overleaf/services/web/frontend/js/shared/context/user-settings-context.tsx

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import {
createContext,
useContext,
useMemo,
Dispatch,
SetStateAction,
FC,
useState,
useEffect,
} from 'react'
import { UserSettings } from '../../../../types/user-settings'
import getMeta from '@/utils/meta'
const defaultSettings: UserSettings = {
pdfViewer: 'pdfjs',
autoComplete: true,
autoPairDelimiters: true,
syntaxValidation: false,
editorTheme: 'textmate',
overallTheme: '',
mode: 'default',
fontSize: 12,
fontFamily: 'monaco',
lineHeight: 'normal',
mathPreview: true,
}
type UserSettingsContextValue = {
userSettings: UserSettings
setUserSettings: Dispatch<
SetStateAction<UserSettingsContextValue['userSettings']>
>
}
export const UserSettingsContext = createContext<
UserSettingsContextValue | undefined
>(undefined)
export const UserSettingsProvider: FC = ({ children }) => {
const [userSettings, setUserSettings] = useState<
UserSettingsContextValue['userSettings']
>(() => getMeta('ol-userSettings') || defaultSettings)
const value = useMemo<UserSettingsContextValue>(
() => ({
userSettings,
setUserSettings,
}),
[userSettings, setUserSettings]
)
// Fire an event to inform non-React code of settings changes
useEffect(() => {
window.dispatchEvent(
new CustomEvent('settings:change', { detail: userSettings })
)
}, [userSettings])
return (
<UserSettingsContext.Provider value={value}>
{children}
</UserSettingsContext.Provider>
)
}
export function useUserSettingsContext() {
const context = useContext(UserSettingsContext)
if (!context) {
throw new Error(
'useUserSettingsContext is only available inside UserSettingsProvider'
)
}
return context
}