#9 implement entity add/remove events

src/events/internal-events.ts

@@ -1,10 +1,20 @@
 import type {ISystem} from "../system/system.spec.ts";
 import type {TObjectProto} from "../_.spec.ts";
-import type {IIStateProto, IState} from "../state/state.spec.ts";
+import type {IState} from "../state/state.spec.ts";
+import type {IEntity} from "../entity/entity.spec.ts";
 
 
 export class SimECSEvent {}
 
+class SimECSEntityEvent extends SimECSEvent {
+    constructor(
+        public readonly entity: Readonly<IEntity>,
+    ) { super() }
+}
+
+export class SimECSEntityAddEvent extends SimECSEntityEvent {}
+export class SimECSEntityRemoveEvent extends SimECSEntityEvent {}
+
 class SimECSPDAEvent extends SimECSEvent {
     constructor(
         public readonly state: Readonly<IState> | undefined,

src/world/runtime/runtime-world_entities.ts

@@ -1,6 +1,7 @@
 import {type RuntimeWorld} from "./runtime-world.ts";
 import type {IEntity} from "../../entity/entity.spec.ts";
 import {addEntitySym, removeEntitySym} from "../../query/_.ts";
+import {SimECSEntityAddEvent, SimECSEntityRemoveEvent} from "../../events/internal-events.ts";
 
 export function addEntity(this: RuntimeWorld, entity: Readonly<IEntity>): void {
     this.data.entities.add(entity);
@@ -11,6 +12,9 @@ export function addEntity(this: RuntimeWorld, entity: Readonly<IEntity>): void {
             query[addEntitySym](entity);
         }
     }
+
+    // todo: await in 0.7.0
+    this.eventBus.publish(new SimECSEntityAddEvent(entity));
 }
 
 export function hasEntity(this: RuntimeWorld, entity: Readonly<IEntity>): boolean {
@@ -26,4 +30,7 @@ export function removeEntity(this: RuntimeWorld, entity: Readonly<IEntity>): voi
             query[removeEntitySym](entity);
         }
     }
+
+    // todo: await in 0.7.0
+    this.eventBus.publish(new SimECSEntityRemoveEvent(entity));
 }