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Some users prefer reduced motion, so this disables chat effects when such a preference is set in the browser or OS.
46 lines
1.5 KiB
TypeScript
46 lines
1.5 KiB
TypeScript
/*
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Copyright 2021 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 SettingController from "./SettingController";
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import { SettingLevel } from "../SettingLevel";
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/**
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* For animation-like settings, this controller checks whether the user has
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* indicated they prefer reduced motion via browser or OS level settings.
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* If they have, this forces the setting value to false.
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*/
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export default class ReducedMotionController extends SettingController {
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public getValueOverride(
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level: SettingLevel,
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roomId: string,
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calculatedValue: any,
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calculatedAtLevel: SettingLevel,
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): any {
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if (this.prefersReducedMotion()) {
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return false;
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}
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return null; // no override
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}
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public get settingDisabled(): boolean {
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return this.prefersReducedMotion();
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}
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private prefersReducedMotion(): boolean {
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return window.matchMedia("(prefers-reduced-motion: reduce)").matches;
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}
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}
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