Add read-only view (/s/note) (#563)

* Update Link classes to allow tooltips/titles

* Added read-only-view, Move note title extraction into separate file

(cherry picked from commit be23083ca3966f26b1b841d5cf4f21e299c8a55a)
(cherry picked from commit cbc595d3fc336b0a649c396dfae30fa08082384c)

* Optimized look of document-infobar

(cherry picked from commit 0176668b156da3fd7c534161a839ca0e3495119c)

# Conflicts:
#	src/components/editor/document-bar/document-info/document-info-time-line.tsx

* Show help-button only in Editor-variant of AppBar

(cherry picked from commit 3c26e1619c774fe162cb3d8fae9e79ced92c9c3e)

* Update CHANGELOG

(cherry picked from commit d0d29e7d408515cc8f86df45d13fff60d741873e)

* Move motd-banner to top of page

(cherry picked from commit 43a9a274bf5da3fdf640ec905ab38153c81b014b)

* Refactor isInline to size property

(cherry picked from commit cb4ee74b7c97ec9711946f28924e9c890b752ea3)

# Conflicts:
#	src/components/editor/document-bar/document-info/document-info-time-line.tsx

* Add size attribute to user-avatar

(cherry picked from commit 9629b58911b9d4f3aed81ef8c271fbc8e5a15aa4)

* Add mode-enum to app-bar

(cherry picked from commit 08f95be58974468c1e2897b475e5e3235b79c230)

* Split DocumentRenderPane into scrollable- and non-scrollable variant

(cherry picked from commit 44dd27edfd967745c548f7ae1fd2047e812cdc22)

* Removed unnecessary className

CHANGELOG.md

@@ -32,9 +32,9 @@
 - Highlighted code blocks can now use line wrapping and line numbers at once
 - Images, videos, and other non-text content is now wider in View Mode
 - Notes may now be deleted directly from the history page
-- HedgeDoc instances can now be branded either with a '@ <custom string>' or '@ <custom logo>' after the HedgeDoc logo and text
+- HedgeDoc instances can be branded either with a '@ \<custom string\>' or '@ \<custom logo\>' after the HedgeDoc logo and text
 - Images will be loaded via proxy if an image proxy is configured in the backend
-- Asciinema videos may now be embedded by pasting the URL of one video into a single line
+- Asciinema videos may be embedded by pasting the URL of one video into a single line
 - The toolbar includes an emoji and fork-awesome icon picker.
 - Collapsable blocks can be added via a toolbar button or via autocompletion of "<details"
 - Added shortcodes for [fork-awesome icons](https://forkaweso.me/Fork-Awesome/icons/) (e.g. `:fa-picture-o:`)
@@ -54,10 +54,11 @@
 - The gist and pdf embeddings now use a one-click aproach similar to vimeo and youtube
 - Use [Twemoji](https://twemoji.twitter.com/) as icon font
 - The `[name=...]`, `[time=...]` and `[color=...]` tags may now be used anywhere in the document and not just inside of blockquotes and lists.
-- The <i class="fa fa-picture-o"/> (add image) and <i class="fa fa-link"/> (add link) toolbar buttons, put selected links directly in the `()` instead of the `[]` part of the generated markdown
+- The <i class="fa fa-picture-o"/> (add image) and <i class="fa fa-link"/> (add link) toolbar buttons put selected links directly in the `()` instead of the `[]` part of the generated markdown.
 - The help dialog has multiple tabs, and is a bit more organized.
 - Use KaTeX instead of MathJax. ([Why?](https://community.codimd.org/t/frequently-asked-questions/190))
-- The access tokens for the CLI and 3rd-party-clients can be managed in the user profile.
+- The dark-mode is also applied to the read-only-view and can be toggled from there.
+- Access tokens for the CLI and 3rd-party-clients can be managed in the user profile.
 
 ---
 

public/api/v2/notes/banner

@@ -2,12 +2,11 @@
     "id": "ABC123",
     "alias": "banner",
     "lastChange": {
-        "userId": "snskxnksnxksnxksnx",
-        "username": "testy",
-        "timestamp": 123456789
+        "userId": "test",
+        "timestamp": 1600033920
     },
     "viewcount": 0,
-    "createtime": "2020-05-22T20:46:08.962Z",
+    "createtime": 1600033920,
     "content": "This is the test banner text",
     "authorship": [],
     "preVersionTwoNote": true

public/api/v2/notes/old

@@ -2,12 +2,11 @@
     "id": "ABC123",
     "alias": "old",
     "lastChange": {
-        "userId": "snskxnksnxksnxksnx",
-        "username": "testy",
-        "timestamp": 123456789
+        "userId": "test",
+        "timestamp": 1600033920
     },
     "viewcount": 0,
-    "createtime": "2020-05-22T20:46:08.962Z",
+    "createtime": 1600033920,
     "content": "test123",
     "authorship": [],
     "preVersionTwoNote": false

public/locales/en.json

@@ -393,6 +393,18 @@
             "clickToLoad": "Click to load"
         }
     },
+    "views": {
+        "presentation": {},
+        "readOnly": {
+            "viewCount": "views",
+            "editNote": "Edit this note",
+            "loading": "Loading note contents ...",
+            "error": {
+                "title": "Error while loading note",
+                "description": "Probably the requested note does not exist or was deleted."
+            }
+        }
+    },
     "common": {
         "import": "Import",
         "export": "Export",

src/api/notes/index.ts

@@ -2,7 +2,6 @@ import { defaultFetchConfig, expectResponseCode, getApiUrl } from '../utils'
 
 interface LastChange {
   userId: string
-  username: string
   timestamp: number
 }
 
