mirror of
https://github.com/vector-im/element-call.git
synced 2024-11-30 00:50:48 +08:00
42 lines
1.5 KiB
TypeScript
42 lines
1.5 KiB
TypeScript
/*
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Copyright 2024 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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import { useLayoutEffect, useRef } from "react";
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import { useUrlParams } from "./UrlParams";
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export const useTheme = (): void => {
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const { theme: themeName } = useUrlParams();
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const previousTheme = useRef<string | null>(document.body.classList.item(0));
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useLayoutEffect(() => {
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// Don't update the current theme if the url does not contain a theme prop.
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if (!themeName) return;
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const theme = themeName.includes("light") ? "light" : "dark";
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const themeHighContrast = themeName.includes("high-contrast") ? "-hc" : "";
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const themeString = "cpd-theme-" + theme + themeHighContrast;
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if (themeString !== previousTheme.current) {
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document.body.classList.remove(
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"cpd-theme-light",
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"cpd-theme-dark",
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"cpd-theme-light-hc",
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"cpd-theme-dark-hc",
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);
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document.body.classList.add(themeString);
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previousTheme.current = themeString;
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}
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}, [previousTheme, themeName]);
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};
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