haalka হালকা

in bengali, haalka means "light" (e.g. not heavy) and can also be used to mean "easy"

haalka 是一个由 Bevy 提供支持的，人体工程学的反应式 UI 库，它由令人难以置信的 FRP 信号 futures-signals 和方便的异步ECS bevy-async-ecs 驱动，API 从网络UI库 MoonZoon 和 Dominator 端口。

虽然haalka主要针对UI，并提供高级UI抽象，但其 核心抽象 可以用于管理任何实体（不仅仅是 bevy_ui 节点）的信号驱动的反应性。

示例

use bevy::prelude::*;
use haalka::prelude::*;

fn main() {
    App::new()
        .add_plugins((DefaultPlugins, HaalkaPlugin))
        .add_systems(Startup, (ui_root, camera))
        .run();
}

#[derive(Component)]
struct Counter(Mutable<i32>);

fn ui_root(world: &mut World) {
    let counter = Mutable::new(0);
    El::<NodeBundle>::new()
        .height(Val::Percent(100.))
        .width(Val::Percent(100.))
        .align_content(Align::center())
        .child(
            Row::<NodeBundle>::new()
                .with_style(|mut style| style.column_gap = Val::Px(15.0))
                .item(counter_button(counter.clone(), "-", -1))
                .item(El::<TextBundle>::new().text_signal(counter.signal().map(text)))
                .item(counter_button(counter.clone(), "+", 1))
                .update_raw_el(move |raw_el| raw_el.insert(Counter(counter))),
        )
        .spawn(world);
}

fn counter_button(counter: Mutable<i32>, label: &str, step: i32) -> impl Element {
    let hovered = Mutable::new(false);
    El::<NodeBundle>::new()
        .width(Val::Px(45.0))
        .align_content(Align::center())
        .background_color_signal(
            hovered
                .signal()
                .map_bool(|| Color::hsl(300., 0.75, 0.85), || Color::hsl(300., 0.75, 0.75))
                .map(BackgroundColor),
        )
        .hovered_sync(hovered)
        .on_click(move || *counter.lock_mut() += step)
        .child(El::<TextBundle>::new().text(text(label)))
}

fn text(text: impl ToString) -> Text {
    Text::from_section(
        text.to_string(),
        TextStyle {
            font_size: 30.0,
            ..default()
        },
    )
}

fn camera(mut commands: Commands) {
    commands.spawn(Camera2dBundle::default());
}

cargo run --example counter  # the example above
cargo run --example button  # port of https://github.com/bevyengine/bevy/blob/main/examples/ui/button.rs
cargo run --example align  # alignment API demo, port of https://github.com/MoonZoon/MoonZoon/tree/main/examples/align and https://github.com/MoonZoon/MoonZoon/tree/main/examples/align_content
cargo run --example scroll  # scrollability API demo, inspired by https://github.com/mintlu8/bevy-rectray/blob/main/examples/scroll_discrete.rs
cargo run --example scroll_grid  # i can't believe it's not scrolling !
cargo run --example snake  # with adjustable grid size and tick rate
cargo run --example ecs_ui_sync  # forward ecs changes to the ui
cargo run --example key_values_sorted  # text inputs, scrolling/viewport control, and reactive lists; promises made promises kept ! https://discord.com/channels/691052431525675048/1192585689460658348/1193431789465776198 (yes i take requests)

# ui challenges from https://github.com/bevyengine/bevy/discussions/11100
cargo run --example challenge01  # game menu
cargo run --example challenge02  # inventory
cargo run --example challenge03  # health bar
cargo run --example challenge04  # responsive menu
cargo run --example challenge05  # character editor

您也可以使用 just (cargo install just) 运行示例，例如 just example snake -r。

Bevy兼容性

许可证

此存储库中的所有代码均可根据您的选择在以下两种许可证下使用

• MIT许可证 (LICENSE-MIT 或 https://open-source.org.cn/licenses/MIT)
• Apache许可证2.0版本 (LICENSE-APACHE 或 https://apache.ac.cn/licenses/LICENSE-2.0)

。

示例中使用的资产可能根据不同的条款进行许可，请参阅examples README。

您的贡献

除非您明确表示，否则根据Apache-2.0许可证定义的，您有意提交以包含在作品中并由您提交的贡献，将如上所述双重许可，而无需任何额外的条款或条件。