perf: avoid uneccessary notes list item rerenders (#1904)

packages/web/src/javascripts/Components/Abstract/PureComponent.tsx

@@ -7,7 +7,7 @@ import { Component } from 'react'
 export type PureComponentState = Partial<Record<string, any>>
 export type PureComponentProps = Partial<Record<string, any>>
 
-export abstract class PureComponent<P = PureComponentProps, S = PureComponentState> extends Component<P, S> {
+export abstract class AbstractComponent<P = PureComponentProps, S = PureComponentState> extends Component<P, S> {
   private unsubApp!: () => void
   private reactionDisposers: IReactionDisposer[] = []
 

packages/web/src/javascripts/Components/ApplicationView/ApplicationView.tsx

@@ -4,7 +4,7 @@ import { ApplicationEvent, Challenge, removeFromArray, WebAppEvent } from '@stan
 import { PANEL_NAME_NOTES, PANEL_NAME_NAVIGATION } from '@/Constants/Constants'
 import { alertDialog, RouteType } from '@standardnotes/ui-services'
 import { WebApplication } from '@/Application/Application'
-import Navigation from '@/Components/Navigation/Navigation'
+import Navigation from '@/Components/Tags/Navigation'
 import NoteGroupView from '@/Components/NoteGroupView/NoteGroupView'
 import Footer from '@/Components/Footer/Footer'
 import SessionsModal from '@/Components/SessionsModal/SessionsModal'

packages/web/src/javascripts/Components/ContentListView/ContentList.tsx

@@ -40,6 +40,7 @@ const ContentList: FunctionComponent<Props> = ({
   const { selectPreviousItem, selectNextItem } = selectionController
   const { hideTags, hideDate, hideNotePreview, hideEditorIcon } = itemListController.webDisplayOptions
   const { sortBy } = itemListController.displayOptions
+  const selectedTag = navigationController.selected
 
   const onScroll: UIEventHandler = useCallback(
     (e) => {
@@ -72,25 +73,27 @@ const ContentList: FunctionComponent<Props> = ({
     [selectionController],
   )
 
-  const getTagsForItem = (item: ListableContentItem) => {
+  const getTagsForItem = useCallback(
-    if (hideTags) {
+    (item: ListableContentItem) => {
-      return []
+      if (hideTags) {
-    }
+        return []
+      }
 
-    const selectedTag = navigationController.selected
+      if (!selectedTag) {
-    if (!selectedTag) {
+        return []
-      return []
+      }
-    }
 
-    const tags = application.getItemTags(item)
+      const tags = application.getItemTags(item)
 
-    const isNavigatingOnlyTag = selectedTag instanceof SNTag && tags.length === 1
+      const isNavigatingOnlyTag = selectedTag instanceof SNTag && tags.length === 1
-    if (isNavigatingOnlyTag) {
+      if (isNavigatingOnlyTag) {
-      return []
+        return []
-    }
+      }
 
-    return tags
+      return tags
-  }
+    },
+    [hideTags, selectedTag, application],
+  )
 
   return (
     <div

packages/web/src/javascripts/Components/ContentListView/ContentListItem.tsx

@@ -1,8 +1,8 @@
 import { ContentType } from '@standardnotes/snjs'
-import { FunctionComponent } from 'react'
+import React, { FunctionComponent } from 'react'
 import FileListItem from './FileListItem'
 import NoteListItem from './NoteListItem'
-import { AbstractListItemProps } from './Types/AbstractListItemProps'
+import { AbstractListItemProps, doListItemPropsMeritRerender } from './Types/AbstractListItemProps'
 
 const ContentListItem: FunctionComponent<AbstractListItemProps> = (props) => {
   switch (props.item.content_type) {
@@ -15,4 +15,4 @@ const ContentListItem: FunctionComponent<AbstractListItemProps> = (props) => {
   }
 }
 
