110 lines
3.4 KiB
TypeScript
110 lines
3.4 KiB
TypeScript
import {User} from "./User";
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import {PositionInterface} from "_Model/PositionInterface";
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import {Movable} from "./Movable";
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import {Group} from "./Group";
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export type EntersCallback = (thing: Movable, listener: User) => void;
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export type MovesCallback = (thing: Movable, position: PositionInterface, listener: User) => void;
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export type LeavesCallback = (thing: Movable, listener: User) => void;
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export class Zone {
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private things: Set<Movable> = new Set<Movable>();
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private listeners: Set<User> = new Set<User>();
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/**
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* @param x For debugging purpose only
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* @param y For debugging purpose only
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*/
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constructor(private onEnters: EntersCallback, private onMoves: MovesCallback, private onLeaves: LeavesCallback, private x: number, private y: number) {
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}
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/**
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* A user/thing leaves the zone
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*/
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public leave(thing: Movable, newZone: Zone|null) {
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const result = this.things.delete(thing);
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if (!result) {
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if (thing instanceof User) {
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throw new Error('Could not find user in zone '+thing.id);
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}
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if (thing instanceof Group) {
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throw new Error('Could not find group '+thing.getId()+' in zone ('+this.x+','+this.y+'). Position of group: ('+thing.getPosition().x+','+thing.getPosition().y+')');
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}
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}
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this.notifyLeft(thing, newZone);
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}
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/**
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* Notify listeners of this zone that this user/thing left
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*/
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private notifyLeft(thing: Movable, newZone: Zone|null) {
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for (const listener of this.listeners) {
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if (listener !== thing && (newZone === null || !listener.listenedZones.has(newZone))) {
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this.onLeaves(thing, listener);
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}
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}
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}
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public enter(thing: Movable, oldZone: Zone|null, position: PositionInterface) {
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this.things.add(thing);
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this.notifyEnter(thing, oldZone, position);
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}
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/**
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* Notify listeners of this zone that this user entered
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*/
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private notifyEnter(thing: Movable, oldZone: Zone|null, position: PositionInterface) {
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for (const listener of this.listeners) {
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if (listener === thing) {
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continue;
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}
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if (oldZone === null || !listener.listenedZones.has(oldZone)) {
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this.onEnters(thing, listener);
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} else {
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this.onMoves(thing, position, listener);
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}
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}
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}
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public move(thing: Movable, position: PositionInterface) {
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if (!this.things.has(thing)) {
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this.things.add(thing);
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this.notifyEnter(thing, null, position);
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return;
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}
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for (const listener of this.listeners) {
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if (listener !== thing) {
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this.onMoves(thing,position, listener);
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}
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}
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}
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public startListening(listener: User): void {
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for (const thing of this.things) {
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if (thing !== listener) {
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this.onEnters(thing, listener);
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}
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}
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this.listeners.add(listener);
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listener.listenedZones.add(this);
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}
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public stopListening(listener: User): void {
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for (const thing of this.things) {
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if (thing !== listener) {
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this.onLeaves(thing, listener);
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}
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}
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this.listeners.delete(listener);
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listener.listenedZones.delete(this);
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}
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public getThings(): Set<Movable> {
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return this.things;
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}
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}
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