diff --git a/examples/src/cube_camera/main.rs b/examples/src/cube_camera/main.rs
index f0bcf96..ecb8d6c 100644
--- a/examples/src/cube_camera/main.rs
+++ b/examples/src/cube_camera/main.rs
@@ -8,22 +8,31 @@ use sursface::wgpu;
 use wgpu::{util::DeviceExt, Color, RenderPipeline};
 use sursface::cgmath::{Deg, Matrix4, Point3, Vector3, perspective};
 use sursface::cgmath::SquareMatrix;
+use sursface::{app::AppHandlers, winit::dpi::PhysicalSize};
 
 #[cfg(target_arch = "wasm32")]
 use sursface::wasm_bindgen;
 
 #[cfg(not(target_arch = "wasm32"))]
 fn main() {
-    use sursface::winit::dpi::PhysicalSize;
-    sursface::start::create_window_desktop(PhysicalSize::new(1280, 720), &init, &render, &event);
+    sursface::start::create_window_desktop(PhysicalSize::new(1280, 720), AppHandlers {
+        init,
+        render,
+        event,
+        ..Default::default()
+    });
 }
 
 
 #[cfg(target_arch = "wasm32")]
 #[wasm_bindgen::prelude::wasm_bindgen]
 pub fn start_browser(canvas: sursface::wgpu::web_sys::HtmlCanvasElement) {
-    use sursface::start;
-    start::create_window_browser(canvas, &init, &render, &event);
+    sursface::start::create_window_browser(canvas, AppHandlers {
+        init,
+        render,
+        event,
+        ..Default::default()
+    });
 }
 
 #[cfg(target_arch = "wasm32")]
diff --git a/examples/src/hello_triangle/main.rs b/examples/src/hello_triangle/main.rs
index 414cb2c..012475d 100644
--- a/examples/src/hello_triangle/main.rs
+++ b/examples/src/hello_triangle/main.rs
@@ -1,9 +1,14 @@
 use sursface::{display::Display, std::{clear_screen, create_render_pipeline, create_shader, get_framebuffer}, wgpu::{self, Color, RenderPipeline}, winit::event::WindowEvent};
+use sursface::{app::AppHandlers, winit::dpi::PhysicalSize};
 
 #[cfg(not(target_arch = "wasm32"))]
 fn main() {
-    use sursface::winit::dpi::PhysicalSize;
-    sursface::start::create_window_desktop(PhysicalSize::new(1280, 720), &init, &render, &event);
+    sursface::start::create_window_desktop(PhysicalSize::new(1280, 720), AppHandlers {
+        init,
+        render,
+        event,
+        ..Default::default()
+    });
 }
 
 #[cfg(target_arch = "wasm32")]
@@ -13,9 +18,12 @@ fn main() {}
 #[cfg(target_arch = "wasm32")]
 #[wasm_bindgen::prelude::wasm_bindgen]
 pub fn start_browser(canvas: sursface::wgpu::web_sys::HtmlCanvasElement) {
-    use sursface::start;
-
-    start::create_window_browser(canvas, &init, &render, &event);
+    sursface::start::create_window_browser(canvas, AppHandlers {
+        init,
+        render,
+        event,
+        ..Default::default()
+    });
 }
 
 struct TriangleState {
diff --git a/examples/src/hello_window/main.rs b/examples/src/hello_window/main.rs
index 352baba..09e7cd2 100644
--- a/examples/src/hello_window/main.rs
+++ b/examples/src/hello_window/main.rs
@@ -1,18 +1,28 @@
 use sursface::{display::Display, wgpu::{self, TextureView}, winit::event::WindowEvent};
+use sursface::{app::AppHandlers, winit::dpi::PhysicalSize};
+
 #[cfg(target_arch = "wasm32")]
 use sursface::wasm_bindgen;
 
 #[cfg(not(target_arch = "wasm32"))]
 fn main() {
-    use sursface::winit::dpi::PhysicalSize;
-    sursface::start::create_window_desktop(PhysicalSize::new(1280, 720), &init, &render, &event);
+    sursface::start::create_window_desktop(PhysicalSize::new(1280, 720),AppHandlers {
+        init,
+        render,
+        event,
+        ..Default::default()
+    });
 }
 
 #[cfg(target_arch = "wasm32")]
 #[wasm_bindgen::prelude::wasm_bindgen]
 pub fn start_browser(canvas: sursface::wgpu::web_sys::HtmlCanvasElement) {
-    use sursface::start;
-    start::create_window_browser(canvas, &init, &render, &event);
+    sursface::start::create_window_browser(canvas, AppHandlers {
+        init,
+        render,
+        event,
+        ..Default::default()
+    });
 }
 
