separated screens for friends tab

feature/friends/src/main/kotlin/dev/meloda/fast/friends/FriendsViewModel.kt

@@ -18,7 +18,6 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.update
 
-// TODO: 13/07/2024, Danil Nikolaev: separate two lists and their pagination
 interface FriendsViewModel {
 
     val screenState: StateFlow<FriendsScreenState>
@@ -33,19 +32,11 @@ interface FriendsViewModel {
 
     fun onErrorConsumed()
 
-    fun onTabSelected(tabIndex: Int)
-
     fun setScrollIndex(index: Int)
     fun setScrollOffset(offset: Int)
-    fun setScrollIndexOnline(index: Int)
-    fun setScrollOffsetOnline(offset: Int)
 }
 
-class FriendsViewModelImpl(
-    private val friendsUseCase: FriendsUseCase,
-    private val userSettings: UserSettings,
-    private val loadUsersByIdsUseCase: LoadUsersByIdsUseCase
-) : ViewModel(), FriendsViewModel {
+abstract class BaseFriendsViewModelImpl : ViewModel(), FriendsViewModel {
 
     override val screenState = MutableStateFlow(FriendsScreenState.EMPTY)
 
@@ -54,13 +45,7 @@ class FriendsViewModelImpl(
     override val currentOffset = MutableStateFlow(0)
     override val canPaginate = MutableStateFlow(false)
 
-    private val friends = MutableStateFlow<List<VkUser>>(emptyList())
-
-    init {
-        userSettings.useContactNames.listenValue(viewModelScope, ::updateFriendsNames)
-
-        loadFriends()
-    }
+    protected val friends = MutableStateFlow<List<VkUser>>(emptyList())
 
     override fun onPaginationConditionsMet() {
         currentOffset.update { screenState.value.friends.size }
@@ -76,10 +61,6 @@ class FriendsViewModelImpl(
         baseError.setValue { null }
     }
 
-    override fun onTabSelected(tabIndex: Int) {
-        screenState.setValue { old -> old.copy(selectedTabIndex = tabIndex) }
-    }
-
     override fun setScrollIndex(index: Int) {
         screenState.setValue { old -> old.copy(scrollIndex = index) }
     }
@@ -88,38 +69,75 @@ class FriendsViewModelImpl(
         screenState.setValue { old -> old.copy(scrollOffset = offset) }
     }
 
-    override fun setScrollIndexOnline(index: Int) {
-        screenState.setValue { old -> old.copy(scrollIndexOnline = index) }
-    }
+    abstract fun loadFriends(offset: Int = currentOffset.value)
 
-    override fun setScrollOffsetOnline(offset: Int) {
-        screenState.setValue { old -> old.copy(scrollOffsetOnline = offset) }
-    }
-
-    private fun loadFriends(offset: Int = currentOffset.value) {
-        friendsUseCase.getOnlineFriends(null, null)
-            .listenValue(viewModelScope) { state ->
-                state.processState(
-                    error = ::handleError,
-                    success = { userIds ->
-                        loadUsersByIdsUseCase(userIds = userIds)
-                            .listenValue(viewModelScope) { state ->
-                                state.processState(
-                                    error = ::handleError,
-                                    success = { onlineFriends ->
-                                        screenState.setValue { old ->
-                                            old.copy(
-                                                onlineFriends = onlineFriends.map {
-                                                    it.asPresentation(userSettings.useContactNames.value)
-                                                }
-                                            )
-                                        }
-                                    }
-                                )
-                            }
+    protected fun handleError(error: State.Error) {
+        when (error) {
+            is State.Error.ApiError -> {
+                when (error.errorCode) {
+                    VkErrorCode.USER_AUTHORIZATION_FAILED -> {
+                        baseError.setValue { BaseError.SessionExpired }
                     }
-                )
+
+                    else -> {
+                        baseError.setValue {
+                            BaseError.SimpleError(message = error.errorMessage)
+                        }
+                    }
+                }
             }
+
+            State.Error.ConnectionError -> {
+                baseError.setValue {
+                    BaseError.SimpleError(message = "Connection error")
+                }
+            }
+
+            State.Error.InternalError -> {
+                baseError.setValue {
+                    BaseError.SimpleError(message = "Internal error")
+                }
+            }
+
+            State.Error.UnknownError -> {
+                baseError.setValue {
+                    BaseError.SimpleError(message = "Unknown error")
+                }
+            }
+
+            else -> Unit
+        }
+    }
+
+    protected fun updateFriendsNames(useContactNames: Boolean) {
+        val friends = friends.value
+        if (friends.isEmpty()) return
+
+        val uiFriends = friends.map { conversation ->
+            conversation.asPresentation(useContactNames)
+        }
+
+        screenState.setValue { old ->
+            old.copy(friends = uiFriends)
+        }
+    }
+
+    companion object {
+        const val LOAD_COUNT = 30
+    }
+}
+
+class FriendsViewModelImpl(
+    private val friendsUseCase: FriendsUseCase,
+    private val userSettings: UserSettings
+) : BaseFriendsViewModelImpl() {
+
+    init {
+        userSettings.useContactNames.listenValue(viewModelScope, ::updateFriendsNames)
+        loadFriends()
+    }
+
+    override fun loadFriends(offset: Int) {
         friendsUseCase.getFriends(count = LOAD_COUNT, offset = offset)
             .listenValue(viewModelScope) { state ->
                 state.processState(
@@ -167,62 +185,48 @@ class FriendsViewModelImpl(
                 }
             }
     }
+}
 
