traiting.rs

pub trait ApplicationDelegate {
    fn application_did_quit(&mut self, _timestamp: u32) {}
}

pub struct MouseMotionEventInfo;
pub struct MouseButtonEventInfo;
pub struct MouseWheelEventInfo;

pub trait MouseDelegate {
    fn mouse_did_move(&mut self, _info: &MouseMotionEventInfo)  {}
    fn mouse_did_click(&mut self, _info: &MouseButtonEventInfo) {}
    fn mouse_did_scroll(&mut self, _info: &MouseWheelEventInfo) {}
}

pub struct NullDelegate;

impl ApplicationDelegate for NullDelegate {}
impl MouseDelegate for NullDelegate {}

impl NullDelegate {
    pub fn as_app<'a>(&'a mut self) -> &'a mut ApplicationDelegate {
        self as &mut ApplicationDelegate
    }
}