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241e0c12f0
Otherwise the room list badges end up having to listen to `null` for a room ID, meaning they have to filter. The notification badge count setting is the first ever setting to watch based on a room ID, so there are no compatibility concerns with this change.
70 lines
2.7 KiB
JavaScript
70 lines
2.7 KiB
JavaScript
/*
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Copyright 2019 New Vector Ltd.
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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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/**
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* Generalized management class for dealing with watchers on a per-handler (per-level)
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* basis without duplicating code. Handlers are expected to push updates through this
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* class, which are then proxied outwards to any applicable watchers.
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*/
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export class WatchManager {
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_watchers = {}; // { settingName: { roomId: callbackFns[] } }
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// Proxy for handlers to delegate changes to this manager
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watchSetting(settingName, roomId, cb) {
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if (!this._watchers[settingName]) this._watchers[settingName] = {};
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if (!this._watchers[settingName][roomId]) this._watchers[settingName][roomId] = [];
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this._watchers[settingName][roomId].push(cb);
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}
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// Proxy for handlers to delegate changes to this manager
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unwatchSetting(cb) {
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for (const settingName of Object.keys(this._watchers)) {
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for (const roomId of Object.keys(this._watchers[settingName])) {
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let idx;
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while ((idx = this._watchers[settingName][roomId].indexOf(cb)) !== -1) {
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this._watchers[settingName][roomId].splice(idx, 1);
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}
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}
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}
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}
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notifyUpdate(settingName, inRoomId, atLevel, newValueAtLevel) {
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// Dev note: We could avoid raising changes for ultimately inconsequential changes, but
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// we also don't have a reliable way to get the old value of a setting. Instead, we'll just
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// let it fall through regardless and let the receiver dedupe if they want to.
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if (!this._watchers[settingName]) return;
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const roomWatchers = this._watchers[settingName];
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const callbacks = [];
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if (inRoomId !== null && roomWatchers[inRoomId]) {
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callbacks.push(...roomWatchers[inRoomId]);
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}
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if (!inRoomId) {
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// Fire updates to all the individual room watchers too, as they probably
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// care about the change higher up.
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callbacks.push(...Object.values(roomWatchers).reduce((r, a) => [...r, ...a], []));
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} else if (roomWatchers[null]) {
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callbacks.push(...roomWatchers[null]);
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}
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for (const callback of callbacks) {
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callback(inRoomId, atLevel, newValueAtLevel);
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}
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}
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}
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