-    private fun handleError(error: State.Error) {
-        when (error) {
-            is State.Error.ApiError -> {
-                when (error.errorCode) {
-                    VkErrorCode.USER_AUTHORIZATION_FAILED -> {
-                        baseError.setValue { BaseError.SessionExpired }
-                    }
+class OnlineFriendsViewModelImpl(
+    private val friendsUseCase: FriendsUseCase,
+    private val userSettings: UserSettings,
+    private val loadUsersByIdsUseCase: LoadUsersByIdsUseCase
+) : BaseFriendsViewModelImpl() {
 
-                    else -> {
-                        baseError.setValue {
-                            BaseError.SimpleError(message = error.errorMessage)
+    init {
+        userSettings.useContactNames.listenValue(viewModelScope, ::updateFriendsNames)
+        loadFriends()
+    }
+
+    override fun loadFriends(offset: Int) {
+        friendsUseCase.getOnlineFriends(null, null)
+            .listenValue(viewModelScope) { onlineState ->
+                onlineState.processState(
+                    error = ::handleError,
+                    success = { userIds ->
+                        loadUsersByIdsUseCase(userIds = userIds).listenValue(viewModelScope) { state ->
+                            state.processState(
+                                error = ::handleError,
+                                success = { onlineFriends ->
+                                    screenState.setValue { old ->
+                                        old.copy(
+                                            friends = onlineFriends.map {
+                                                it.asPresentation(userSettings.useContactNames.value)
+                                            }
+                                        )
+                                    }
+                                }
+                            )
+
+                            screenState.setValue { old ->
+                                old.copy(
+                                    isLoading = offset == 0 && (onlineState.isLoading() || state.isLoading()),
+                                    isPaginating = offset > 0 && (onlineState.isLoading() || state.isLoading())
+                                )
+                            }
                         }
                     }
-                }
+                )
             }
-            State.Error.ConnectionError -> {
-                baseError.setValue {
-                    BaseError.SimpleError(message = "Connection error")
-                }
-            }
-            State.Error.InternalError -> {
-                baseError.setValue {
-                    BaseError.SimpleError(message = "Internal error")
-                }
-            }
-            State.Error.UnknownError -> {
-                baseError.setValue {
-                    BaseError.SimpleError(message = "Unknown error")
-                }
-            }
-            else -> Unit
-        }
-    }
-
-    private fun updateFriendsNames(useContactNames: Boolean) {
-        val friends = friends.value
-        if (friends.isEmpty()) return
-
-        val uiFriends = friends.map { conversation ->
-            conversation.asPresentation(useContactNames)
-        }
-
-        val onlineUiFriends = screenState.value.onlineFriends.mapNotNull { friend ->
-            uiFriends.find { it.userId == friend.userId }
-        }
-
-        screenState.setValue { old ->
-            old.copy(
-                friends = uiFriends,
-                onlineFriends = onlineUiFriends
-            )
-        }
-    }
-
-    companion object {
-        const val LOAD_COUNT = 15
     }
 }

