Tokio app structure

Cargo.lock

@@ -2,6 +2,12 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "pin-project-lite"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a89322df9ebe1c1578d689c92318e070967d1042b512afbe49518723f4e6d5cd"
+
 [[package]]
 name = "pulse-trader"
 version = "0.1.0-alpha.0"
@@ -12,3 +18,15 @@ dependencies = [
 [[package]]
 name = "pulse-ui"
 version = "0.1.0"
+dependencies = [
+ "tokio",
+]
+
+[[package]]
+name = "tokio"
+version = "1.52.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8fc7f01b389ac15039e4dc9531aa973a135d7a4135281b12d7c1bc79fd57fffe"
+dependencies = [
+ "pin-project-lite",
+]

pulse-ui/Cargo.toml

@@ -4,3 +4,4 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+tokio = { version = "1.52.3", features = ["sync"] }

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());
         }
     }
 }