+}
+
+#[cfg(target_arch = "wasm32")]
+impl<A> iced_web::Application for Instance<A>
+where
+    A: Application,
+{
+    type Message = A::Message;
+
+    fn update(&mut self, message: Self::Message) {
+        self.0.update(message);
+    }
+
+    fn view(&mut self) -> Element<Self::Message> {
+        self.0.view()
+    }
+}