pub trait InputHandler {
// Required methods
fn mouse_down(&mut self, position: (f32, f32));
fn mouse_up(&mut self, _: (f32, f32));
fn mouse_wheel(&mut self, x: f32, y: f32);
fn mouse_move(&mut self, position: (f32, f32));
fn char_event(&mut self, character: char, shift: bool, ctrl: bool);
fn key_down(&mut self, key_down: KeyCode, shift: bool, ctrl: bool);
}