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use bevy::ecs::system::SystemParam;
use bevy::prelude::{Event, EventWriter, ResMut};
use crate::counter::UndoCounter;
use crate::reserve::{RequestCommitReservationsEvent, RequestCommitReservationsFromSchedulerEvent, ReserveCounter, UndoReservedArea, UndoReserveEvent};
#[cfg(feature = "callback_event")]
pub mod callback;
#[derive(Event, Clone)]
pub(crate) struct UndoEvent<E: Event + Clone> {
pub inner: E,
pub no: usize,
}
#[derive(SystemParam)]
pub struct UndoReserveCommitter<'w> {
ew: EventWriter<'w, RequestCommitReservationsEvent>,
}
impl<'w> UndoReserveCommitter<'w> {
/// Moves all events placed on the reserved area by [`reserve`](UndoScheduler::reserve) to the registered area.
#[inline(always)]
pub fn commit(&mut self) {
self.ew.send(RequestCommitReservationsEvent);
}
}
#[derive(SystemParam)]
pub struct UndoScheduler<'w, E: Event + Clone> {
counter: ResMut<'w, UndoCounter>,
reserve: ResMut<'w, UndoReservedArea<E>>,
reserve_counter: ResMut<'w, ReserveCounter>,
undo_writer: EventWriter<'w, UndoEvent<E>>,
reserve_writer: EventWriter<'w, RequestCommitReservationsFromSchedulerEvent>,
}
impl<'w, E: Event + Clone> UndoScheduler<'w, E> {
/// Register the undo-event　in the registered area.
///
/// Events can registered multiple, and when [`UndoRequester::undo`](crate::request::UndoRequester) is called,
/// last registered will sent
#[inline(always)]
pub fn register(&mut self, event: E) {
self.counter.increment();
self.undo_writer.send(UndoEvent {
inner: event,
no: **self.counter,
});
}
/// Place the undo-event in the reserved area.
///
/// Events is in placed on same reserved area until [`reserve_commit`](UndoScheduler::register_all_reserved) is called.
///
///
/// This method is useful when want to sent multiple undo-event with single call [`UndoRequest::undo`](crate::request::UndoRequester) .
#[inline]
pub fn reserve(&mut self, event: E) {
self.reserve_counter.increment();
self.reserve.push(UndoReserveEvent {
inner: event,
reserve_no: **self.reserve_counter,
});
}
/// Moves all events placed on the reserved area by [`reserve`](UndoScheduler::reserve) to the registered area.
#[inline]
pub fn register_all_reserved(&mut self) {
self.reserve_writer.send(RequestCommitReservationsFromSchedulerEvent);
}
}
impl<'w, E: Event + Clone + Default> UndoScheduler<'w, E> {
/// Register the undo-event　in the registered area with default value.
///
/// Events can registered multiple, and when [`UndoRequester::undo`](crate::request::UndoRequester) is called,
/// last registered will sent
#[inline(always)]
pub fn register_default(&mut self) {
self.register(E::default());
}
/// Place the undo-event in the reserved area with default value.
///
/// Events is in placed on same reserved area until [`reserve_commit`](UndoScheduler::register_all_reserved) is called.
///
///
/// This method is useful when want to sent multiple undo-event with single call [`UndoRequest::undo`](crate::request::UndoRequester) .
#[inline(always)]
pub fn reserve_default(&mut self) {
self.reserve(E::default());
}
}