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Use produceState

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This commit is contained in:
Benoit Marty
2024-10-08 14:15:23 +02:00
parent a0205cf1e9
commit 2b9899063c
1 changed files with 11 additions and 13 deletions
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24
features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/typing/TypingNotificationPresenter.kt
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@@ -9,10 +9,11 @@ package io.element.android.features.messages.impl.typing
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.MutableState
import androidx.compose.runtime.ProduceStateScope
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.produceState
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import io.element.android.libraries.architecture.Presenter
@@ -22,8 +23,9 @@ import io.element.android.libraries.matrix.api.room.RoomMember
import io.element.android.libraries.matrix.api.room.RoomMembershipState
import io.element.android.libraries.matrix.api.room.roomMembers
import io.element.android.libraries.preferences.api.store.SessionPreferencesStore
import kotlinx.collections.immutable.ImmutableList
import kotlinx.collections.immutable.persistentListOf
import kotlinx.collections.immutable.toImmutableList
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.flow.combine
import kotlinx.coroutines.flow.distinctUntilChanged
import kotlinx.coroutines.flow.launchIn
@@ -36,33 +38,29 @@ class TypingNotificationPresenter @Inject constructor(
) : Presenter<TypingNotificationState> {
@Composable
override fun present(): TypingNotificationState {
val typingMembersState = remember { mutableStateOf(emptyList<RoomMember>()) }
val renderTypingNotifications by sessionPreferencesStore.isRenderTypingNotificationsEnabled().collectAsState(initial = true)
LaunchedEffect(renderTypingNotifications) {
val typingMembersState by produceState(initialValue = persistentListOf(), key1 = renderTypingNotifications) {
if (renderTypingNotifications) {
observeRoomTypingMembers(typingMembersState)
} else {
typingMembersState.value = emptyList()
observeRoomTypingMembers()
}
}
// This will keep the space reserved for the typing notifications after the first one is displayed
var reserveSpace by remember { mutableStateOf(false) }
LaunchedEffect(renderTypingNotifications, typingMembersState.value) {
if (renderTypingNotifications && typingMembersState.value.isNotEmpty()) {
LaunchedEffect(renderTypingNotifications, typingMembersState) {
if (renderTypingNotifications && typingMembersState.isNotEmpty()) {
reserveSpace = true
}
}
return TypingNotificationState(
renderTypingNotifications = renderTypingNotifications,
typingMembers = typingMembersState.value.toImmutableList(),
typingMembers = typingMembersState,
reserveSpace = reserveSpace,
)
}
private fun CoroutineScope.observeRoomTypingMembers(typingMembersState: MutableState<List<RoomMember>>) {
private fun ProduceStateScope<ImmutableList<RoomMember>>.observeRoomTypingMembers() {
combine(room.roomTypingMembersFlow, room.membersStateFlow) { typingMembers, membersState ->
typingMembers
.map { userId ->
@@ -73,7 +71,7 @@ class TypingNotificationPresenter @Inject constructor(
}
.distinctUntilChanged()
.onEach { members ->
typingMembersState.value = members
value = members.toImmutableList()
}
.launchIn(this)
}