backtrack-usage.kt

sealed class Routing {
    object ChildScreen1 : Routing()
    object ChildScreen2 : Routing()
    data class ChildScreen3(val foo: Bar) : Routing()
}

@Composable
fun MyParentComposable(defaultRouting: Routing) {
  
    BackHandler(defaultRouting) { backStack ->
        // backStack contains elements of Routing
        when (val routing = backStack.last()) {
            // compose further based on current routing
            // manipulate backStack with push/replace/etc. operations to trigger recompose
            // use back press on device to pop backstack and trigger recompose
        }
    }
}