Struct MemoizedSignal 

pub struct MemoizedSignal<T: 'static> { /* private fields */ }

A signal for creating a value once, when requested. The value is immutable after creation. Calling Signal::set, Signal::set_value, Signal::listen or Signal::notify has no effect.

NOTE: The inner factory function will only be called once, when the value is requested via Signal::get.

Implementations

impl<T: 'static> MemoizedSignal<T>

pub fn new(factory: impl Fn() -> T + 'static) -> Self

Create a new memoized signal using the given factory function.

pub fn is_init(&self) -> bool

Returns if the value has been initialized or not.

Trait Implementations

impl<T: 'static> Clone for MemoizedSignal<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: 'static> Signal<T> for MemoizedSignal<T>

fn get(&self) -> Ref<'_, T>

Get a reference to the current value of the signal.

fn set_value(&self, _: T)

Set the value of the signal.

fn listen(self, listener: Box<dyn Fn(Ref<'_, T>)>) -> Self

where Self: Sized,

Add a listener to the signal, which will be called when the inner value changes and returns the signal.

fn notify(&self)

Notify listeners that the inner value has changed. May also be called manually to update listeners.

fn dyn_clone(&self) -> Box<dyn Signal<T>>

Clones the signal into a Box<dyn Signal<T>>.

fn set(&self, value: T)

Set the value of the signal and notify listeners.

fn maybe(&self) -> MaybeSignal<T>

where Self: Sized,

Converts the signal into a MaybeSignal.

fn map<U: 'static>( &self, map: impl Fn(Ref<'_, T>) -> Ref<'_, U> + 'static, ) -> MapSignal<T, U>

where Self: Sized,

Converts this signal into a MapSignal and applies the given mapping function.

fn hook(self, context: &AppContext) -> Self

where Self: Sized,

Hooks the signal into the given AppContext.