BottomNavWithFAB.kt

@Composable
fun BottomBarWithFabDem() {
    val navController = rememberNavController()
    Scaffold(
        bottomBar = {
            BottomAppBar(
                modifier = Modifier
                    .height(65.dp)
                    .clip(RoundedCornerShape(15.dp, 15.dp, 0.dp, 0.dp)),
                cutoutShape = CircleShape,
                //backgroundColor = Color.White,
                elevation = 22.dp
            ) {
                BottomNav(navController = navController)
            }
        },
        floatingActionButtonPosition = FabPosition.Center,
        isFloatingActionButtonDocked = true,
        floatingActionButton = {
            FloatingActionButton(
                shape = CircleShape,
                onClick = {
                    Screen.Camera.route?.let {
                        navController.navigate(it) {
                            popUpTo(navController.graph.findStartDestination().id) {
                                saveState = true
                            }
                            launchSingleTop = true
                            restoreState = true
                        }
                    }
                    Screen.Camera.route?.let { navController.navigate(it) }
                },
                contentColor = Color.White
            ) {
                Icon(imageVector = Icons.Filled.CameraAlt, contentDescription = "Add icon")
            }
        }
    ) {
        MainScreenNavigation(navController)
    }
}