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Cookbook auto-fold: capture-phase scroll listener catches hwfit-list

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IntersectionObserver missed the case because scrolling inside the
nested .hwfit-list (max-height:52vh own scroller) doesn't move the
header out of view at all. The user wants any downward scroll in
the scan/download area to fold Direct Download.

Switched to a capture-phase scroll listener on #cookbook-modal that
catches every scroll event from any nested scroller (.hwfit-list,
.cookbook-body, .modal-content). Folds only on downward scrolls so
scrolling back up doesn't keep re-folding.
This commit is contained in:
pewdiepie-archdaemon
2026-06-13 20:10:46 +09:00
parent 74e563dabc
commit e630605aef
1 changed files with 19 additions and 21 deletions
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static/js/cookbook.js
+19 -21
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@@ -1415,29 +1415,27 @@ function _wireTabEvents(body) {
const folded = dlFoldBody.style.display === 'none';
_setFolded(!folded);
});
// Auto-fold when the user scrolls past the Direct Download header.
// Use IntersectionObserver — fires whenever the header element
// crosses the viewport edge, regardless of which scroll container
// moved (cookbook-body, modal-content, hwfit-list, viewport, etc).
// Doesn't auto-unfold; the chevron ▸ still expands manually.
let _ioPrimed = false;
const _io = new IntersectionObserver((entries) => {
const entry = entries[0];
if (!entry) return;
// Skip the initial firing where the header is already in view.
if (!_ioPrimed) {
_ioPrimed = true;
if (entry.isIntersecting) return;
}
if (entry.isIntersecting) return;
// Only fold when scrolled ABOVE the viewport (not when the modal
// closes / detaches under it). boundingClientRect.top < 0 means
// the header was pushed off the top.
if (entry.boundingClientRect.top >= 0) return;
// Auto-fold when the user scrolls inside any scroll container —
// the outer cookbook-body / modal-content (which moves the header
// out of view) OR the nested hwfit results list (which doesn't
// move the header but signals the user is now focused on results).
// Doesn't auto-unfold; chevron ▸ still expands manually.
const _maybeFold = () => {
if (dlFoldBody.style.display === 'none') return;
_setFolded(true, /* persist */ false);
}, { threshold: 0 });
_io.observe(dlFold);
};
// Catch every scroll event anywhere inside the cookbook modal
// (capture phase so even non-bubbling scrolls on nested scrollers
// like .hwfit-list hit us).
const _modal = dlFold.closest('#cookbook-modal') || document;
let _lastY = 0;
_modal.addEventListener('scroll', (e) => {
// Only fold on scroll DOWN — ignore upward / horizontal scrolls.
const tgt = e.target;
const y = (tgt && typeof tgt.scrollTop === 'number') ? tgt.scrollTop : 0;
if (y > _lastY) _maybeFold();
_lastY = y;
}, true);
}
const hfToggle = document.getElementById('cookbook-hf-latest-toggle');
const hfArrow = document.getElementById('cookbook-hf-latest-arrow');