 #[cfg(target_arch = "wasm32")]
diff --git a/examples/src/mandelbrot/main.rs b/examples/src/mandelbrot/main.rs
index 7825b82..ee7585c 100644
--- a/examples/src/mandelbrot/main.rs
+++ b/examples/src/mandelbrot/main.rs
@@ -10,22 +10,31 @@ use sursface::{log, wgpu};
 use sursface::cgmath::{Vector2, Zero};
 use bytemuck::{Pod,Zeroable};
 use std::fmt::Display as FmtDisplay;
+use sursface::{app::AppHandlers, winit::dpi::PhysicalSize};
 
 #[cfg(target_arch = "wasm32")]
 use sursface::wasm_bindgen;
 
 #[cfg(not(target_arch = "wasm32"))]
 fn main() {
-    use sursface::winit::dpi::PhysicalSize;
-    sursface::start::create_window_desktop(PhysicalSize::new(720, 720), &init, &render, &event);
+    sursface::start::create_window_desktop(PhysicalSize::new(720, 720), AppHandlers {
+        init,
+        render,
+        event,
+        ..Default::default()
+    });
 }
 
 
 #[cfg(target_arch = "wasm32")]
 #[wasm_bindgen::prelude::wasm_bindgen]
 pub fn start_browser(canvas: sursface::wgpu::web_sys::HtmlCanvasElement) {
-    use sursface::start;
-    start::create_window_browser(canvas, &init, &render, &event);
+    sursface::start::create_window_browser(canvas, AppHandlers {
+        init,
+        render,
+        event,
+        ..Default::default()
+    });
 }
 
 #[cfg(target_arch = "wasm32")]
diff --git a/sursface/src/app.rs b/sursface/src/app.rs
index a6f2553..7eeb110 100644
--- a/sursface/src/app.rs
+++ b/sursface/src/app.rs
@@ -1,7 +1,7 @@
 use std::sync::{Arc, Mutex};
 use winit::application::ApplicationHandler;
 use winit::dpi::PhysicalSize;
-use winit::event::{ElementState, KeyEvent, WindowEvent};
+use winit::event::{DeviceEvent, ElementState, KeyEvent, WindowEvent};
 use winit::event_loop::ActiveEventLoop;
 use winit::keyboard::{KeyCode, PhysicalKey};
 use winit::window::WindowId;
@@ -17,9 +17,25 @@ pub struct App<'a, State> {
     #[cfg(target_arch = "wasm32")]
     pub canvas: wgpu::web_sys::HtmlCanvasElement,
     pub state: Option<Arc<Mutex<State>>>,
-    pub init: Arc<dyn Fn(&mut Display) -> State>,
-    pub render: Arc<dyn Fn(&mut Display, &mut State)>,
-    pub event: Arc<dyn Fn(&mut Display, &mut State, WindowEvent)>,
+    pub handlers: AppHandlers<State>
+}
+
+pub struct AppHandlers<State> {
+    pub init: fn(&mut Display) -> State,
+    pub render: fn(&mut Display, &mut State),
+    pub event: fn(&mut Display, &mut State, WindowEvent),
+    pub device_event: fn(&mut Display, &mut State, DeviceEvent),
+}
+
+impl<State> Default for AppHandlers<State> {
+    fn default() -> Self {
+        AppHandlers {
+            init: |_display: &mut Display| panic!("init handler not provided"),
+            render: |_display: &mut Display, _state: &mut State| {},
+            event: |_display: &mut Display, _state: &mut State, _event: WindowEvent| {},
+            device_event: |_display: &mut Display, _state: &mut State, _event: DeviceEvent| {},
+        }
+    }
 }
 
 
@@ -62,27 +78,23 @@ impl<'a, State> App<'a, State> {
     #[cfg(not(target_arch = "wasm32"))]
     pub fn from_window_size(
         size: PhysicalSize<u32>,
-        init_func: &'static dyn Fn(&mut Display) -> State,
-        render_func: &'static dyn Fn(&mut Display, &mut State),
-        event_func: &'static dyn Fn(&mut Display, &mut State, WindowEvent)) -> Self
+        handlers: AppHandlers<State>) -> Self
     {
+
         log::debug!("Setting window size");
         App {
             initial_size: size,
             display: None,
             state: None,
-            init: Arc::new(init_func),
-            render: Arc::new(render_func),
-            event: Arc::new(event_func)
+            handlers
         }
     }
 