-export default ContentListItem
+export default React.memo(ContentListItem, (a, b) => !doListItemPropsMeritRerender(a, b))

packages/web/src/javascripts/Components/ContentListView/NoteListItem.tsx

@@ -13,6 +13,7 @@ import { AppPaneId } from '../ResponsivePane/AppPaneMetadata'
 import { useContextMenuEvent } from '@/Hooks/useContextMenuEvent'
 import ListItemNotePreviewText from './ListItemNotePreviewText'
 import { ListItemTitle } from './ListItemTitle'
+import { log, LoggingDomain } from '@/Logging'
 
 const NoteListItem: FunctionComponent<DisplayableListItemProps> = ({
   application,
@@ -70,6 +71,8 @@ const NoteListItem: FunctionComponent<DisplayableListItemProps> = ({
 
   useContextMenuEvent(listItemRef, openContextMenu)
 
+  log(LoggingDomain.ItemsList, 'Rendering note list item', item.title)
+
   return (
     <div
       ref={listItemRef}

packages/web/src/javascripts/Components/ContentListView/Types/AbstractListItemProps.ts

@@ -1,7 +1,7 @@
 import { WebApplication } from '@/Application/Application'
 import { FilesController } from '@/Controllers/FilesController'
 import { NotesController } from '@/Controllers/NotesController'
-import { SortableItem, SNTag } from '@standardnotes/snjs'
+import { SortableItem, SNTag, Uuids } from '@standardnotes/snjs'
 import { ListableContentItem } from './ListableContentItem'
 
 export type AbstractListItemProps = {
@@ -18,3 +18,89 @@ export type AbstractListItemProps = {
   sortBy: keyof SortableItem | undefined
   tags: SNTag[]
 }
+
+export function doListItemPropsMeritRerender(previous: AbstractListItemProps, next: AbstractListItemProps): boolean {
+  const simpleComparison: (keyof AbstractListItemProps)[] = [
+    'onSelect',
+    'hideDate',
+    'hideIcon',
+    'hideTags',
+    'hidePreview',
+    'selected',
+    'sortBy',
+  ]
+
+  for (const key of simpleComparison) {
+    if (previous[key] !== next[key]) {
+      return true
+    }
+  }
+
+  if (previous['item'] !== next['item']) {
+    if (doesItemChangeMeritRerender(previous['item'], next['item'])) {
+      return true
+    }
+  }
+
+  return doesTagsChangeMeritRerender(previous['tags'], next['tags'])
+}
+
+function doesTagsChangeMeritRerender(previous: SNTag[], next: SNTag[]): boolean {
+  if (previous === next) {
+    return false
+  }
+
+  if (previous.length !== next.length) {
+    return true
+  }
+
+  if (previous.length === 0 && next.length === 0) {
+    return false
+  }
+
+  if (Uuids(previous).sort().join() !== Uuids(next).sort().join()) {
+    return true
+  }
+
+  if (
+    previous
+      .map((t) => t.title)
+      .sort()
+      .join() !==
+    next
+      .map((t) => t.title)
+      .sort()
+      .join()
+  ) {
+    return true
+  }
+
+  return false
+}
+
+function doesItemChangeMeritRerender(previous: ListableContentItem, next: ListableContentItem): boolean {
+  if (previous.uuid !== next.uuid) {
+    return true
+  }
+
+  const propertiesMeritingRerender: (keyof ListableContentItem)[] = [
+    'title',
+    'protected',
+    'updatedAtString',
+    'createdAtString',
+    'hidePreview',
+    'preview_html',
+    'preview_plain',
+    'archived',
+    'starred',
+    'pinned',
+  ]
+
+  for (const key of propertiesMeritingRerender) {
+    if (previous[key] !== next[key]) {
+      return true
+    }
+  }
+
+  return false
+}

packages/web/src/javascripts/Components/Footer/Footer.tsx

@@ -1,6 +1,6 @@
 import { WebApplication } from '@/Application/Application'
 import { ApplicationGroup } from '@/Application/ApplicationGroup'
-import { PureComponent } from '@/Components/Abstract/PureComponent'
+import { AbstractComponent } from '@/Components/Abstract/PureComponent'
 import { destroyAllObjectProperties, preventRefreshing } from '@/Utils'
 import { ApplicationEvent, ApplicationDescriptor, WebAppEvent } from '@standardnotes/snjs'
 import {
@@ -41,7 +41,7 @@ type State = {
   arbitraryStatusMessage?: string
 }
 
