src/state/shell/light-status-bar.tsx


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import {createContext, useContext, useEffect, useState} from 'react'

import {isWeb} from '#/platform/detection'

const LightStatusBarRefCountContext = createContext<boolean>(false)
const SetLightStatusBarRefCountContext = createContext<React.Dispatch<
  React.SetStateAction<number>
> | null>(null)

export function useLightStatusBar() {
  return useContext(LightStatusBarRefCountContext)
}

export function useSetLightStatusBar(enabled: boolean) {
  const setRefCount = useContext(SetLightStatusBarRefCountContext)
  useEffect(() => {
    // noop on web -sfn
    if (isWeb) return

    if (!setRefCount) {
      if (__DEV__)
        console.error(
          'useLightStatusBar was used without a SetLightStatusBarRefCountContext provider',
        )
      return
    }
    if (enabled) {
      setRefCount(prev => prev + 1)
      return () => setRefCount(prev => prev - 1)
    }
  }, [enabled, setRefCount])
}

export function Provider({children}: React.PropsWithChildren<{}>) {
  const [refCount, setRefCount] = useState(0)

  return (
    <SetLightStatusBarRefCountContext.Provider value={setRefCount}>
      <LightStatusBarRefCountContext.Provider value={refCount > 0}>
        {children}
      </LightStatusBarRefCountContext.Provider>
    </SetLightStatusBarRefCountContext.Provider>
  )
}