Testing new structure

examples/hello_world.rs

@@ -1,11 +1,16 @@
-use osui::{Context, Node};
+use osui::{Context, Event, Node};
+
+pub struct ClickEvent;
+
+impl Event for ClickEvent {
+    fn as_any(&self) -> &dyn std::any::Any {
+        self
+    }
+}
 
 fn app(cx: &mut Context) -> Node {
     // Hooks
-    // Event handlers
-    // cx.event(|e: &ClickEvent| {
-        
-    // });
+    cx.event(|_: &ClickEvent| {});
 
     Box::new(|renderer| {
         renderer.draw_text("Hello, World!", 0, 0).unwrap();

src/lib.rs

@@ -1,3 +1,5 @@
+use std::any::Any;
+
 use crate::renderer::{OsuiRenderer, Renderer};
 
 pub mod error;
@@ -8,7 +10,13 @@ pub use error::Result;
 pub type Node = Box<dyn Fn(&mut dyn Renderer)>;
 pub type Component = Box<dyn Fn(&mut Context) -> Node>;
 
-pub struct Context {}
+pub trait Event {
+    fn as_any(&self) -> &dyn Any;
+}
+
+pub struct Context {
+    event_handlers: Vec<Box<dyn Fn(&dyn Event)>>,
+}
 
 pub struct Osui {
     node: Node,
@@ -17,14 +25,18 @@ pub struct Osui {
 
 impl Osui {
     pub fn new(component: Component) -> Self {
-        let mut cx = Context {};
+        let mut cx = Context {
+            event_handlers: Vec::new(),
+        };
         Osui {
             node: component(&mut cx),
             renderer: None,
         }
     }
     pub fn with_renderer(component: Component, renderer: Box<dyn Renderer>) -> Self {
-        let mut cx = Context {};
+        let mut cx = Context {
+            event_handlers: Vec::new(),
+        };
         Osui {
             node: component(&mut cx),
             renderer: Some(renderer),
@@ -41,3 +53,21 @@ impl Osui {
         Ok(())
     }
 }
+
+impl Context {
+    pub fn event<E: Event + 'static, F: Fn(&E) + 'static>(&mut self, handler: F) {
+        self.event_handlers.push(Box::new(move |e| {
+            if let Some(e) = e.as_any().downcast_ref() {
+                (handler)(e)
+            }
+        }));
+    }
+
+    pub fn global_event<E: Event + 'static, F: Fn(&E) + 'static>(&mut self, handler: F) {
+        self.event_handlers.push(Box::new(move |e| {
+            if let Some(e) = e.as_any().downcast_ref() {
+                (handler)(e)
+            }
+        }));
+    }
+}