MainApp.kt

@Composable
fun MainAppContent(
    modifier: Modifier = Modifier,
    state: ContactUiState
) {
    Box(modifier = modifier
        .fillMaxSize()
    ) {
        // the loader indicator
        AnimatedVisibility(visible = state.loading) {
            LinearProgressIndicator(
                Modifier.fillMaxWidth()
            )
        }
        // the contact list
        ContactsList(
            modifier = Modifier.fillMaxSize(),
            contacts = state.contacts
        )
    }
}