feature/friends/src/main/kotlin/dev/meloda/fast/friends/di/FriendsModule.kt

@@ -1,8 +1,9 @@
 package dev.meloda.fast.friends.di
 
 import dev.meloda.fast.domain.FriendsUseCase
-import dev.meloda.fast.friends.FriendsViewModelImpl
 import dev.meloda.fast.domain.FriendsUseCaseImpl
+import dev.meloda.fast.friends.FriendsViewModelImpl
+import dev.meloda.fast.friends.OnlineFriendsViewModelImpl
 import org.koin.core.module.dsl.singleOf
 import org.koin.core.module.dsl.viewModelOf
 import org.koin.dsl.bind
@@ -11,4 +12,5 @@ import org.koin.dsl.module
 val friendsModule = module {
     singleOf(::FriendsUseCaseImpl) bind FriendsUseCase::class
     viewModelOf(::FriendsViewModelImpl)
+    viewModelOf(::OnlineFriendsViewModelImpl)
 }

feature/friends/src/main/kotlin/dev/meloda/fast/friends/model/FriendsScreenState.kt

@@ -7,28 +7,20 @@ import dev.meloda.fast.ui.model.api.UiFriend
 data class FriendsScreenState(
     val isLoading: Boolean,
     val friends: List<UiFriend>,
-    val onlineFriends: List<UiFriend>,
     val isPaginating: Boolean,
     val isPaginationExhausted: Boolean,
-    val selectedTabIndex: Int,
     val scrollIndex: Int,
     val scrollOffset: Int,
-    val scrollIndexOnline: Int,
-    val scrollOffsetOnline: Int
 ) {
 
     companion object {
         val EMPTY: FriendsScreenState = FriendsScreenState(
             isLoading = true,
             friends = emptyList(),
-            onlineFriends = emptyList(),
             isPaginating = false,
             isPaginationExhausted = false,
-            selectedTabIndex = 0,
             scrollIndex = 0,
-            scrollOffset = 0,
-            scrollIndexOnline = 0,
-            scrollOffsetOnline = 0,
+            scrollOffset = 0
         )
     }
 }

feature/friends/src/main/kotlin/dev/meloda/fast/friends/navigation/FriendsNavigation.kt

@@ -1,13 +1,9 @@
 package dev.meloda.fast.friends.navigation
 
-import androidx.navigation.NavController
 import androidx.navigation.NavGraphBuilder
 import androidx.navigation.compose.composable
-import dev.meloda.fast.friends.FriendsViewModel
-import dev.meloda.fast.friends.FriendsViewModelImpl
 import dev.meloda.fast.friends.presentation.FriendsRoute
 import dev.meloda.fast.model.BaseError
-import dev.meloda.fast.ui.extensions.sharedViewModel
 import kotlinx.serialization.Serializable
 
 @Serializable
@@ -15,17 +11,12 @@ object Friends
 
 fun NavGraphBuilder.friendsScreen(
     onError: (BaseError) -> Unit,
-    navController: NavController,
     onPhotoClicked: (url: String) -> Unit,
     onMessageClicked: (userId: Int) -> Unit
 ) {
     composable<Friends> {
-        val viewModel: FriendsViewModel =
-            it.sharedViewModel<FriendsViewModelImpl>(navController = navController)
-
         FriendsRoute(
             onError = onError,
-            viewModel = viewModel,
             onPhotoClicked = onPhotoClicked,
             onMessageClicked = onMessageClicked
         )

feature/friends/src/main/kotlin/dev/meloda/fast/friends/presentation/FriendsScreen.kt

