overleaf/services/web/frontend/js/features/ide-react/components/loading.tsx

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import { FC, useEffect, useState } from 'react'
import LoadingBranded from '@/shared/components/loading-branded'
import useWaitForI18n from '@/shared/hooks/use-wait-for-i18n'
import getMeta from '@/utils/meta'
import { useConnectionContext } from '../context/connection-context'
import { useIdeReactContext } from '@/features/ide-react/context/ide-react-context'
type Part = 'initial' | 'render' | 'connection' | 'translations' | 'project'
const initialParts = new Set<Part>(['initial'])
const totalParts = new Set<Part>([
'initial',
'render',
'connection',
'translations',
'project',
])
export const Loading: FC<{
setLoaded: (value: boolean) => void
}> = ({ setLoaded }) => {
const [loadedParts, setLoadedParts] = useState(initialParts)
const progress = (loadedParts.size / totalParts.size) * 100
useEffect(() => {
setLoaded(progress === 100)
}, [progress, setLoaded])
const { connectionState, isConnected } = useConnectionContext()
const i18n = useWaitForI18n()
const { projectJoined } = useIdeReactContext()
useEffect(() => {
setLoadedParts(value => new Set(value).add('render'))
}, [])
useEffect(() => {
if (isConnected) {
setLoadedParts(value => new Set(value).add('connection'))
}
}, [isConnected])
useEffect(() => {
if (i18n.isReady) {
setLoadedParts(value => new Set(value).add('translations'))
}
}, [i18n.isReady])
useEffect(() => {
if (projectJoined) {
setLoadedParts(value => new Set(value).add('project'))
}
}, [projectJoined])
const getLoadingScreenError = (): string => {
if (connectionState.error) {
// NOTE: translations not ready yet
return connectionState.error === 'io-not-loaded'
? 'Could not connect to websocket server :('
: connectionState.error
}
if (i18n.error) {
return getMeta('ol-translationLoadErrorMessage')
}
return ''
}
// Use loading text from the server, because i18n will not be ready initially
const label = getMeta('ol-loadingText')
const hasError = Boolean(connectionState.error || i18n.error)
return (
<div className="loading-screen">
<LoadingBranded
loadProgress={progress}
label={label}
hasError={hasError}
/>
{hasError && (
<p className="loading-screen-error">{getLoadingScreenError()}</p>
)}
</div>
)
}