96 lines
2.6 KiB
Rust
96 lines
2.6 KiB
Rust
use bevy_ecs::prelude::*;
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use bevy_property::Properties;
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use bevy_utils::{HashMap, HashSet};
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use std::{
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borrow::Cow,
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fmt::Debug,
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ops::{Deref, DerefMut},
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};
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/// A collection of labels
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#[derive(Default, Properties)]
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pub struct Labels {
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labels: HashSet<Cow<'static, str>>,
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}
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impl Debug for Labels {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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let mut list = f.debug_list();
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for label in self.iter() {
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list.entry(&label);
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}
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list.finish()
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}
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}
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impl<'a, T, L: Into<Cow<'static, str>>> From<T> for Labels
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where
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T: IntoIterator<Item = L>,
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{
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fn from(value: T) -> Self {
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let mut labels = HashSet::default();
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for label in value {
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labels.insert(label.into());
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}
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Self { labels }
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}
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}
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impl Labels {
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pub fn contains<T: Into<Cow<'static, str>>>(&self, label: T) -> bool {
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self.labels.contains(&label.into())
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}
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pub fn insert<T: Into<Cow<'static, str>>>(&mut self, label: T) {
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self.labels.insert(label.into());
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}
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pub fn iter(&self) -> impl Iterator<Item = &str> {
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self.labels.iter().map(|label| label.deref())
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}
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}
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/// Maintains a mapping from [Entity](bevy_ecs::prelude::Entity) ids to entity labels and entity labels to [Entities](bevy_ecs::prelude::Entity).
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#[derive(Debug, Default)]
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pub struct EntityLabels {
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label_entities: HashMap<Cow<'static, str>, Vec<Entity>>,
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entity_labels: HashMap<Entity, HashSet<Cow<'static, str>>>,
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}
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impl EntityLabels {
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pub fn get(&self, label: &str) -> Option<&[Entity]> {
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self.label_entities
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.get(label)
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.map(|entities| entities.as_slice())
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}
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}
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pub(crate) fn entity_labels_system(
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mut entity_labels: ResMut<EntityLabels>,
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// TODO: use change tracking when add/remove events are added
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// mut query: Query<(Entity, Changed<Labels>)>,
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query: Query<(Entity, &Labels)>,
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) {
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let entity_labels = entity_labels.deref_mut();
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for (entity, labels) in query.iter() {
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let current_labels = entity_labels
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.entity_labels
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.entry(entity)
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.or_insert_with(HashSet::default);
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for removed_label in current_labels.difference(&labels.labels) {
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if let Some(entities) = entity_labels.label_entities.get_mut(removed_label) {
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entities.retain(|e| *e != entity);
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}
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}
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for added_label in labels.labels.difference(¤t_labels) {
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if let Some(entities) = entity_labels.label_entities.get_mut(added_label) {
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entities.push(entity);
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}
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}
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*current_labels = labels.labels.clone();
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}
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}
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