Trait workflow_wasm::convert::TryCastFromJs

pub trait TryCastFromJs
where
    Self: CastFromJs + RefFromWasmAbi<Abi = u32> + LongRefFromWasmAbi<Abi = u32> + Clone,
{
    type Error: Display + From<Error>;

    // Required method
    fn try_cast_from(
        value: impl AsRef<JsValue>,
    ) -> Result<Cast<Self>, Self::Error>;

    // Provided methods
    fn try_owned_from(value: impl AsRef<JsValue>) -> Result<Self, Self::Error> { ... }
    fn resolve(
        js: impl AsRef<JsValue>,
        create: impl FnOnce() -> Result<Self, Self::Error>,
    ) -> Result<Cast<Self>, Self::Error> { ... }
    fn resolve_cast(
        js: impl AsRef<JsValue>,
        create: impl FnOnce() -> Result<Cast<Self>, Self::Error>,
    ) -> Result<Cast<Self>, Self::Error> { ... }
}

TryCastFromJs trait is meant to be implemented by the developer on any struct implementing CastFromJs trait. This trait provides a way to attempt to cast a JsValue into a Rust object or interpret the source data and create a temporary struct owned by by the Cast.

Required Associated Types

type Error: Display + From<Error>

Required Methods

fn try_cast_from(value: impl AsRef<JsValue>) -> Result<Cast<Self>, Self::Error>

Try to cast a JsValue into a Rust object. This should be user-defined function that attempts to cast a JsValue into a Rust object or interpret a source data and create a temporary struct owned by by the Cast.

Provided Methods

fn try_owned_from(value: impl AsRef<JsValue>) -> Result<Self, Self::Error>

Perform a user cast and consume the Cast container. This function will return a temporary user-created object created during [try_cast_from] or a clone of the casted reference.

fn resolve( js: impl AsRef<JsValue>, create: impl FnOnce() -> Result<Self, Self::Error>, ) -> Result<Cast<Self>, Self::Error>

Try to cast a JsValue into a Rust object, in cast of failure invoke a user-supplied closure that can try to create an instance of the object based on the supplied JsValue.

fn resolve_cast( js: impl AsRef<JsValue>, create: impl FnOnce() -> Result<Cast<Self>, Self::Error>, ) -> Result<Cast<Self>, Self::Error>

Try to cast a JsValue into a Rust object, in cast of failure invoke a user-supplied closure that can try to create an instance of the object based on the supplied JsValue. Unlike the [resolve] function, this function expects create closure to return a Cast. This is useful when routing the creation of the object to another function that is capable of creating a compatible Cast wrapper.

Object Safety

This trait is not object safe.

Implementors