@@ -1,81 +1,64 @@
 package dev.meloda.fast.friends.presentation
 
-import androidx.compose.animation.animateColorAsState
-import androidx.compose.animation.core.FastOutLinearInEasing
-import androidx.compose.animation.core.animateFloatAsState
-import androidx.compose.animation.core.tween
-import androidx.compose.foundation.background
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.WindowInsets
+import android.content.Context
+import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.calculateEndPadding
 import androidx.compose.foundation.layout.calculateStartPadding
 import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.statusBars
 import androidx.compose.foundation.lazy.rememberLazyListState
-import androidx.compose.foundation.pager.HorizontalPager
-import androidx.compose.foundation.pager.rememberPagerState
 import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.PrimaryTabRow
-import androidx.compose.material3.Scaffold
-import androidx.compose.material3.Tab
-import androidx.compose.material3.Text
-import androidx.compose.material3.TopAppBar
-import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.material3.pulltorefresh.PullToRefreshBox
 import androidx.compose.material3.pulltorefresh.PullToRefreshDefaults
 import androidx.compose.material3.pulltorefresh.rememberPullToRefreshState
-import androidx.compose.material3.surfaceColorAtElevation
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
 import androidx.compose.runtime.snapshotFlow
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.LayoutDirection
-import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import coil.imageLoader
 import coil.request.ImageRequest
-import dev.chrisbanes.haze.hazeEffect
 import dev.chrisbanes.haze.hazeSource
-import dev.chrisbanes.haze.materials.ExperimentalHazeMaterialsApi
-import dev.chrisbanes.haze.materials.HazeMaterials
 import dev.meloda.fast.friends.FriendsViewModel
 import dev.meloda.fast.friends.FriendsViewModelImpl
-import dev.meloda.fast.friends.model.FriendsScreenState
+import dev.meloda.fast.friends.OnlineFriendsViewModelImpl
 import dev.meloda.fast.model.BaseError
+import dev.meloda.fast.ui.R
 import dev.meloda.fast.ui.components.ErrorView
 import dev.meloda.fast.ui.components.FullScreenLoader
 import dev.meloda.fast.ui.components.NoItemsView
-import dev.meloda.fast.ui.model.TabItem
 import dev.meloda.fast.ui.theme.LocalHazeState
 import dev.meloda.fast.ui.theme.LocalThemeConfig
 import dev.meloda.fast.ui.util.ImmutableList
 import kotlinx.coroutines.flow.collectLatest
 import kotlinx.coroutines.flow.debounce
 import org.koin.androidx.compose.koinViewModel
-import dev.meloda.fast.ui.R as UiR
 
+@OptIn(ExperimentalMaterial3Api::class)
 @Composable
-fun FriendsRoute(
-    onError: (BaseError) -> Unit,
-    onPhotoClicked: (url: String) -> Unit,
-    onMessageClicked: (userId: Int) -> Unit,
-    viewModel: FriendsViewModel = koinViewModel<FriendsViewModelImpl>()
+fun FriendsScreen(
+    modifier: Modifier = Modifier,
+    padding: PaddingValues,
+    tabIndex: Int,
+    onSessionExpiredLogOutButtonClicked: () -> Unit = {},
+    onPhotoClicked: (url: String) -> Unit = {},
+    onMessageClicked: (userId: Int) -> Unit = {},
+    setCanScrollBackward: (Boolean) -> Unit = {}
 ) {
-    val context = LocalContext.current
+    val context: Context = LocalContext.current
+    val viewModel: FriendsViewModel =
+        if (tabIndex == 0) {
+            koinViewModel<FriendsViewModelImpl>()
+        } else {
+            koinViewModel<OnlineFriendsViewModelImpl>()
+        }
 
     val screenState by viewModel.screenState.collectAsStateWithLifecycle()
     val baseError by viewModel.baseError.collectAsStateWithLifecycle()
@@ -92,43 +75,6 @@ fun FriendsRoute(
         }
     }
 
-    FriendsScreen(
-        screenState = screenState,
-        baseError = baseError,
-        canPaginate = canPaginate,
-        onSessionExpiredLogOutButtonClicked = { onError(BaseError.SessionExpired) },
-        onPaginationConditionsMet = viewModel::onPaginationConditionsMet,
-        onRefresh = viewModel::onRefresh,
-        onPhotoClicked = onPhotoClicked,
-        onMessageClicked = onMessageClicked,
-        setSelectedTabIndex = viewModel::onTabSelected,
-        setScrollIndex = viewModel::setScrollIndex,
-        setScrollOffset = viewModel::setScrollOffset,
-        setScrollIndexOnline = viewModel::setScrollIndexOnline,
-        setScrollOffsetOnline = viewModel::setScrollOffsetOnline
-    )
-}
-
-@OptIn(
-    ExperimentalMaterial3Api::class,
-    ExperimentalHazeMaterialsApi::class
-)
-@Composable
-fun FriendsScreen(
-    screenState: FriendsScreenState = FriendsScreenState.EMPTY,
-    baseError: BaseError? = null,
-    canPaginate: Boolean = false,
-    onSessionExpiredLogOutButtonClicked: () -> Unit = {},
-    onPaginationConditionsMet: () -> Unit = {},
-    onRefresh: () -> Unit = {},
-    onPhotoClicked: (url: String) -> Unit = {},
-    onMessageClicked: (userId: Int) -> Unit = {},
-    setSelectedTabIndex: (Int) -> Unit = {},
-    setScrollIndex: (Int) -> Unit = {},
-    setScrollOffset: (Int) -> Unit = {},
-    setScrollIndexOnline: (Int) -> Unit = {},
-    setScrollOffsetOnline: (Int) -> Unit = {}
-) {
     val currentTheme = LocalThemeConfig.current
 