-class Footer extends PureComponent<Props, State> {
+class Footer extends AbstractComponent<Props, State> {
   public user?: unknown
   private didCheckForOffline = false
   private completedInitialSync = false

packages/web/src/javascripts/Components/NoteGroupView/NoteGroupView.tsx

@@ -1,5 +1,5 @@
 import { FileItem, FileViewController, NoteViewController } from '@standardnotes/snjs'
-import { PureComponent } from '@/Components/Abstract/PureComponent'
+import { AbstractComponent } from '@/Components/Abstract/PureComponent'
 import { WebApplication } from '@/Application/Application'
 import MultipleSelectedNotes from '@/Components/MultipleSelectedNotes/MultipleSelectedNotes'
 import MultipleSelectedFiles from '../MultipleSelectedFiles/MultipleSelectedFiles'
@@ -22,7 +22,7 @@ type Props = {
   application: WebApplication
 }
 
-class NoteGroupView extends PureComponent<Props, State> {
+class NoteGroupView extends AbstractComponent<Props, State> {
   private removeChangeObserver!: () => void
 
   constructor(props: Props) {

packages/web/src/javascripts/Components/NoteView/NoteView.tsx

@@ -1,49 +1,50 @@
-import { ChangeEventHandler, createRef, KeyboardEventHandler, RefObject } from 'react'
+import { AbstractComponent } from '@/Components/Abstract/PureComponent'
+import ChangeEditorButton from '@/Components/ChangeEditor/ChangeEditorButton'
+import ComponentView from '@/Components/ComponentView/ComponentView'
+import NotesOptionsPanel from '@/Components/NotesOptions/NotesOptionsPanel'
+import PanelResizer, { PanelResizeType, PanelSide } from '@/Components/PanelResizer/PanelResizer'
+import PinNoteButton from '@/Components/PinNoteButton/PinNoteButton'
+import ProtectedItemOverlay from '@/Components/ProtectedItemOverlay/ProtectedItemOverlay'
+import { ElementIds } from '@/Constants/ElementIDs'
+import { PrefDefaults } from '@/Constants/PrefDefaults'
+import { StringDeleteNote, STRING_DELETE_LOCKED_ATTEMPT, STRING_DELETE_PLACEHOLDER_ATTEMPT } from '@/Constants/Strings'
+import { log, LoggingDomain } from '@/Logging'
+import { debounce, isDesktopApplication, isMobileScreen } from '@/Utils'
+import { classNames } from '@/Utils/ConcatenateClassNames'
 import {
   ApplicationEvent,
-  isPayloadSourceRetrieved,
-  isPayloadSourceInternalChange,
-  ContentType,
-  SNComponent,
-  SNNote,
   ComponentArea,
-  PrefKey,
   ComponentViewerInterface,
-  ProposedSecondsToDeferUILevelSessionExpirationDuringActiveInteraction,
+  ContentType,
+  EditorFontSize,
+  EditorLineHeight,
+  isPayloadSourceInternalChange,
+  isPayloadSourceRetrieved,
+  NoteType,
   NoteViewController,
   PayloadEmitSource,
+  PrefKey,
+  ProposedSecondsToDeferUILevelSessionExpirationDuringActiveInteraction,
+  SNComponent,
+  SNNote,
   WebAppEvent,
-  EditorLineHeight,
-  EditorFontSize,
-  NoteType,
 } from '@standardnotes/snjs'
-import { debounce, isDesktopApplication, isMobileScreen } from '@/Utils'
+import { confirmDialog, KeyboardKey, KeyboardModifier } from '@standardnotes/ui-services'
+import { ChangeEventHandler, createRef, KeyboardEventHandler, RefObject } from 'react'
 import { EditorEventSource } from '../../Types/EditorEventSource'
-import { confirmDialog, KeyboardModifier, KeyboardKey } from '@standardnotes/ui-services'
+import IndicatorCircle from '../IndicatorCircle/IndicatorCircle'
-import { STRING_DELETE_PLACEHOLDER_ATTEMPT, STRING_DELETE_LOCKED_ATTEMPT, StringDeleteNote } from '@/Constants/Strings'
+import LinkedItemBubblesContainer from '../LinkedItems/LinkedItemBubblesContainer'
-import { PureComponent } from '@/Components/Abstract/PureComponent'
+import LinkedItemsButton from '../LinkedItems/LinkedItemsButton'
-import ProtectedItemOverlay from '@/Components/ProtectedItemOverlay/ProtectedItemOverlay'
+import MobileItemsListButton from '../NoteGroupView/MobileItemsListButton'
-import PinNoteButton from '@/Components/PinNoteButton/PinNoteButton'
-import NotesOptionsPanel from '@/Components/NotesOptions/NotesOptionsPanel'
-import ComponentView from '@/Components/ComponentView/ComponentView'
-import PanelResizer, { PanelSide, PanelResizeType } from '@/Components/PanelResizer/PanelResizer'
-import { ElementIds } from '@/Constants/ElementIDs'
-import ChangeEditorButton from '@/Components/ChangeEditor/ChangeEditorButton'
 import EditingDisabledBanner from './EditingDisabledBanner'
+import { reloadFont } from './FontFunctions'
+import NoteStatusIndicator, { NoteStatus } from './NoteStatusIndicator'
+import NoteViewFileDropTarget from './NoteViewFileDropTarget'
+import { NoteViewProps } from './NoteViewProps'
 import {
   transactionForAssociateComponentWithCurrentNote,
   transactionForDisassociateComponentWithCurrentNote,
 } from './TransactionFunctions'
-import { reloadFont } from './FontFunctions'
-import { NoteViewProps } from './NoteViewProps'
-import IndicatorCircle from '../IndicatorCircle/IndicatorCircle'
-import { classNames } from '@/Utils/ConcatenateClassNames'
-import MobileItemsListButton from '../NoteGroupView/MobileItemsListButton'
-import LinkedItemBubblesContainer from '../LinkedItems/LinkedItemBubblesContainer'
-import NoteStatusIndicator, { NoteStatus } from './NoteStatusIndicator'
-import { PrefDefaults } from '@/Constants/PrefDefaults'
-import LinkedItemsButton from '../LinkedItems/LinkedItemsButton'
-import NoteViewFileDropTarget from './NoteViewFileDropTarget'
 
