This gist is part of https://github.com/widiarifki/android-playground/tree/master/compose

(ShoppingListScreen) ShoppingListScreen.kt

@Composable
fun ShoppingListScreen(
    isLoading: Boolean,
    shoppingItems: List<ShoppingItem>,
    onAddItem: (ShoppingItem) -> Unit,
    onToggleTickItem: (ShoppingItem) -> Unit,
    onDeleteItem: (ShoppingItem) -> Unit
) {

    // Content Container
    Column(modifier = Modifier.fillMaxHeight()) {
        val expandHeight = Modifier.weight(1f)

        when {
            isLoading -> {
                LoadingIndicator(expandHeight)
            }
            !isLoading && shoppingItems.isEmpty() -> {
                EmptyState(expandHeight)
            }
            !isLoading && shoppingItems.isNotEmpty() -> {
                ShoppingList(
                    shoppingItems = shoppingItems,
                    onToggleTickItem = onToggleTickItem,
                    onDeleteItem = onDeleteItem,
                    modifier = expandHeight
                )
            }
        }

        if (!isLoading) FormInputContainer(onAddItem)
    }
}