@@ -11,14 +10,16 @@ export interface Note {
   alias: string
   lastChange: LastChange
   viewcount: number
-  createtime: string
+  createtime: number
   content: string
   authorship: number[]
   preVersionTwoNote: boolean
 }
 
 export const getNote = async (noteId: string): Promise<Note> => {
-  const response = await fetch(getApiUrl() + `/notes/${noteId}`)
+  const response = await fetch(getApiUrl() + `/notes/${noteId}`, {
+    ...defaultFetchConfig
+  })
   expectResponseCode(response)
   return await response.json() as Promise<Note>
 }

src/components/common/document-title/note-title-extractor.ts

@@ -0,0 +1,11 @@
+import { YAMLMetaData } from '../../editor/yaml-metadata/yaml-metadata'
+
+export const extractNoteTitle = (defaultTitle: string, noteMetadata?: YAMLMetaData, firstHeading?: string): string => {
+  if (noteMetadata?.title && noteMetadata?.title !== '') {
+    return noteMetadata.title
+  } else if (noteMetadata?.opengraph && noteMetadata?.opengraph.get('title') && noteMetadata?.opengraph.get('title') !== '') {
+    return (noteMetadata?.opengraph.get('title') ?? defaultTitle)
+  } else {
+    return (firstHeading ?? defaultTitle).trim()
+  }
+}

src/components/common/links/external-link.tsx

@@ -4,13 +4,14 @@ import { IconName } from '../fork-awesome/types'
 import { ShowIf } from '../show-if/show-if'
 import { LinkWithTextProps } from './types'
 
-export const ExternalLink: React.FC<LinkWithTextProps> = ({ href, text, icon, id, className = 'text-light' }) => {
+export const ExternalLink: React.FC<LinkWithTextProps> = ({ href, text, icon, id, className = 'text-light', title }) => {
   return (
     <a href={href}
       target="_blank"
       rel="noopener noreferrer"
       id={id}
       className={className}
+      title={title}
       dir='auto'
     >
       <ShowIf condition={!!icon}>

src/components/common/links/internal-link.tsx

@@ -5,11 +5,12 @@ import { IconName } from '../fork-awesome/types'
 import { ShowIf } from '../show-if/show-if'
 import { LinkWithTextProps } from './types'
 
-export const InternalLink: React.FC<LinkWithTextProps> = ({ href, text, icon, id, className = 'text-light' }) => {
+export const InternalLink: React.FC<LinkWithTextProps> = ({ href, text, icon, id, className = 'text-light', title }) => {
   return (
     <Link to={href}
       className={className}
       id={id}
+      title={title}
     >
       <ShowIf condition={!!icon}>
         <ForkAwesomeIcon icon={icon as IconName} fixedWidth={true}/>&nbsp;

src/components/common/links/types.d.ts

@@ -6,6 +6,7 @@ interface GeneralLinkProp {
   icon?: IconName
   id?: string
   className?: string
+  title?: string
 }
 
 export interface LinkWithTextProps extends GeneralLinkProp {

src/components/common/user-avatar/user-avatar.scss

@@ -1,8 +1,15 @@
 .user-avatar {
   width: 20px;
   height: 20px;
-}
 
-.user-name {
-  font-size: 1rem;
+  &.lg {
+    width: 30px;
+    height: 30px;
+  }
+
+  &.sm {
+    width: 16px;
+    height: 16px;
+  }
+
 }

src/components/common/user-avatar/user-avatar.tsx

@@ -4,25 +4,26 @@ import { ShowIf } from '../show-if/show-if'
 import './user-avatar.scss'
 
 export interface UserAvatarProps {
-    name: string;
-    photo: string;
-    additionalClasses?: string;
-    showName?: boolean
+  size?: 'sm' | 'lg'
+  name: string;
+  photo: string;
+  additionalClasses?: string;
+  showName?: boolean
 }
 
