Enum edge_frame::callback2::Callback2

pub enum Callback2<IN, OUT> {
    Callback2(Rc<dyn Fn(IN) -> OUT>),
    Callback2Once(Rc<RefCell<Option<Box<dyn FnOnce(IN) -> OUT>>>>),
}

Universal closure wrapper.

Use closure adapters carefully, because if you call one from the `update` loop of a `Component` (even from JS) it will delay a message until next. Closure adapters should be used from JS closure adapters or `setTimeout` calls.

An `Rc` wrapper is used to make it cloneable.

Variants

Callback2(Rc<dyn Fn(IN) -> OUT>)

A closure which can be called multiple times

Callback2Once(Rc<RefCell<Option<Box<dyn FnOnce(IN) -> OUT>>>>)

A closure which can only be called once. The closure will panic if it is called more than once.

Implementations

impl<IN, OUT> Callback2<IN, OUT>

pub fn call(&self, value: IN) -> OUT

This method calls the closure’s function.

pub fn once<F>(func: F) -> Self where
    F: FnOnce(IN) -> OUT + 'static, 

Creates a closure from an FnOnce. The programmer is responsible for ensuring that the closure is only called once. If it is called more than once, the closure will panic.

impl<IN, OUT: Default> Callback2<IN, OUT>

pub fn noop() -> Self

Creates a “no-op” closure which can be used when it is not suitable to use an Option<Lambda>.

impl<IN: 'static, OUT: 'static> Callback2<IN, OUT>

pub fn reform<FI, FO, A, R>(
    &self,
    map_input: FI,
    map_output: FO
) -> Callback2<A, R> where
    FI: Fn(A) -> IN + 'static,
    FO: Fn(OUT) -> R + 'static, 

Changes the input & output types of the closure to others. Works like the map method but in the opposite direction.

Trait Implementations

impl<IN, OUT> Clone for Callback2<IN, OUT>

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<IN, OUT> Debug for Callback2<IN, OUT>

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

Formats the value using the given formatter.

impl<IN, OUT: Default> Default for Callback2<IN, OUT>

fn default() -> Self

Returns the “default value” for a type.

impl<IN, OUT, F: Fn(IN) -> OUT + 'static> From<F> for Callback2<IN, OUT>

fn from(func: F) -> Self

Converts to this type from the input type.

impl<IN, OUT> PartialEq<Callback2<IN, OUT>> for Callback2<IN, OUT>

fn eq(&self, other: &Callback2<IN, OUT>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<IN, OUT> ImplicitClone for Callback2<IN, OUT>