Struct UndoScheduler 

pub struct UndoScheduler<'w, E: Event + Clone> { /* private fields */ }

Implementations

impl<'w, E: Event + Clone> UndoScheduler<'w, E>

pub fn register(&mut self, event: E)

Register the undo-event　in the registered area.

Events can registered multiple, and when UndoRequester::undo is called, last registered will sent

pub fn reserve(&mut self, event: E)

Place the undo-event in the reserved area.

Events is in placed on same reserved area until reserve_commit is called.

This method is useful when want to sent multiple undo-event with single call UndoRequest::undo .

pub fn register_all_reserved(&mut self)

Moves all events placed on the reserved area by reserve to the registered area.

impl<'w, E: Event + Clone + Default> UndoScheduler<'w, E>

pub fn register_default(&mut self)

Register the undo-event　in the registered area with default value.

Events can registered multiple, and when UndoRequester::undo is called, last registered will sent

pub fn reserve_default(&mut self)

Place the undo-event in the reserved area with default value.

Events is in placed on same reserved area until reserve_commit is called.

This method is useful when want to sent multiple undo-event with single call UndoRequest::undo .

Trait Implementations

impl<E: Event + Clone> SystemParam for UndoScheduler<'_, E>

type State = FetchState<E>

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

type Item<'w, 's> = UndoScheduler<'w, E>

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.

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).

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.

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, E: Event + Clone> ReadOnlySystemParam for UndoScheduler<'w, E>

where ResMut<'w, UndoCounter>: ReadOnlySystemParam, ResMut<'w, UndoReservedArea<E>>: ReadOnlySystemParam, ResMut<'w, ReserveCounter>: ReadOnlySystemParam, EventWriter<'w, UndoEvent<E>>: ReadOnlySystemParam, EventWriter<'w, RequestCommitReservationsFromSchedulerEvent>: ReadOnlySystemParam,