-const UserAvatar: React.FC<UserAvatarProps> = ({ name, photo, additionalClasses = '', showName = true }) => {
+const UserAvatar: React.FC<UserAvatarProps> = ({ name, photo, size, additionalClasses = '', showName = true }) => {
   const { t } = useTranslation()
 
   return (
     <span className={'d-inline-flex align-items-center ' + additionalClasses}>
       <img
         src={photo}
-        className="user-avatar rounded"
+        className={`user-avatar rounded mr-1 ${size ?? ''}`}
         alt={t('common.avatarOf', { name })}
         title={name}
       />
       <ShowIf condition={showName}>
-        <span className="mx-1 user-name">{name}</span>
+        <span className="mx-1">{name}</span>
       </ShowIf>
     </span>
   )

src/components/editor/app-bar/app-bar.tsx

@@ -16,7 +16,16 @@ import { HelpButton } from './help-button/help-button'
 import { NavbarBranding } from './navbar-branding'
 import { SyncScrollButtons } from './sync-scroll-buttons/sync-scroll-buttons'
 
-export const AppBar: React.FC = () => {
+export enum AppBarMode {
+  BASIC,
+  EDITOR
+}
+
+export interface AppBarProps {
+  mode: AppBarMode
+}
+
+export const AppBar: React.FC<AppBarProps> = ({ mode }) => {
   const { t } = useTranslation()
   const { id } = useParams<EditorPathParams>()
   const userExists = useSelector((state: ApplicationState) => !!state.user)
@@ -25,15 +34,19 @@ export const AppBar: React.FC = () => {
     <Navbar bg={'light'}>
       <Nav className="mr-auto d-flex align-items-center">
         <NavbarBranding/>
-        <EditorViewMode/>
-        <SyncScrollButtons/>
+        <ShowIf condition={mode === AppBarMode.EDITOR}>
+          <EditorViewMode/>
+          <SyncScrollButtons/>
+        </ShowIf>
         <DarkModeButton/>
         <Link to={`/p/${id}`} target='_blank'>
           <Button title={t('editor.documentBar.slideMode')} className="ml-2 text-secondary" size="sm" variant="outline-light">
             <ForkAwesomeIcon icon="television"/>
           </Button>
         </Link>
-        <HelpButton/>
+        <ShowIf condition={mode === AppBarMode.EDITOR}>
+          <HelpButton/>
+        </ShowIf>
       </Nav>
       <Nav className="d-flex align-items-center text-secondary">
         <Button className="mx-2" size="sm" variant="primary">

src/components/editor/document-bar/document-info/document-info-button.tsx

@@ -24,6 +24,7 @@ export const DocumentInfoButton: React.FC = () => {
           <ListGroup>
             <ListGroup.Item>
               <DocumentInfoTimeLine
+                size={'2x'}
                 mode={DocumentInfoLineWithTimeMode.CREATED}
                 time={DateTime.local().minus({ days: 11 })}
                 userName={'Tilman'}
@@ -31,20 +32,21 @@ export const DocumentInfoButton: React.FC = () => {
             </ListGroup.Item>
             <ListGroup.Item>
               <DocumentInfoTimeLine
+                size={'2x'}
                 mode={DocumentInfoLineWithTimeMode.EDITED}
                 time={DateTime.local().minus({ minutes: 3 })}
                 userName={'Philip'}
                 profileImageSrc={'/avatar.png'}/>
             </ListGroup.Item>
             <ListGroup.Item>
-              <DocumentInfoLine icon={'users'}>
+              <DocumentInfoLine icon={'users'} size={'2x'}>
                 <Trans i18nKey='editor.modal.documentInfo.usersContributed'>
                   <UnitalicBoldText text={'42'}/>
                 </Trans>
               </DocumentInfoLine>
             </ListGroup.Item>
             <ListGroup.Item>
-              <DocumentInfoLine icon={'history'}>
+              <DocumentInfoLine icon={'history'} size={'2x'}>
                 <Trans i18nKey='editor.modal.documentInfo.revisions'>
                   <UnitalicBoldText text={'192'}/>
                 </Trans>

src/components/editor/document-bar/document-info/document-info-line.tsx

@@ -4,12 +4,13 @@ import { IconName } from '../../../common/fork-awesome/types'
 
 export interface DocumentInfoLineProps {
   icon: IconName
+  size?: '2x' | '3x' | '4x' | '5x' | undefined
 }
 
-export const DocumentInfoLine: React.FC<DocumentInfoLineProps> = ({ icon, children }) => {
+export const DocumentInfoLine: React.FC<DocumentInfoLineProps> = ({ icon, size, children }) => {
   return (
     <span className={'d-flex align-items-center'}>
-      <ForkAwesomeIcon icon={icon} size={'2x'} fixedWidth={true} className={'mx-2'}/>
+      <ForkAwesomeIcon icon={icon} size={size} fixedWidth={true} className={'mx-2'}/>
       <i className={'d-flex align-items-center'}>
         {children}
       </i>

src/components/editor/document-bar/document-info/document-info-time-line.scss

@@ -1,4 +0,0 @@
-.document-info-avatar img {
-  height: 30px;
-  width: 30px;
-}

src/components/editor/document-bar/document-info/document-info-time-line.tsx

@@ -3,11 +3,11 @@ import React from 'react'
 import { Trans, useTranslation } from 'react-i18next'
 import { IconName } from '../../../common/fork-awesome/types'
 import { DocumentInfoLine } from './document-info-line'
-import './document-info-time-line.scss'
 import { TimeFromNow } from './time-from-now'
 import { UserAvatar } from '../../../common/user-avatar/user-avatar'
 
 export interface DocumentInfoLineWithTimeProps {
+  size?: '2x' | '3x' | '4x' | '5x' | undefined
   time: DateTime,
   mode: DocumentInfoLineWithTimeMode
   userName: string
@@ -19,16 +19,16 @@ export enum DocumentInfoLineWithTimeMode {
   EDITED
 }
 
