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document.addEventListener('DOMContentLoaded', () => {
let scrollPending = false;
let lastScrollY = 0;
const threshold = 60;
const headerEl = document.querySelector('.header-5');
const logoEl = document.querySelector('.header-5__popout');
const headerHeight = headerEl?.offsetHeight ?? 0;
window.addEventListener(
'scroll',
() => {
scrollPending = true;
},
{ passive: true }
);
const tick = () => {
if (scrollPending) {
handleScroll();
scrollPending = false;
}
requestAnimationFrame(tick);
};
requestAnimationFrame(tick);
function handleScroll() {
const currentScrollY = window.scrollY;
const isCrossingThreshold =
(lastScrollY < threshold && currentScrollY >= threshold) ||
(lastScrollY >= threshold && currentScrollY < threshold);
const isCrossingHeader =
(lastScrollY < headerHeight && currentScrollY >= headerHeight) ||
(lastScrollY >= headerHeight && currentScrollY < headerHeight);
const isMinorScroll = Math.abs(lastScrollY - currentScrollY) <= 5;
if (isMinorScroll && !isCrossingThreshold && !isCrossingHeader) {
lastScrollY = currentScrollY;
return;
}
if (currentScrollY > headerHeight) {
logoEl?.classList.add('active');
}
if (currentScrollY < threshold) {
logoEl?.classList.remove('active');
}
lastScrollY = currentScrollY;
}
});
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