Snackbars In Compose

ConverterScreen.kt

@Composable
fun ConverterScreen(
    navController: NavController,
    viewModel: ConverterViewModel
) {

    val scaffoldState = rememberScaffoldState()
    val viewState by viewModel.viewState.collectAsState()
    val viewEffects by viewModel.viewEffects.collectAsState(initial = null)

    Scaffold(
        scaffoldState = scaffoldState,
        content = {

            LaunchedEffect(true) {

                viewModel.onEvent(ConverterViewEvents.OnReady)

                when (viewEffects) {
                    is ConverterViewEffects.ConvertCurrenciesFailed -> {
                        Timber.e("CONVERT CURRENCIES FAILED")
                        val error = (viewEffects as ConverterViewEffects.ConvertCurrenciesFailed).error
                        scaffoldState.snackbarHostState.showSnackbar(
                            message = when(error){
                                ConvertCurrenciesError.NetworkError -> "Please check your network connection and try again."
                                ConvertCurrenciesError.UnknownError -> "An Unexpected Error Occurred."
                            },
                            duration = SnackbarDuration.Short
                        )
                    }
                }

            }

            when (viewState) {
                is ConverterViewState.Initial -> Unit
                is ConverterViewState.Loading -> {
                    Column(
                        modifier = Modifier.fillMaxSize(),
                        horizontalAlignment = Alignment.CenterHorizontally,
                        verticalArrangement = Arrangement.Center
                    ) {
                        CircularProgressIndicator()
                    }
                }
                is ConverterViewState.Content -> {
                    val contentState = viewState as ConverterViewState.Content
                }
                is ConverterViewState.Error -> Unit
            }
        },
        snackbarHost = { hostState ->
            SnackbarHost(hostState = hostState) { data ->
                Snackbar(snackbarData = data)
            }
        }
    )
}