Struct bevy_cobweb::react::Reactive

pub struct Reactive<'w, 's, T: ReactComponent> { /* private fields */ }

System parameter for accessing React<T> components immutably.

See ReactiveMut for the mutable version.

Implementations

impl<'w, 's, T: ReactComponent> Reactive<'w, 's, T>

pub fn get(&self, entity: Entity) -> Option<&T>

Reads T on entity.

Does not trigger reactions.

pub fn single(&self) -> (Entity, &T)

Reads T on a single entity.

Does not trigger reactions.

Panics if the inner query doesn’t have exactly one entity.

Trait Implementations

impl<T: ReactComponent> SystemParam for Reactive<'_, '_, T>

type State = FetchState<T>

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

type Item<'w, 's> = Reactive<'w, 's, T>

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 apply_deferred.

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

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

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, T: ReactComponent> ReadOnlySystemParam for Reactive<'w, 's, T>

where Query<'w, 's, (Entity, &'static React<T>)>: ReadOnlySystemParam,