 const MinimumStatusDuration = 400
 const TextareaDebounce = 100
@@ -98,7 +99,7 @@ const PlaintextFontSizeMapping: Record<EditorFontSize, string> = {
   Large: 'text-xl',
 }
 
-class NoteView extends PureComponent<NoteViewProps, State> {
+class NoteView extends AbstractComponent<NoteViewProps, State> {
   readonly controller!: NoteViewController
 
   private statusTimeout?: NodeJS.Timeout
@@ -193,7 +194,7 @@ class NoteView extends PureComponent<NoteViewProps, State> {
     ;(this.onPanelResizeFinish as unknown) = undefined
     ;(this.stackComponentExpanded as unknown) = undefined
     ;(this.toggleStackComponent as unknown) = undefined
-    ;(this.onSystemEditorLoad as unknown) = undefined
+    ;(this.onSystemEditorRef as unknown) = undefined
     ;(this.debounceReloadEditorComponent as unknown) = undefined
     ;(this.textAreaChangeDebounceSave as unknown) = undefined
     ;(this.editorContentRef as unknown) = undefined
@@ -207,6 +208,24 @@ class NoteView extends PureComponent<NoteViewProps, State> {
     return this.controller.item
   }
 
+  override shouldComponentUpdate(_nextProps: Readonly<NoteViewProps>, nextState: Readonly<State>): boolean {
+    const complexObjects: (keyof State)[] = ['availableStackComponents', 'stackComponentViewers']
+    for (const key of Object.keys(nextState) as (keyof State)[]) {
+      if (complexObjects.includes(key)) {
+        continue
+      }
+      const prevValue = this.state[key]
+      const nextValue = nextState[key]
+
+      if (prevValue !== nextValue) {
+        log(LoggingDomain.NoteView, 'Rendering due to state change', key, prevValue, nextValue)
+        return true
+      }
+    }
+
+    return false
+  }
+
   override componentDidMount(): void {
     super.componentDidMount()
 
