diff --git a/examples/hello_world.rs b/examples/hello_world.rs
index 5ebf3d8..a15a528 100644
--- a/examples/hello_world.rs
+++ b/examples/hello_world.rs
@@ -2,13 +2,24 @@ use std::sync::Arc;
 
 use osui::prelude::*;
 
+pub struct KeyPress;
+
+impl Event for KeyPress {
+    fn as_any(&self) -> &dyn std::any::Any {
+        self
+    }
+}
+
 fn main() {
-    let mut cx = Context::new(app);
+    let cx = Context::new(app);
     cx.refresh();
 
     std::thread::spawn({
         let cx = cx.clone();
-        move || {}
+        move || loop {
+            crossterm::event::read().unwrap();
+            cx.event(&KeyPress);
+        }
     });
 
     loop {
@@ -20,5 +31,12 @@ fn main() {
 fn app(cx: &Arc<Context>) -> Vec<Node> {
     let count = use_state(0);
 
+    cx.on_event({
+        let count = count.clone();
+        move |_cx, _event: &KeyPress| {
+            *count.get() += 1;
+        }
+    });
+
     vec![Node::String(Arc::new(move || format!("{count}")))]
 }
diff --git a/src/component.rs b/src/component.rs
index 9134446..a7e30af 100644
--- a/src/component.rs
+++ b/src/component.rs
@@ -1,19 +1,38 @@
-use std::sync::{Arc, Mutex};
+use std::{
+    any::{Any, TypeId},
+    collections::HashMap,
+    sync::{Arc, Mutex},
+};
 
 use crate::Node;
 
-pub type Component = Arc<dyn Fn(&Arc<Context>) -> Vec<Node>>;
+pub trait Event {
+    fn as_any(&self) -> &dyn Any;
+}
+
+impl<'a> dyn Event + 'a {
+    pub fn get<T: Event + 'static>(&self) -> Option<&T> {
+        self.as_any().downcast_ref()
+    }
+}
+
+pub type Component = Arc<dyn Fn(&Arc<Context>) -> Vec<Node> + Send + Sync>;
+pub type EventHandler = Arc<Mutex<dyn FnMut(&Arc<Context>, &dyn Event) + Send + Sync>>;
 
 pub struct Context {
     component: Mutex<Component>,
     nodes: Mutex<Vec<Node>>,
+    event_handlers: Mutex<HashMap<TypeId, Vec<EventHandler>>>,
 }
 
 impl Context {
-    pub fn new<F: Fn(&Arc<Context>) -> Vec<Node> + 'static>(component: F) -> Arc<Self> {
+    pub fn new<F: Fn(&Arc<Context>) -> Vec<Node> + Send + Sync + 'static>(
+        component: F,
+    ) -> Arc<Self> {
         Arc::new(Self {
             component: Mutex::new(Arc::new(component)),
             nodes: Mutex::new(Vec::new()),
+            event_handlers: Mutex::new(HashMap::new()),
         })
     }
 
@@ -25,4 +44,30 @@ impl Context {
     pub fn get_nodes(self: &Arc<Context>) -> Vec<Node> {
         self.nodes.lock().unwrap().clone()
     }
+
+    pub fn on_event<T: Event + 'static, F: Fn(&Arc<Context>, &T) + Send + Sync + 'static>(
+        self: &Arc<Context>,
+        handler: F,
+    ) {
+        self.event_handlers
+            .lock()
+            .unwrap()
+            .entry(TypeId::of::<T>())
+            .or_insert_with(|| Vec::new())
+            .push(Arc::new(Mutex::new(
+                move |ctx: &Arc<Context>, event: &dyn Event| {
+                    if let Some(e) = event.get::<T>() {
+                        (handler)(ctx, e);
+                    }
+                },
+            )));
+    }
+
+    pub fn event<E: Event + 'static>(self: &Arc<Context>, event: &E) {
+        if let Some(v) = self.event_handlers.lock().unwrap().get(&TypeId::of::<E>()) {
+            for i in v {
+                (i.lock().unwrap())(&self.clone(), event);
+            }
+        }
+    }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 0384e0f..357c3ac 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,7 +11,7 @@ pub mod prelude {
 
 #[derive(Clone)]
 pub enum Node {
-    String(Arc<dyn Fn() -> String>),
+    String(Arc<dyn Fn() -> String + Send + Sync>),
     Component(component::Component),
 }