Initial commit

quartz/components/OverflowList.tsx

@@ -0,0 +1,48 @@
+import { JSX } from "preact"
+
+const OverflowList = ({
+  children,
+  ...props
+}: JSX.HTMLAttributes<HTMLUListElement> & { id: string }) => {
+  return (
+    <ul {...props} class={[props.class, "overflow"].filter(Boolean).join(" ")} id={props.id}>
+      {children}
+      <li class="overflow-end" />
+    </ul>
+  )
+}
+
+let numLists = 0
+export default () => {
+  const id = `list-${numLists++}`
+
+  return {
+    OverflowList: (props: JSX.HTMLAttributes<HTMLUListElement>) => (
+      <OverflowList {...props} id={id} />
+    ),
+    overflowListAfterDOMLoaded: `
+document.addEventListener("nav", (e) => {
+  const observer = new IntersectionObserver((entries) => {
+    for (const entry of entries) {
+      const parentUl = entry.target.parentElement
+      if (!parentUl) return
+      if (entry.isIntersecting) {
+        parentUl.classList.remove("gradient-active")
+      } else {
+        parentUl.classList.add("gradient-active")
+      }
+    }
+  })
+
+  const ul = document.getElementById("${id}")
+  if (!ul) return
+
+  const end = ul.querySelector(".overflow-end")
+  if (!end) return
+
+  observer.observe(end)
+  window.addCleanup(() => observer.disconnect())
+})
+`,
+  }
+}