66 lines
2.0 KiB
TypeScript
66 lines
2.0 KiB
TypeScript
 
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/*
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Copyright 2026 Lotus Guild
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SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
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Please see LICENSE in the repository root for full details.
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*/
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/**
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* [element-call #36] Remember the per-participant volume slider across calls,
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* reloads and reconnects. Keyed by Matrix user id (not device), so "Bob is
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* loud" sticks when Bob switches devices. Local to this browser, never synced.
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* Only voice is remembered; screenshare audio stays per-share.
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*/
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const STORAGE_KEY = "lotus-per-user-volume";
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/** Most recently set entries kept; older ones are dropped. */
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export const MAX_REMEMBERED = 50;
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type VolumeMap = Record<string, number>;
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const isVolume = (v: unknown): v is number =>
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typeof v === "number" && Number.isFinite(v) && v >= 0 && v <= 4;
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function load(): VolumeMap {
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try {
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const raw = localStorage.getItem(STORAGE_KEY);
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if (!raw) return {};
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const parsed: unknown = JSON.parse(raw);
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if (typeof parsed !== "object" || parsed === null) return {};
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const out: VolumeMap = {};
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for (const [k, v] of Object.entries(parsed)) if (isVolume(v)) out[k] = v;
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return out;
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} catch {
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return {};
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}
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}
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function save(map: VolumeMap): void {
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try {
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localStorage.setItem(STORAGE_KEY, JSON.stringify(map));
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} catch {
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// Storage unavailable (private mode, quota): the slider just won't stick.
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}
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}
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/** The remembered volume for `userId`, or 1 (100 %) if none. */
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export function getRememberedVolume(userId: string): number {
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return load()[userId] ?? 1;
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}
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/**
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* Remember `volume` for `userId`. 1 (the default) forgets the entry. The entry
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* moves to the end so the map is in least-recently-set order, trimmed to
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* MAX_REMEMBERED.
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*/
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export function rememberVolume(userId: string, volume: number): void {
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if (!isVolume(volume)) return;
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const map = load();
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delete map[userId];
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if (volume !== 1) map[userId] = volume;
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const keys = Object.keys(map);
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for (const k of keys.slice(0, Math.max(0, keys.length - MAX_REMEMBERED)))
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delete map[k];
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save(map);
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}
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