Made scrolling faster (#961)

apps/android/app/src/main/java/chat/simplex/app/views/chat/ChatView.kt

@@ -252,22 +252,21 @@ fun ChatLayout(
         sheetShape = RoundedCornerShape(topStart = 18.dp, topEnd = 18.dp)
       ) {
         val floatingButton: MutableState<@Composable () -> Unit> = remember { mutableStateOf({}) }
+        val setFloatingButton = { button: @Composable () -> Unit ->
+          floatingButton.value = button
+        }
+
         Scaffold(
           topBar = { ChatInfoToolbar(chat, back, info, startCall, addMembers, onSearchValueChanged) },
           bottomBar = composeView,
           modifier = Modifier.navigationBarsWithImePadding(),
-          floatingActionButton = floatingButton.value,
+          floatingActionButton = { floatingButton.value() },
         ) { contentPadding ->
-          CompositionLocalProvider(
-            // Makes horizontal and vertical scrolling to coexist nicely.
-            // With default touchSlop when you scroll LazyColumn, you can unintentionally open reply view
-            LocalViewConfiguration provides LocalViewConfiguration.current.bigTouchSlop()
-          ) {
           BoxWithConstraints(Modifier.padding(contentPadding)) {
             ChatItemsList(
               user, chat, unreadCount, composeState, chatItems, searchValue,
               useLinkPreviews, openDirectChat, loadPrevMessages, deleteMessage,
-                receiveFile, joinGroup, acceptCall, markRead, floatingButton
+              receiveFile, joinGroup, acceptCall, markRead, setFloatingButton
             )
           }
         }
@@ -275,7 +274,6 @@ fun ChatLayout(
     }
   }
 }
-}
 
 @Composable
 fun ChatInfoToolbar(
@@ -412,7 +410,7 @@ fun BoxWithConstraintsScope.ChatItemsList(
   joinGroup: (Long) -> Unit,
   acceptCall: (Contact) -> Unit,
   markRead: (CC.ItemRange, unreadCountAfter: Int?) -> Unit,
-  floatingButton: MutableState<@Composable () -> Unit>
+  setFloatingButton: (@Composable () -> Unit) -> Unit,
 ) {
   val listState = rememberLazyListState()
   val scope = rememberCoroutineScope()
@@ -451,6 +449,11 @@ fun BoxWithConstraintsScope.ChatItemsList(
   val reversedChatItems by remember { derivedStateOf { chatItems.reversed() } }
   LazyColumn(state = listState, reverseLayout = true) {
     itemsIndexed(reversedChatItems) { i, cItem ->
+      CompositionLocalProvider(
+        // Makes horizontal and vertical scrolling to coexist nicely.
+        // With default touchSlop when you scroll LazyColumn, you can unintentionally open reply view
+        LocalViewConfiguration provides LocalViewConfiguration.current.bigTouchSlop()
+      ) {
         val dismissState = rememberDismissState(initialValue = DismissValue.Default) { false }
         val directions = setOf(DismissDirection.EndToStart)
         val swipeableModifier = SwipeToDismissModifier(
@@ -528,7 +531,8 @@ fun BoxWithConstraintsScope.ChatItemsList(
         }
       }
     }
-  FloatingButtons(chatItems, unreadCount, chat.chatStats.minUnreadItemId, searchValue, markRead, floatingButton, listState)
+  }
+  FloatingButtons(chatItems, unreadCount, chat.chatStats.minUnreadItemId, searchValue, markRead, setFloatingButton, listState)
 }
 
 @Composable
@@ -538,7 +542,7 @@ fun BoxWithConstraintsScope.FloatingButtons(
   minUnreadItemId: Long,
   searchValue: State<String>,
   markRead: (CC.ItemRange, unreadCountAfter: Int?) -> Unit,
-  floatingButton: MutableState<@Composable () -> Unit>,
+  setFloatingButton: (@Composable () -> Unit) -> Unit,
   listState: LazyListState
 ) {
   val scope = rememberCoroutineScope()
@@ -577,7 +581,8 @@ fun BoxWithConstraintsScope.FloatingButtons(
   LaunchedEffect(bottomUnreadCount, firstItemIsVisible) {
     val showButtonWithCounter = bottomUnreadCount > 0 && !firstItemIsVisible && searchValue.value.isEmpty()
     val showButtonWithArrow = !showButtonWithCounter && !firstItemIsVisible
-    floatingButton.value = bottomEndFloatingButton(
+    setFloatingButton(
+      bottomEndFloatingButton(
         bottomUnreadCount,
         showButtonWithCounter,
         showButtonWithArrow,
@@ -587,7 +592,7 @@ fun BoxWithConstraintsScope.FloatingButtons(
         onClickCounter = {
           scope.launch { listState.animateScrollToItem(kotlin.math.max(0, bottomUnreadCount - 1), firstVisibleOffset) }
         }
-    )
+      ))
   }
   // Don't show top FAB if is in search
   if (searchValue.value.isNotEmpty()) return
@@ -735,7 +740,7 @@ private fun bottomEndFloatingButton(
   }
 }
 
-private fun ViewConfiguration.bigTouchSlop(slop: Float = 80f) = object: ViewConfiguration {
+private fun ViewConfiguration.bigTouchSlop(slop: Float = 50f) = object: ViewConfiguration {
   override val longPressTimeoutMillis
     get() =
       this@bigTouchSlop.longPressTimeoutMillis