50 lines
1.2 KiB
JavaScript
50 lines
1.2 KiB
JavaScript
// @flow
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import React from 'react';
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const useEffectOnce = effect => {
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React.useEffect(effect, []);
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};
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function useUnmount(fn: () => any): void {
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const fnRef = React.useRef(fn);
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// update the ref each render so if it change the newest callback will be invoked
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fnRef.current = fn;
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useEffectOnce(() => () => fnRef.current());
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}
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export function useThrottle(value: string, ms: number = 200) {
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const [state, setState] = React.useState(value);
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const timeout = React.useRef();
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const nextValue = React.useRef(null);
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const hasNextValue = React.useRef(0);
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React.useEffect(() => {
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if (!timeout.current) {
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setState(value);
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const timeoutCallback = () => {
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if (hasNextValue.current) {
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hasNextValue.current = false;
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setState(nextValue.current);
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timeout.current = setTimeout(timeoutCallback, ms);
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} else {
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timeout.current = undefined;
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}
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};
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timeout.current = setTimeout(timeoutCallback, ms);
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} else {
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nextValue.current = value;
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hasNextValue.current = true;
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}
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}, [value]);
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useUnmount(() => {
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timeout.current && clearTimeout(timeout.current);
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});
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return state;
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}
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export default useThrottle;
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