NavigationComponentSubscribeWithDestinationCheck.kt

navEvents.subscribe {
    when (it.destination) {
        NavEvent.Destination.ONE -> navController.popBackStack(R.id.fragmentOne, false)
        NavEvent.Destination.TWO -> navController.navigate(R.id.action_fragmentOne_to_fragmentTwo)
        NavEvent.Destination.THREE -> when (navController.currentDestination!!.id) {
            R.id.fragmentOne -> navController.navigate(R.id.action_fragmentOne_to_fragmentThree)
            R.id.fragmentTwo -> navController.navigate(R.id.action_fragmentTwo_to_fragmentThree)
        }
        NavEvent.Destination.FOUR -> navController.navigate(R.id.action_fragmentTwo_to_fragmentFour)
    }
}