Struct LocaleSwitch 

pub struct LocaleSwitch<'w> { /* private fields */ }

What a locale switch writes: the app’s own i18n handle, and the base writing direction the new locale reads in.

Both are optional because not every world carries them. A bare world, or a host that installed no i18n, leaves a set_locale with nothing to switch, and it is dropped.

Trait Implementations

impl SystemParam for LocaleSwitch<'_>

type State = FetchState

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

type Item<'w, 's> = LocaleSwitch<'w>

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) -> Self::State

Creates a new instance of this param’s State.

fn init_access( state: &Self::State, system_meta: &mut SystemMeta, component_access_set: &mut FilteredAccessSet, world: &mut World, )

Registers any [World] access used by this [SystemParam].

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

Creates a parameter to be passed into a SystemParamFunction.

impl<'w, 's> ReadOnlySystemParam for LocaleSwitch<'w>

where Option<ResMut<'w, AppI18n>>: ReadOnlySystemParam, Option<ResMut<'w, DefaultLayoutDirection>>: ReadOnlySystemParam,