88 lines
1.9 KiB
TypeScript
88 lines
1.9 KiB
TypeScript
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/**
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* External dependencies
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*/
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import { useRef } from '@wordpress/element';
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/**
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* Internal dependencies
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*/
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import './style.scss';
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interface ScrollToTopProps {
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focusableSelector?: string;
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}
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const maybeScrollToTop = ( scrollPoint: HTMLElement ): void => {
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if ( ! scrollPoint ) {
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return;
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}
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const yPos = scrollPoint.getBoundingClientRect().bottom;
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const isScrollPointVisible = yPos >= 0 && yPos <= window.innerHeight;
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if ( ! isScrollPointVisible ) {
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scrollPoint.scrollIntoView();
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}
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};
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const moveFocusToElement = (
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scrollPoint: HTMLElement,
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focusableSelector: string
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): void => {
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const focusableElements =
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scrollPoint.parentElement?.querySelectorAll( focusableSelector ) || [];
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if ( focusableElements.length ) {
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const targetElement = focusableElements[ 0 ] as HTMLElement;
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maybeScrollToTop( targetElement );
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targetElement?.focus();
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} else {
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maybeScrollToTop( scrollPoint );
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}
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};
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const scrollToHTMLElement = (
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scrollPoint: HTMLElement,
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options: ScrollToTopProps
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): void => {
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const { focusableSelector } = options || {};
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if ( ! window || ! Number.isFinite( window.innerHeight ) ) {
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return;
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}
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if ( focusableSelector ) {
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moveFocusToElement( scrollPoint, focusableSelector );
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} else {
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maybeScrollToTop( scrollPoint );
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}
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};
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/**
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* HOC that provides a function to scroll to the top of the component.
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*/
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const withScrollToTop = (
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OriginalComponent: React.FunctionComponent< Record< string, unknown > >
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) => {
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return ( props: Record< string, unknown > ): JSX.Element => {
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const scrollPointRef = useRef< HTMLDivElement >( null );
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const scrollToTop = ( args: ScrollToTopProps ) => {
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if ( scrollPointRef.current !== null ) {
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scrollToHTMLElement( scrollPointRef.current, args );
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}
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};
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return (
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<>
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<div
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className="with-scroll-to-top__scroll-point"
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ref={ scrollPointRef }
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aria-hidden
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/>
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<OriginalComponent { ...props } scrollToTop={ scrollToTop } />
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</>
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);
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};
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};
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export default withScrollToTop;
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