anathema 0.2.11

Create beautiful, easily customisable terminal applications
Documentation 
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use anathema::component::*;
use anathema::prelude::*;

struct App;

#[derive(State)]
struct AppState {
    number: Value<i32>,
}

impl Component for App {
    type Message = ();
    type State = AppState;

    const TICKS: bool = false;

    fn on_event(
        &mut self,
        event: &mut UserEvent<'_>,
        state: &mut Self::State,
        _: Children<'_, '_>,
        _: Context<'_, '_, Self::State>,
    ) {
        if event.name() == "increment" {
            *state.number.to_mut() += 1;
        } else if event.name() == "decrement" {
            *state.number.to_mut() -= 1;
        }
    }

    fn accept_focus(&self) -> bool {
        false
    }
}

struct Button;

#[derive(State)]
struct ButtonState {
    active: Value<u8>,
}

impl Component for Button {
    type Message = ();
    type State = ButtonState;

    const TICKS: bool = false;

    fn on_blur(&mut self, state: &mut Self::State, _: Children<'_, '_>, _: Context<'_, '_, Self::State>) {
        state.active.set(0);
    }

    fn on_focus(&mut self, state: &mut Self::State, _: Children<'_, '_>, _: Context<'_, '_, Self::State>) {
        state.active.set(1);
    }

    fn on_mouse(
        &mut self,
        mouse: MouseEvent,
        _: &mut Self::State,
        mut children: Children<'_, '_>,
        mut context: Context<'_, '_, Self::State>,
    ) {
        let pos = mouse.pos();
        children.elements().at_position(pos).first(|_, _| {
            if mouse.left_down() {
                context.publish("click", ());

                let id = context.attributes.get_as::<i64>("id").unwrap();
                context.components.by_attribute("id", id).focus();
            }
        });
    }

    fn on_key(
        &mut self,
        key: KeyEvent,
        _: &mut Self::State,
        _: Children<'_, '_>,
        mut context: Context<'_, '_, Self::State>,
    ) {
        if !matches!(key.state, KeyState::Press) {
            return;
        }

        if let KeyCode::Enter = key.code {
            context.publish("click", ());
        }
    }
}

fn main() {
    let doc = Document::new("@main");

    let mut backend = TuiBackend::builder()
        .enable_alt_screen()
        .enable_raw_mode()
        .clear()
        .hide_cursor()
        .enable_mouse()
        .finish()
        .unwrap();
    backend.finalize();

    let mut builder = Runtime::builder(doc, &backend);

    builder
        .component(
            "main",
            "examples/templates/buttons/buttons.aml",
            App,
            AppState { number: 0.into() },
        )
        .unwrap();

    builder
        .prototype(
            "button",
            "examples/templates/buttons/button.aml",
            || Button,
            || ButtonState { active: 0.into() },
        )
        .unwrap();

    builder
        .finish(&mut backend, |runtime, backend| runtime.run(backend))
        .unwrap();
}