Saves the position of the Notification feed

app/src/main/java/com/vitorpamplona/amethyst/ui/navigation/AppNavigation.kt

@@ -53,13 +53,9 @@ fun AppNavigation(
     GlobalFeedFilter.account = account
     val searchFeedViewModel: NostrGlobalFeedViewModel = viewModel()
 
-    val restartNotificationList = NotificationFeedFilter.isDifferentAccount(account)
-
     NotificationFeedFilter.account = account
     val notifFeedViewModel: NotificationViewModel = viewModel()
 
-    if (restartNotificationList) notifFeedViewModel.clear()
-
     NavHost(navController, startDestination = Route.Home.route) {
         Route.Search.let { route ->
             composable(route.route, route.arguments, content = {
@@ -99,8 +95,25 @@ fun AppNavigation(
             })
         }
 
+        Route.Notification.let { route ->
+            composable(route.route, route.arguments, content = {
+                val scrollToTop = it.arguments?.getBoolean("scrollToTop") ?: false
+
+                NotificationScreen(
+                    notifFeedViewModel = notifFeedViewModel,
+                    accountViewModel = accountViewModel,
+                    navController = navController,
+                    scrollToTop = scrollToTop
+                )
+
+                // Avoids running scroll to top when back button is pressed
+                if (scrollToTop) {
+                    it.arguments?.remove("scrollToTop")
+                }
+            })
+        }
+
         composable(Route.Message.route, content = { ChatroomListScreen(accountViewModel, navController) })
-        composable(Route.Notification.route, content = { NotificationScreen(notifFeedViewModel, accountViewModel, navController) })
         composable(Route.BlockedUsers.route, content = { HiddenUsersScreen(accountViewModel, navController) })
         composable(Route.Bookmarks.route, content = { BookmarkListScreen(accountViewModel, navController) })
 

app/src/main/java/com/vitorpamplona/amethyst/ui/navigation/Routes.kt

@@ -37,8 +37,9 @@ sealed class Route(
     )
 
     object Notification : Route(
-        route = "Notification",
+        route = "Notification?scrollToTop={scrollToTop}",
         icon = R.drawable.ic_notifications,
+        arguments = listOf(navArgument("scrollToTop") { type = NavType.BoolType; defaultValue = false }),
         hasNewItems = { accountViewModel, cache -> notificationHasNewItems(accountViewModel, cache) }
     )
 

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/CardFeedView.kt

@@ -13,6 +13,7 @@ import androidx.compose.material.pullrefresh.PullRefreshIndicator
 import androidx.compose.material.pullrefresh.pullRefresh
 import androidx.compose.material.pullrefresh.rememberPullRefreshState
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -33,7 +34,14 @@ import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 
 @OptIn(ExperimentalMaterialApi::class)
 @Composable
-fun CardFeedView(viewModel: CardFeedViewModel, accountViewModel: AccountViewModel, navController: NavController, routeForLastRead: String) {
+fun CardFeedView(
+    viewModel: CardFeedViewModel,
+    accountViewModel: AccountViewModel,
+    navController: NavController,
+    routeForLastRead: String,
+    scrollStateKey: String? = null,
+    scrollToTop: Boolean = false
+) {
     val feedState by viewModel.feedContent.collectAsState()
 
     var refreshing by remember { mutableStateOf(false) }
@@ -57,10 +65,12 @@ fun CardFeedView(viewModel: CardFeedViewModel, accountViewModel: AccountViewMode
                     is CardFeedState.Loaded -> {
                         refreshing = false
                         FeedLoaded(
-                            state,
+                            state = state,
-                            accountViewModel,
+                            accountViewModel = accountViewModel,
-                            navController,
+                            navController = navController,
-                            routeForLastRead
+                            routeForLastRead = routeForLastRead,
+                            scrollStateKey = scrollStateKey,
+                            scrollToTop = scrollToTop
                         )
                     }
                     CardFeedState.Loading -> {
@@ -79,9 +89,21 @@ private fun FeedLoaded(
     state: CardFeedState.Loaded,
     accountViewModel: AccountViewModel,
     navController: NavController,
-    routeForLastRead: String
+    routeForLastRead: String,
+    scrollStateKey: String?,
+    scrollToTop: Boolean = false
 ) {
-    val listState = rememberLazyListState()
+    val listState = if (scrollStateKey != null) {
+        rememberForeverLazyListState(scrollStateKey)
+    } else {
+        rememberLazyListState()
+    }
+
+    if (scrollToTop) {
+        LaunchedEffect(Unit) {
+            listState.scrollToItem(index = 0)
+        }
+    }
 
     LazyColumn(
         contentPadding = PaddingValues(

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/CardFeedViewModel.kt

@@ -3,6 +3,7 @@ package com.vitorpamplona.amethyst.ui.screen
 import android.util.Log
 import androidx.compose.runtime.mutableStateOf
 import androidx.lifecycle.ViewModel
+import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.LocalCacheState
 import com.vitorpamplona.amethyst.model.Note
@@ -32,6 +33,7 @@ open class CardFeedViewModel(val dataSource: FeedFilter<Note>) : ViewModel() {
     private val _feedContent = MutableStateFlow<CardFeedState>(CardFeedState.Loading)
     val feedContent = _feedContent.asStateFlow()
 
