Don't use mutable shared flows in UI (#4346)

app/src/main/java/com/keylesspalace/tusky/appstore/EventsHub.kt

@@ -15,11 +15,11 @@ interface Event
 @Singleton
 class EventHub @Inject constructor() {
 
-    private val sharedEventFlow = MutableSharedFlow<Event>()
-    val events: SharedFlow<Event> = sharedEventFlow.asSharedFlow()
+    private val _events = MutableSharedFlow<Event>()
+    val events: SharedFlow<Event> = _events.asSharedFlow()
 
     suspend fun dispatch(event: Event) {
-        sharedEventFlow.emit(event)
+        _events.emit(event)
     }
 
     //  TODO remove as soon as NotificationsFragment is Kotlin

app/src/main/java/com/keylesspalace/tusky/components/account/list/ListsForAccountViewModel.kt

@@ -28,6 +28,7 @@ import javax.inject.Inject
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.asSharedFlow
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
 
@@ -53,13 +54,13 @@ class ListsForAccountViewModel @Inject constructor(
 ) : ViewModel() {
 
     private val _states = MutableSharedFlow<List<AccountListState>>(1)
-    val states: SharedFlow<List<AccountListState>> = _states
+    val states: SharedFlow<List<AccountListState>> = _states.asSharedFlow()
 
     private val _loadError = MutableSharedFlow<Throwable>(1)
-    val loadError: SharedFlow<Throwable> = _loadError
+    val loadError: SharedFlow<Throwable> = _loadError.asSharedFlow()
 
     private val _actionError = MutableSharedFlow<ActionError>(1)
-    val actionError: SharedFlow<ActionError> = _actionError
+    val actionError: SharedFlow<ActionError> = _actionError.asSharedFlow()
 
     fun load(accountId: String?) {
         _loadError.resetReplayCache()

app/src/main/java/com/keylesspalace/tusky/components/compose/ComposeViewModel.kt

@@ -47,6 +47,7 @@ import kotlinx.coroutines.flow.SharedFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asFlow
+import kotlinx.coroutines.flow.asSharedFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.shareIn
@@ -107,12 +108,12 @@ class ComposeViewModel @Inject constructor(
     private val _media = MutableStateFlow(emptyList<QueuedMedia>())
     val media: StateFlow<List<QueuedMedia>> = _media.asStateFlow()
 
-    val uploadError =
-        MutableSharedFlow<Throwable>(
-            replay = 0,
-            extraBufferCapacity = 1,
-            onBufferOverflow = BufferOverflow.DROP_OLDEST
-        )
+    private val _uploadError = MutableSharedFlow<Throwable>(
+        replay = 0,
+        extraBufferCapacity = 1,
+        onBufferOverflow = BufferOverflow.DROP_OLDEST
+    )
+    val uploadError: SharedFlow<Throwable> = _uploadError.asSharedFlow()
 
     private val _closeConfirmation = MutableStateFlow(ConfirmationKind.NONE)
     val closeConfirmation: StateFlow<ConfirmationKind> = _closeConfirmation.asStateFlow()
@@ -202,7 +203,7 @@ class ComposeViewModel @Inject constructor(
                             )
                         is UploadEvent.ErrorEvent -> {
                             _media.update { mediaList -> mediaList.filter { it.localId != mediaItem.localId } }
-                            uploadError.emit(event.error)
+                            _uploadError.emit(event.error)
                             return@collect
                         }
                     }

app/src/main/java/com/keylesspalace/tusky/components/domainblocks/DomainBlocksViewModel.kt

@@ -10,6 +10,8 @@ import at.connyduck.calladapter.networkresult.onFailure
 import com.keylesspalace.tusky.R
 import javax.inject.Inject
 import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.asSharedFlow
 import kotlinx.coroutines.launch
 
 class DomainBlocksViewModel @Inject constructor(
@@ -18,12 +20,13 @@ class DomainBlocksViewModel @Inject constructor(
 
     val domainPager = repo.domainPager.cachedIn(viewModelScope)
 
