2x screen CustomerDisplayPresentation

CustomerDisplayPresentation.kt

class CustomerDisplayPresentation(
    context: Context,
    display: Display,
    private var lifecycleOwner: LifecycleOwner?,
    private var customerDisplayViewModel: CustomerDisplayViewModel?
) : Presentation(context, display) {

    private val adapter = OrderItemPresentationAdapter(context)
    private lateinit var binding: PresentationCustomerDisplayBinding
    private var cartItems: List<OrderItemModel>

    init {
        setCancelable(false)
        cartItems = emptyList()
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        requestWindowFeature(Window.FEATURE_NO_TITLE)

        binding = DataBindingUtil.inflate(LayoutInflater.from(context), R.layout.presentation_customer_display, null, false)
        setContentView(binding.root)
        //cart layout
        binding.orderSummaryOrderedItems.layoutManager = LinearLayoutManager(context)
        binding.orderSummaryOrderedItems.adapter = adapter

        //confirm print layout
        binding.confirmPrintReceiptActionCancel.setOnClickListener {
            onClick(false)
        }
        binding.confirmPrintReceiptAction.setOnClickListener {
            onClick(true)
        }

        ifLet(customerDisplayViewModel, lifecycleOwner) { customerDisplayViewModel, lifecycleOwner ->
            customerDisplayViewModel.cartItemsLiveData.observe(lifecycleOwner) {
                cartItems = it ?: emptyList()
                adapter.setData(cartItems)
                refreshUI()
            }
            customerDisplayViewModel.stateLiveData.observe(lifecycleOwner) {
                binding.viewFlipper.displayedChild = it.flipperViewIndex
            }
        }
        refreshUI()
    }


    private fun refreshUI() {
        if (::binding.isInitialized) {
            binding.orderSummaryOrderedItems.isVisible = cartItems.isNotEmpty()
            binding.emptyCartText.isVisible = cartItems.isEmpty()
            binding.emptyCartImage.isVisible = cartItems.isEmpty()
            if (cartItems.size > 1) {
                //scroll to last items
                binding.orderSummaryOrderedItems.scrollToPosition(cartItems.size - 1)
            }
        }
    }

    private fun onClick(shouldPrint: Boolean) {
        customerDisplayViewModel?.confirmPrintReceiptListener?.onConfirmPrint(shouldPrint)
    }

    fun clear() {
        lifecycleOwner = null
        customerDisplayViewModel = null
    }
}