Struct Assets 

pub struct Assets<A>
where
    A: Asset,
{ /* private fields */ }

Stores Asset values identified by their AssetId.

Assets identified by AssetId::Index will be stored in a “dense” vec-like storage. This is more efficient, but it means that the assets can only be identified at runtime. This is the default behavior.

Assets identified by AssetId::Uuid will be stored in a hashmap. This is less efficient, but it means that the assets can be referenced at compile time.

This tracks (and queues) AssetEvent events whenever changes to the collection occur.

Implementations

impl<A> Assets<A>

where A: Asset,

pub fn get_handle_provider(&self) -> AssetHandleProvider

Retrieves an AssetHandleProvider capable of reserving new Handle values for assets that will be stored in this collection.

pub fn insert(&mut self, id: impl Into<AssetId<A>>, asset: A)

Inserts the given asset, identified by the given id. If an asset already exists for id, it will be replaced.

pub fn get_or_insert_with( &mut self, id: impl Into<AssetId<A>>, insert_fn: impl FnOnce() -> A, ) -> &mut A

Retrieves an Asset stored for the given id if it exists. If it does not exist, it will be inserted using insert_fn.

pub fn contains(&self, id: impl Into<AssetId<A>>) -> bool

Returns true if the id exists in this collection. Otherwise it returns false.

pub fn add(&mut self, asset: A) -> Handle<A>

Adds the given asset and allocates a new strong Handle for it.

pub fn get(&self, id: impl Into<AssetId<A>>) -> Option<&A>

Retrieves a reference to the Asset with the given id, if its exists. Note that this supports anything that implements Into<AssetId<A>>, which includes Handle and AssetId.

pub fn get_mut(&mut self, id: impl Into<AssetId<A>>) -> Option<&mut A>

Retrieves a mutable reference to the Asset with the given id, if its exists. Note that this supports anything that implements Into<AssetId<A>>, which includes Handle and AssetId.

pub fn remove(&mut self, id: impl Into<AssetId<A>>) -> Option<A>

Removes (and returns) the Asset with the given id, if its exists. Note that this supports anything that implements Into<AssetId<A>>, which includes Handle and AssetId.

pub fn remove_untracked(&mut self, id: impl Into<AssetId<A>>) -> Option<A>

Removes (and returns) the Asset with the given id, if its exists. This skips emitting AssetEvent::Removed. Note that this supports anything that implements Into<AssetId<A>>, which includes Handle and AssetId.

pub fn is_empty(&self) -> bool

Returns true if there are no assets in this collection.

pub fn len(&self) -> usize

Returns the number of assets currently stored in the collection.

pub fn ids(&self) -> impl Iterator<Item = AssetId<A>>

Returns an iterator over the AssetId of every Asset stored in this collection.

pub fn iter(&self) -> impl Iterator<Item = (AssetId<A>, &A)>

Returns an iterator over the AssetId and Asset ref of every asset in this collection.

pub fn iter_mut(&mut self) -> AssetsMutIterator<'_, A>

Returns an iterator over the AssetId and mutable Asset ref of every asset in this collection.

pub fn track_assets( assets: ResMut<'_, Assets<A>>, asset_server: Res<'_, AssetServer>, )

A system that synchronizes the state of assets in this collection with the AssetServer. This manages Handle drop events and adds queued AssetEvent values to their Events resource.

pub fn asset_events( assets: ResMut<'_, Assets<A>>, events: EventWriter<'_, AssetEvent<A>>, )

A system that applies accumulated asset change events to the Events resource.

Trait Implementations

impl<A> Default for Assets<A>

where A: Asset,

fn default() -> Assets<A>

Returns the “default value” for a type.

impl<A> Resource for Assets<A>

where A: Asset, Assets<A>: Send + Sync + 'static,