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@file:Suppress("EXPERIMENTAL_API_USAGE") | |
package my.something.t | |
import kotlinx.coroutines.delay | |
import kotlinx.coroutines.flow.Flow | |
import kotlinx.coroutines.flow.collect | |
import kotlinx.coroutines.flow.flow | |
import kotlinx.coroutines.flow.take | |
import kotlinx.io.IOException | |
data class ViewState(val content: String?, val loading: Boolean, val showError: Boolean) | |
fun contentFlow(): Flow<String> { | |
return flow { | |
var index = 0 | |
while (true) { | |
index++ | |
if (index == 10) { | |
throw IOException() | |
} | |
delay(250) | |
emit(index.toString()) | |
} | |
} | |
} | |
fun viewState(repeat: Flow<Unit>): Flow<ViewState> { | |
val initialState = ViewState(content = null, loading = true, showError = false) | |
return flow { | |
emit(initialState) | |
var lastState = initialState | |
suspend fun updateAndEmit(update: ViewState.() -> ViewState) { | |
lastState = update(lastState) | |
emit(lastState) | |
} | |
suspend fun startContentFlow() { | |
try { | |
contentFlow().collect { | |
updateAndEmit { copy(content = it, loading = false) } | |
} | |
} catch (t: IOException) { | |
updateAndEmit { copy(loading = false, showError = true) } | |
repeat.take(1).collect { | |
updateAndEmit { copy(loading = true, showError = false) } | |
startContentFlow() | |
} | |
} | |
} | |
startContentFlow() | |
} | |
} |
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