kopia lustrzana https://github.com/vitorpamplona/amethyst
71 wiersze
2.0 KiB
Kotlin
71 wiersze
2.0 KiB
Kotlin
package com.vitorpamplona.amethyst.ui.screen
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import androidx.lifecycle.ViewModel
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import androidx.lifecycle.viewModelScope
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import com.vitorpamplona.amethyst.model.LocalCache
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import com.vitorpamplona.amethyst.model.LocalCacheState
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import com.vitorpamplona.amethyst.model.Note
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import com.vitorpamplona.amethyst.service.NostrDataSource
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import com.vitorpamplona.amethyst.service.model.ReactionEvent
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import kotlinx.coroutines.cancel
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import kotlinx.coroutines.flow.MutableStateFlow
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import kotlinx.coroutines.flow.asStateFlow
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import kotlinx.coroutines.flow.update
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import kotlinx.coroutines.launch
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class FeedViewModel(val dataSource: NostrDataSource): ViewModel() {
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private val _feedContent = MutableStateFlow<FeedState>(FeedState.Loading)
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val feedContent = _feedContent.asStateFlow()
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fun refresh() {
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// For some reason, view Model Scope doesn't call
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viewModelScope.launch {
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refreshSuspend()
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}
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}
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fun refreshSuspend() {
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val notes = dataSource.loadTop()
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val oldNotesState = feedContent.value
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if (oldNotesState is FeedState.Loaded) {
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if (notes != oldNotesState.feed) {
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updateFeed(notes)
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}
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} else {
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updateFeed(notes)
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}
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}
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fun updateFeed(notes: List<Note>) {
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if (notes.isEmpty()) {
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_feedContent.update { FeedState.Empty }
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} else {
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_feedContent.update { FeedState.Loaded(notes) }
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}
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}
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fun refreshCurrentList() {
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val state = feedContent.value
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if (state is FeedState.Loaded) {
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_feedContent.update { FeedState.Loaded(state.feed) }
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}
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}
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private val cacheListener: (LocalCacheState) -> Unit = {
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refresh()
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}
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init {
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LocalCache.live.observeForever(cacheListener)
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}
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override fun onCleared() {
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LocalCache.live.removeObserver(cacheListener)
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dataSource.stop()
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viewModelScope.cancel()
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super.onCleared()
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}
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} |