     val maxLines by remember {
@@ -141,33 +87,17 @@ fun FriendsScreen(
         initialFirstVisibleItemIndex = screenState.scrollIndex,
         initialFirstVisibleItemScrollOffset = screenState.scrollOffset
     )
-    val listStateOnline = rememberLazyListState(
-        initialFirstVisibleItemIndex = screenState.scrollIndexOnline,
-        initialFirstVisibleItemScrollOffset = screenState.scrollOffsetOnline
-    )
 
     LaunchedEffect(listState) {
         snapshotFlow { listState.firstVisibleItemIndex }
-            .debounce(500L)
-            .collectLatest(setScrollIndex)
+            .debounce(250L)
+            .collectLatest(viewModel::setScrollIndex)
     }
 
     LaunchedEffect(listState) {
         snapshotFlow { listState.firstVisibleItemScrollOffset }
-            .debounce(500L)
-            .collectLatest(setScrollOffset)
-    }
-
-    LaunchedEffect(listStateOnline) {
-        snapshotFlow { listStateOnline.firstVisibleItemIndex }
-            .debounce(500L)
-            .collectLatest(setScrollIndexOnline)
-    }
-
-    LaunchedEffect(listStateOnline) {
-        snapshotFlow { listStateOnline.firstVisibleItemScrollOffset }
-            .debounce(500L)
-            .collectLatest(setScrollOffsetOnline)
+            .debounce(250L)
+            .collectLatest(viewModel::setScrollOffset)
     }
 
     val paginationConditionMet by remember(canPaginate, listState) {
@@ -180,209 +110,81 @@ fun FriendsScreen(
 
     LaunchedEffect(paginationConditionMet) {
         if (paginationConditionMet && !screenState.isPaginating) {
-            onPaginationConditionsMet()
+            viewModel.onPaginationConditionsMet()
         }
     }
 
