28 lines
621 B
TypeScript
28 lines
621 B
TypeScript
// Copyright 2022 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { useEffect, useState } from 'react';
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export function useDevicePixelRatio(): number {
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const [result, setResult] = useState(window.devicePixelRatio);
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useEffect(() => {
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const update = () => {
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setResult(window.devicePixelRatio);
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};
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update();
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const mediaQuery = window.matchMedia(
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`screen and (resolution: ${result}dppx)`
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);
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mediaQuery.addEventListener('change', update);
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return () => {
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mediaQuery.removeEventListener('change', update);
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};
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}, [result]);
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return result;
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}
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