Struct freya::prelude::Signal

pub struct Signal<T, S = UnsyncStorage>
where T: 'static, S: Storage<SignalData<T>>,
{ /* private fields */ }
Expand description

Creates a new Signal. Signals are a Copy state management solution with automatic dependency tracking.

use dioxus::prelude::*;
use dioxus_signals::*;

#[component]
fn App() -> Element {
    let mut count = use_signal(|| 0);

    // Because signals have automatic dependency tracking, if you never read them in a component, that component will not be re-rended when the signal is updated.
    // The app component will never be rerendered in this example.
    rsx! { Child { state: count } }
}

#[component]
fn Child(mut state: Signal<u32>) -> Element {
    use_future(move || async move {
        // Because the signal is a Copy type, we can use it in an async block without cloning it.
        state += 1;
    });

    rsx! {
        button {
            onclick: move |_| state += 1,
            "{state}"
        }
    }
}

Implementations§

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impl<T> Signal<T>
where T: 'static,

pub fn new(value: T) -> Signal<T>

Creates a new Signal. Signals are a Copy state management solution with automatic dependency tracking.

pub fn new_in_scope(value: T, owner: ScopeId) -> Signal<T>

Create a new signal with a custom owner scope. The signal will be dropped when the owner scope is dropped instead of the current scope.

pub const fn global(constructor: fn() -> T) -> GlobalSignal<T>

Creates a new global Signal that can be used in a global static.

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impl<T> Signal<T>
where T: PartialEq + 'static,

pub const fn global_memo(constructor: fn() -> T) -> GlobalMemo<T>

Creates a new global Signal that can be used in a global static.

pub fn memo(f: impl FnMut() -> T + 'static) -> Memo<T>

Creates a new unsync Selector. The selector will be run immediately and whenever any signal it reads changes.

Selectors can be used to efficiently compute derived data from signals.

pub fn memo_with_location( f: impl FnMut() -> T + 'static, location: &'static Location<'static>, ) -> Memo<T>

Creates a new unsync Selector with an explicit location. The selector will be run immediately and whenever any signal it reads changes.

Selectors can be used to efficiently compute derived data from signals.

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impl<T, S> Signal<T, S>
where T: 'static, S: Storage<SignalData<T>>,

pub fn new_maybe_sync(value: T) -> Signal<T, S>

Creates a new Signal. Signals are a Copy state management solution with automatic dependency tracking.

pub fn new_with_caller( value: T, caller: &'static Location<'static>, ) -> Signal<T, S>

Creates a new Signal. Signals are a Copy state management solution with automatic dependency tracking.

pub fn new_maybe_sync_in_scope(value: T, owner: ScopeId) -> Signal<T, S>

Create a new signal with a custom owner scope. The signal will be dropped when the owner scope is dropped instead of the current scope.

pub fn manually_drop(&self) -> Option<T>

Drop the value out of the signal, invalidating the signal in the process.

pub fn origin_scope(&self) -> ScopeId

Get the scope the signal was created in.

pub fn id(&self) -> GenerationalBoxId

Get the generational id of the signal.

pub fn write_silent(&self) -> <S as AnyStorage>::Mut<'static, T>

👎Deprecated: This pattern is no longer recommended. Prefer peek or creating new signals instead.

This pattern is no longer recommended. Prefer peek or creating new signals instead.

This function is the equivalent of the write_silent method on use_ref.

§What you should use instead
§Reading and Writing to data in the same scope

Reading and writing to the same signal in the same scope will cause that scope to rerun forever:

let mut signal = use_signal(|| 0);
// This makes the scope rerun whenever we write to the signal
println!("{}", *signal.read());
// This will rerun the scope because we read the signal earlier in the same scope
*signal.write() += 1;

You may have used the write_silent method to avoid this infinite loop with use_ref like this:

let signal = use_signal(|| 0);
// This makes the scope rerun whenever we write to the signal
println!("{}", *signal.read());
// Write silent will not rerun any subscribers
*signal.write_silent() += 1;

Instead you can use the peek and write methods instead. The peek method will not subscribe to the current scope which will avoid an infinite loop if you are reading and writing to the same signal in the same scope.

let mut signal = use_signal(|| 0);
// Peek will read the value but not subscribe to the current scope
println!("{}", *signal.peek());
// Write will update any subscribers which does not include the current scope
*signal.write() += 1;
§Reading and Writing to different data

This pattern is no longer recommended because it is very easy to allow your state and UI to grow out of sync. write_silent globally opts out of automatic state updates which can be difficult to reason about.

