Tokio app structure

pulse-ui/src/lib.rs

@@ -1,31 +1,46 @@
+use std::any::Any;
+
+use tokio::sync::mpsc;
+
 pub mod layout;
 pub mod render;
 pub mod unit;
 pub mod widget;
 
+#[derive(Debug, Clone)]
+pub struct Context {
+    tx: mpsc::Sender<Box<dyn Any>>,
+}
+
+pub struct Refresh;
+
 pub trait App {
     // State
-    fn init(&mut self);
-    fn update(&mut self);
-    fn tick(&self);
+    #[allow(async_fn_in_trait)]
+    async fn init(&mut self, ctx: Context);
+    #[allow(async_fn_in_trait)]
+    async fn update(&mut self, event: Box<dyn Any>);
 
     // Rendering
     fn layout(&self) -> layout::Allocation;
     fn render(&mut self, layout: layout::Allocation);
+}
 
-    fn refresh(&mut self) {
-        self.render(self.layout());
-    }
+pub struct AppHandler<A: App> {
+    pub app: A,
+}
 
-    // Running
-    fn run(&mut self) {
-        self.init();
-        self.refresh();
+impl<A: App> AppHandler<A> {
+    pub async fn run(&mut self) {
+        let (tx, mut rx) = mpsc::channel(100);
 
-        loop {
-            self.tick();
-            self.update();
-            self.refresh();
+        self.app.init(Context { tx }).await;
+
+        self.app.render(self.app.layout());
+
+        while let Some(event) = rx.recv().await {
+            self.app.update(event).await;
+            self.app.render(self.app.layout());
         }
     }
 }