mahdiPourkazemi

 The One-Shot Operation as a Cold Stream
//########################################################################
class MyViewModel(private val repository: DataRepository) : ViewModel() {
    private val _data = MutableStateFlow<UiState>(UiState.Loading)
    val data: StateFlow<UiState> = _data
    
    fun fetchData() {
        viewModelScope.launch {
            try {
                _data.value = UiState.Success(repository.fetchSomeData())

mahdiPourkazemi

@Composable
fun PriceScreen() {
    val originalPrice = 150.0

    val addTax = { price: Double -> price * 1.08 }
    val applyDiscount = { price: Double -> price * 0.85 }
    val roundPrice = { price: Double -> kotlin.math.round(price) }

    val finalPrice = processPrice(originalPrice, applyDiscount, addTax, roundPrice)

mahdiPourkazemi

//########LaunchedEffect####################
// first load in page: init vs Launched Effect
@Composable
fun MyScreen(userId: String) {
    LaunchedEffect(userId) {
        // هر بار userId تغییر کنه اجرا میشه
        val user = userRepository.getUser(userId)
        println(user.name)
    }
}

mahdiPourkazemi

// UiState بهبود یافته با generic type
sealed class UiState<out T> {
    object Loading : UiState<Nothing>()
    data class Success<T>(val data: T) : UiState<T>()
    data class Error(
        val throwable: Throwable,
        val userMessage: String,
        val isRetryable: Boolean = true
    ) : UiState<Nothing>()
}

mahdiPourkazemi

class SearchViewModel : ViewModel() {
    private val _searchQuery = MutableSharedFlow<String>()
    
    val searchResults: StateFlow<UiState<List<SearchResult>>> = _searchQuery
        .debounce(300) // صبر می‌کنه تا کاربر تایپ کردن رو تموم کنه
        .filter { it.length >= 3 } // حداقل 3 کاراکتر
        .flatMapLatest { query ->
            if (query.isEmpty()) {
                flowOf(UiState.Success(emptyList()))
            } else {

mahdiPourkazemi

@Composable
fun Float.dpToPx(): Float = with(LocalDensity.current) { this@dpToPx.dp.toPx() }

@Composable
fun Int.dpToPx(): Float = with(LocalDensity.current) { this@dpToPx.dp.toPx() }

val circleRadius = 12.dp.dpToPx()

fun <T> SnapshotStateList<T>.toggle(item: T) {
    if (contains(item)) remove(item) else add(item)

mahdiPourkazemi

fun String.toAnnotatedTextWithArabicDiacritics(
    diacriticsStyle: SpanStyle = SpanStyle(color = Color.Red)
): AnnotatedString {
    val builder = AnnotatedString.Builder()
    
    // اعراب عربی که باید قرمز شوند
    val arabicDiacritics = setOf(
        '\u064B', // فتحتان (ً)
        '\u064C', // ضمتان (ٌ)

mahdiPourkazemi

@Qualifier
@Retention(AnnotationRetention.BINARY)
annotation class SharedPreferencesFileNameKey

@Qualifier
@Retention(AnnotationRetention.BINARY)
annotation class LanguageCodeKey

@Module
@InstallIn(SingletonComponent::class)

mahdiPourkazemi

// ========== روش 1: استفاده از Interface  ==========
fun interface OnItemClickListener {
    fun onItemClick(item: String)
    
    companion object {
        fun withLogging(
            tag: String = "ListItemClick",
            messagePrefix: String = "Clicked on: ",
            action: (String) -> Unit
        ): OnItemClickListener {

mahdiPourkazemi

import android.os.Build
import android.os.Bundle
import android.os.Parcelable
import androidx.navigation.NavType
import kotlinx.parcelize.Parcelize
import kotlinx.serialization.Serializable
import kotlinx.serialization.encodeToString
import kotlinx.serialization.decodeFromString
import kotlinx.serialization.json.Json