diff --git a/core/src/data.rs b/core/src/data.rs
deleted file mode 100644
index 3c85abc..0000000
--- a/core/src/data.rs
+++ /dev/null
@@ -1,27 +0,0 @@
-use std::any::{Any, TypeId};
-
-use crate::util::{HashMap, Id};
-
-#[derive(Default)]
-pub struct UiData {
-    map: HashMap<TypeId, Box<dyn Any>>,
-}
-
-impl UiData {
-    pub fn get<T: 'static>(&self) -> Option<&T> {
-        self.map
-            .get(&TypeId::of::<T>())
-            .map(|d| d.downcast_ref().unwrap())
-    }
-    pub fn get_mut<T: 'static>(&mut self) -> Option<&mut T> {
-        self.map
-            .get_mut(&TypeId::of::<T>())
-            .map(|d| d.downcast_mut().unwrap())
-    }
-
-    pub fn emit_remove(&mut self, id: &Id) {
-        for (tid, f) in &mut self.on_remove {
-            let data = self.map.get_mut(tid).unwrap().downcast_ref().unwrap();
-        }
-    }
-}
diff --git a/core/src/event/ctx.rs b/core/src/event/ctx.rs
new file mode 100644
index 0000000..fb10503
--- /dev/null
+++ b/core/src/event/ctx.rs
@@ -0,0 +1,36 @@
+use std::ops::{Index, IndexMut};
+
+use crate::{Ui, Widget, WidgetRef};
+
+pub struct EventCtx<'a, Ctx, Data> {
+    pub ui: &'a mut Ui,
+    pub state: &'a mut Ctx,
+    pub data: &'a mut Data,
+}
+
+pub struct EventIdCtx<'a, Ctx, Data, W: ?Sized> {
+    pub widget: WidgetRef<W>,
+    pub ui: &'a mut Ui,
+    pub state: &'a mut Ctx,
+    pub data: &'a mut Data,
+}
+
+impl<'a, Ctx, Data, W2, W: Widget> Index<WidgetRef<W>> for EventIdCtx<'a, Ctx, Data, W2> {
+    type Output = W;
+
+    fn index(&self, index: WidgetRef<W>) -> &Self::Output {
+        &self.ui[index]
+    }
+}
+
+impl<'a, Ctx, Data, W2, W: Widget> IndexMut<WidgetRef<W>> for EventIdCtx<'a, Ctx, Data, W2> {
+    fn index_mut(&mut self, index: WidgetRef<W>) -> &mut Self::Output {
+        &mut self.ui[index]
+    }
+}
+
+impl<'a, Ctx, Data, W: Widget> EventIdCtx<'a, Ctx, Data, W> {
+    pub fn widget(&mut self) -> &mut W {
+        &mut self.ui[self.widget]
+    }
+}
diff --git a/core/src/event.rs b/core/src/event/manager.rs
similarity index 69%
rename from core/src/event.rs
rename to core/src/event/manager.rs
index a3b38cc..aa98b23 100644
--- a/core/src/event.rs
+++ b/core/src/event/manager.rs
@@ -1,47 +1,12 @@
 use crate::{
-    ActiveData, IdLike, LayerId, Ui, Widget, WidgetData, WidgetId, WidgetRef, util::HashMap,
+    ActiveData, Event, EventCtx, EventFn, EventLike, IdLike, LayerId, Ui, WidgetData, WidgetId,
+    util::HashMap,
 };
 use std::{
     any::{Any, TypeId},
-    ops::{Index, IndexMut},
     rc::Rc,
 };
 
