Type Alias OnMouseFn 

pub type OnMouseFn = Arc<dyn Fn(MouseMsg) -> Cmd + Send + Sync>;

OnMouseFn closure type for View mouse handlers.

Arc (rather than Box) so that View clones preserve the handler: the renderer clones the view each frame and needs the closure on last_view to route mouse messages back to the model.

Aliased Type

pub struct OnMouseFn { /* private fields */ }