     val hazeState = LocalHazeState.current
 
-    var canScrollBackward by remember {
-        mutableStateOf(false)
-    }
-
-    val topBarContainerColorAlpha by animateFloatAsState(
-        targetValue = if (!currentTheme.enableBlur || !canScrollBackward) 1f else 0f,
-        label = "toolbarColorAlpha",
-        animationSpec = tween(
-            durationMillis = 200,
-            easing = FastOutLinearInEasing
-        )
-    )
-
-    val topBarContainerColor by animateColorAsState(
-        targetValue = if (currentTheme.enableBlur || !canScrollBackward)
-            MaterialTheme.colorScheme.surface
-        else
-            MaterialTheme.colorScheme.surfaceColorAtElevation(3.dp),
-        label = "toolbarColorAlpha",
-        animationSpec = tween(
-            durationMillis = 200,
-            easing = FastOutLinearInEasing
-        )
-    )
-
-    val tabItems = remember {
-        listOf(
-            TabItem(
-                titleResId = UiR.string.title_friends_all,
-                unselectedIconResId = null,
-                selectedIconResId = null
-            ),
-            TabItem(
-                titleResId = UiR.string.title_friends_online,
-                unselectedIconResId = null,
-                selectedIconResId = null
-            )
-        )
-    }
-
-    Scaffold(
-        modifier = Modifier.fillMaxSize(),
-        contentWindowInsets = WindowInsets.statusBars,
-        topBar = {
-            Column(
-                modifier = Modifier
-                    .then(
-                        if (currentTheme.enableBlur) {
-                            Modifier.hazeEffect(
-                                state = hazeState,
-                                style = HazeMaterials.thick()
-                            )
-                        } else {
-                            Modifier
-                        }
-                    )
-                    .background(topBarContainerColor.copy(alpha = topBarContainerColorAlpha))
-                    .fillMaxWidth()
-            ) {
-                TopAppBar(
-                    title = {
-                        Text(
-                            text = stringResource(id = UiR.string.title_friends),
-                            maxLines = 1,
-                            overflow = TextOverflow.Ellipsis,
-                            style = MaterialTheme.typography.headlineSmall
-                        )
-                    },
-                    colors = TopAppBarDefaults.topAppBarColors(
-                        containerColor = Color.Transparent
-                    ),
-                    modifier = Modifier.fillMaxWidth()
+    baseError?.let { error ->
+        when (error) {
+            is BaseError.SessionExpired -> {
+                ErrorView(
+                    text = stringResource(R.string.session_expired),
+                    buttonText = stringResource(R.string.action_log_out),
+                    onButtonClick = onSessionExpiredLogOutButtonClicked
+                )
+            }
+
+            is BaseError.SimpleError -> {
+                ErrorView(
+                    text = error.message,
+                    buttonText = stringResource(R.string.try_again),
+                    onButtonClick = viewModel::onRefresh
                 )
-                PrimaryTabRow(
-                    selectedTabIndex = screenState.selectedTabIndex,
-                    modifier = Modifier,
-                    containerColor = Color.Transparent
-                ) {
-                    tabItems.forEachIndexed { index, item ->
-                        Tab(
-                            selected = index == screenState.selectedTabIndex,
-                            onClick = {
-                                if (screenState.selectedTabIndex != index) {
-                                    setSelectedTabIndex(index)
-                                }
-                            },
-                            text = {
-                                item.titleResId?.let { resId ->
-                                    Text(text = stringResource(id = resId))
-                                }
-                            }
-                        )
-                    }
-                }
             }
         }
-    ) { padding ->
-        when {
-            baseError != null -> {
-                when (baseError) {
-                    is BaseError.SessionExpired -> {
-                        ErrorView(
-                            text = stringResource(UiR.string.session_expired),
-                            buttonText = stringResource(UiR.string.action_log_out),
-                            onButtonClick = onSessionExpiredLogOutButtonClicked
-                        )
-                    }
 
-                    is BaseError.SimpleError -> {
-                        ErrorView(
-                            text = baseError.message,
-                            buttonText = stringResource(UiR.string.try_again),
-                            onButtonClick = onRefresh
-                        )
-                    }
+        return
+    }
+
+    when {
+        screenState.isLoading && screenState.friends.isEmpty() -> FullScreenLoader()
+
+        else -> {
+            val pullToRefreshState = rememberPullToRefreshState()
+
+            PullToRefreshBox(
+                modifier = modifier
+                    .fillMaxSize()
+                    .padding(start = padding.calculateStartPadding(LayoutDirection.Ltr))
+                    .padding(end = padding.calculateEndPadding(LayoutDirection.Ltr))
+                    .padding(bottom = padding.calculateBottomPadding()),
+                state = pullToRefreshState,
+                isRefreshing = screenState.isLoading,
+                onRefresh = viewModel::onRefresh,
+                indicator = {
+                    PullToRefreshDefaults.Indicator(
+                        state = pullToRefreshState,
+                        isRefreshing = screenState.isLoading,
+                        modifier = Modifier
+                            .align(Alignment.TopCenter)
+                            .padding(top = padding.calculateTopPadding()),
+                    )
                 }
-            }
+            ) {
+                FriendsList(
+                    modifier = if (currentTheme.enableBlur) {
+                        Modifier.hazeSource(state = hazeState)
+                    } else {
+                        Modifier
+                    }.fillMaxSize(),
+                    screenState = screenState,
+                    uiFriends = ImmutableList.copyOf(screenState.friends),
+                    listState = listState,
+                    maxLines = maxLines,
+                    padding = padding,
+                    onPhotoClicked = onPhotoClicked,
+                    onMessageClicked = onMessageClicked,
+                    setCanScrollBackward = setCanScrollBackward
+                )
 
