31 lines
993 B
TypeScript
31 lines
993 B
TypeScript
import { useRef } from '../lib/teact/teact';
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import usePrevious from './usePrevious';
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import useForceUpdate from './useForceUpdate';
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import useOnChange from './useOnChange';
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export default function usePrevForAnimation(current: any, duration?: number) {
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const prev = usePrevious(current, true);
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const timeoutRef = useRef<number>();
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const forceUpdate = useForceUpdate();
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// eslint-disable-next-line no-null/no-null
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const isCurrentPresent = current !== undefined && current !== null;
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if (isCurrentPresent && timeoutRef.current) {
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clearTimeout(timeoutRef.current);
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timeoutRef.current = undefined;
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}
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useOnChange(() => {
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// When `current` becomes empty
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if (duration && !isCurrentPresent && prev && !timeoutRef.current) {
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timeoutRef.current = window.setTimeout(() => {
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timeoutRef.current = undefined;
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forceUpdate();
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}, duration);
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}
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}, [current]);
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return !timeoutRef.current || !duration || isCurrentPresent ? current : prev;
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}
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