-export const DocumentInfoTimeLine: React.FC<DocumentInfoLineWithTimeProps> = ({ time, mode, userName, profileImageSrc }) => {
+export const DocumentInfoTimeLine: React.FC<DocumentInfoLineWithTimeProps> = ({ time, mode, userName, profileImageSrc, size }) => {
   useTranslation()
 
   const i18nKey = mode === DocumentInfoLineWithTimeMode.CREATED ? 'editor.modal.documentInfo.created' : 'editor.modal.documentInfo.edited'
   const icon: IconName = mode === DocumentInfoLineWithTimeMode.CREATED ? 'plus' : 'pencil'
 
   return (
-    <DocumentInfoLine icon={icon}>
+    <DocumentInfoLine icon={icon} size={size}>
       <Trans i18nKey={i18nKey} >
-        <UserAvatar photo={profileImageSrc} additionalClasses={'document-info-avatar font-style-normal bold font-weight-bold'} name={userName}/>
+        <UserAvatar photo={profileImageSrc} additionalClasses={'font-style-normal bold font-weight-bold'} name={userName} size={size ? 'lg' : undefined}/>
         <TimeFromNow time={time}/>
       </Trans>
     </DocumentInfoLine>

src/components/editor/document-renderer-pane/document-render-pane.tsx

@@ -1,4 +1,4 @@
-import React, { useCallback, useEffect, useRef, useState } from 'react'
+import React, { RefObject, useState } from 'react'
 import { Dropdown } from 'react-bootstrap'
 import useResizeObserver from 'use-resize-observer'
 import { TocAst } from '../../../external-types/markdown-it-toc-done-right/interface'
@@ -6,119 +6,48 @@ import { ForkAwesomeIcon } from '../../common/fork-awesome/fork-awesome-icon'
 import { ShowIf } from '../../common/show-if/show-if'
 import { LineMarkerPosition } from '../../markdown-renderer/types'
 import { FullMarkdownRenderer } from '../../markdown-renderer/full-markdown-renderer'
-import { ScrollProps, ScrollState } from '../scroll/scroll-props'
-import { findLineMarks } from '../scroll/utils'
 import { TableOfContents } from '../table-of-contents/table-of-contents'
 import { YAMLMetaData } from '../yaml-metadata/yaml-metadata'
 
-interface DocumentRenderPaneProps {
+export interface DocumentRenderPaneProps {
   content: string
+  extraClasses?: string
   onFirstHeadingChange: (firstHeading: string | undefined) => void
+  onLineMarkerPositionChanged?: (lineMarkerPosition: LineMarkerPosition[]) => void
   onMetadataChange: (metaData: YAMLMetaData | undefined) => void
+  onMouseEnterRenderer?: () => void
+  onScrollRenderer?: () => void
   onTaskCheckedChange: (lineInMarkdown: number, checked: boolean) => void
+  rendererReference?: RefObject<HTMLDivElement>
   wide?: boolean
 }
 
-export const DocumentRenderPane: React.FC<DocumentRenderPaneProps & ScrollProps> = ({
+export const DocumentRenderPane: React.FC<DocumentRenderPaneProps> = ({
   content,
+  extraClasses,
   onFirstHeadingChange,
-  onMakeScrollSource,
+  onLineMarkerPositionChanged,
   onMetadataChange,
-  onScroll,
+  onMouseEnterRenderer,
+  onScrollRenderer,
   onTaskCheckedChange,
-  scrollState,
+  rendererReference,
   wide
 }) => {
   const [tocAst, setTocAst] = useState<TocAst>()
-  const renderer = useRef<HTMLDivElement>(null)
-  const { width } = useResizeObserver({ ref: renderer })
-  const lastScrollPosition = useRef<number>()
-  const [lineMarks, setLineMarks] = useState<LineMarkerPosition[]>()
-
+  const { width } = useResizeObserver(rendererReference ? { ref: rendererReference } : undefined)
   const realWidth = width || 0
 
