Struct ChangeNotifier 

pub struct ChangeNotifier { /* private fields */ }

A notifier with nothing to say but changed.

Cloning gives another handle to the same notifier.

Implementations

impl ChangeNotifier

pub fn new() -> Self

A notifier nobody is listening to yet.

pub fn notify_listeners(&self)

Tells every listener, in the order they were added, and asks for a rebuild.

A listener that adds or drops another during the notification does not disturb it: the ones told are those there when it began.

pub fn listener_count(&self) -> usize

How many listeners there are.

Trait Implementations

impl Clone for ChangeNotifier

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ChangeNotifier

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ChangeNotifier

fn default() -> Self

Returns the “default value” for a type.

impl Listenable for ChangeNotifier

fn add_listener(&self, listener: impl Fn() + 'static) -> Subscription

Calls listener whenever this changes, until the returned Subscription is dropped.