Lets take a look at an example: main.rs:

fn app() -> Element {
    let signal = use_context_provider(|| Signal::new(0));
     
    // We want to log the value of the signal whenever the app component reruns
    println!("{}", *signal.read());
     
    rsx! {
        button {
            // If we don't want to rerun the app component when the button is clicked, we can use write_silent
            onclick: move |_| *signal.write_silent() += 1,
            "Increment"
        }
        Child {}
    }
}

child.rs:

fn Child() -> Element {
    let signal: Signal<i32> = use_context();
     
    // It is difficult to tell that changing the button to use write_silent in the main.rs file will cause UI to be out of sync in a completely different file
    rsx! {
        "{signal}"
    }
}

Instead peek locally opts out of automatic state updates explicitly for a specific read which is easier to reason about.

Here is the same example using peek: main.rs:

fn app() -> Element {
    let mut signal = use_context_provider(|| Signal::new(0));
     
    // We want to log the value of the signal whenever the app component reruns, but we don't want to rerun the app component when the signal is updated so we use peek instead of read
    println!("{}", *signal.peek());
     
    rsx! {
        button {
            // We can use write like normal and update the child component automatically
            onclick: move |_| *signal.write() += 1,
            "Increment"
        }
        Child {}
    }
}

child.rs:

fn Child() -> Element {
    let signal: Signal<i32> = use_context();
     
    rsx! {
        "{signal}"
    }
}

Trait Implementations§

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impl<T, S> Add<T> for Signal<T, S>
where T: Add<Output = T> + Copy + 'static, S: Storage<SignalData<T>>,

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type Output = T

The resulting type after applying the + operator.
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fn add(self, rhs: T) -> <Signal<T, S> as Add<T>>::Output

Performs the + operation. Read more
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impl<T, S> AddAssign<T> for Signal<T, S>
where T: Add<Output = T> + Copy + 'static, S: Storage<SignalData<T>>,

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fn add_assign(&mut self, rhs: T)

Performs the += operation. Read more
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impl<T, S> Clone for Signal<T, S>
where T: 'static, S: Storage<SignalData<T>>,

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fn clone(&self) -> Signal<T, S>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T, S> Debug for Signal<T, S>
where T: Debug + 'static, S: Storage<SignalData<T>>,

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

Formats the value using the given formatter. Read more
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impl<T, S> Default for Signal<T, S>
where T: Default + 'static, S: Storage<SignalData<T>>,

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fn default() -> Signal<T, S>

Returns the “default value” for a type. Read more
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impl<T, S> Deref for Signal<T, S>
where T: Clone, S: Storage<SignalData<T>> + 'static,

Allow calling a signal with signal() syntax

Currently only limited to copy types, though could probably specialize for string/arc/rc

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type Target = dyn Fn() -> T

The resulting type after dereferencing.
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fn deref(&self) -> &<Signal<T, S> as Deref>::Target

Dereferences the value.
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impl<T, S> Display for Signal<T, S>
where T: Display + 'static, S: Storage<SignalData<T>>,

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

Formats the value using the given formatter. Read more
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impl<T, S> Div<T> for Signal<T, S>
where T: Div<Output = T> + Copy + 'static, S: Storage<SignalData<T>>,

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type Output = T

The resulting type after applying the / operator.
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fn div(self, rhs: T) -> <Signal<T, S> as Div<T>>::Output

Performs the / operation. Read more
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impl<T, S> DivAssign<T> for Signal<T, S>
where T: Div<Output = T> + Copy + 'static, S: Storage<SignalData<T>>,

