bevy_immediate_core 0.5.1

A simple, fast, and modular immediate mode UI library for Bevy
Documentation 
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use std::marker::PhantomData;

use ahash::HashMap;
use bevy_ecs::{
    entity::Entity,
    lifecycle,
    observer::On,
    system::{Query, ResMut},
};

use crate::{ImmId, immediate::ImmMarker};

#[derive(bevy_ecs::resource::Resource)]
pub struct ImmediateModeEntityMapping<Caps: Send + Sync + 'static> {
    pub(super) id_to_entity: HashMap<ImmId, Entity>,
    _ph: PhantomData<Caps>,
}

impl<Caps: Send + Sync + 'static> Default for ImmediateModeEntityMapping<Caps> {
    fn default() -> Self {
        Self {
            id_to_entity: Default::default(),
            _ph: Default::default(),
        }
    }
}

pub fn init<Caps: Send + Sync + 'static>(app: &mut bevy_app::App) {
    app.insert_resource(ImmediateModeEntityMapping::<Caps>::default());
    app.add_observer(on_imm_marker_added::<Caps>)
        .add_observer(on_imm_marker_removed::<Caps>);
}

fn on_imm_marker_added<Caps: Send + Sync + 'static>(
    trigger: On<lifecycle::Add, ImmMarker<Caps>>,
    marker: Query<&ImmMarker<Caps>>,
    mut mapping: ResMut<ImmediateModeEntityMapping<Caps>>,
) {
    let entity = trigger.event().entity;
    if let Ok(marker) = marker.get(entity) {
        let old = mapping.id_to_entity.insert(marker.id, entity);
        if let Some(old) = old {
            log::warn!(
                "Immediate mode entity id collision for entities {} and {}",
                entity,
                old
            );
        }
    }
}

fn on_imm_marker_removed<Caps: Send + Sync + 'static>(
    trigger: On<lifecycle::Remove, ImmMarker<Caps>>,
    marker: Query<&ImmMarker<Caps>>,
    mut mapping: ResMut<ImmediateModeEntityMapping<Caps>>,
) {
    let entity = trigger.event().entity;
    if let Ok(marker) = marker.get(entity) {
        mapping.id_to_entity.remove(&marker.id);
    }
}