-  const scrollTo = useCallback((targetPosition:number):void => {
-    if (!renderer.current || targetPosition === lastScrollPosition.current) {
-      return
-    }
-    lastScrollPosition.current = targetPosition
-    renderer.current.scrollTo({
-      top: targetPosition
-    })
-  }, [])
-
-  useEffect(() => {
-    if (!renderer.current || !lineMarks || lineMarks.length === 0 || !scrollState) {
-      return
-    }
-    if (scrollState.firstLineInView < lineMarks[0].line) {
-      scrollTo(0)
-      return
-    }
-    if (scrollState.firstLineInView > lineMarks[lineMarks.length - 1].line) {
-      scrollTo(renderer.current.offsetHeight)
-      return
-    }
-    const { lastMarkBefore, firstMarkAfter } = findLineMarks(lineMarks, scrollState.firstLineInView)
-    const positionBefore = lastMarkBefore ? lastMarkBefore.position : lineMarks[0].position
-    const positionAfter = firstMarkAfter ? firstMarkAfter.position : renderer.current.offsetHeight
-    const lastMarkBeforeLine = lastMarkBefore ? lastMarkBefore.line : 1
-    const firstMarkAfterLine = firstMarkAfter ? firstMarkAfter.line : content.split('\n').length
-    const lineCount = firstMarkAfterLine - lastMarkBeforeLine
-    const blockHeight = positionAfter - positionBefore
-    const lineHeight = blockHeight / lineCount
-    const position = positionBefore + (scrollState.firstLineInView - lastMarkBeforeLine) * lineHeight + scrollState.scrolledPercentage / 100 * lineHeight
-    const correctedPosition = Math.floor(position)
-    scrollTo(correctedPosition)
-  }, [content, lineMarks, scrollState, scrollTo])
-
-  const userScroll = useCallback(() => {
-    if (!renderer.current || !lineMarks || lineMarks.length === 0 || !onScroll) {
-      return
-    }
-
-    const scrollTop = renderer.current.scrollTop
-
-    const lineMarksBeforeScrollTop = lineMarks.filter(lineMark => lineMark.position <= scrollTop)
-    if (lineMarksBeforeScrollTop.length === 0) {
-      return
-    }
-
-    const lineMarksAfterScrollTop = lineMarks.filter(lineMark => lineMark.position > scrollTop)
-    if (lineMarksAfterScrollTop.length === 0) {
-      return
-    }
-
-    const beforeLineMark = lineMarksBeforeScrollTop
-      .reduce((prevLineMark, currentLineMark) =>
-        prevLineMark.line >= currentLineMark.line ? prevLineMark : currentLineMark)
-
-    const afterLineMark = lineMarksAfterScrollTop
-      .reduce((prevLineMark, currentLineMark) =>
-        prevLineMark.line < currentLineMark.line ? prevLineMark : currentLineMark)
-
-    const componentHeight = afterLineMark.position - beforeLineMark.position
-    const distanceToBefore = scrollTop - beforeLineMark.position
-    const percentageRaw = (distanceToBefore / componentHeight)
-    const lineCount = afterLineMark.line - beforeLineMark.line
-    const line = Math.floor(lineCount * percentageRaw + beforeLineMark.line)
-    const lineHeight = componentHeight / lineCount
-    const innerScrolling = Math.floor((distanceToBefore % lineHeight) / lineHeight * 100)
-
-    const newScrollState: ScrollState = { firstLineInView: line, scrolledPercentage: innerScrolling }
-    onScroll(newScrollState)
-  }, [lineMarks, onScroll])
-
   return (
-    <div className={'bg-light flex-fill pb-5 flex-row d-flex w-100 h-100 overflow-y-scroll'}
-      ref={renderer} onScroll={userScroll} onMouseEnter={onMakeScrollSource}>
+    <div className={`bg-light flex-fill pb-5 flex-row d-flex w-100 h-100 ${extraClasses ?? ''}`}
+      ref={rendererReference} onScroll={onScrollRenderer} onMouseEnter={onMouseEnterRenderer}>
       <div className={'col-md'}/>
       <div className={'bg-light flex-fill'}>
         <FullMarkdownRenderer
           className={'flex-fill mb-3'}
           content={content}
           onFirstHeadingChange={onFirstHeadingChange}
-          onLineMarkerPositionChanged={setLineMarks}
+          onLineMarkerPositionChanged={onLineMarkerPositionChanged}
           onMetaDataChange={onMetadataChange}
           onTaskCheckedChange={onTaskCheckedChange}
           onTocChange={(tocAst) => setTocAst(tocAst)}