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fn div_assign(&mut self, rhs: T)

Performs the /= operation. Read more
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impl<T, S> From<Signal<T, S>> for ReadOnlySignal<T, S>
where T: 'static, S: Storage<SignalData<T>>,

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fn from(inner: Signal<T, S>) -> ReadOnlySignal<T, S>

Converts to this type from the input type.
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impl<T> IntoAttributeValue for Signal<T>

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fn into_value(self) -> AttributeValue

Convert into an attribute value
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impl<T> IntoDynNode for Signal<T>
where T: Clone + IntoDynNode,

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fn into_dyn_node(self) -> DynamicNode

Consume this item along with a scopestate and produce a DynamicNode Read more
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impl<T, S> Mul<T> for Signal<T, S>
where T: Mul<Output = T> + Copy + 'static, S: Storage<SignalData<T>>,

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type Output = T

The resulting type after applying the * operator.
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fn mul(self, rhs: T) -> <Signal<T, S> as Mul<T>>::Output

Performs the * operation. Read more
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impl<T, S> MulAssign<T> for Signal<T, S>
where T: Mul<Output = T> + Copy + 'static, S: Storage<SignalData<T>>,

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fn mul_assign(&mut self, rhs: T)

Performs the *= operation. Read more
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impl<T, S> PartialEq for Signal<T, S>
where T: 'static, S: Storage<SignalData<T>>,

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fn eq(&self, other: &Signal<T, S>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T, S> Readable for Signal<T, S>
where S: Storage<SignalData<T>>,

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fn peek_unchecked( &self, ) -> <<Signal<T, S> as Readable>::Storage as AnyStorage>::Ref<'static, <Signal<T, S> as Readable>::Target>

Get the current value of the signal. Unlike read, this will not subscribe the current scope to the signal which can cause parts of your UI to not update.

If the signal has been dropped, this will panic.

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type Target = T

The target type of the reference.
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type Storage = S

The type of the storage this readable uses.
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fn try_read_unchecked( &self, ) -> Result<<<Signal<T, S> as Readable>::Storage as AnyStorage>::Ref<'static, <Signal<T, S> as Readable>::Target>, BorrowError>

Try to get a reference to the value without checking the lifetime. This will subscribe the current scope to the signal. Read more
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fn map<O>( self, f: impl Fn(&Self::Target) -> &O + 'static, ) -> MappedSignal<O, Self::Storage>
where Self: Sized + Clone + 'static,

Map the readable type to a new type.
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fn read(&self) -> <Self::Storage as AnyStorage>::Ref<'_, Self::Target>

Get the current value of the state. If this is a signal, this will subscribe the current scope to the signal. If the value has been dropped, this will panic. Calling this on a Signal is the same as using the signal() syntax to read and subscribe to its value
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fn try_read( &self, ) -> Result<<Self::Storage as AnyStorage>::Ref<'_, Self::Target>, BorrowError>

Try to get the current value of the state. If this is a signal, this will subscribe the current scope to the signal.
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fn read_unchecked( &self, ) -> <Self::Storage as AnyStorage>::Ref<'static, Self::Target>

Get a reference to the value without checking the lifetime. This will subscribe the current scope to the signal. Read more
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fn peek(&self) -> <Self::Storage as AnyStorage>::Ref<'_, Self::Target>

Get the current value of the state without subscribing to updates. If the value has been dropped, this will panic.
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fn with<O>(&self, f: impl FnOnce(&Self::Target) -> O) -> O

Run a function with a reference to the value. If the value has been dropped, this will panic.
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fn with_peek<O>(&self, f: impl FnOnce(&Self::Target) -> O) -> O

Run a function with a reference to the value. If the value has been dropped, this will panic.
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fn index<I>( &self, index: I, ) -> <Self::Storage as AnyStorage>::Ref<'_, <Self::Target as Index<I>>::Output>
where Self::Target: Index<I>,

