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Refactor DateDifferenceViewModel

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This commit is contained in:
sadellie 2023-08-01 23:07:13 +03:00
parent 79269dcea5
commit 9815484706
1 changed files with 8 additions and 19 deletions
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27
feature/datedifference/src/main/java/com/sadellie/unitto/feature/datedifference/difference/DateDifferenceViewModel.kt
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@ -20,15 +20,12 @@ package com.sadellie.unitto.feature.datedifference.difference
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import com.sadellie.unitto.feature.datedifference.ZonedDateTimeDifference
import com.sadellie.unitto.feature.datedifference.minus
import dagger.hilt.android.lifecycle.HiltViewModel
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.SharingStarted
import kotlinx.coroutines.flow.collectLatest
import kotlinx.coroutines.flow.combine
import kotlinx.coroutines.flow.merge
import kotlinx.coroutines.flow.onEach
import kotlinx.coroutines.flow.stateIn
import kotlinx.coroutines.flow.update
import kotlinx.coroutines.launch
@ -37,27 +34,19 @@ import javax.inject.Inject
@HiltViewModel
internal class DateDifferenceViewModel @Inject constructor() : ViewModel() {
private val _start = MutableStateFlow(ZonedDateTime.now())
private val _end = MutableStateFlow(ZonedDateTime.now())
private val _result = MutableStateFlow<ZonedDateTimeDifference>(ZonedDateTimeDifference.Zero)
private val _uiState = MutableStateFlow(DifferenceUIState())
val uiState = combine(_start, _end, _result) { start, end, result ->
return@combine DifferenceUIState(start, end, result)
}
val uiState = _uiState
.onEach { updateResult() }
.stateIn(
viewModelScope, SharingStarted.WhileSubscribed(5000L), DifferenceUIState()
)
fun setStartDate(dateTime: ZonedDateTime) = _start.update { dateTime }
fun setStartDate(newValue: ZonedDateTime) = _uiState.update { it.copy(start = newValue) }
fun setEndDate(dateTime: ZonedDateTime) = _end.update { dateTime }
fun setEndDate(newValue: ZonedDateTime) = _uiState.update { it.copy(end = newValue) }
init {
viewModelScope.launch(Dispatchers.Default) {
merge(_start, _end).collectLatest {
val difference = _start.value - _end.value
_result.update { difference }
}
}
private fun updateResult() = viewModelScope.launch(Dispatchers.Default) {
_uiState.update { ui -> ui.copy(result = ui.start - ui.end) }
}
}