Trait iced::program::Definition

pub trait Definition: Sized {
    type State;
    type Message: Send + Debug;
    type Theme: Default + DefaultStyle;
    type Renderer: Renderer;
    type Executor: Executor;

    // Required methods
    fn load(&self) -> Command<Self::Message>;
    fn update(
        &self,
        state: &mut Self::State,
        message: Self::Message
    ) -> Command<Self::Message>;
    fn view<'a>(
        &self,
        state: &'a Self::State
    ) -> Element<'a, Self::Message, Self::Theme, Self::Renderer>;

    // Provided methods
    fn title(&self, _state: &Self::State) -> String { ... }
    fn subscription(&self, _state: &Self::State) -> Subscription<Self::Message> { ... }
    fn theme(&self, _state: &Self::State) -> Self::Theme { ... }
    fn style(&self, _state: &Self::State, theme: &Self::Theme) -> Appearance { ... }
}

The internal definition of a Program.

You should not need to implement this trait directly. Instead, use the methods available in the Program struct.

Required Associated Types

type State

The state of the program.

type Message: Send + Debug

The message of the program.

type Theme: Default + DefaultStyle

The theme of the program.

type Renderer: Renderer

The renderer of the program.

type Executor: Executor

The executor of the program.

Required Methods

fn load(&self) -> Command<Self::Message>

fn update( &self, state: &mut Self::State, message: Self::Message ) -> Command<Self::Message>

fn view<'a>( &self, state: &'a Self::State ) -> Element<'a, Self::Message, Self::Theme, Self::Renderer>

Provided Methods

fn title(&self, _state: &Self::State) -> String

fn subscription(&self, _state: &Self::State) -> Subscription<Self::Message>

fn theme(&self, _state: &Self::State) -> Self::Theme

fn style(&self, _state: &Self::State, theme: &Self::Theme) -> Appearance

Object Safety

This trait is not object safe.

Implementors