src/components/editor/document-renderer-pane/scrolling-document-render-pane.tsx

@@ -0,0 +1,107 @@
+import React, { useCallback, useEffect, useRef, useState } from 'react'
+import { LineMarkerPosition } from '../../markdown-renderer/types'
+import { ScrollProps, ScrollState } from '../scroll/scroll-props'
+import { findLineMarks } from '../scroll/utils'
+import { DocumentRenderPane, DocumentRenderPaneProps } from './document-render-pane'
+
+export const ScrollingDocumentRenderPane: React.FC<DocumentRenderPaneProps & ScrollProps> = ({
+  content,
+  scrollState,
+  wide,
+  onFirstHeadingChange,
+  onMakeScrollSource,
+  onMetadataChange,
+  onScroll,
+  onTaskCheckedChange
+}) => {
+  const lastScrollPosition = useRef<number>()
+  const renderer = useRef<HTMLDivElement>(null)
+  const [lineMarks, setLineMarks] = useState<LineMarkerPosition[]>()
+
+  const scrollTo = useCallback((targetPosition: number): void => {
+    if (!renderer.current || targetPosition === lastScrollPosition.current) {
+      return
+    }
+    lastScrollPosition.current = targetPosition
+    renderer.current.scrollTo({
+      top: targetPosition
+    })
+  }, [renderer])
+
+  useEffect(() => {
+    if (!renderer.current || !lineMarks || lineMarks.length === 0 || !scrollState) {
+      return
+    }
+    if (scrollState.firstLineInView < lineMarks[0].line) {
+      scrollTo(0)
+      return
+    }
+    if (scrollState.firstLineInView > lineMarks[lineMarks.length - 1].line) {
+      scrollTo(renderer.current.offsetHeight)
+      return
+    }
+    const { lastMarkBefore, firstMarkAfter } = findLineMarks(lineMarks, scrollState.firstLineInView)
+    const positionBefore = lastMarkBefore ? lastMarkBefore.position : lineMarks[0].position
+    const positionAfter = firstMarkAfter ? firstMarkAfter.position : renderer.current.offsetHeight
+    const lastMarkBeforeLine = lastMarkBefore ? lastMarkBefore.line : 1
+    const firstMarkAfterLine = firstMarkAfter ? firstMarkAfter.line : content.split('\n').length
+    const lineCount = firstMarkAfterLine - lastMarkBeforeLine
+    const blockHeight = positionAfter - positionBefore
+    const lineHeight = blockHeight / lineCount
+    const position = positionBefore + (scrollState.firstLineInView - lastMarkBeforeLine) * lineHeight + scrollState.scrolledPercentage / 100 * lineHeight
+    const correctedPosition = Math.floor(position)
+    scrollTo(correctedPosition)
+  }, [content, lineMarks, scrollState, scrollTo])
+
+  const userScroll = useCallback(() => {
+    if (!renderer.current || !lineMarks || lineMarks.length === 0 || !onScroll) {
+      return
+    }
+
+    const scrollTop = renderer.current.scrollTop
+
+    const lineMarksBeforeScrollTop = lineMarks.filter(lineMark => lineMark.position <= scrollTop)
+    if (lineMarksBeforeScrollTop.length === 0) {
+      return
+    }
+
+    const lineMarksAfterScrollTop = lineMarks.filter(lineMark => lineMark.position > scrollTop)
+    if (lineMarksAfterScrollTop.length === 0) {
+      return
+    }
+
+    const beforeLineMark = lineMarksBeforeScrollTop
+      .reduce((prevLineMark, currentLineMark) =>
+        prevLineMark.line >= currentLineMark.line ? prevLineMark : currentLineMark)
+
+    const afterLineMark = lineMarksAfterScrollTop
+      .reduce((prevLineMark, currentLineMark) =>
+        prevLineMark.line < currentLineMark.line ? prevLineMark : currentLineMark)
+
+    const componentHeight = afterLineMark.position - beforeLineMark.position
+    const distanceToBefore = scrollTop - beforeLineMark.position
+    const percentageRaw = (distanceToBefore / componentHeight)
+    const lineCount = afterLineMark.line - beforeLineMark.line
+    const line = Math.floor(lineCount * percentageRaw + beforeLineMark.line)
+    const lineHeight = componentHeight / lineCount
+    const innerScrolling = Math.floor((distanceToBefore % lineHeight) / lineHeight * 100)
+
+    const newScrollState: ScrollState = { firstLineInView: line, scrolledPercentage: innerScrolling }
+    onScroll(newScrollState)
+  }, [lineMarks, onScroll])
+
+  return (
+    <DocumentRenderPane
+      content={content}
+      extraClasses={'overflow-y-scroll'}
+      rendererReference={renderer}
+      wide={wide}
+      onFirstHeadingChange={onFirstHeadingChange}
+      onLineMarkerPositionChanged={setLineMarks}
+      onMetadataChange={onMetadataChange}
+      onMouseEnterRenderer={onMakeScrollSource}
+      onScrollRenderer={userScroll}
+      onTaskCheckedChange={onTaskCheckedChange}
+    />
+  )
+}

src/components/editor/editor.tsx

@@ -6,11 +6,12 @@ import { ApplicationState } from '../../redux'
 import { setEditorMode } from '../../redux/editor/methods'
 import { ApplyDarkMode } from '../common/apply-dark-mode/apply-dark-mode'
 import { DocumentTitle } from '../common/document-title/document-title'
+import { extractNoteTitle } from '../common/document-title/note-title-extractor'
 import { MotdBanner } from '../common/motd-banner/motd-banner'
-import { AppBar } from './app-bar/app-bar'
+import { AppBar, AppBarMode } from './app-bar/app-bar'
 import { EditorMode } from './app-bar/editor-view-mode'
 import { DocumentBar } from './document-bar/document-bar'
-import { DocumentRenderPane } from './document-renderer-pane/document-render-pane'
+import { ScrollingDocumentRenderPane } from './document-renderer-pane/scrolling-document-render-pane'
 import { EditorPane } from './editor-pane/editor-pane'
 import { editorTestContent } from './editorTestContent'
 import { DualScrollState, ScrollState } from './scroll/scroll-props'
@@ -49,14 +50,9 @@ export const Editor: React.FC = () => {
   }))
 
