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docs(demos): keep tour spotlight on its target while scrolling #162

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lesnik512 merged 1 commit into from
Oct 16, 2026
Merged

docs(demos): keep tour spotlight on its target while scrolling #162

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24 changes: 24 additions & 0 deletions docs/demos/engine.js
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Original file line number Diff line number Diff line change
Expand Up @@ -228,7 +228,29 @@ window.HttpwareDemo = (function () {
els.ring.classList.add('show');
return { x0, y0, x1, y1 };
}
let spotNodes = null, frame = 0;
function reposition() {
frame = 0;
if (spotNodes) placeCoach(spotlight(spotNodes));
}
function scheduleReposition() {
if (!frame) frame = requestAnimationFrame(reposition);
}
function follow(nodes) {
if (!spotNodes) {
window.addEventListener('scroll', scheduleReposition, { capture: true, passive: true });
window.addEventListener('resize', scheduleReposition, { passive: true });
}
spotNodes = nodes;
}
function unfollow() {
window.removeEventListener('scroll', scheduleReposition, { capture: true });
window.removeEventListener('resize', scheduleReposition);
cancelAnimationFrame(frame);
spotNodes = null; frame = 0;
}
function hideSpot() {
unfollow();
[els.dimT, els.dimB, els.dimL, els.dimR, els.ring].forEach((n) => n.classList.remove('show'));
}
function placeCoach(hole) {
Expand All @@ -246,6 +268,7 @@ window.HttpwareDemo = (function () {
top = Math.min(Math.max(10, top), H - ch - 10);
c.style.left = left + 'px'; c.style.top = top + 'px';
const a = els.cArrow;
a.style.borderTop = a.style.borderRight = a.style.borderBottom = a.style.borderLeft = '';
a.style.transform = 'rotate(45deg)';
if (side === 'right') { a.style.left = '-7px'; a.style.top = (cy - top - 6) + 'px'; a.style.borderTop = 'none'; a.style.borderRight = 'none'; a.style.borderLeft = '1px solid var(--hw-line)'; a.style.borderBottom = '1px solid var(--hw-line)'; }
else if (side === 'left') { a.style.left = (cw - 7) + 'px'; a.style.top = (cy - top - 6) + 'px'; a.style.borderBottom = 'none'; a.style.borderLeft = 'none'; a.style.borderTop = '1px solid var(--hw-line)'; a.style.borderRight = '1px solid var(--hw-line)'; }
Expand All @@ -265,6 +288,7 @@ window.HttpwareDemo = (function () {
els.cTitle.textContent = stop.title;
els.cBody.textContent = stop.body;
placeCoach(hole);
follow(nodes);
},
hideAll() { els.coach.classList.remove('show'); hideSpot(); },
setContinue(fn) { onContinue = fn; },
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