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https://github.com/element-hq/element-web.git
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47380306c2
Previously we were creating a notification state whenever we needed one, which was leading to hundreds of listeners even on a small account. To ease the burden, and reduce the load of having to wake so many listeners, we now record a single listener for each tag ID and room combination. This commit also introduces a number of utilities to make future notification work a bit of an easier transition, such as the `isX` and `hasX` getters on the new NotificationState abstract class. Similarly, "snapshots" have been added to reduce code duplication between different kinds of states checking for updates. The ListNotificationState is now heavily tied into the store which offers it to help reuse the cache of room notification states. Fixes https://github.com/vector-im/riot-web/issues/14370
87 lines
2.6 KiB
TypeScript
87 lines
2.6 KiB
TypeScript
/*
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Copyright 2020 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import { EventEmitter } from "events";
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import { NotificationColor } from "./NotificationColor";
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import { IDestroyable } from "../../utils/IDestroyable";
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export const NOTIFICATION_STATE_UPDATE = "update";
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export abstract class NotificationState extends EventEmitter implements IDestroyable {
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protected _symbol: string;
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protected _count: number;
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protected _color: NotificationColor;
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public get symbol(): string {
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return this._symbol;
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}
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public get count(): number {
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return this._count;
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}
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public get color(): NotificationColor {
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return this._color;
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}
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public get isIdle(): boolean {
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return this.color <= NotificationColor.None;
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}
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public get isUnread(): boolean {
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return this.color >= NotificationColor.Bold;
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}
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public get hasUnreadCount(): boolean {
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return this.color >= NotificationColor.Grey && (!!this.count || !!this.symbol);
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}
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public get hasMentions(): boolean {
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return this.color >= NotificationColor.Red;
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}
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protected emitIfUpdated(snapshot: NotificationStateSnapshot) {
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if (snapshot.isDifferentFrom(this)) {
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this.emit(NOTIFICATION_STATE_UPDATE);
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}
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}
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protected snapshot(): NotificationStateSnapshot {
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return new NotificationStateSnapshot(this);
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}
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public destroy(): void {
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this.removeAllListeners(NOTIFICATION_STATE_UPDATE);
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}
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}
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export class NotificationStateSnapshot {
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private readonly symbol: string;
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private readonly count: number;
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private readonly color: NotificationColor;
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constructor(state: NotificationState) {
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this.symbol = state.symbol;
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this.count = state.count;
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this.color = state.color;
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}
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public isDifferentFrom(other: NotificationState): boolean {
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const before = {count: this.count, symbol: this.symbol, color: this.color};
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const after = {count: other.count, symbol: other.symbol, color: other.color};
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return JSON.stringify(before) !== JSON.stringify(after);
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}
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}
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