ReaderScreen: Great performance improvement by reducing recompositions count. (v1.0.1)

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/ReaderScreen.kt

@@ -92,16 +92,6 @@ fun ReaderScreenRoot() {
             state.value.listState.canScrollBackward && state.value.listState.canScrollForward
         }
     }
-    val firstVisibleItemIndex = remember {
-        derivedStateOf {
-            state.value.listState.firstVisibleItemIndex
-        }
-    }
-    val firstVisibleItemOffset = remember {
-        derivedStateOf {
-            state.value.listState.firstVisibleItemScrollOffset
-        }
-    }
 
     LaunchedEffect(Unit) {
         viewModel.init(
@@ -119,21 +109,16 @@ fun ReaderScreenRoot() {
                 ).show()
             }
         )
+        viewModel.onUpdateProgress(
+            onLibraryEvent = libraryViewModel::onEvent,
+            onHistoryEvent = historyViewModel::onEvent
+        )
     }
     LaunchedEffect(canScroll) {
         if (!canScroll && !state.value.showMenu && !state.value.loading) {
             viewModel.onEvent(ReaderEvent.OnShowHideMenu(context = context))
         }
     }
-    LaunchedEffect(firstVisibleItemIndex.value, firstVisibleItemOffset.value) {
-        viewModel.onUpdateProgress(
-            firstVisibleItemIndex = firstVisibleItemIndex.value,
-            firstVisibleItemOffset = firstVisibleItemOffset.value,
-            navigator = navigator,
-            onLibraryEvent = libraryViewModel::onEvent,
-            onHistoryEvent = historyViewModel::onEvent
-        )
-    }
 
     DisposableEffect(Unit) {
         onDispose {

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/app_bar/ReaderBottomBar.kt

@@ -21,7 +21,6 @@ import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
-import ua.acclorite.book_story.presentation.data.LocalNavigator
 import ua.acclorite.book_story.presentation.data.removeDigits
 import ua.acclorite.book_story.presentation.data.removeTrailingZero
 import ua.acclorite.book_story.presentation.screens.history.data.HistoryEvent
@@ -45,7 +44,6 @@ fun ReaderBottomBar(
     onLibraryUpdateEvent: (LibraryEvent.OnUpdateBook) -> Unit,
     onHistoryUpdateEvent: (HistoryEvent.OnUpdateBook) -> Unit
 ) {
-    val navigator = LocalNavigator.current
     val progress by remember(state.value.book.progress) {
         derivedStateOf {
             (state.value.book.progress * 100)
@@ -86,7 +84,6 @@ fun ReaderBottomBar(
                     onEvent(
                         ReaderEvent.OnChangeProgress(
                             progress = it,
-                            navigator = navigator,
                             firstVisibleItemIndex = state.value.listState.firstVisibleItemIndex,
                             firstVisibleItemOffset = 0,
                             refreshList = { book ->

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/text/ReaderTextParagraph.kt

@@ -217,5 +217,4 @@ fun LazyItemScope.ReaderTextParagraph(
             )
         )
     }
-
 }

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/data/ReaderEvent.kt

@@ -70,7 +70,6 @@ sealed class ReaderEvent {
 
     data class OnChangeProgress(
         val progress: Float,
-        val navigator: Navigator,
         val firstVisibleItemIndex: Int,
         val firstVisibleItemOffset: Int,
         val refreshList: (Book) -> Unit

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/data/ReaderViewModel.kt

@@ -1270,14 +1270,11 @@ class ReaderViewModel @Inject constructor(
 
     @OptIn(FlowPreview::class)
     suspend fun onUpdateProgress(
-        firstVisibleItemIndex: Int,
-        firstVisibleItemOffset: Int,
-        navigator: Navigator,
         onLibraryEvent: (LibraryEvent) -> Unit,
         onHistoryEvent: (HistoryEvent) -> Unit
     ) {
         snapshotFlow {
-            firstVisibleItemIndex to firstVisibleItemOffset
+            _state.value.listState.firstVisibleItemIndex to _state.value.listState.firstVisibleItemScrollOffset
         }
             .debounce(300)
             .collectLatest { items ->
@@ -1307,7 +1304,6 @@ class ReaderViewModel @Inject constructor(
                     onEvent(
                         ReaderEvent.OnChangeProgress(
                             progress = progress,
-                            navigator = navigator,
                             firstVisibleItemIndex = items.first,
                             firstVisibleItemOffset = items.second,
                             refreshList = { book ->