Struct MapSignal 

pub struct MapSignal<T: 'static, U: 'static> { /* private fields */ }

A signal wrapping another signal and applying a mapping function, when the inner value is requested. The mapping function will be called every time the inner value is requested via Signal::get. This signal cannot be directly mutated. Use MapSignal::signal to get the inner signal.

Calling Signal::set, Signal::set_value, Signal::listen has no effect.

Implementations

impl<T: 'static, U: 'static> MapSignal<T, U>

pub fn new( signal: BoxedSignal<T>, map: impl Fn(Ref<'_, T>) -> Ref<'_, U> + 'static, ) -> Self

Create a new map signal using the given inner signal and mapping function.

pub fn signal(&self) -> BoxedSignal<T>

Get the inner signal.

Can be used to mutate the inner value.

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

Get the inner signal’s value, without applying the mapping function.

Trait Implementations

impl<T: 'static, U: 'static> Clone for MapSignal<T, U>

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, U: 'static> From<MapSignal<T, U>> for MaybeSignal<U>

fn from(value: MapSignal<T, U>) -> Self

Converts to this type from the input type.

impl<T: 'static, U: 'static> Signal<U> for MapSignal<T, U>

fn get(&self) -> Ref<'_, U>

Get a reference to the current value of the signal.

fn set_value(&self, _: U)

Set the value of the signal.

fn listen(self, _: Box<dyn Fn(Ref<'_, U>)>) -> 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<U>>

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.