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Cookbook: auto-fold Direct Download when its header scrolls past top

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Added a scroll listener on the parent .modal-body / cookbook-content
that folds the Direct Download body once its h2 header has scrolled
above the container's top edge. Frees the viewport for the Scan
section below while leaving the chevron clickable to expand again.

Auto-fold doesn't write to localStorage (only manual clicks do)
so the user's last explicit preference still wins on reload.
This commit is contained in:
pewdiepie-archdaemon
2026-06-13 20:03:14 +09:00
parent a615f7f786
commit d68c75a82c
1 changed files with 25 additions and 7 deletions
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static/js/cookbook.js
+25 -7
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@@ -1403,16 +1403,34 @@ function _wireTabEvents(body) {
const dlFoldBody = document.getElementById('cookbook-dl-tab-fold-body');
const dlFoldChevron = document.getElementById('cookbook-dl-tab-chevron');
if (dlFold && dlFoldBody && dlFoldChevron) {
const _setFolded = (folded, persist = true) => {
dlFoldBody.style.display = folded ? 'none' : '';
dlFoldChevron.textContent = folded ? '▸' : '▾';
dlFold.classList.toggle('is-folded', folded);
if (persist) {
try { localStorage.setItem('cookbook_dl_tab_folded_v1', folded ? '1' : '0'); } catch {}
}
};
dlFold.addEventListener('click', () => {
const folded = dlFoldBody.style.display === 'none';
dlFoldBody.style.display = folded ? '' : 'none';
dlFoldChevron.textContent = folded ? '▾' : '▸';
// Toggle is-folded class on the h2 so the line under it only shows when
// the section is collapsed (the body's content normally provides
// separation; with no body visible, the line gives the h2 definition).
dlFold.classList.toggle('is-folded', !folded);
try { localStorage.setItem('cookbook_dl_tab_folded_v1', folded ? '0' : '1'); } catch {}
_setFolded(!folded);
});
// Auto-fold when the user scrolls past the Direct Download header.
// Watches the header element: once its bottom edge passes above the
// scroll container's top, fold the body so the scan section below has
// the full viewport. Doesn't auto-unfold (user can click ▸ to expand).
const _scrollHost = dlFold.closest('.modal-body, .cookbook-content, .doclib-modal-content') || document.scrollingElement || document.body;
let _autoFolded = false;
const _onScroll = () => {
if (dlFoldBody.style.display === 'none') return;
const r = dlFold.getBoundingClientRect();
const top = (_scrollHost && _scrollHost.getBoundingClientRect) ? _scrollHost.getBoundingClientRect().top : 0;
if (r.bottom < top + 4) {
_autoFolded = true;
_setFolded(true, /* persist */ false);
}
};
_scrollHost.addEventListener('scroll', _onScroll, { passive: true });
}
const hfToggle = document.getElementById('cookbook-hf-latest-toggle');
const hfArrow = document.getElementById('cookbook-hf-latest-arrow');