T45c Site · Home: full screen stops the glide at once, a starting gallery leaves the host's focus alone, a focused frame stays mounted

frontend/src/scroll.ts

@@ -0,0 +1,18 @@
+import Lenis from "lenis";
+import "lenis/dist/lenis.css";
+
+let lenis: Lenis | null = null;
+
+/** Smooth scroll for the page; the returned call ends it. */
+export function smooth(): { lenis: Lenis; end: () => void } {
+  if (lenis) throw new Error("scroll: smooth scroll already runs");
+  const own = new Lenis({ autoRaf: true });
+  lenis = own;
+  return { lenis: own, end: () => (own.destroy(), (lenis = null)) };
+}
+
+/** Holds the page still at once, a glide in flight included. */
+export function hold(still: boolean): void {
+  if (still) lenis?.stop();
+  else lenis?.start();
+}