attilakruchio

abstract class BaseFragment : Fragment() {

    abstract val viewModel: BaseViewModel

    @CallSuper
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        viewLifecycleOwner.lifecycleScope.launch {
            repeatOnLifecycle(Lifecycle.State.STARTED) {
                viewModel.events.collect { event ->
                    onEvent(event)

attilakruchio

open class BaseViewModel : ViewModel() {

    private val _events = Channel<SingleEvent>(Channel.UNLIMITED)
    val events = _events.receiveAsFlow()
}

attilakruchio

sealed interface SingleEvent
data class NavigateTo(
    val navDirections: NavDirections
) : SingleEvent

attilakruchio

@ActivityRetainedScoped
class Navigator @Inject constructor() {

    private val _navEvents = Channel<Direction>(Channel.UNLIMITED)
    val navEvents: Flow<Direction> = _navEvents.receiveAsFlow()

    fun navigateTo(navDirections: NavDirections) {
        _navEvents.trySend(Direction.NavigateTo(navDirections))
    }

attilakruchio

fun Navigator.setupWithNavController(
    activity: ComponentActivity, navController: NavController
) {
    activity.lifecycleScope.launch {
        activity.repeatOnLifecycle(Lifecycle.State.STARTED) {
            navEvents.collect { direction ->
                when (direction) {
                    is Navigator.Direction.NavigateTo -> {
                        navController.navigate(direction.navDirections)
                    }

attilakruchio

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"

attilakruchio

@HiltViewModel
class HomeViewModel @Inject constructor(
    private val navigator: Navigator
) : ViewModel() {

    fun navigateToSettings() {
        navigator.navigateTo(
            HomeFragmentDirections.showSettings()
        )
    }

attilakruchio

class HomeViewModel : ViewModel() {

    private val _state = MutableStateFlow(State())
    val state = _state.asStateFlow()

    init {
        loadContacts()
        loadDeliveryList()
    }

attilakruchio

class HomeViewModel : ViewModel() {

    private val _state = MutableStateFlow(State())
    val state = _state.asStateFlow()

    init {
        loadContacts()
        loadDeliveryList()
    }

attilakruchio

class HomeViewModel : ViewModel() {

    private val _contacts = MutableStateFlow<List<String>>(emptyList())
    private val _deliveryList = MutableStateFlow<List<String>>(emptyList())

    val state = combine(_contacts, _deliveryList) { contacts, deliveryList ->
        State(
            contactList = contacts,
            deliveryList = deliveryList,
        )