Trait Update

pub trait Update
where
    Self: Sized,
    Self::Msg: DisplayVariant,
{
    type Model;
    type ModelParam: Sized;
    type Msg;

    // Required methods
    fn model(relm: &Relm<Self>, param: Self::ModelParam) -> Self::Model;
    fn update(&mut self, event: Self::Msg);

    // Provided method
    fn subscriptions(&mut self, _relm: &Relm<Self>) { ... }
}

Trait for a basic (non-widget) component. A component has a model (data) associated with it and can mutate it when it receives a message (in the update() method).

Required Associated Types

type Model

The type of the model.

type ModelParam: Sized

The type of the parameter of the model() function used to initialize the model.

type Msg

The type of the messages sent to the update() method.

Required Methods

fn model(relm: &Relm<Self>, param: Self::ModelParam) -> Self::Model

Create the initial model.

fn update(&mut self, event: Self::Msg)

Method called when a message is received from an event.

Provided Methods

fn subscriptions(&mut self, _relm: &Relm<Self>)

Connect the subscriptions. Subscriptions are Future/Stream that are spawn when the object is created.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors