Trait wnf::StateListener

pub trait StateListener<T>
where
    T: ?Sized,
{
    // Required method
    fn call(&mut self, accessor: DataAccessor<'_, T>);
}

Available on crate feature subscribe only.

A trait for types that are capable of listening to state updates

Note that there is a blanket implementation of this trait for all closure types F: FnMut(DataAccessor<'_, T>), so you usually don’t need to implement this trait for your own types. It is useful, however, if you need a state listener whose type you can name explicitly. Since closure types are anonymous, you can instead define your own type and implement StateListener<T> for it.

Required Methods

fn call(&mut self, accessor: DataAccessor<'_, T>)

Calls this state listener

The provided DataAccessor<'_, T> can be used to obtain the state data at the time the update took place.

Implementors

impl<F, T> StateListener<T> for F

where F: FnMut(DataAccessor<'_, T>), T: ?Sized,