pub trait Clickable {
    fn on_click(&mut self, callback: Option<Box<FnMut(&mut Clickable)>>);
    fn click(&mut self, skip_callbacks: bool);

    fn as_clickable(&self) -> &dyn Clickable;
    fn as_clickable_mut(&mut self) -> &mut dyn Clickable;
    fn into_clickable(self: Box<Self>) -> Box<dyn Clickable>;
}

pub trait Closeable {
    fn on_close(&mut self, callback: Option<Box<FnMut(&mut Closeable)>>);
    fn close(&mut self, skip_callbacks: bool);

    fn as_closeable(&self) -> &dyn Closeable;
    fn as_closeable_mut(&mut self) -> &mut dyn Closeable;
    fn into_closeable(self: Box<Self>) -> Box<dyn Closeable>;
}

// ... etc

fn main() {}