@@ -253,6 +272,8 @@ class NoteView extends PureComponent<NoteViewProps, State> {
   }
 
   onNoteInnerChange(note: SNNote, source: PayloadEmitSource): void {
+    log(LoggingDomain.NoteView, 'On inner note change', PayloadEmitSource[source])
+
     if (note.uuid !== this.note.uuid) {
       throw Error('Editor received changes for non-current note')
     }
@@ -431,12 +452,15 @@ class NoteView extends PureComponent<NoteViewProps, State> {
 
   streamItems() {
     this.removeComponentStreamObserver = this.application.streamItems(ContentType.Component, async ({ source }) => {
+      log(LoggingDomain.NoteView, 'On component stream observer', PayloadEmitSource[source])
       if (isPayloadSourceInternalChange(source) || source === PayloadEmitSource.InitialObserverRegistrationPush) {
         return
       }
+
       if (!this.note) {
         return
       }
+
       await this.reloadStackComponents()
       this.debounceReloadEditorComponent()
     })
@@ -454,6 +478,7 @@ class NoteView extends PureComponent<NoteViewProps, State> {
     if (this.state.editorComponentViewerDidAlreadyReload && !force) {
       return
     }
+
     const component = viewer.component
     this.application.componentManager.destroyComponentViewer(viewer)
     this.setState(
@@ -489,6 +514,7 @@ class NoteView extends PureComponent<NoteViewProps, State> {
   }
 
   async reloadEditorComponent() {
+    log(LoggingDomain.NoteView, 'Reload editor component')
     if (this.state.showProtectedWarning) {
       this.destroyCurrentEditorComponent()
       return
@@ -581,13 +607,16 @@ class NoteView extends PureComponent<NoteViewProps, State> {
 
   onTextAreaChange: ChangeEventHandler<HTMLTextAreaElement> = ({ currentTarget }) => {
     const text = currentTarget.value
+
     this.setState({
       editorText: text,
     })
+
     this.textAreaChangeDebounceSave()
   }
 
   textAreaChangeDebounceSave = () => {
+    log(LoggingDomain.NoteView, 'Performing save after debounce')
     this.controller
       .save({
         editorValues: {
@@ -609,10 +638,14 @@ class NoteView extends PureComponent<NoteViewProps, State> {
   }
 
   onTitleChange: ChangeEventHandler<HTMLInputElement> = ({ currentTarget }) => {
+    log(LoggingDomain.NoteView, 'Performing save after title change')
+
     const title = currentTarget.value
+
     this.setState({
       editorTitle: title,
     })
+
     this.controller
       .save({
         editorValues: {
@@ -662,10 +695,12 @@ class NoteView extends PureComponent<NoteViewProps, State> {
       this.application.alertService.alert(STRING_DELETE_PLACEHOLDER_ATTEMPT).catch(console.error)
       return
     }
+
     if (this.note.locked) {
       this.application.alertService.alert(STRING_DELETE_LOCKED_ATTEMPT).catch(console.error)
       return
     }
+
     const title = this.note.title.length ? `'${this.note.title}'` : 'this note'
     const text = StringDeleteNote(title, permanently)
     if (
@@ -727,6 +762,7 @@ class NoteView extends PureComponent<NoteViewProps, State> {
   }
 
   async reloadPreferences() {
+    log(LoggingDomain.NoteView, 'Reload preferences')
     const monospaceFont = this.application.getPreference(
       PrefKey.EditorMonospaceEnabled,
       PrefDefaults[PrefKey.EditorMonospaceEnabled],
@@ -776,9 +812,8 @@ class NoteView extends PureComponent<NoteViewProps, State> {
     }
   }
 
-  /** @components */
-
   async reloadStackComponents() {
+    log(LoggingDomain.NoteView, 'Reload stack components')
     const stackComponents = sortAlphabetically(
       this.application.componentManager
         .componentsForArea(ComponentArea.EditorStack)
@@ -844,10 +879,13 @@ class NoteView extends PureComponent<NoteViewProps, State> {
     })
   }
 
