feat: read indicator

Signed-off-by: Innei <tukon479@gmail.com>

src/app/notes/[id]/page.tsx

@@ -14,6 +14,7 @@ import { ClientOnly } from '~/components/common/ClientOnly'
 import { PageDataHolder } from '~/components/common/PageHolder'
 import { MdiClockOutline } from '~/components/icons/clock'
 import { useSetHeaderMetaInfo } from '~/components/layout/header/internal/hooks'
+import { Divider } from '~/components/ui/divider'
 import { FloatPopover } from '~/components/ui/float-popover'
 import { Loading } from '~/components/ui/loading'
 import { Markdown } from '~/components/ui/markdown'
@@ -33,6 +34,7 @@ import { NoteLayoutRightSidePortal } from '~/providers/note/right-side-provider'
 import { parseDate } from '~/utils/datetime'
 import { springScrollToTop } from '~/utils/scroller'
 
+import { ReadIndicator } from '../../../components/common/ReadIndicator'
 import { NoteActionAside } from '../../../components/widgets/note/NoteActionAside'
 import { NoteHideIfSecret } from '../../../components/widgets/note/NoteHideIfSecret'
 import { NoteMetaBar } from '../../../components/widgets/note/NoteMetaBar'
@@ -114,6 +116,7 @@ const NotePage = memo(({ note }: { note: NoteModel }) => {
               <TocAside
                 className="sticky top-[120px] ml-4 mt-[120px]"
                 treeClassName="max-h-[calc(100vh-6rem-4.5rem-300px)] h-[calc(100vh-6rem-4.5rem-300px)] min-h-[120px] relative"
+                accessory={NoteReadIndicator}
               >
                 <NoteActionAside className="translate-y-full" />
               </TocAside>
@@ -130,6 +133,14 @@ const NotePage = memo(({ note }: { note: NoteModel }) => {
     </Suspense>
   )
 })
+const NoteReadIndicator = () => {
+  return (
+    <li>
+      <Divider />
+      <ReadIndicator className="text-sm" />
+    </li>
+  )
+}
 
 const NoteTitle = () => {
   const note = useNoteData()

src/components/common/ReadIndicator.tsx

@@ -0,0 +1,28 @@
+/* eslint-disable @typescript-eslint/no-non-null-asserted-optional-chain */
+/* eslint-disable @typescript-eslint/no-non-null-assertion */
+'use client'
+
+import type { ElementType } from 'react'
+
+import {
+  useArticleElementPositsion,
+  useArticleElementSize,
+} from '~/providers/article/article-element-provider'
+import { usePageScrollLocationSelector } from '~/providers/root/page-scroll-info-provider'
+import { clsxm } from '~/utils/helper'
+
+export const ReadIndicator: Component<{
+  as?: ElementType
+}> = ({ className, as }) => {
+  const { y } = useArticleElementPositsion()
+  const { h } = useArticleElementSize()
+  const readPercent = usePageScrollLocationSelector((scrollTop) => {
+    return Math.floor(Math.min(Math.max(0, ((scrollTop - y) / h) * 100), 100))
+  })
+  const As = as || 'span'
+  return (
+    <As className={clsxm('text-gray-800 dark:text-neutral-300', className)}>
+      {readPercent}%
+    </As>
+  )
+}

src/components/widgets/toc/Toc.tsx

@@ -1,6 +1,7 @@
-import { memo, useCallback, useEffect, useMemo, useRef } from 'react'
+import React, { memo, useCallback, useEffect, useMemo, useRef } from 'react'
 import { motion } from 'framer-motion'
 import { atom, useAtom } from 'jotai'
+import type { FC } from 'react'
 import type { ITocItem } from './TocItem'
 
 import { RightToLeftTransitionView } from '~/components/ui/transition/RightToLeftTransitionView'
@@ -15,10 +16,14 @@ export type TocAsideProps = {
   treeClassName?: string
 }
 
-export const TocAside: Component<TocAsideProps> = ({
+interface TocSharedProps {
+  accessory?: React.ReactNode | React.FC
+}
+export const TocAside: Component<TocAsideProps & TocSharedProps> = ({
   className,
   children,
   treeClassName,
+  accessory,
 }) => {
   const containerRef = useRef<HTMLUListElement>(null)
   const $article = useArticleElement()
@@ -91,19 +96,30 @@ export const TocAside: Component<TocAsideProps> = ({
         rootDepth={rootDepth}
         containerRef={containerRef}
         className={clsxm('absolute max-h-[75vh]', treeClassName)}
+        accessory={accessory}
       />
       {children}
     </aside>
   )
 }
 
-const TocTree: Component<{
-  toc: ITocItem[]
-  activeId: string | null
-  setActiveId: (id: string | null) => void
-  rootDepth: number
-  containerRef: React.MutableRefObject<HTMLUListElement | null>
-}> = ({ toc, activeId, setActiveId, rootDepth, containerRef, className }) => {
+const TocTree: Component<
+  {
+    toc: ITocItem[]
+    activeId: string | null
+    setActiveId: (id: string | null) => void
+    rootDepth: number
+    containerRef: React.MutableRefObject<HTMLUListElement | null>
+  } & TocSharedProps
+> = ({
+  toc,
+  activeId,
+  setActiveId,
+  rootDepth,
+  containerRef,
+  className,
+  accessory,
+}) => {
   const handleScrollTo = useCallback(
     (i: number, $el: HTMLElement | null, anchorId: string) => {
       if ($el) {
@@ -134,6 +150,9 @@ const TocTree: Component<{
           />
         )
       })}
+      {React.isValidElement(accessory)
+        ? accessory
+        : React.createElement(accessory as FC)}
     </ul>
   )
 }

src/providers/article/article-element-provider.tsx

@@ -20,6 +20,15 @@ const [
   w: 0,
 })
 
+const [
+  ArticleElementPositsionProviderInternal,
+  useArticleElementPositsion,
+  useSetArticleElementPositsion,
+] = createContextState({
+  x: 0,
+  y: 0,
+})
+
 const [
   IsEOArticleElementProviderInternal,
   useIsEOArticleElement,
@@ -29,6 +38,7 @@ const [
 const Providers = [
   <ArticleElementProviderInternal key="ArticleElementProviderInternal" />,
   <ArticleElementSizeProviderInternal key="ArticleElementSizeProviderInternal" />,
+  <ArticleElementPositsionProviderInternal key="ArticleElementPositsionProviderInternal" />,
   <IsEOArticleElementProviderInternal key="IsEOArticleElementProviderInternal" />,
 ]
 const ArticleElementProvider: Component = ({ children, className }) => {
@@ -41,16 +51,19 @@ const ArticleElementProvider: Component = ({ children, className }) => {
 }
 const ArticleElementResizeObserver = () => {
   const setSize = useSetArticleElementSize()
+  const setPos = useSetArticleElementPositsion()
   const $article = useArticleElement()
   useIsomorphicLayoutEffect(() => {
     if (!$article) return
-    const { height, width } = $article.getBoundingClientRect()
+    const { height, width, x, y } = $article.getBoundingClientRect()
     setSize({ h: height, w: width })
+    setPos({ x, y })
 
     const observer = new ResizeObserver((entries) => {
       const entry = entries[0]
-      const { height, width } = entry.contentRect
+      const { height, width, x, y } = entry.contentRect
       setSize({ h: height, w: width })
+      setPos({ x, y })
     })
     observer.observe($article)
     return () => {
@@ -107,4 +120,5 @@ export {
   useArticleElement,
   useIsEOArticleElement,
   useArticleElementSize,
+  useArticleElementPositsion,
 }