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d59ca5c83a
* We will likely use it for other things in the future * Based on Vector's implementation * Also do not get toc element twice
25 lines
724 B
JavaScript
25 lines
724 B
JavaScript
/**
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* Create an observer for showing/hiding feature and for firing scroll event hooks.
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* Based on Vector
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*
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* @param {Function} show functionality for when feature is visible
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* @param {Function} hide functionality for when feature is hidden
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* @return {IntersectionObserver}
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*/
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function initScrollObserver( show, hide ) {
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/* eslint-disable-next-line compat/compat */
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return new IntersectionObserver( ( entries ) => {
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if ( !entries[ 0 ].isIntersecting && entries[ 0 ].boundingClientRect.top < 0 ) {
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// Viewport has crossed the bottom edge of the target element.
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show();
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} else {
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// Viewport is above the bottom edge of the target element.
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hide();
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}
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} );
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}
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module.exports = {
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initScrollObserver
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};
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