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Add swipe and keyboard navigation to the pure image zoom overlay

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Arrow keys and touch swipe now navigate between plates while the
zoom is open, keeping the lightbox in sync underneath. goToZoomSlide
clamps to list bounds and delegates to goToSlide for thumb/index sync.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Sebastian Krüger
2026-06-07 14:52:05 +02:00
parent 3b359d2b37
commit be24904b78
1 changed files with 22 additions and 2 deletions
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static/js/app.js
+22 -2
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@@ -212,6 +212,7 @@
let lbBuilt = false;
let lbReferrer = null; // URL to return to on close
let imgZoomOpen = false;
let imgZoomIdx = -1;
function lbOpen(slug, scopedList) {
lbList = scopedList || POSTS;
@@ -350,8 +351,8 @@
document.addEventListener('keydown', e => {
if (lb.dataset.open !== 'true') return;
if (e.key === 'Escape') { if (imgZoomOpen) closeImgZoom(); else lbClose(); }
if (e.key === 'ArrowLeft') { e.preventDefault(); goToSlide(lbIdx - 1); }
if (e.key === 'ArrowRight') { e.preventDefault(); goToSlide(lbIdx + 1); }
if (e.key === 'ArrowLeft') { e.preventDefault(); imgZoomOpen ? goToZoomSlide(imgZoomIdx - 1) : goToSlide(lbIdx - 1); }
if (e.key === 'ArrowRight') { e.preventDefault(); imgZoomOpen ? goToZoomSlide(imgZoomIdx + 1) : goToSlide(lbIdx + 1); }
});
// Touch swipe
@@ -477,6 +478,7 @@
function openImgZoom(src) {
if (!imgZoom || !imgZoomImg || !src) return;
imgZoomImg.src = src;
imgZoomIdx = lbIdx;
imgZoom.dataset.open = 'true';
imgZoomOpen = true;
document.body.style.overflow = 'hidden';
@@ -489,6 +491,14 @@
if (!lb || lb.dataset.open !== 'true') document.body.style.overflow = '';
}
function goToZoomSlide(idx) {
if (!lbList.length || !imgZoomImg) return;
imgZoomIdx = Math.max(0, Math.min(idx, lbList.length - 1));
const p = lbList[imgZoomIdx];
if (p) imgZoomImg.src = p.card || p.thumb || '';
goToSlide(imgZoomIdx);
}
// Hero "View full image" button
const viewFullBtn = document.getElementById('viewFull');
if (viewFullBtn) {
@@ -505,6 +515,16 @@
if (imgZoom) {
imgZoom.addEventListener('click', e => { if (e.target === imgZoom) closeImgZoom(); });
document.getElementById('imgZoomClose')?.addEventListener('click', closeImgZoom);
// Swipe to navigate
let zoomTouchX = null;
imgZoom.addEventListener('touchstart', e => { zoomTouchX = e.touches[0].clientX; }, { passive: true });
imgZoom.addEventListener('touchend', e => {
if (zoomTouchX === null) return;
const dx = e.changedTouches[0].clientX - zoomTouchX;
if (Math.abs(dx) > 50) dx < 0 ? goToZoomSlide(imgZoomIdx + 1) : goToZoomSlide(imgZoomIdx - 1);
zoomTouchX = null;
});
}
// Escape when lightbox is NOT open (standalone zoom)