+    private var lastAccount: Account? = null
     private var lastNotes: List<Note>? = null
 
     private fun refresh() {
@@ -45,18 +47,21 @@ open class CardFeedViewModel(val dataSource: FeedFilter<Note>) : ViewModel() {
     private fun refreshSuspended() {
         val notes = dataSource.loadTop()
 
-        val lastNotesCopy = lastNotes
+        val thisAccount = (dataSource as? NotificationFeedFilter)?.account
+        val lastNotesCopy = if (thisAccount == lastAccount) lastNotes else null
 
         val oldNotesState = feedContent.value
         if (lastNotesCopy != null && oldNotesState is CardFeedState.Loaded) {
             val newCards = convertToCard(notes.minus(lastNotesCopy))
             if (newCards.isNotEmpty()) {
                 lastNotes = notes
+                lastAccount = (dataSource as? NotificationFeedFilter)?.account
                 updateFeed((oldNotesState.feed.value + newCards).distinctBy { it.id() }.sortedBy { it.createdAt() }.reversed())
             }
         } else {
             val cards = convertToCard(notes)
             lastNotes = notes
+            lastAccount = (dataSource as? NotificationFeedFilter)?.account
             updateFeed(cards)
         }
     }

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/LazyListState.kt

@@ -11,6 +11,7 @@ private data class ScrollState(val index: Int, val scrollOffset: Int)
 
 object ScrollStateKeys {
     const val GLOBAL_SCREEN = "Global"
+    const val NOTIFICATION_SCREEN = "Notifications"
     val HOME_FOLLOWS = Route.Home.base + "Follows"
     val HOME_REPLIES = Route.Home.base + "FollowsReplies"
 }

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/NotificationScreen.kt

@@ -18,9 +18,15 @@ import com.vitorpamplona.amethyst.ui.dal.NotificationFeedFilter
 import com.vitorpamplona.amethyst.ui.navigation.Route
 import com.vitorpamplona.amethyst.ui.screen.CardFeedView
 import com.vitorpamplona.amethyst.ui.screen.NotificationViewModel
+import com.vitorpamplona.amethyst.ui.screen.ScrollStateKeys
 
 @Composable
-fun NotificationScreen(notifFeedViewModel: NotificationViewModel, accountViewModel: AccountViewModel, navController: NavController) {
+fun NotificationScreen(
+    notifFeedViewModel: NotificationViewModel,
+    accountViewModel: AccountViewModel,
+    navController: NavController,
+    scrollToTop: Boolean = false
+) {
     val accountState by accountViewModel.accountLiveData.observeAsState()
     val account = accountState?.account ?: return
 
@@ -48,7 +54,14 @@ fun NotificationScreen(notifFeedViewModel: NotificationViewModel, accountViewMod
         Column(
             modifier = Modifier.padding(vertical = 0.dp)
         ) {
-            CardFeedView(notifFeedViewModel, accountViewModel = accountViewModel, navController, Route.Notification.route)
+            CardFeedView(
+                viewModel = notifFeedViewModel,
+                accountViewModel = accountViewModel,
+                navController = navController,
+                routeForLastRead = Route.Notification.base,
+                scrollStateKey = ScrollStateKeys.NOTIFICATION_SCREEN,
+                scrollToTop = scrollToTop
+            )
         }
     }
 }

app/src/main/res/drawable/alby.xml

@@ -0,0 +1,39 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="250dp"
+    android:height="250dp"
+    android:viewportWidth="250"
+    android:viewportHeight="250">
+  <path
+      android:pathData="M48.12,70.63m18.75,0a18.75,18.75 0,1 0,-37.5 0a18.75,18.75 0,1 0,37.5 0"
+      android:fillColor="#000000"/>
+  <path
+      android:pathData="M45,67.82L80,102.82"
+      android:strokeWidth="9.37484"
+      android:fillColor="#00000000"
+      android:strokeColor="#000000"/>
+  <path
+      android:pathData="M201.25,70.63m-18.75,0a18.75,18.75 0,1 1,37.5 0a18.75,18.75 0,1 1,-37.5 0"
+      android:fillColor="#000000"/>
+  <path
+      android:pathData="M204.68,67.82L169.68,102.82"
+      android:strokeWidth="9.37484"
+      android:fillColor="#00000000"
+      android:strokeColor="#000000"/>
+  <path
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+      android:fillColor="#FFDF6F"
+      android:fillType="evenOdd"/>
+  <path
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+      android:fillColor="#000000"/>
+  <path
+      android:pathData="M71.48,170.76C63.34,167.44 58.52,158.79 61.34,150.47C70.03,124.82 95.38,106.25 125.31,106.25C155.24,106.25 180.59,124.82 189.29,150.47C192.1,158.79 187.28,167.44 179.14,170.76C162.53,177.52 144.36,181.25 125.31,181.25C106.26,181.25 88.09,177.52 71.48,170.76Z"
+      android:fillColor="#000000"
+      android:fillType="evenOdd"/>
+  <path
+      android:pathData="M131.25,146.25a15.62,12.5 0,1 0,31.25 0a15.62,12.5 0,1 0,-31.25 0z"
+      android:fillColor="#ffffff"/>
+  <path
+      android:pathData="M86.52,146.26a15.62,12.5 0,1 0,31.25 0a15.62,12.5 0,1 0,-31.25 0z"
+      android:fillColor="#ffffff"/>
+</vector>