41 строка
1.3 KiB
JavaScript
41 строка
1.3 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @flow strict-local
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*/
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'use strict';
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import Dimensions from './Dimensions';
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import {type DisplayMetrics} from './NativeDeviceInfo';
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import {useEffect, useState} from 'react';
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export default function useWindowDimensions(): DisplayMetrics {
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const [dimensions, setDimensions] = useState(() => Dimensions.get('window'));
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useEffect(() => {
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function handleChange({window}) {
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if (
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dimensions.width !== window.width ||
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dimensions.height !== window.height ||
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dimensions.scale !== window.scale ||
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dimensions.fontScale !== window.fontScale
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) {
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setDimensions(window);
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}
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}
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Dimensions.addEventListener('change', handleChange);
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// We might have missed an update between calling `get` in render and
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// `addEventListener` in this handler, so we set it here. If there was
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// no change, React will filter out this update as a no-op.
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handleChange({window: Dimensions.get('window')});
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return () => {
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Dimensions.removeEventListener('change', handleChange);
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};
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}, [dimensions]);
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return dimensions;
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}
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