+
     #[cfg(target_arch = "wasm32")]
     pub fn from_canvas(
         canvas: wgpu::web_sys::HtmlCanvasElement,
-        init_func: &'static dyn Fn(&mut Display) -> State,
-        render_func: &'static dyn Fn(&mut Display, &mut State),
-        event_func: &'static dyn Fn(&mut Display, &mut State, WindowEvent)) -> Self
+        handlers: AppHandlers<State>) -> Self
     {
         log::debug!("Setting canvas size");
         App {
@@ -90,9 +102,7 @@ impl<'a, State> App<'a, State> {
             canvas,
             display: None,
             state: None,
-            init: Arc::new(init_func),
-            render: Arc::new(render_func),
-            event: Arc::new(event_func)
+            handlers
         }
     }
 }
@@ -110,18 +120,13 @@ impl<'a, State> ApplicationHandler for App<'a, State> {
             self.display = Some(Arc::new(Mutex::new(Display::from_canvas(event_loop, self.canvas.clone()))));
         }
 
-        let new_state = {
-            let init_fn = Arc::clone(&self.init);
-            init_fn(&mut self.display.clone().unwrap().lock().unwrap())
-        };
-
-        // Now, set the state with a mutable borrow
+        let new_state = (&self.handlers.init)(&mut self.display.clone().unwrap().lock().unwrap());
         self.state = Some(Arc::new(Mutex::new(new_state)));
     }
     
     fn window_event(&mut self, event_loop: &ActiveEventLoop, _id: WindowId, event: WindowEvent) {
         let mut display = self.display.as_ref().clone().unwrap().lock().unwrap();
-        (Arc::clone(&self.event))(&mut display, &mut self.state.clone().unwrap().lock().unwrap(), event.clone());
+        (&self.handlers.event)(&mut display, &mut self.state.clone().unwrap().lock().unwrap(), event.clone());
 
         match event {
             WindowEvent::CloseRequested
@@ -141,10 +146,15 @@ impl<'a, State> ApplicationHandler for App<'a, State> {
                     display.resize(physical_size);
             }
             WindowEvent::RedrawRequested => {
-                (Arc::clone(&self.render))(&mut display, &mut self.state.clone().unwrap().lock().unwrap());
+                (self.handlers.render)(&mut display, &mut self.state.clone().unwrap().lock().unwrap());
                 display.window.as_ref().request_redraw();
             }
             _ => ()
         };
     }
+
+    fn device_event(&mut self, event_loop: &ActiveEventLoop, device_id: winit::event::DeviceId, event: winit::event::DeviceEvent) {
+        let mut display = self.display.as_ref().clone().unwrap().lock().unwrap();
+        (self.handlers.device_event)(&mut display, &mut self.state.clone().unwrap().lock().unwrap(), event.clone());
+    }
 }
\ No newline at end of file
diff --git a/sursface/src/start.rs b/sursface/src/start.rs
index ad591f3..155b73b 100644
--- a/sursface/src/start.rs
+++ b/sursface/src/start.rs
@@ -4,7 +4,7 @@ use winit::event_loop::{ControlFlow, EventLoop};
 use wgpu::web_sys::HtmlCanvasElement;
 
 use crate::app::App;
-use crate::display::Display;
+use crate::app::AppHandlers;
 
 #[cfg(target_arch = "wasm32")]
 extern crate console_error_panic_hook;
@@ -12,29 +12,23 @@ extern crate console_error_panic_hook;
 #[cfg(not(target_arch = "wasm32"))]
 pub fn create_window_desktop<State: 'static>(
     window_size: winit::dpi::PhysicalSize<u32>, 
-    init: &'static (dyn Fn(&mut Display) -> State), 
-    render: &'static dyn Fn(&mut Display, &mut State),
-    event: &'static dyn Fn(&mut Display, &mut State, winit::event::WindowEvent))
+    handlers: AppHandlers<State>)
 {
-
     let event_loop = EventLoop::new().unwrap();
     event_loop.set_control_flow(ControlFlow::Poll);
 
-    let mut app = App::from_window_size(window_size, init, render, event);
+    let mut app = App::from_window_size(window_size, handlers);
     event_loop.run_app(&mut app).unwrap();
 }
 
-
 #[cfg(target_arch = "wasm32")]
 pub fn create_window_browser<State: 'static>(
     canvas: HtmlCanvasElement, 
-    init: &'static (dyn Fn(&mut Display) -> State), 
-    render: &'static dyn Fn(&mut Display, &mut State),
-    event: &'static dyn Fn(&mut Display, &mut State, winit::event::WindowEvent)) 
+    handlers: AppHandlers<State>) 
 {
     let event_loop = EventLoop::new().unwrap();
     event_loop.set_control_flow(ControlFlow::Poll);
 
-    let mut app = App::from_canvas(canvas, init, render, event);
+    let mut app = App::from_canvas(canvas, handlers);
     event_loop.run_app(&mut app).unwrap();
 }
\ No newline at end of file