   const updateDocumentTitle = useCallback(() => {
-    if (noteMetadata.current?.title && noteMetadata.current?.title !== '') {
-      setDocumentTitle(noteMetadata.current.title)
-    } else if (noteMetadata.current?.opengraph && noteMetadata.current?.opengraph.get('title') && noteMetadata.current?.opengraph.get('title') !== '') {
-      setDocumentTitle(noteMetadata.current.opengraph.get('title') ?? untitledNote)
-    } else {
-      setDocumentTitle((firstHeading.current ?? untitledNote).trim())
-    }
-  }, [untitledNote])
+    const noteTitle = extractNoteTitle(untitledNote, noteMetadata.current, firstHeading.current)
+    setDocumentTitle(noteTitle)
+  }, [noteMetadata, firstHeading, untitledNote])
 
   const onFirstHeadingChange = useCallback((newFirstHeading: string | undefined) => {
     firstHeading.current = newFirstHeading
@@ -114,7 +110,7 @@ export const Editor: React.FC = () => {
       <MotdBanner/>
       <DocumentTitle title={documentTitle}/>
       <div className={'d-flex flex-column vh-100'}>
-        <AppBar/>
+        <AppBar mode={AppBarMode.EDITOR}/>
         <DocumentBar title={documentTitle} noteContent={markdownContent} updateNoteContent={(newContent) => setMarkdownContent(newContent)}/>
         <Splitter
           showLeft={editorMode === EditorMode.EDITOR || editorMode === EditorMode.BOTH}
@@ -129,7 +125,7 @@ export const Editor: React.FC = () => {
           }
           showRight={editorMode === EditorMode.PREVIEW || (editorMode === EditorMode.BOTH)}
           right={
-            <DocumentRenderPane
+            <ScrollingDocumentRenderPane
               content={markdownContent}
               onFirstHeadingChange={onFirstHeadingChange}
               onMakeScrollSource={() => { scrollSource.current = ScrollSource.RENDERER }}

src/components/pad-view-only/document-infobar.scss

@@ -0,0 +1,4 @@
+.document-infobar {
+  color: #777;
+  font-size: 0.85rem;
+}

src/components/pad-view-only/document-infobar.tsx

@@ -0,0 +1,60 @@
+import { DateTime } from 'luxon'
+import React from 'react'
+import { Trans, useTranslation } from 'react-i18next'
+import { InternalLink } from '../common/links/internal-link'
+import { ShowIf } from '../common/show-if/show-if'
+import './document-infobar.scss'
+import {
+  DocumentInfoLineWithTimeMode,
+  DocumentInfoTimeLine
+} from '../editor/document-bar/document-info/document-info-time-line'
+
+export interface DocumentInfobarProps {
+  changedAuthor: string
+  changedTime: number
+  createdAuthor: string
+  createdTime: number
+  editable: boolean
+  noteId: string
+  viewCount: number
+}
+
+export const DocumentInfobar: React.FC<DocumentInfobarProps> = ({
+  changedAuthor,
+  changedTime,
+  createdAuthor,
+  createdTime,
+  editable,
+  noteId,
+  viewCount
+}) => {
+  const { t } = useTranslation()
+
+  return (
+    <div className={'d-flex flex-row my-3 document-infobar'}>
+      <div className={'col-md'}>&nbsp;</div>
+      <div className={'d-flex flex-fill'}>
+        <div className={'d-flex flex-column'}>
+          <DocumentInfoTimeLine
+            mode={DocumentInfoLineWithTimeMode.CREATED}
+            time={ DateTime.fromSeconds(createdTime) }
+            userName={createdAuthor}
+            profileImageSrc={'/avatar.png'}/>
+          <DocumentInfoTimeLine
+            mode={DocumentInfoLineWithTimeMode.EDITED}
+            time={ DateTime.fromSeconds(changedTime) }
+            userName={changedAuthor}
+            profileImageSrc={'/avatar.png'}/>
+          <hr/>
+        </div>
+        <span className={'ml-auto'}>
+          { viewCount } <Trans i18nKey={'views.readOnly.viewCount'}/>
+          <ShowIf condition={editable}>
+            <InternalLink text={''} href={`/n/${noteId}`} icon={'pencil'} className={'text-primary text-decoration-none mx-1'} title={t('views.readOnly.editNote')}/>
+          </ShowIf>
+        </span>
+      </div>
+      <div className={'col-md'}>&nbsp;</div>
+    </div>
+  )
+}

