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update header animation

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ClovertaTheTrilobita 2026-09-17 12:12:43 +08:00
parent dd695c8237
commit 6e4cd96114
1 changed files with 50 additions and 3 deletions
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53
src/components/Header.astro
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@ -118,7 +118,8 @@ const t = getTranslations(lang);
transition: transform 0.3s ease;
}
.header-slot.is-exiting .site-header {
.header-slot.is-scroll-hidden .site-header,
.header-slot.is-footer-hidden .site-header {
transform: translateY(calc(-100% - 0.5rem));
}
@ -206,6 +207,7 @@ const t = getTranslations(lang);
<script>
const desktopHeaderQuery = window.matchMedia("(min-width: 769px)");
const HEADER_SCROLL_DISTANCE = 120;
const DIRECTION_TRIGGER_DISTANCE = 6;
const headerStyleProperties = [
"--header-width",
"--header-offset",
@ -246,6 +248,9 @@ const t = getTranslations(lang);
let headerFrame = 0;
let headerMetrics: HeaderMetrics | null = null;
let footerDividerObserver: IntersectionObserver | null = null;
let lastScrollY = window.scrollY;
let scrollDirection = 0;
let directionDistance = 0;
const lerp = (start: number, end: number, progress: number) =>
start + (end - start) * progress;
@ -291,6 +296,8 @@ const t = getTranslations(lang);
const header = document.querySelector<HTMLElement>(".site-header");
if (!header) return;
updateScrollVisibility(header.parentElement, window.scrollY);
if (!desktopHeaderQuery.matches) {
clearHeaderStyles(header);
header.parentElement?.style.removeProperty("--header-slot-height");
@ -369,6 +376,40 @@ const t = getTranslations(lang);
});
}
function updateScrollVisibility(
slot: HTMLElement | null,
currentScrollY: number,
) {
if (!slot) return;
const delta = currentScrollY - lastScrollY;
lastScrollY = currentScrollY;
if (
!desktopHeaderQuery.matches ||
currentScrollY <= HEADER_SCROLL_DISTANCE
) {
slot.classList.remove("is-scroll-hidden");
scrollDirection = 0;
directionDistance = 0;
return;
}
if (Math.abs(delta) < 0.5) return;
const nextDirection = Math.sign(delta);
if (nextDirection !== scrollDirection) {
scrollDirection = nextDirection;
directionDistance = 0;
}
directionDistance += Math.abs(delta);
if (directionDistance < DIRECTION_TRIGGER_DISTANCE) return;
slot.classList.toggle("is-scroll-hidden", scrollDirection > 0);
directionDistance = 0;
}
function requestHeaderUpdate() {
if (headerFrame) return;
@ -389,12 +430,12 @@ const t = getTranslations(lang);
if (!slot) return;
slot.classList.remove("is-exiting");
slot.classList.remove("is-footer-hidden");
if (!desktopHeaderQuery.matches || !footerDivider) return;
footerDividerObserver = new IntersectionObserver(([entry]) => {
slot.classList.toggle("is-exiting", entry.isIntersecting);
slot.classList.toggle("is-footer-hidden", entry.isIntersecting);
});
footerDividerObserver.observe(footerDivider);
}
@ -410,6 +451,12 @@ const t = getTranslations(lang);
});
document.addEventListener("astro:page-load", () => {
headerMetrics = null;
lastScrollY = window.scrollY;
scrollDirection = 0;
directionDistance = 0;
document
.querySelector<HTMLElement>(".header-slot")
?.classList.remove("is-scroll-hidden");
updateHeaderState();
bindFooterDividerObserver();
});