Struct reactive_state::Callback

pub struct Callback<State, Event>(_);

A wrapper for a callback which is notified of changes to Store State, and Events produced by the store.

Example

The following example makes use of the AsListener trait implementation for Callback which allows it to be used in Store::subscribe(). The AsListener trait creates a weak reference to this callback in a Listener, which is given to the Store. When the callback is dropped, the listener will be removed from the store.

use reactive_state::Callback;

let callback = Callback::new(|_state, _event| {
    println!("Callback invoked");
});

store.subscribe(&callback);

Optional Features

If the "yew" crate feature is enabled, a number of From implementations are available to convert yew callbacks into this:

• From<yew::Callback<Rc<State>>>
• From<yew::Callback<(Rc<State>, Event)>>
• From<yew::Callback<()>>

Implementations

impl<State, Event> Callback<State, Event>

pub fn new<C: Fn(Rc<State>, Option<Event>) + 'static>(closure: C) -> Self

pub fn emit(&self, state: Rc<State>, event: Option<Event>)

Trait Implementations

impl<State, Event> AsListener<State, Event> for &Callback<State, Event>

fn as_listener(&self) -> Listener<State, Event>

Produce a Listener, a weak reference to this callback.

impl<State: Clone, Event: Clone> Clone for Callback<State, Event>

fn clone(&self) -> Callback<State, Event>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<C, State, Event> From<C> for Callback<State, Event> where
    C: Fn(Rc<State>, Option<Event>) + 'static, 

fn from(closure: C) -> Self

Performs the conversion.

impl<State, Event> From<Callback<()>> for Callback<State, Event> where
    State: 'static,
    Event: 'static, 

This is supported on crate feature yew only.

fn from(yew_callback: Callback<()>) -> Self

Performs the conversion.

impl<State, Event> From<Callback<(Rc<State>, Option<Event>)>> for Callback<State, Event> where
    State: 'static,
    Event: 'static, 

This is supported on crate feature yew only.

fn from(yew_callback: Callback<(Rc<State>, Option<Event>)>) -> Self

Performs the conversion.

impl<State, Event> From<Callback<Rc<State>>> for Callback<State, Event> where
    State: 'static,
    Event: 'static, 

This is supported on crate feature yew only.

fn from(yew_callback: Callback<Rc<State>>) -> Self

Performs the conversion.