Index into the inner value and return a reference to the result. If the value has been dropped or the index is invalid, this will panic.
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impl<T, S> Sub<T> for Signal<T, S>
where T: Sub<Output = T> + Copy + 'static, S: Storage<SignalData<T>>,

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type Output = T

The resulting type after applying the - operator.
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fn sub(self, rhs: T) -> <Signal<T, S> as Sub<T>>::Output

Performs the - operation. Read more
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impl<T, S> SubAssign<T> for Signal<T, S>
where T: Sub<Output = T> + Copy + 'static, S: Storage<SignalData<T>>,

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fn sub_assign(&mut self, rhs: T)

Performs the -= operation. Read more
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impl<T, S> Writable for Signal<T, S>
where T: 'static, S: Storage<SignalData<T>>,

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type Mut<'a, R: 'static + ?Sized> = Write<'a, R, S>

The type of the reference.
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fn map_mut<I, U, F>( ref_: <Signal<T, S> as Writable>::Mut<'_, I>, f: F, ) -> <Signal<T, S> as Writable>::Mut<'_, U>
where U: 'static + ?Sized, F: FnOnce(&mut I) -> &mut U, I: ?Sized,

Map the reference to a new type.
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fn try_map_mut<I, U, F>( ref_: <Signal<T, S> as Writable>::Mut<'_, I>, f: F, ) -> Option<<Signal<T, S> as Writable>::Mut<'_, U>>
where I: 'static + ?Sized, U: 'static + ?Sized, F: FnOnce(&mut I) -> Option<&mut U>,

Try to map the reference to a new type.
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fn downcast_lifetime_mut<'a, 'b, R>( mut_: <Signal<T, S> as Writable>::Mut<'a, R>, ) -> <Signal<T, S> as Writable>::Mut<'b, R>
where 'a: 'b, R: 'static + ?Sized,

Downcast a mutable reference in a RefMut to a more specific lifetime Read more
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fn try_write_unchecked( &self, ) -> Result<<Signal<T, S> as Writable>::Mut<'static, <Signal<T, S> as Readable>::Target>, BorrowMutError>

Try to get a mutable reference to the value without checking the lifetime. This will update any subscribers. Read more
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fn write(&mut self) -> Self::Mut<'_, Self::Target>

Get a mutable reference to the value. If the value has been dropped, this will panic.
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fn try_write(&mut self) -> Result<Self::Mut<'_, Self::Target>, BorrowMutError>

Try to get a mutable reference to the value.
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fn write_unchecked(&self) -> Self::Mut<'static, Self::Target>

Get a mutable reference to the value without checking the lifetime. This will update any subscribers. Read more
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fn with_mut<O>(&mut self, f: impl FnOnce(&mut Self::Target) -> O) -> O

Run a function with a mutable reference to the value. If the value has been dropped, this will panic.
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fn index_mut<I>( &mut self, index: I, ) -> Self::Mut<'_, <Self::Target as Index<I>>::Output>
where Self::Target: IndexMut<I>,

Index into the inner value and return a reference to the result.
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impl<T, S> Copy for Signal<T, S>
where T: 'static, S: Storage<SignalData<T>>,

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impl<T, S> Eq for Signal<T, S>
where T: 'static, S: Storage<SignalData<T>>,

Auto Trait Implementations§

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impl<T, S> Freeze for Signal<T, S>

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impl<T, S = UnsyncStorage> !RefUnwindSafe for Signal<T, S>

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impl<T, S> Send for Signal<T, S>
where T: Send, S: Sync,

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impl<T, S> Sync for Signal<T, S>
where T: Sync, S: Sync,

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impl<T, S> Unpin for Signal<T, S>
where T: Unpin,

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impl<T, S = UnsyncStorage> !UnwindSafe for Signal<T, S>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<T> DowncastSync for T
where T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Sync + Send>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
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impl<Q, K> Equivalent<K> for Q
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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> NoneValue for T
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type NoneType = T

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fn null_value() -> T

The none-equivalent value.
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<R, P> ReadPrimitive<R> for P
where R: Read + ReadEndian<P>, P: Default,

