catalinghita8

@Composable
private fun CategoryDetailsCollapsingToolbar(category: FoodItem?) {
    Row {
        Image(modifier = Modifier.size(128.dp), ...)
        Column {
            Text(text = category?.name)
            Text(
                text = category.description,
                maxLines = 6
            )

catalinghita8

@Composable
fun FoodCategoryDetailsScreen(state: FoodCategoryDetailsContract.State) {
    Column {
        CategoryDetailsCollapsingToolbar(state.category)
        Spacer(modifier = Modifier.height(2.dp))
        LazyColumn {
            items(state.categoryFoodItems) { item ->
                FoodItemRow(item = item)
            }
        }

catalinghita8

@Composable
private fun FoodApp() {
    val viewModel: FoodCategoriesViewModel = viewModel()
    val state = viewModel.viewState.value
    FoodCategoriesScreen(
        state = state,
        effectFlow = viewModel.effect,
        onEventSent = { event -> viewModel.setEvent(event) },
        onNavigationRequested = { navigationEffect ->
            if (navigationEffect is FoodCategoriesContract.Effect.Navigation.ToCategoryDetails) {

catalinghita8

@Composable
fun FoodCategoriesScreen(
    state: FoodCategoriesContract.State,
    effectFlow: Flow<FoodCategoriesContract.Effect>?,
    onEventSent: (event: FoodCategoriesContract.Event) -> Unit,
    onNavigationRequested: (navigationEffect: FoodCategoriesContract.Effect.Navigation) -> Unit
) {
    // Listen for side effects from the VM
    LaunchedEffect(LAUNCH_LISTEN_FOR_EFFECTS) {
        effectFlow?.onEach { effect ->

catalinghita8

class FoodCategoriesViewModel constructor(private val repository: FoodMenuRepository) :
    BaseViewModel<
        FoodCategoriesContract.Event, 
        FoodCategoriesContract.State,
        FoodCategoriesContract.Effect>() {

    init {
        viewModelScope.launch { getFoodCategories() }
    }

catalinghita8

class FoodCategoriesContract {
    sealed class Event : ViewEvent {
        data class CategorySelection(val categoryName: String) : Event()
    }
    
    data class State(val categories: List<FoodItem> = listOf(), val isLoading: Boolean = false) : ViewState

    sealed class Effect : ViewSideEffect {
        object ToastDataWasLoaded : Effect()

catalinghita8

abstract class BaseViewModel
                    <Event : ViewEvent,
                     UiState : ViewState, 
                     Effect : ViewSideEffect> : ViewModel() {

    private val initialState: UiState by lazy { setInitialState() }
    abstract fun setInitialState(): UiState

    private val _viewState: MutableState<UiState> = mutableStateOf(initialState)
    val viewState: State<UiState> = _viewState

catalinghita8

interface ViewState

interface ViewEvent

interface ViewSideEffect

catalinghita8

import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.appcompat.app.AppCompatActivity
import androidx.compose.foundation.BorderStroke
import androidx.compose.foundation.Image
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape

catalinghita8

import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.appcompat.app.AppCompatActivity
import androidx.compose.foundation.BorderStroke
import androidx.compose.foundation.Image
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape