问使用视图pager2和嵌套导航正确使用导航组件

EN

class HomeViewModel(app:Application):AndroidViewModel(app), HomeParent {
}


intefrace HomeParent { //this contains all the actions that can be executed, like showLogin, showQuestions etc etc
    fun ShowLogin()
 
}

class HomeFragment: Fragment(), KoinComponent {
    private val vm by sharedViewModel<HomeViewModel>()

    private val pager by lazy { binding.pager }  //I just use view bindings you can do it with findviewbyid
    private val adapter by lazy { HomePageAdapter(this) }

    
    override fun initView(state:Bundle?) { //this is run before oncreate finishes
         pager.setPageTransformer(this::pageAnimation) //this is just to animate transitions
    }

    override fun setUpListeners() {  //this is run after oncreate finishes
        bottomNav.setOnNavigationItemSelectedListener(this::navigationItemSelected) //this does stuff and sends it to vm
        pager.registerOnPageChangeCallback(pagerChangeCallback)
    }

    override fun onResume() {
        super.onResume()
        pager.adapter = adapter
        (vm.state.value as? HomeState.Default)?.let { //I'm using mvi, this basically holds the current position in the pager
            pager.setCurrentItem(it.position.position, false)
        }
    }

    override fun onPause() {
        super.onPause()
        pager.adapter = null //I don't remember why I did this, I gues
    }

    override fun onDestroy() {
        super.onDestroy()
        pager.unregisterOnPageChangeCallback(pagerChangeCallback)
    }

}

class HomePageAdapter(fragment: Fragment) : FragmentStateAdapter(fragment) {
    override fun getItemCount() = 4

    override fun createFragment(position: Int): Fragment {
        return when (position) {
            0 -> Fragment1()
            1 -> Fragment2()
            2 -> Fragment3()
            3 -> Fragment4()
            else -> throw Throwable("Invalid position $position")
        }
    }
}

class Fragment1 :Fragment(),
    private val home : HomeParent by sharedViewModel<HomeViewModel>()
    override val vm: Fragment1ViewModel by viewModel { parametersOf(home) }

home.ShowLogin()

findNavController().navigate(HomeFragmentDirections.logIn())

@HiltViewModel
class OrderViewModel @Inject constructor(
    private val repository: Repository
) : ViewModel() {
    
    private val orderEventChannel = Channel<OrderEvent>()
    val orderEvent = orderEventChannel.receiveAsFlow()

    ...

    fun onInvoiceClicked(invoice: Invoice) = viewModelScope.launch {
        orderEventChannel.send(OrderEvent.NavigateToOrderDetailsFragment(invoice))
    }

    sealed class OrderEvent{
        data class NavigateToOrderDetailsFragment(val invoice: Invoice) : OrderEvent()
    }
}

@AndroidEntryPoint
class OrdersFragment : Fragment(R.layout.fragment_orders) {
    private val viewModel: OrderViewModel by activityViewModels()
    
        override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        
        ...
        
        viewLifecycleOwner.lifecycleScope.launchWhenStarted {
            viewModel.orderEvent.collect { event ->
                when(event){
                    is OrderViewModel.OrderEvent.NavigateToOrderDetailsFragment -> {
                        findNavController().navigate(
                            OrdersFragmentDirections.actionOrdersFragmentToOrderDetailsFragment(event.invoice)
                        )
                    }
                }
            }
        }
    }

class InProgressViewPagerFragment : Fragment(R.layout.fragment_in_progress_view_pager){
    private val viewModel: OrderViewModel by activityViewModels()
    
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        ...
        binding.invoice.setOnClickListener{
           viewModel.onInvoiceClicked(invoice)
        }
    }
}