snapshot of https://github.com/shadcn-ui/ui.git (main, 2026-09-15; blobs > 131072B omitted)

apps/v4/lib/docs-sidebar-scroll.ts

@@ -0,0 +1,66 @@
+export const DOCS_SIDEBAR_SCROLL_STORAGE_KEY = "docs-sidebar-scroll"
+
+export const DOCS_SIDEBAR_SCROLL_RESTORE_SCRIPT = `(function () {
+  if (location.pathname !== "/docs" && !location.pathname.startsWith("/docs/")) return
+
+  var stored = null
+  try {
+    stored = JSON.parse(sessionStorage.getItem("${DOCS_SIDEBAR_SCROLL_STORAGE_KEY}"))
+  } catch (e) {}
+
+  function getActiveItem(container) {
+    var items = container.querySelectorAll('[data-active="true"]')
+    var active = null
+    var activePathLength = -1
+    var activeDistance = Infinity
+    var containerCenter = container.getBoundingClientRect().top + container.clientHeight / 2
+
+    for (var i = 0; i < items.length; i++) {
+      var link = items[i].querySelector('a[href]')
+      var href = items[i].getAttribute('href') || (link && link.getAttribute('href'))
+      var pathLength = href ? href.length : 0
+      var itemRect = items[i].getBoundingClientRect()
+      var distance = Math.abs(itemRect.top + itemRect.height / 2 - containerCenter)
+
+      if (pathLength > activePathLength || (pathLength === activePathLength && distance < activeDistance)) {
+        active = items[i]
+        activePathLength = pathLength
+        activeDistance = distance
+      }
+    }
+
+    return active
+  }
+
+  function restoreScroll() {
+    var container = document.querySelector('[data-docs-sidebar-content]')
+    if (!container || !container.clientHeight) return
+
+    if (stored && stored.pathname === location.pathname) {
+      container.scrollTop = stored.scrollTop
+      return
+    }
+
+    var active = getActiveItem(container)
+    if (!active) return
+
+    var containerRect = container.getBoundingClientRect()
+    var activeRect = active.getBoundingClientRect()
+    if (activeRect.top >= containerRect.top && activeRect.bottom <= containerRect.bottom) return
+
+    container.scrollTop += activeRect.top - containerRect.top - (container.clientHeight - activeRect.height) / 2
+  }
+
+  var observer = new MutationObserver(restoreScroll)
+  observer.observe(document.documentElement, { childList: true, subtree: true })
+  restoreScroll()
+
+  if (document.readyState === "loading") {
+    document.addEventListener("DOMContentLoaded", function () {
+      restoreScroll()
+      observer.disconnect()
+    }, { once: true })
+  } else {
+    observer.disconnect()
+  }
+})()`