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import { useScrollToTop } from '@automattic/components';
import { Button } from '@wordpress/components';
import { useCallback, useEffect, useRef } from '@wordpress/element';
import { Icon, arrowUp } from '@wordpress/icons';
import { useI18n } from '@wordpress/react-i18n';
import clsx from 'clsx';
import type { FC } from 'react';
import './back-to-top-button.scss';
export const BackToTopButton: FC = () => {
const elementRef = useRef< HTMLElement | null >( null );
const scrollParentRef = useRef< HTMLElement | null >( null );
const { __ } = useI18n();
useEffect( () => {
if ( elementRef.current ) {
scrollParentRef.current = elementRef.current?.closest( '.help-center__container-content' );
}
}, [ elementRef ] );
const isBelowThreshold = useCallback( ( containerNode: HTMLElement ) => {
const SCROLL_THRESHOLD = 400;
return containerNode.scrollTop > SCROLL_THRESHOLD;
}, [] );
const { isButtonVisible, scrollToTop } = useScrollToTop( {
scrollTargetRef: scrollParentRef,
isBelowThreshold,
smoothScrolling: false,
} );
return (
<Button
ref={ elementRef }
className={ clsx( 'back-to-top-button__help-center', {
'is-visible': isButtonVisible,
} ) }
onClick={ scrollToTop }
>
<Icon icon={ arrowUp } size={ 16 } />
{ __( 'Back to top', __i18n_text_domain__ ) }
</Button>
);
};
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