k0siara

class DiffUtilCallback(
    private val oldItems: List,
    private val newItems: List
) : DiffUtil.Callback() {

    override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
        return oldItems[oldItemPosition].id == newItems[newItemPosition].id
    }

    override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {

k0siara

fun renderItems(newItems: List){
    val diffResult: DiffUtil.DiffResult = DiffUtil.calculateDiff(DiffUtilCallback(oldItems, newItems))
    diffResult.dispatchUpdatesTo(this) // this : RecyclerView.Adapter
}

k0siara

class CustomAdapter : ListAdapter<Item, ItemViewHolder>(DiffUtilCallback) {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): SpotViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.item, parent, false)
        return ItemViewHolder(view)
    }

    override fun onBindViewHolder(holder: ItemViewHolder, position: Int) {
        holder.bind(currentList[position])
    }

k0siara

class FlowObserver<T>(
    lifecycleOwner: LifecycleOwner,
    private val flow: Flow<T>,
    private val collector: suspend (T) -> Unit
) {

    private var job: Job? = null

    init {
        lifecycleOwner.lifecycle.addObserver(

k0siara

// ViewModel with some Flows to observe and collect

abstract class BaseViewModel<STATE, EVENT : UiEvent, EFFECT : UiEffect>(
    initialState: UiState<STATE> = UiState.Loading
) : ViewModel() {
  
    ...

    private val _uiState: MutableStateFlow<UiState<STATE>> = MutableStateFlow(initialState)
    val uiState = _uiState.asStateFlow()

k0siara

// ViewModel with SharedFlow and StateFlow

abstract class BaseViewModel<STATE, EVENT : UiEvent, EFFECT : UiEffect>(
    initialState: UiState<STATE> = UiState.Loading
) : ViewModel() {
  
    ...

    // Get Current State
    val currentState: UiState<STATE>

k0siara

class AddEmployeeViewModel(
    private val employeeRepository: EmployeeRepository
) :
    BaseViewModel<AddEmployeeContract.State, AddEmployeeContract.Event, AddEmployeeContract.Effect>(
        initialState = AddEmployeeContract.State.Loading()
    ) {

    ...

    override fun handleEvent(event: AddEmployeeContract.Event) {

k0siara

class ExampleViewModel(
    private val initialState: ExampleViewState
) : ViewModel() {
    private val _uiState: MutableStateFlow<ExampleViewState> = MutableStateFlow(initialState)
    val uiState = _uiState.asStateFlow()
}

data class ExampleViewState(
    val title: String = "",
    val description: String = ""

k0siara

_uiState.value = _uiState.value.copy(title = "Something")

k0siara

_uiState.update { it.copy(title = "Something") }