107 lines
2.6 KiB
JavaScript
107 lines
2.6 KiB
JavaScript
const config = require("./config/config");
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/**
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* Class to hold information related to a whiteboard
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*/
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class WhiteboardServerSideInfo {
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static defaultScreenResolution = { w: 1000, h: 1000 };
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/**
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* @type {number}
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* @private
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*/
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#nbConnectedUsers = 0;
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get nbConnectedUsers() {
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return this.#nbConnectedUsers;
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}
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/**
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* @type {Map<int, {w: number, h: number}>}
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* @private
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*/
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#screenResolutionByClients = new Map();
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get screenResolutionByClients() {
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return this.#screenResolutionByClients;
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}
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/**
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* Variable to tell if these info have been sent or not
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*
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* @private
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* @type {boolean}
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*/
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#hasNonSentUpdates = false;
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get hasNonSentUpdates() {
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return this.#hasNonSentUpdates;
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}
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incrementNbConnectedUsers() {
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this.#nbConnectedUsers++;
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this.#hasNonSentUpdates = true;
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}
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decrementNbConnectedUsers() {
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this.#nbConnectedUsers--;
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this.#hasNonSentUpdates = true;
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}
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hasConnectedUser() {
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return this.#nbConnectedUsers > 0;
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}
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/**
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* Store information about the client's screen resolution
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*
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* @param {number} clientId
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* @param {number} w client's width
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* @param {number} h client's hight
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*/
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setScreenResolutionForClient(clientId, { w, h }) {
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this.#screenResolutionByClients.set(clientId, { w, h });
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this.#hasNonSentUpdates = true;
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}
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/**
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* Delete the stored information about the client's screen resoltion
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* @param clientId
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*/
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deleteScreenResolutionOfClient(clientId) {
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this.#screenResolutionByClients.delete(clientId);
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this.#hasNonSentUpdates = true;
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}
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/**
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* Get the smallest client's screen size on a whiteboard
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* @return {{w: number, h: number}}
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*/
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getSmallestScreenResolution() {
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const { screenResolutionByClients: resolutions } = this;
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return {
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w: Math.min(...Array.from(resolutions.values()).map((res) => res.w)),
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h: Math.min(...Array.from(resolutions.values()).map((res) => res.h)),
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};
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}
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infoWasSent() {
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this.#hasNonSentUpdates = false;
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}
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shouldSendInfo() {
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return this.#hasNonSentUpdates;
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}
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asObject() {
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const out = {
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nbConnectedUsers: this.#nbConnectedUsers,
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};
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if (config.frontend.showSmallestScreenIndicator) {
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out.smallestScreenResolution = this.getSmallestScreenResolution();
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}
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return out;
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}
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}
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module.exports = WhiteboardServerSideInfo;
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