Adds a list state saver to the messages screen

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/feeds/RememberForeverStates.kt

@@ -41,6 +41,8 @@ object ScrollStateKeys {
     const val VIDEO_SCREEN = "VideoFeed"
     const val HOME_FOLLOWS = "HomeFollowsFeed"
     const val HOME_REPLIES = "HomeFollowsRepliesFeed"
+    const val MESSAGES_KNOWN = "MessagesKnown"
+    const val MESSAGES_NEW = "MessagesNew"
     const val PROFILE_GALLERY = "ProfileGalleryFeed"
 
     const val DRAFTS = "DraftsFeed"

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/rooms/feed/ChatroomListFeedView.kt

@@ -24,8 +24,8 @@ import androidx.compose.animation.core.tween
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.foundation.lazy.itemsIndexed
-import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
@@ -40,7 +40,7 @@ import com.vitorpamplona.amethyst.ui.feeds.FeedError
 import com.vitorpamplona.amethyst.ui.feeds.FeedState
 import com.vitorpamplona.amethyst.ui.feeds.LoadingFeed
 import com.vitorpamplona.amethyst.ui.feeds.RefresheableBox
-import com.vitorpamplona.amethyst.ui.feeds.WatchScrollToTop
+import com.vitorpamplona.amethyst.ui.feeds.SaveableFeedContentState
 import com.vitorpamplona.amethyst.ui.navigation.INav
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.rooms.ChatroomHeaderCompose
@@ -50,18 +50,22 @@ import com.vitorpamplona.amethyst.ui.theme.FeedPadding
 @Composable
 fun ChatroomListFeedView(
     feedContentState: FeedContentState,
+    scrollStateKey: String,
     accountViewModel: AccountViewModel,
     nav: INav,
     markAsRead: MutableState<Boolean>,
 ) {
     RefresheableBox(feedContentState, true) {
-        CrossFadeState(feedContentState, accountViewModel, nav, markAsRead)
+        SaveableFeedContentState(feedContentState, scrollStateKey) { listState ->
+            CrossFadeState(feedContentState, listState, accountViewModel, nav, markAsRead)
+        }
     }
 }
 
 @Composable
 private fun CrossFadeState(
     feedContentState: FeedContentState,
+    listState: LazyListState,
     accountViewModel: AccountViewModel,
     nav: INav,
     markAsRead: MutableState<Boolean>,
@@ -81,7 +85,7 @@ private fun CrossFadeState(
                 FeedError(state.errorMessage) { feedContentState.invalidateData() }
             }
             is FeedState.Loaded -> {
-                FeedLoaded(state, feedContentState, accountViewModel, nav, markAsRead)
+                FeedLoaded(state, listState, accountViewModel, nav, markAsRead)
             }
             FeedState.Loading -> {
                 LoadingFeed()
@@ -93,23 +97,19 @@ private fun CrossFadeState(
 @Composable
 private fun FeedLoaded(
     loaded: FeedState.Loaded,
-    feedContentState: FeedContentState,
+    listState: LazyListState,
     accountViewModel: AccountViewModel,
     nav: INav,
     markAsRead: MutableState<Boolean>,
 ) {
     val items by loaded.feed.collectAsStateWithLifecycle()
 
-    val listState = rememberLazyListState()
-
     LaunchedEffect(key1 = markAsRead.value) {
         if (markAsRead.value) {
             accountViewModel.markAllAsRead(items.list, accountViewModel) { markAsRead.value = false }
         }
     }
 
-    WatchScrollToTop(feedContentState, listState)
-
     LazyColumn(
         contentPadding = FeedPadding,
         state = listState,

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/rooms/feed/ChatroomListTabs.kt

@@ -60,6 +60,7 @@ import kotlinx.coroutines.launch
 @Immutable
 class MessagesTabItem(
     val resource: Int,
+    val scrollStateKey: String,
     val feedContentState: FeedContentState,
     val markAsRead: MutableState<Boolean>,
 )
@@ -128,6 +129,7 @@ fun MessagesPager(
     ) { page ->
         ChatroomListFeedView(
             feedContentState = tabs[page].feedContentState,
+            scrollStateKey = tabs[page].scrollStateKey,
             accountViewModel = accountViewModel,
             nav = nav,
             markAsRead = tabs[page].markAsRead,

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/rooms/singlepane/MessagesSinglePane.kt

@@ -29,6 +29,7 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.ui.feeds.FeedContentState
+import com.vitorpamplona.amethyst.ui.feeds.ScrollStateKeys
 import com.vitorpamplona.amethyst.ui.feeds.WatchLifecycleAndUpdateModel
 import com.vitorpamplona.amethyst.ui.layouts.DisappearingScaffold
 import com.vitorpamplona.amethyst.ui.navigation.AppBottomBar
@@ -63,8 +64,8 @@ fun MessagesSinglePane(
         remember(knownFeedContentState, markKnownAsRead) {
             derivedStateOf {
                 listOf(
-                    MessagesTabItem(R.string.known, knownFeedContentState, markKnownAsRead),
-                    MessagesTabItem(R.string.new_requests, newFeedContentState, markNewAsRead),
+                    MessagesTabItem(R.string.known, ScrollStateKeys.MESSAGES_KNOWN, knownFeedContentState, markKnownAsRead),
+                    MessagesTabItem(R.string.new_requests, ScrollStateKeys.MESSAGES_NEW, newFeedContentState, markNewAsRead),
                 )
             }
         }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/rooms/twopane/ChatroomListPane.kt

@@ -31,6 +31,7 @@ import androidx.compose.runtime.remember
 import androidx.compose.ui.unit.dp
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.ui.feeds.FeedContentState
+import com.vitorpamplona.amethyst.ui.feeds.ScrollStateKeys
 import com.vitorpamplona.amethyst.ui.feeds.WatchLifecycleAndUpdateModel
 import com.vitorpamplona.amethyst.ui.navigation.INav
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
@@ -60,8 +61,8 @@ fun ChatroomList(
         remember(knownFeedContentState, markKnownAsRead) {
             derivedStateOf {
                 listOf(
-                    MessagesTabItem(R.string.known, knownFeedContentState, markKnownAsRead),
-                    MessagesTabItem(R.string.new_requests, newFeedContentState, markNewAsRead),
+                    MessagesTabItem(R.string.known, ScrollStateKeys.MESSAGES_KNOWN, knownFeedContentState, markKnownAsRead),
+                    MessagesTabItem(R.string.new_requests, ScrollStateKeys.MESSAGES_NEW, newFeedContentState, markNewAsRead),
                 )
             }
         }