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perf: use deferred value hook to increase performance

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The useDeferredValue hook renders the state change in the background and only applies it if the current value is the newest one.

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>
This commit is contained in:
Tilman Vatteroth 2023-07-05 21:29:33 +02:00
parent 4e497089f2
commit a303bb261f
1 changed files with 9 additions and 7 deletions
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16
frontend/src/components/render-page/render-page-content.tsx
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@ -16,13 +16,15 @@ import { CommunicationMessageType, RendererType } from './window-post-message-co
import { countWords } from './word-counter'
import type { SlideOptions } from '@hedgedoc/commons'
import { EventEmitter2 } from 'eventemitter2'
import React, { useCallback, useEffect, useMemo, useRef, useState } from 'react'
import React, { useCallback, useDeferredValue, useEffect, useMemo, useRef, useState } from 'react'
/**
* Wraps the markdown rendering in an iframe.
*/
export const RenderPageContent: React.FC = () => {
const [markdownContentLines, setMarkdownContentLines] = useState<string[]>([])
const [wantedMarkdownContentLines, setWantedMarkdownContentLines] = useState<string[]>([])
const deferredMarkdownContentLines = useDeferredValue(wantedMarkdownContentLines)
const [scrollState, setScrollState] = useState<ScrollState>({ firstLineInView: 1, scrolledPercentage: 0 })
const [baseConfiguration, setBaseConfiguration] = useState<BaseConfiguration | undefined>(undefined)
const communicator = useRendererToEditorCommunicator()
@ -49,7 +51,7 @@ export const RenderPageContent: React.FC = () => {
useRendererReceiveHandler(
CommunicationMessageType.SET_MARKDOWN_CONTENT,
useCallback((values) => setMarkdownContentLines(values.content), [])
useCallback((values) => setWantedMarkdownContentLines(values.content), [])
)
useRendererReceiveHandler(
@ -119,7 +121,7 @@ export const RenderPageContent: React.FC = () => {
case RendererType.DOCUMENT:
return (
<DocumentMarkdownRenderer
markdownContentLines={markdownContentLines}
markdownContentLines={deferredMarkdownContentLines}
onMakeScrollSource={onMakeScrollSource}
scrollState={scrollState}
onScroll={onScroll}
@ -131,7 +133,7 @@ export const RenderPageContent: React.FC = () => {
case RendererType.SLIDESHOW:
return (
<SlideshowMarkdownRenderer
markdownContentLines={markdownContentLines}
markdownContentLines={deferredMarkdownContentLines}
baseUrl={baseConfiguration.baseUrl}
newLinesAreBreaks={newLinesAreBreaks}
slideOptions={slideOptions}
@ -140,7 +142,7 @@ export const RenderPageContent: React.FC = () => {
case RendererType.SIMPLE:
return (
<SimpleMarkdownRenderer
markdownContentLines={markdownContentLines}
markdownContentLines={deferredMarkdownContentLines}
baseUrl={baseConfiguration.baseUrl}
newLinesAreBreaks={newLinesAreBreaks}
onHeightChange={onHeightChange}
@ -151,7 +153,7 @@ export const RenderPageContent: React.FC = () => {
}
}, [
baseConfiguration,
markdownContentLines,
deferredMarkdownContentLines,
newLinesAreBreaks,
onHeightChange,
onMakeScrollSource,