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fn read_from_little_endian(read: &mut R) -> Result<Self, Error>

Read this value from the supplied reader. Same as ReadEndian::read_from_little_endian().
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fn read_from_big_endian(read: &mut R) -> Result<Self, Error>

Read this value from the supplied reader. Same as ReadEndian::read_from_big_endian().
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fn read_from_native_endian(read: &mut R) -> Result<Self, Error>

Read this value from the supplied reader. Same as ReadEndian::read_from_native_endian().
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impl<T, R> ReadableOptionExt<T> for R
where T: 'static, R: Readable<Target = Option<T>>,

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fn unwrap(&self) -> T
where T: Clone,

Unwraps the inner value and clones it.
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fn as_ref(&self) -> Option<<Self::Storage as AnyStorage>::Ref<'_, T>>

Attempts to read the inner value of the Option.
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where T: 'static, R: Readable<Target = Vec<T>>,

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fn len(&self) -> usize

Returns the length of the inner vector.
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fn is_empty(&self) -> bool

Returns true if the inner vector is empty.
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fn first(&self) -> Option<<Self::Storage as AnyStorage>::Ref<'_, T>>

Get the first element of the inner vector.
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fn last(&self) -> Option<<Self::Storage as AnyStorage>::Ref<'_, T>>

Get the last element of the inner vector.
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fn get(&self, index: usize) -> Option<<Self::Storage as AnyStorage>::Ref<'_, T>>

Get the element at the given index of the inner vector.
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fn iter(&self) -> ReadableValueIterator<'_, Self>
where Self: Sized,

Get an iterator over the values of the inner vector.
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impl<T> Same for T

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type Output = T

Should always be Self
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where O: From<T>,

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fn super_from(input: T) -> O

Convert from a type to another type.
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Convert from a type to another type.
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fn to<T>(self) -> T
where Self: Into<T>,

Converts to T by calling Into<T>::into.
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where Self: TryInto<T>,

Tries to convert to T by calling TryInto<T>::try_into.
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where T: Clone,

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type Owned = T

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Creates owned data from borrowed data, usually by cloning. Read more
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Uses borrowed data to replace owned data, usually by cloning. Read more
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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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where U: Into<T>,

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type Error = Infallible

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Performs the conversion.
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Performs the conversion.
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impl<Cfg> TryIntoConfig for Cfg

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fn into_config(self) -> Option<Cfg>

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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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fn get_or_insert(&mut self, default: T) -> Self::Mut<'_, T>

Gets the value out of the Option, or inserts the given value if the Option is empty.
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Gets the value out of the Option, or inserts the value returned by the given function if the Option is empty.
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Attempts to write the inner value of the Option.
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fn push(&mut self, value: T)

Pushes a new value to the end of the vector.
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Pops the last value from the vector.
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fn insert(&mut self, index: usize, value: T)

Inserts a new value at the given index.
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fn remove(&mut self, index: usize) -> T

Removes the value at the given index.
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fn clear(&mut self)

Clears the vector, removing all values.
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fn extend(&mut self, iter: impl IntoIterator<Item = T>)

Extends the vector with the given iterator.
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fn truncate(&mut self, len: usize)

Truncates the vector to the given length.
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fn swap_remove(&mut self, index: usize) -> T

Swaps two values in the vector.
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fn retain(&mut self, f: impl FnMut(&T) -> bool)

Retains only the values that match the given predicate.
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fn split_off(&mut self, at: usize) -> Vec<T>

Splits the vector into two at the given index.
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fn get_mut(&mut self, index: usize) -> Option<Self::Mut<'_, T>>

Try to mutably get an element from the vector.
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fn iter_mut(&mut self) -> WritableValueIterator<'_, Self>
where Self: Sized + Clone,

Gets an iterator over the values of the vector.
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impl<T> CloneAny for T
where T: Any + Clone,

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impl<T> DependencyElement for T
where T: 'static + PartialEq + Clone,