iced_runtime/multi_window/
program.rs

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1//! Build interactive programs using The Elm Architecture.
2use crate::Task;
3use crate::core::text;
4use crate::core::window;
5use crate::core::{Element, Renderer};
6
7/// The core of a user interface for a multi-window application following The Elm Architecture.
8pub trait Program: Sized {
9    /// The graphics backend to use to draw the [`Program`].
10    type Renderer: Renderer + text::Renderer;
11
12    /// The type of __messages__ your [`Program`] will produce.
13    type Message: std::fmt::Debug + Send;
14
15    /// The theme used to draw the [`Program`].
16    type Theme;
17
18    /// Handles a __message__ and updates the state of the [`Program`].
19    ///
20    /// This is where you define your __update logic__. All the __messages__,
21    /// produced by either user interactions or commands, will be handled by
22    /// this method.
23    ///
24    /// Any [`Task`] returned will be executed immediately in the background by the
25    /// runtime.
26    fn update(&mut self, message: Self::Message) -> Task<Self::Message>;
27
28    /// Returns the widgets to display in the [`Program`] for the `window`.
29    ///
30    /// These widgets can produce __messages__ based on user interaction.
31    fn view(
32        &self,
33        window: window::Id,
34    ) -> Element<'_, Self::Message, Self::Theme, Self::Renderer>;
35}
iced_runtime/multi_window/program.rs

iced_runtime/multi_window/
program.rs
