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export const calculateTop = (boundingRect, outerHeight) => {
const windowHeight = window.innerHeight;
const bottomOverflow = windowHeight - (boundingRect.top + outerHeight);
return bottomOverflow < 0 ? (boundingRect.top - outerHeight) + boundingRect.height :
boundingRect.top;
};
export default () => {
$('.sidebar-top-level-items > li:not(.active)').on('mouseover', (e) => {
const $this = e.currentTarget;
const $subitems = $('.sidebar-sub-level-items', $this).show();
if ($subitems.length) {
const boundingRect = $this.getBoundingClientRect();
const top = calculateTop(boundingRect, $subitems.outerHeight());
const isAbove = top < boundingRect.top;
$subitems.css({
transform: `translate3d(0, ${top}px, 0)`,
});
if (isAbove) {
$subitems.addClass('is-above');
}
}
}).on('mouseout', e => $('.sidebar-sub-level-items', e.currentTarget).hide().removeClass('is-above'));
};
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