-  onSystemEditorLoad = (ref: HTMLTextAreaElement | null) => {
+  onSystemEditorRef = (ref: HTMLTextAreaElement | null) => {
     if (this.removeTabObserver || !ref) {
       return
     }
+
+    log(LoggingDomain.NoteView, 'On system editor ref')
+
     /**
      * Insert 4 spaces when a tab key is pressed,
      * only used when inside of the text editor.
@@ -1070,7 +1108,7 @@ class NoteView extends PureComponent<NoteViewProps, State> {
               onFocus={this.onContentFocus}
               onBlur={this.onContentBlur}
               readOnly={this.state.noteLocked}
-              ref={(ref) => ref && this.onSystemEditorLoad(ref)}
+              ref={(ref) => ref && this.onSystemEditorRef(ref)}
               spellCheck={this.state.spellcheck}
               value={this.state.editorText}
               className={classNames(

packages/web/src/javascripts/Components/PasswordWizard/PasswordWizard.tsx

@@ -1,6 +1,6 @@
 import { WebApplication } from '@/Application/Application'
 import { createRef } from 'react'
-import { PureComponent } from '@/Components/Abstract/PureComponent'
+import { AbstractComponent } from '@/Components/Abstract/PureComponent'
 import Button from '@/Components/Button/Button'
 import DecoratedPasswordInput from '../Input/DecoratedPasswordInput'
 import ModalDialog from '../Shared/ModalDialog'
@@ -38,7 +38,7 @@ type FormData = {
   status?: string
 }
 
-class PasswordWizard extends PureComponent<Props, State> {
+class PasswordWizard extends AbstractComponent<Props, State> {
   private currentPasswordInput = createRef<HTMLInputElement>()
 
   constructor(props: Props) {

packages/web/src/javascripts/Components/SyncResolutionMenu/SyncResolutionMenu.tsx

@@ -1,12 +1,12 @@
 import { WebApplication } from '@/Application/Application'
-import { PureComponent } from '@/Components/Abstract/PureComponent'
+import { AbstractComponent } from '@/Components/Abstract/PureComponent'
 
 type Props = {
   application: WebApplication
   close: () => void
 }
 
-class SyncResolutionMenu extends PureComponent<Props> {
+class SyncResolutionMenu extends AbstractComponent<Props> {
   constructor(props: Props) {
     super(props, props.application)
   }

packages/web/src/javascripts/Components/Tags/TagsListItem.tsx

@@ -28,6 +28,7 @@ import { mergeRefs } from '@/Hooks/mergeRefs'
 import { useFileDragNDrop } from '../FileDragNDropProvider/FileDragNDropProvider'
 import { LinkingController } from '@/Controllers/LinkingController'
 import { TagListSectionType } from './TagListSection'
+import { log, LoggingDomain } from '@/Logging'
 
 type Props = {
   tag: SNTag
@@ -237,6 +238,8 @@ export const TagsListItem: FunctionComponent<Props> = observer(
       }
     }, [addDragTarget, linkingController, removeDragTarget, tag])
 
+    log(LoggingDomain.NavigationList, 'Rendering TagsListItem')
+
     return (
       <>
         <div

packages/web/src/javascripts/Logging.ts

@@ -1,15 +1,22 @@
 import { log as utilsLog } from '@standardnotes/utils'
+import { isDev } from './Utils'
 
 export enum LoggingDomain {
   DailyNotes,
+  NoteView,
+  ItemsList,
+  NavigationList,
 }
 
 const LoggingStatus: Record<LoggingDomain, boolean> = {
   [LoggingDomain.DailyNotes]: false,
+  [LoggingDomain.NoteView]: false,
+  [LoggingDomain.ItemsList]: false,
+  [LoggingDomain.NavigationList]: false,
 }
 
 export function log(domain: LoggingDomain, ...args: any[]): void {
-  if (!LoggingStatus[domain]) {
+  if (!isDev || !LoggingStatus[domain]) {
     return
   }