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Preserve explicit carousel tab selections #4

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Preserve explicit carousel tab selections #4

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23 changes: 22 additions & 1 deletion index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -191,6 +191,22 @@ <h2 class="section-title">Contact</h2>
var reduceMotion = window.matchMedia && window.matchMedia('(prefers-reduced-motion: reduce)').matches;
var scrollDebounce = null;
var lastScrollIndex = -1;
var programmaticScrollIndex = null;
var programmaticScrollTimer = null;

function clearProgrammaticScroll() {
programmaticScrollIndex = null;
if (programmaticScrollTimer) {
clearTimeout(programmaticScrollTimer);
programmaticScrollTimer = null;
}
}

function markProgrammaticScroll(index) {
programmaticScrollIndex = index;
if (programmaticScrollTimer) clearTimeout(programmaticScrollTimer);
programmaticScrollTimer = window.setTimeout(clearProgrammaticScroll, 1000);
}

function indexFromCenter() {
if (!carousel) return 0;
Expand Down Expand Up @@ -251,6 +267,7 @@ <h2 class="section-title">Contact</h2>
}

if (!fromScroll) {
markProgrammaticScroll(index);
scrollTabToCenter(index);
}

Expand All @@ -264,6 +281,10 @@ <h2 class="section-title">Contact</h2>
if (scrollDebounce) clearTimeout(scrollDebounce);
scrollDebounce = setTimeout(function () {
scrollDebounce = null;
if (programmaticScrollIndex !== null) {
clearProgrammaticScroll();
return;
}
var idx = indexFromCenter();
if (idx === lastScrollIndex) return;
setActive(idx, false, true);
Expand Down Expand Up @@ -314,7 +335,7 @@ <h2 class="section-title">Contact</h2>
tabs.forEach(function (t, i) {
if (t.classList.contains('is-active')) initialIndex = i;
});
setActive(initialIndex, false, false);
setActive(initialIndex, false, true);
})();
</script>
</body>
Expand Down