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88 lines
2.9 KiB
88 lines
2.9 KiB
3 weeks ago
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import type { BattleEvent, BattleEventListener } from './BattleEvents';
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import { BATTLE_EVENT_ALL, BattleEventType, type BattleEventSubscription } from './BattleEventType';
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import { createMembershipSet, membershipAdd, membershipForEach, type MembershipSet } from '../../../tools/MembershipSet';
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/**
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* 战斗事件总线
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* - 逻辑层 emit，表现层 / UI on 订阅
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* - 默认帧末 flush，减少同帧多次刷新
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*/
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export class BattleEventBus {
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private _listeners = new Map<BattleEventSubscription, MembershipSet<BattleEventListener>>();
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private _pending: BattleEvent[] = [];
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private _immediate = false;
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/** 当前正在派发的事件（监听重入 flush 时压栈恢复） */
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private _event: BattleEvent | null = null;
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/** 单个监听：抛错不影响同帧其余监听（含 UnitSpawned 出怪表现） */
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private readonly _callListener = (fn: BattleEventListener): void => {
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const event = this._event;
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if (!event) return;
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try {
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fn(event);
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} catch (err) {
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console.error('[BattleEventBus] listener', event.type, err);
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}
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};
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/**
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* @param type 事件类型或通配符
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* @param listener 回调
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*/
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on(type: BattleEventSubscription, listener: BattleEventListener): void {
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if (!this._listeners.has(type)) {
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this._listeners.set(type, createMembershipSet());
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}
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membershipAdd(this._listeners.get(type)!, listener);
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}
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/**
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* @param type 事件类型或通配符
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* @param listener 回调
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*/
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off(type: BattleEventSubscription, listener: BattleEventListener): void {
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this._listeners.get(type)?.delete(listener);
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}
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/**
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* @param event 战斗事件
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* @param immediate 是否立即派发（跳过帧末批处理）
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*/
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emit(event: BattleEvent, immediate = false): void {
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if (immediate || this._immediate) {
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this._dispatch(event);
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} else {
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this._pending.push(event);
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}
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}
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/**
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* 派发当前批次。派发中新入队的事件留到下次 flush。
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* 派发中再次 flush 只处理新批次，不得改外层下标。
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*/
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flush(): void {
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const batch = this._pending;
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const n = batch.length;
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if (n === 0) return;
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this._pending = [];
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for (let i = 0; i < n; i++) {
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this._dispatch(batch[i]);
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}
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}
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/** @param enabled 是否启用立即派发模式 */
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setImmediateMode(enabled: boolean): void {
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this._immediate = enabled;
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}
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private _dispatch(event: BattleEvent): void {
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const prev = this._event;
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this._event = event;
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const specific = this._listeners.get(event.type);
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if (specific) membershipForEach(specific, this._callListener);
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const all = this._listeners.get(BATTLE_EVENT_ALL);
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if (all) membershipForEach(all, this._callListener);
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this._event = prev;
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}
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}
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