social-app / src / lib / hooks / useTabFocusEffect.ts

import {useEffect, useState} from 'react'
import {useNavigation} from '@react-navigation/native'
import {getTabState, TabState} from 'lib/routes/helpers'

export function useTabFocusEffect(
  tabName: string,
  cb: (isInside: boolean) => void,
) {
  const [isInside, setIsInside] = useState(false)

  // get root navigator state
  let nav = useNavigation()
  while (nav.getParent()) {
    nav = nav.getParent()
  }
  const state = nav.getState()

  useEffect(() => {
    // check if inside
    let v = getTabState(state, tabName) !== TabState.Outside
    if (v !== isInside) {
      // fire
      setIsInside(v)
      cb(v)
    }
  }, [state, isInside, setIsInside, tabName, cb])
}