bevy-compose 0.2.0-alpha.3

Reactive UI framework for Bevy.

This crate provides a framework for UI and other reactive systems using the ECS. Components can be created with lazy and run in parallel like regular systems (they can even use Local and other system parameters).

use bevy::prelude::*;
use bevy_compose::TemplatePlugin;

#[derive(Component, Deref)]
struct Health(i32);

#[derive(Component, Deref)]
struct Damage(i32);

#[derive(Component)]
struct Zombie;

fn main() {
    App::new()
        .add_plugins(TemplatePlugin::default().with_template(
            Zombie,
            (
                || Health(100),
                |entity: In<Entity>, health_query: Query<&Health>| {
                    let health = health_query.get(*entity).unwrap();
                    Damage(**health * 2)
                },
            ),
        ))
        .add_systems(Startup, setup)
        .add_systems(PostUpdate, debug)
        .run();
}

fn setup(mut commands: Commands) {
    commands.spawn(Zombie);
}

fn debug(query: Query<&Damage>) {
    for dmg in &query {
        dbg!(**dmg);
    }
}

Inspiration

This crate is inspired by Xilem, Concoct and SwiftUI with its typed approach to reactivity.