-    val uiEvents = MutableSharedFlow<SnackbarEvent>()
+    private val _uiEvents = MutableSharedFlow<SnackbarEvent>()
+    val uiEvents: SharedFlow<SnackbarEvent> = _uiEvents.asSharedFlow()
 
     fun block(domain: String) {
         viewModelScope.launch {
             repo.block(domain).onFailure { e ->
-                uiEvents.emit(
+                _uiEvents.emit(
                     SnackbarEvent(
                         message = R.string.error_blocking_domain,
                         domain = domain,
@@ -39,7 +42,7 @@ class DomainBlocksViewModel @Inject constructor(
     fun unblock(domain: String) {
         viewModelScope.launch {
             repo.unblock(domain).fold({
-                uiEvents.emit(
+                _uiEvents.emit(
                     SnackbarEvent(
                         message = R.string.confirmation_domain_unmuted,
                         domain = domain,
@@ -49,7 +52,7 @@ class DomainBlocksViewModel @Inject constructor(
                     )
                 )
             }, { e ->
-                uiEvents.emit(
+                _uiEvents.emit(
                     SnackbarEvent(
                         message = R.string.error_unblocking_domain,
                         domain = domain,

app/src/main/java/com/keylesspalace/tusky/components/filters/FiltersViewModel.kt

@@ -11,8 +11,9 @@ import com.keylesspalace.tusky.entity.Filter
 import com.keylesspalace.tusky.network.MastodonApi
 import com.keylesspalace.tusky.util.isHttpNotFound
 import javax.inject.Inject
-import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.launch
 
 class FiltersViewModel @Inject constructor(
@@ -30,8 +31,8 @@ class FiltersViewModel @Inject constructor(
 
     data class State(val filters: List<Filter>, val loadingState: LoadingState)
 
-    val state: Flow<State> get() = _state
     private val _state = MutableStateFlow(State(emptyList(), LoadingState.INITIAL))
+    val state: StateFlow<State> = _state.asStateFlow()
 
     fun load() {
         this@FiltersViewModel._state.value = _state.value.copy(loadingState = LoadingState.LOADING)

app/src/main/java/com/keylesspalace/tusky/components/viewthread/ViewThreadViewModel.kt

@@ -51,6 +51,8 @@ import kotlinx.coroutines.channels.BufferOverflow
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.asSharedFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
@@ -68,14 +70,12 @@ class ViewThreadViewModel @Inject constructor(
     private val _uiState = MutableStateFlow(ThreadUiState.Loading as ThreadUiState)
     val uiState: Flow<ThreadUiState> = _uiState.asStateFlow()
 
-    private val _errors =
-        MutableSharedFlow<Throwable>(
-            replay = 0,
-            extraBufferCapacity = 1,
-            onBufferOverflow = BufferOverflow.DROP_OLDEST
-        )
-    val errors: Flow<Throwable>
-        get() = _errors
+    private val _errors = MutableSharedFlow<Throwable>(
+        replay = 0,
+        extraBufferCapacity = 1,
+        onBufferOverflow = BufferOverflow.DROP_OLDEST
+    )
+    val errors: SharedFlow<Throwable> = _errors.asSharedFlow()
 
     var isInitialLoad: Boolean = true
 

app/src/main/java/com/keylesspalace/tusky/viewmodel/ListsViewModel.kt

@@ -27,9 +27,12 @@ import java.io.IOException
 import java.net.ConnectException
 import javax.inject.Inject
 import kotlinx.coroutines.channels.BufferOverflow
-import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.launch
 
 internal class ListsViewModel @Inject constructor(private val api: MastodonApi) : ViewModel() {
@@ -49,15 +52,15 @@ internal class ListsViewModel @Inject constructor(private val api: MastodonApi)
 
     data class State(val lists: List<MastoList>, val loadingState: LoadingState)
 
-    val state: Flow<State> get() = _state
-    val events: Flow<Event> get() = _events
     private val _state = MutableStateFlow(State(listOf(), LoadingState.INITIAL))
-    private val _events =
-        MutableSharedFlow<Event>(
-            replay = 0,
-            extraBufferCapacity = 1,
-            onBufferOverflow = BufferOverflow.DROP_OLDEST
-        )
+    val state: StateFlow<State> = _state.asStateFlow()
+
+    private val _events = MutableSharedFlow<Event>(
+        replay = 0,
+        extraBufferCapacity = 1,
+        onBufferOverflow = BufferOverflow.DROP_OLDEST
+    )
+    val events: SharedFlow<Event> = _events.asSharedFlow()
 
     fun retryLoading() {
         loadIfNeeded()