Merge pull request #17 from hecrj/web

Basic web support (core, native, and web crates)

1 files changed, 74 insertions, 0 deletions

diff --git a/web/src/lib.rs b/web/src/lib.rs
new file mode 100644
index 00000000..caf17df5
--- /dev/null
+++ b/web/src/lib.rs
@@ -0,0 +1,74 @@
+use dodrio::bumpalo;
+use futures::Future;
+use std::cell::RefCell;
+
+mod bus;
+mod element;
+pub mod widget;
+
+pub use bus::Bus;
+pub use element::Element;
+pub use iced_core::{Align, Color, Justify, Length};
+pub use widget::*;
+
+pub trait UserInterface {
+    type Message;
+
+    fn update(
+        &mut self,
+        message: Self::Message,
+    ) -> Option<Box<dyn Future<Output = Self::Message>>>;
+
+    fn view(&mut self) -> Element<Self::Message>;
+
+    fn run(self)
+    where
+        Self: 'static + Sized,
+    {
+        let window = web_sys::window().unwrap();
+        let document = window.document().unwrap();
+        let body = document.body().unwrap();
+
+        let app = Application::new(self);
+
+        let vdom = dodrio::Vdom::new(&body, app);
+        vdom.forget();
+    }
+}
+
+struct Application<Message> {
+    ui: RefCell<Box<dyn UserInterface<Message = Message>>>,
+}
+
+impl<Message> Application<Message> {
+    fn new(ui: impl UserInterface<Message = Message> + 'static) -> Self {
+        Self {
+            ui: RefCell::new(Box::new(ui)),
+        }
+    }
+
+    fn update(&mut self, message: Message) {
+        let mut ui = self.ui.borrow_mut();
+
+        // TODO: Resolve futures and publish resulting messages
+        let _ = ui.update(message);
+    }
+}
+
+impl<Message> dodrio::Render for Application<Message>
+where
+    Message: 'static,
+{
+    fn render<'a, 'bump>(
+        &'a self,
+        bump: &'bump bumpalo::Bump,
+    ) -> dodrio::Node<'bump>
+    where
+        'a: 'bump,
+    {
+        let mut ui = self.ui.borrow_mut();
+        let element = ui.view();
+
+        element.widget.node(bump, &Bus::new())
+    }
+}