HarryTylenol

@Composable
fun LottoTheme(
    content : @Composable () -> Unit
) {

    MaterialTheme(
        content = content
    )

}

HarryTylenol

@Composable
fun ConstraintLayoutScope.t2t(
    ref: ConstrainedLayoutReference? = null,
    margin: Dp = 0.dp
): Constraint = {
    val reference = ref ?: parent
    top.linkTo(reference.top, margin)
}

HarryTylenol

fun <T> intentExtra(defaultValue: T? = null) = object : ReadOnlyProperty<Activity, T?> {
    override fun getValue(thisRef: Activity, property: KProperty<*>): T? {
        return when (defaultValue) {
            is String -> thisRef.intent.getStringExtra(property.name) as T
            is Int -> thisRef.intent.getIntExtra(property.name, defaultValue) as T
            is Long -> thisRef.intent.getLongExtra(property.name, defaultValue) as T
            // And More...
            else -> null
        }
    }

HarryTylenol

binding.btnRequest.setOnClickListener { 
    viewModel.requestFestival( ... ) 
}
binding.btnRetry.setOnClickListener { 
    viewModel.refreshFestival() 
}
viewModel.festival.observer {
    // 페스티벌 데이터가 나옵니다.
}
val observer = { state: NetworkState? ->

HarryTylenol

private val festivalRequest = MutableLiveData<An>()
private val festivalResponse = festivalRequest.map { getFestivalUseCase.execute(it) }

val festival = festivalResponse.switchMap { it.data }
val festivalState = festivalResponse.switchMap { it.state }
val festivalRefreshState = festivalResponse.switchMap { it.refreshState }

HarryTylenol

fun getFestival( ... ): ResponseWrapper<FestivalData> {
    val request: suspend () -> Unit = {
        val festival = festivalAPI.get( ... )
        ("Festival API" to "Fetched from API").debug()
        festivalDAO.insert(festival)
        ("Festival DAO" to "Inserted to DB").debug()
    }
    val refreshTrigger = MutableLiveData<Unit>()
    val refreshState = refresh.switchMap {
        ("Festival Refresh" to "Refresh Request").debug()

HarryTylenol

private fun createStateForRequest(request: suspend () -> Unit) = 
// LiveData (Lifecycle) 2.2.0-alph01 버전 부터 지원
  liveData(Dispatchers.IO) {
    emit(NetworkState.loading)
    try {
        request()
        emit(NetworkState.success)
    } catch (e: IOException) {
        e.printStackTrace()
        emit(NetworkState.failed(e))

HarryTylenol

// ResponseWrapper

data class ResponseWrapper<T>(
    val data: LiveData<T>,
    val state: LiveData<NetworkState>,
    val refreshState: LiveData<NetworkState>,
    val refresh: () -> Unit
)

// NetworkState

HarryTylenol

// FestivalAPI
@GET(" ... ")
suspend fun get( ... ): FestivalData

// ...

// FestivalDAO
@Query("select * from festivals ...")
fun get( ... ): LiveData<FestivalData>

HarryTylenol

inline fun date(timeInMillis: Long = System.currentTimeMillis(), block: SimpleDate.() -> Unit = {}): SimpleDate {
    val dateDsl = SimpleDate()
    dateDsl.timeInMillis = timeInMillis
    block(dateDsl)
    return dateDsl
}


class SimpleDate {