-            screenState.isLoading && screenState.friends.isEmpty() -> FullScreenLoader()
-
-            else -> {
-                val pagerState = rememberPagerState(
-                    initialPage = screenState.selectedTabIndex
-                ) {
-                    tabItems.size
-                }
-
-                LaunchedEffect(screenState.selectedTabIndex) {
-                    pagerState.animateScrollToPage(screenState.selectedTabIndex)
-                }
-
-                LaunchedEffect(pagerState) {
-                    snapshotFlow { pagerState.currentPage }
-                        .collect(setSelectedTabIndex)
-                }
-
-                val pullToRefreshState = rememberPullToRefreshState()
-
-                Box(modifier = Modifier.fillMaxSize()) {
-                    HorizontalPager(
-                        state = pagerState,
-                        modifier = Modifier.fillMaxSize(),
-                    ) { index ->
-                        PullToRefreshBox(
-                            modifier = Modifier
-                                .fillMaxSize()
-                                .padding(start = padding.calculateStartPadding(LayoutDirection.Ltr))
-                                .padding(end = padding.calculateEndPadding(LayoutDirection.Ltr))
-                                .padding(bottom = padding.calculateBottomPadding()),
-                            state = pullToRefreshState,
-                            isRefreshing = screenState.isLoading,
-                            onRefresh = onRefresh,
-                            indicator = {
-                                PullToRefreshDefaults.Indicator(
-                                    state = pullToRefreshState,
-                                    isRefreshing = screenState.isLoading,
-                                    modifier = Modifier
-                                        .align(Alignment.TopCenter)
-                                        .padding(top = padding.calculateTopPadding()),
-                                )
-                            }
-                        ) {
-                            val friendsToDisplay = remember(index) {
-                                if (index == 0) {
-                                    screenState.friends
-                                } else {
-                                    screenState.onlineFriends
-                                }
-                            }
-
-                            FriendsList(
-                                modifier = if (currentTheme.enableBlur) {
-                                    Modifier.hazeSource(state = hazeState)
-                                } else {
-                                    Modifier
-                                }.fillMaxSize(),
-                                screenState = screenState,
-                                uiFriends = ImmutableList.copyOf(friendsToDisplay),
-                                listState = if (index == 0) listState else listStateOnline,
-                                maxLines = maxLines,
-                                padding = padding,
-                                onPhotoClicked = onPhotoClicked,
-                                onMessageClicked = onMessageClicked,
-                                setCanScrollBackward = { can ->
-                                    canScrollBackward = can
-                                }
-                            )
-
-                            if (friendsToDisplay.isEmpty()) {
-                                NoItemsView(
-                                    customText = if (index == 1) stringResource(UiR.string.no_online_friends) else null,
-                                    buttonText = stringResource(UiR.string.action_refresh),
-                                    onButtonClick = onRefresh
-                                )
-                            }
-                        }
-                    }
+                if (screenState.friends.isEmpty()) {
+                    NoItemsView(
+                        customText = if (tabIndex == 1) stringResource(R.string.no_online_friends) else null,
+                        buttonText = stringResource(R.string.action_refresh),
+                        onButtonClick = viewModel::onRefresh
+                    )
                 }
             }
         }

feature/friends/src/main/kotlin/dev/meloda/fast/friends/presentation/RootFriendsScreen.kt