src/components/pad-view-only/pad-view-only.tsx

@@ -0,0 +1,90 @@
+import React, { useCallback, useEffect, useRef, useState } from 'react'
+import { Alert } from 'react-bootstrap'
+import { Trans, useTranslation } from 'react-i18next'
+import { useParams } from 'react-router'
+import { getNote, Note } from '../../api/notes'
+import { ApplyDarkMode } from '../common/apply-dark-mode/apply-dark-mode'
+import { DocumentTitle } from '../common/document-title/document-title'
+import { extractNoteTitle } from '../common/document-title/note-title-extractor'
+import { MotdBanner } from '../common/motd-banner/motd-banner'
+import { ShowIf } from '../common/show-if/show-if'
+import { AppBar, AppBarMode } from '../editor/app-bar/app-bar'
+import { DocumentRenderPane } from '../editor/document-renderer-pane/document-render-pane'
+import { EditorPathParams } from '../editor/editor'
+import { YAMLMetaData } from '../editor/yaml-metadata/yaml-metadata'
+import { DocumentInfobar } from './document-infobar'
+
+export const PadViewOnly: React.FC = () => {
+  const { t } = useTranslation()
+  const { id } = useParams<EditorPathParams>()
+  const untitledNote = t('editor.untitledNote')
+  const [documentTitle, setDocumentTitle] = useState(untitledNote)
+  const [noteData, setNoteData] = useState<Note>()
+  const [error, setError] = useState(false)
+  const [loading, setLoading] = useState(true)
+  const noteMetadata = useRef<YAMLMetaData>()
+  const firstHeading = useRef<string>()
+
+  const updateDocumentTitle = useCallback(() => {
+    const noteTitle = extractNoteTitle(untitledNote, noteMetadata.current, firstHeading.current)
+    setDocumentTitle(noteTitle)
+  }, [untitledNote])
+
+  const onFirstHeadingChange = useCallback((newFirstHeading: string | undefined) => {
+    firstHeading.current = newFirstHeading
+    updateDocumentTitle()
+  }, [updateDocumentTitle])
+
+  const onMetadataChange = useCallback((metaData: YAMLMetaData | undefined) => {
+    noteMetadata.current = metaData
+    updateDocumentTitle()
+  }, [updateDocumentTitle])
+
+  useEffect(() => {
+    getNote(id)
+      .then(note => setNoteData(note))
+      .catch(() => setError(true))
+      .finally(() => setLoading(false))
+  }, [id])
+
+  return (
+    <div className={'d-flex flex-column mvh-100 bg-light'}>
+      <ApplyDarkMode/>
+      <DocumentTitle title={documentTitle}/>
+      <MotdBanner/>
+      <AppBar mode={AppBarMode.BASIC}/>
+      <div className={'container'}>
+        <ShowIf condition={error}>
+          <Alert variant={'danger'} className={'my-2'}>
+            <b><Trans i18nKey={'views.readOnly.error.title'}/></b>
+            <br/>
+            <Trans i18nKey={'views.readOnly.error.description'}/>
+          </Alert>
+        </ShowIf>
+        <ShowIf condition={loading}>
+          <Alert variant={'info'} className={'my-2'}>
+            <Trans i18nKey={'views.readOnly.loading'}/>
+          </Alert>
+        </ShowIf>
+      </div>
+      <ShowIf condition={!error && !loading}>
+        { /* TODO set editable and created author properly */ }
+        <DocumentInfobar
+          changedAuthor={noteData?.lastChange.userId ?? ''}
+          changedTime={noteData?.lastChange.timestamp ?? 0}
+          createdAuthor={'Test'}
+          createdTime={noteData?.createtime ?? 0}
+          editable={true}
+          noteId={id}
+          viewCount={noteData?.viewcount ?? 0}
+        />
+        <DocumentRenderPane
+          content={noteData?.content ?? ''}
+          onFirstHeadingChange={onFirstHeadingChange}
+          onMetadataChange={onMetadataChange}
+          onTaskCheckedChange={() => false}
+        />
+      </ShowIf>
+    </div>
+  )
+}

src/index.tsx

@@ -10,6 +10,7 @@ import { HistoryPage } from './components/history-page/history-page'
 import { IntroPage } from './components/intro-page/intro-page'
 import { LandingLayout } from './components/landing-layout/landing-layout'
 import { LoginPage } from './components/login-page/login-page'
+import { PadViewOnly } from './components/pad-view-only/pad-view-only'
 import { ProfilePage } from './components/profile-page/profile-page'
 import { RegisterPage } from './components/register-page/register-page'
 import { store } from './redux'
@@ -53,6 +54,9 @@ ReactDOM.render(
             <Route path="/n/:id">
               <Editor/>
             </Route>
+            <Route path="/s/:id">
+              <PadViewOnly/>
+            </Route>
             <Route path="/:id">
               <Redirector/>
             </Route>