From 917d5791acd6361c691902b445bdc4f7129ba3fc Mon Sep 17 00:00:00 2001
From: Jacky Zhao <j.zhao2k19@gmail.com>
Date: Sat, 17 Jun 2023 02:41:59 +0000
Subject: [PATCH] modern toc tweaks

---
 quartz/components/TableOfContents.tsx |   69 +++++++++++++++++++++++++++-------
 1 files changed, 55 insertions(+), 14 deletions(-)

diff --git a/quartz/components/TableOfContents.tsx b/quartz/components/TableOfContents.tsx
index 8192da4..afb8388 100644
--- a/quartz/components/TableOfContents.tsx
+++ b/quartz/components/TableOfContents.tsx
@@ -1,24 +1,65 @@
-import { QuartzComponentProps } from "./types"
-import style from "./styles/toc.scss"
+import { QuartzComponentConstructor, QuartzComponentProps } from "./types"
+import legacyStyle from "./styles/legacyToc.scss"
+import modernStyle from "./styles/toc.scss"
 
-export default function TableOfContents({ fileData, position }: QuartzComponentProps) {
-  if (!fileData.toc) {
-    return null
-  }
+interface Options {
+  layout: 'modern' | 'legacy'
+}
 
-  if (position === 'body') {
-    // TODO: animate this
-    return <details className="toc" open>
+const defaultOptions: Options = {
+  layout: 'modern'
+}
+
+export default ((opts?: Partial<Options>) => {
+  const layout = opts?.layout ?? defaultOptions.layout
+  function TableOfContents({ fileData }: QuartzComponentProps) {
+    if (!fileData.toc) {
+      return null
+    }
+
+    return <details class="toc" open>
       <summary><h3>Table of Contents</h3></summary>
       <ul>
-        {fileData.toc.map(tocEntry => <li key={tocEntry.slug} className={`depth-${tocEntry.depth}`}>
-          <a href={`#${tocEntry.slug}`}>{tocEntry.text}</a>
+        {fileData.toc.map(tocEntry => <li key={tocEntry.slug} class={`depth-${tocEntry.depth}`}>
+          <a href={`#${tocEntry.slug}`} data-for={tocEntry.slug}>{tocEntry.text}</a>
         </li>)}
       </ul>
     </details>
-  } else if (position === 'sidebar') {
-    // TODO
   }
+
+  TableOfContents.css = layout === "modern" ? modernStyle : legacyStyle
+
+  if (layout === "modern") {
+    TableOfContents.afterDOMLoaded = `
+const bufferPx = 150
+const observer = new IntersectionObserver(entries => {
+  for (const entry of entries) {
+    const slug = entry.target.id
+    const tocEntryElement = document.querySelector(\`a[data-for="$\{slug\}"]\`)
+    const windowHeight = entry.rootBounds?.height
+    if (windowHeight && tocEntryElement) {
+      if (entry.boundingClientRect.y < windowHeight) {
+        tocEntryElement.classList.add("in-view")
+      } else {
+        tocEntryElement.classList.remove("in-view")
+      }
+    }
+  }
+})
+
+function init() {
+  const headers = document.querySelectorAll("h1[id], h2[id], h3[id], h4[id], h5[id], h6[id]")
+  headers.forEach(header => observer.observe(header))
 }
 
-TableOfContents.css = style
+init()
+
+document.addEventListener("spa_nav", (e) => {
+  observer.disconnect()
+  init()
+})
+`
+  }
+
+  return TableOfContents
+}) satisfies QuartzComponentConstructor

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