Struct ReactRes 

pub struct ReactRes<'w, R: ReactResource> { /* private fields */ }

Immutable reader for reactive resources.

Trait Implementations

impl<'w, R: ReactResource> Deref for ReactRes<'w, R>

type Target = R

The resulting type after dereferencing.

fn deref(&self) -> &R

Dereferences the value.

impl<'w, R: ReactResource> DetectChanges for ReactRes<'w, R>

fn added(&self) -> Tick

Returns the change tick recording the time this data was added.

fn is_added(&self) -> bool

Returns true if this value was added after the system last ran.

fn is_changed(&self) -> bool

Returns true if this value was added or mutably dereferenced either since the last time the system ran or, if the system never ran, since the beginning of the program.

fn last_changed(&self) -> Tick

Returns the change tick recording the time this data was most recently changed.

fn changed_by(&self) -> MaybeLocation

The location that last caused this to change.

impl<R: ReactResource> SystemParam for ReactRes<'_, R>

type State = FetchState<R>

Used to store data which persists across invocations of a system.

type Item<'w, 's> = ReactRes<'w, R>

The item type returned when constructing this system param. The value of this associated type should be Self, instantiated with new lifetimes.

fn init_state(world: &mut World, system_meta: &mut SystemMeta) -> Self::State

Registers any World access used by this SystemParam and creates a new instance of this param’s State.

unsafe fn new_archetype( state: &mut Self::State, archetype: &Archetype, system_meta: &mut SystemMeta, )

For the specified Archetype, registers the components accessed by this SystemParam (if applicable).a

fn apply(state: &mut Self::State, system_meta: &SystemMeta, world: &mut World)

Applies any deferred mutations stored in this SystemParam’s state. This is used to apply Commands during ApplyDeferred.

fn queue( state: &mut Self::State, system_meta: &SystemMeta, world: DeferredWorld<'_>, )

Queues any deferred mutations to be applied at the next ApplyDeferred.

unsafe fn validate_param<'w, 's>( state: &'s Self::State, _system_meta: &SystemMeta, _world: UnsafeWorldCell<'w>, ) -> Result<(), SystemParamValidationError>

Validates that the param can be acquired by the get_param.

unsafe fn get_param<'w, 's>( state: &'s mut Self::State, system_meta: &SystemMeta, world: UnsafeWorldCell<'w>, change_tick: Tick, ) -> Self::Item<'w, 's>

Creates a parameter to be passed into a SystemParamFunction.

impl<'w, 's, R: ReactResource> ReadOnlySystemParam for ReactRes<'w, R>

where Res<'w, ReactResInner<R>>: ReadOnlySystemParam,