-pub trait Event: Sized + 'static + Clone {
-    type Data<'a> = ();
-    type State: Default = ();
-    #[allow(unused_variables)]
-    fn should_run(&self, data: &mut Self::Data<'_>) -> bool {
-        true
-    }
-}
-
-pub trait EventLike {
-    type Event: Event;
-    fn into_event(self) -> Self::Event;
-}
-
-impl<E: Event> EventLike for E {
-    type Event = Self;
-
-    fn into_event(self) -> Self::Event {
-        self
-    }
-}
-
-pub struct EventCtx<'a, Ctx, Data> {
-    pub ui: &'a mut Ui,
-    pub state: &'a mut Ctx,
-    pub data: &'a mut Data,
-}
-
-pub struct EventIdCtx<'a, Ctx, Data, W: ?Sized> {
-    pub widget: WidgetRef<W>,
-    pub ui: &'a mut Ui,
-    pub state: &'a mut Ctx,
-    pub data: &'a mut Data,
-}
-
 #[derive(Default)]
 pub struct EventManager {
     types: HashMap<TypeId, Box<dyn EventManagerLike>>,
@@ -150,7 +115,7 @@ impl<E: Event, Ctx: 'static> TypeEventManager<E, Ctx> {
             .push((event, Rc::new(f)));
     }
 
-    fn run_fn<'a>(
+    pub fn run_fn<'a>(
         &mut self,
         id: impl IdLike,
     ) -> impl for<'b> FnOnce(EventCtx<Ctx, E::Data<'b>>) + 'a {
@@ -169,35 +134,6 @@ impl<E: Event, Ctx: 'static> TypeEventManager<E, Ctx> {
     }
 }
 
-impl<'a, Ctx, Data, W2, W: Widget> Index<WidgetRef<W>> for EventIdCtx<'a, Ctx, Data, W2> {
-    type Output = W;
-
-    fn index(&self, index: WidgetRef<W>) -> &Self::Output {
-        &self.ui[index]
-    }
-}
-
-impl<'a, Ctx, Data, W2, W: Widget> IndexMut<WidgetRef<W>> for EventIdCtx<'a, Ctx, Data, W2> {
-    fn index_mut(&mut self, index: WidgetRef<W>) -> &mut Self::Output {
-        &mut self.ui[index]
-    }
-}
-
-impl<'a, Ctx, Data, W: Widget> EventIdCtx<'a, Ctx, Data, W> {
-    pub fn widget(&mut self) -> &mut W {
-        &mut self.ui[self.widget]
-    }
-}
-
-pub trait EventFn<Ctx, Data>: Fn(EventCtx<Ctx, Data>) + 'static {}
-impl<F: Fn(EventCtx<Ctx, Data>) + 'static, Ctx, Data> EventFn<Ctx, Data> for F {}
-
-pub trait WidgetEventFn<Ctx, Data, W: ?Sized>: Fn(EventIdCtx<Ctx, Data, W>) + 'static {}
-impl<F: Fn(EventIdCtx<Ctx, Data, W>) + 'static, Ctx, Data, W: ?Sized> WidgetEventFn<Ctx, Data, W>
-    for F
-{
-}
-
 impl Ui {
     pub fn run_event<E: EventLike, Ctx: 'static>(
         &mut self,
diff --git a/core/src/event/mod.rs b/core/src/event/mod.rs
new file mode 100644
index 0000000..c673159
--- /dev/null
+++ b/core/src/event/mod.rs
@@ -0,0 +1,36 @@
+mod ctx;
+mod manager;
+
+pub use ctx::*;
+pub use manager::*;
+
+pub trait Event: Sized + 'static + Clone {
+    type Data<'a> = ();
+    type State: Default = ();
+    #[allow(unused_variables)]
+    fn should_run(&self, data: &mut Self::Data<'_>) -> bool {
+        true
+    }
+}
+
+pub trait EventLike {
+    type Event: Event;
+    fn into_event(self) -> Self::Event;
+}
+
+impl<E: Event> EventLike for E {
+    type Event = Self;
+
+    fn into_event(self) -> Self::Event {
+        self
+    }
+}
+
+pub trait EventFn<Ctx, Data>: Fn(EventCtx<Ctx, Data>) + 'static {}
+impl<F: Fn(EventCtx<Ctx, Data>) + 'static, Ctx, Data> EventFn<Ctx, Data> for F {}
+
+pub trait WidgetEventFn<Ctx, Data, W: ?Sized>: Fn(EventIdCtx<Ctx, Data, W>) + 'static {}
+impl<F: Fn(EventIdCtx<Ctx, Data, W>) + 'static, Ctx, Data, W: ?Sized> WidgetEventFn<Ctx, Data, W>
+    for F
+{
+}