scrolling to top when select directory icon again

features/directory/src/main/kotlin/app/dapk/st/directory/DirectoryListingScreen.kt

@@ -53,16 +53,22 @@ import kotlin.math.roundToInt
 @Composable
 fun DirectoryScreen(directoryViewModel: DirectoryViewModel) {
     val state = directoryViewModel.state
-    directoryViewModel.ObserveEvents()
-    LifecycleEffect(
-        onStart = { directoryViewModel.start() },
-        onStop = { directoryViewModel.stop() }
+
+    val listState: LazyListState = rememberLazyListState(
+        initialFirstVisibleItemIndex = 0,
     )
 
     val toolbarHeight = 72.dp
     val toolbarHeightPx = with(LocalDensity.current) { toolbarHeight.roundToPx().toFloat() }
     val toolbarOffsetHeightPx = remember { mutableStateOf(0f) }
 
+    directoryViewModel.ObserveEvents(listState, toolbarOffsetHeightPx)
+
+    LifecycleEffect(
+        onStart = { directoryViewModel.start() },
+        onStop = { directoryViewModel.stop() }
+    )
+
     val nestedScrollConnection = remember {
         object : NestedScrollConnection {
             override fun onPreScroll(available: Offset, source: NestedScrollSource): Offset {
@@ -80,7 +86,7 @@ fun DirectoryScreen(directoryViewModel: DirectoryViewModel) {
     ) {
         when (state) {
             is Content -> {
-                Content(state)
+                Content(listState, state)
             }
             EmptyLoading -> CenteredLoading()
             is Error -> {
@@ -99,7 +105,7 @@ fun DirectoryScreen(directoryViewModel: DirectoryViewModel) {
 }
 
 @Composable
-private fun DirectoryViewModel.ObserveEvents() {
+private fun DirectoryViewModel.ObserveEvents(listState: LazyListState, toolbarPosition: MutableState<Float>) {
     val context = LocalContext.current
     StartObserving {
         this@ObserveEvents.events.launch {
@@ -107,21 +113,22 @@ private fun DirectoryViewModel.ObserveEvents() {
                 is OpenDownloadUrl -> {
                     context.startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(it.url)))
                 }
+                DirectoryEvent.ScrollToTop -> {
+                    toolbarPosition.value = 0f
+                    listState.scrollToItem(0)
+                }
             }
         }
     }
 }
 
 @Composable
-private fun Content(state: Content) {
+private fun Content(listState: LazyListState, state: Content) {
     val context = LocalContext.current
     val navigateToRoom = { roomId: RoomId ->
         context.startActivity(MessengerActivity.newInstance(context, roomId))
     }
     val clock = Clock.systemUTC()
-    val listState: LazyListState = rememberLazyListState(
-        initialFirstVisibleItemIndex = 0,
-    )
     val scope = rememberCoroutineScope()
 
     LaunchedEffect(key1 = state.overviewState) {

features/directory/src/main/kotlin/app/dapk/st/directory/DirectoryState.kt

@@ -10,5 +10,6 @@ sealed interface DirectoryScreenState {
 
 sealed interface DirectoryEvent {
     data class OpenDownloadUrl(val url: String) : DirectoryEvent
+    object ScrollToTop : DirectoryEvent
 }
 

features/directory/src/main/kotlin/app/dapk/st/directory/DirectoryViewModel.kt

@@ -36,5 +36,9 @@ class DirectoryViewModel(
     fun stop() {
         syncJob?.cancel()
     }
+
+    fun scrollToTopOfMessages() {
+        _events.tryEmit(DirectoryEvent.ScrollToTop)
+    }
 }
 

features/home/src/main/kotlin/app/dapk/st/home/HomeScreen.kt

@@ -25,6 +25,7 @@ fun HomeScreen(homeViewModel: HomeViewModel) {
                 homeViewModel.start()
             }
 
+
             when (val state = homeViewModel.state) {
                 Loading -> CenteredLoading()
                 is SignedIn -> {
@@ -66,7 +67,12 @@ private fun BottomBar(state: SignedIn, homeViewModel: HomeViewModel) {
                     Directory -> BottomNavigationItem(
                         icon = { Icon(page.icon, contentDescription = null) },
                         selected = state.page == page,
-                        onClick = { homeViewModel.changePage(page) },
+                        onClick = {
+                            when {
+                                state.page == page -> homeViewModel.scrollToTopOfMessages()
+                                else -> homeViewModel.changePage(page)
+                            }
+                        },
                     )
                     Profile -> BottomNavigationItem(
                         icon = {

features/home/src/main/kotlin/app/dapk/st/home/HomeViewModel.kt

@@ -55,6 +55,10 @@ class HomeViewModel(
         }
     }
 
+    fun scrollToTopOfMessages() {
+        directoryViewModel.scrollToTopOfMessages()
+    }
+
     fun changePage(page: Page) {
         state = when (val current = state) {
             Loading -> current