@@ -0,0 +1,187 @@
+package dev.meloda.fast.friends.presentation
+
+import androidx.compose.animation.animateColorAsState
+import androidx.compose.animation.core.FastOutLinearInEasing
+import androidx.compose.animation.core.animateFloatAsState
+import androidx.compose.animation.core.tween
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.statusBars
+import androidx.compose.foundation.pager.HorizontalPager
+import androidx.compose.foundation.pager.rememberPagerState
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.PrimaryTabRow
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Tab
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.material3.surfaceColorAtElevation
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.runtime.snapshotFlow
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import dev.chrisbanes.haze.hazeEffect
+import dev.chrisbanes.haze.materials.ExperimentalHazeMaterialsApi
+import dev.chrisbanes.haze.materials.HazeMaterials
+import dev.meloda.fast.model.BaseError
+import dev.meloda.fast.ui.R
+import dev.meloda.fast.ui.model.TabItem
+import dev.meloda.fast.ui.theme.LocalHazeState
+import dev.meloda.fast.ui.theme.LocalThemeConfig
+
+@OptIn(ExperimentalMaterial3Api::class, ExperimentalHazeMaterialsApi::class)
+@Composable
+fun FriendsRoute(
+    onError: (BaseError) -> Unit,
+    onPhotoClicked: (url: String) -> Unit,
+    onMessageClicked: (userId: Int) -> Unit,
+) {
+    var selectedTabIndex by rememberSaveable {
+        mutableIntStateOf(0)
+    }
+
+    val currentTheme = LocalThemeConfig.current
+    val hazeState = LocalHazeState.current
+
+    var canScrollBackward by remember {
+        mutableStateOf(false)
+    }
+
+    val topBarContainerColorAlpha by animateFloatAsState(
+        targetValue = if (!currentTheme.enableBlur || !canScrollBackward) 1f else 0f,
+        label = "toolbarColorAlpha",
+        animationSpec = tween(
+            durationMillis = 200,
+            easing = FastOutLinearInEasing
+        )
+    )
+
+    val topBarContainerColor by animateColorAsState(
+        targetValue = if (currentTheme.enableBlur || !canScrollBackward)
+            MaterialTheme.colorScheme.surface
+        else
+            MaterialTheme.colorScheme.surfaceColorAtElevation(3.dp),
+        label = "toolbarColorAlpha",
+        animationSpec = tween(
+            durationMillis = 200,
+            easing = FastOutLinearInEasing
+        )
+    )
+
+    val tabItems = remember {
+        listOf(
+            TabItem(
+                titleResId = R.string.title_friends_all,
+                unselectedIconResId = null,
+                selectedIconResId = null
+            ),
+            TabItem(
+                titleResId = R.string.title_friends_online,
+                unselectedIconResId = null,
+                selectedIconResId = null
+            )
+        )
+    }
+
+    Scaffold(
+        modifier = Modifier.fillMaxSize(),
+        contentWindowInsets = WindowInsets.statusBars,
+        topBar = {
+            Column(
+                modifier = Modifier
+                    .then(
+                        if (currentTheme.enableBlur) {
+                            Modifier.hazeEffect(
+                                state = hazeState,
+                                style = HazeMaterials.thick()
+                            )
+                        } else {
+                            Modifier
+                        }
+                    )
+                    .background(topBarContainerColor.copy(alpha = topBarContainerColorAlpha))
+                    .fillMaxWidth()
+            ) {
+                TopAppBar(
+                    title = {
+                        Text(
+                            text = stringResource(id = R.string.title_friends),
+                            maxLines = 1,
+                            overflow = TextOverflow.Ellipsis,
+                            style = MaterialTheme.typography.headlineSmall
+                        )
+                    },
+                    colors = TopAppBarDefaults.topAppBarColors(
+                        containerColor = Color.Transparent
+                    ),
+                    modifier = Modifier.fillMaxWidth()
+                )
+                PrimaryTabRow(
+                    selectedTabIndex = selectedTabIndex,
+                    modifier = Modifier,
+                    containerColor = Color.Transparent
+                ) {
+                    tabItems.forEachIndexed { index, item ->
+                        Tab(
+                            selected = index == selectedTabIndex,
+                            onClick = {
+                                if (selectedTabIndex != index) {
+                                    selectedTabIndex = index
+                                }
+                            },
+                            text = {
+                                item.titleResId?.let { resId ->
+                                    Text(text = stringResource(id = resId))
+                                }
+                            }
+                        )
+                    }
+                }
+            }
+        }
+    ) { padding ->
+        val pagerState = rememberPagerState(
+            initialPage = selectedTabIndex
+        ) {
+            tabItems.size
+        }
+
+        LaunchedEffect(selectedTabIndex) {
+            pagerState.animateScrollToPage(selectedTabIndex)
+        }
+
+        LaunchedEffect(pagerState) {
+            snapshotFlow { pagerState.currentPage }
+                .collect { selectedTabIndex = it }
+        }
+
+        HorizontalPager(
+            state = pagerState,
+            modifier = Modifier.fillMaxSize(),
+        ) { index ->
+            FriendsScreen(
+                padding = padding,
+                tabIndex = index,
+                onSessionExpiredLogOutButtonClicked = { onError(BaseError.SessionExpired) },
+                onPhotoClicked = onPhotoClicked,
+                onMessageClicked = onMessageClicked,
+                setCanScrollBackward = { canScrollBackward = it }
+            )
+        }
+    }
+}