Draft web runtime and widgets

web/src/lib.rs

@@ -1 +1,28 @@
+use futures::Future;
 
+mod color;
+mod element;
+mod widget;
+
+pub use color::Color;
+pub use element::Element;
+pub use iced::Align;
+pub use widget::*;
+
+pub trait UserInterface {
+    type Message;
+
+    fn update(
+        &mut self,
+        message: Self::Message,
+    ) -> Box<dyn Future<Item = Self::Message, Error = ()>>;
+
+    fn view(&mut self) -> Element<Self::Message>;
+
+    fn run(mut self)
+    where
+        Self: Sized,
+    {
+        let element = self.view();
+    }
+}