14XUd3PP

1class FormFragment : Fragment() {
2
3    private val section by lazy { arguments!!.getParcelable<Section>(SECTION) }
4    private val fieldInputs = mutableListOf<FieldInput>()
5
6    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
7        val view = inflater.inflate(R.layout.form_section_fragment, container, false)
8        return view
9    }
10
11    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
12        super.onViewCreated(view, savedInstanceState)
13        renderFields(view)
14    }
15
16    // This is the method which does the magic
17    private fun renderFields(view: View) {
18        val formContainer = view.findViewById<LinearLayout>(R.id.formContainer)
19
20        //We iterate through each field and decide which component it corresponds to.
21        //All of these components created by ourselves must follow the same interface, which is FieldInput<T>
22        section.fields.forEach {
23            val fieldInput: FieldInput = when(it.type) {
24                FieldType.TEXT -> { TextInput(requireContext()) }
25                FieldType.DATE -> { DateInput(requireContext()) }
26                else -> {
27                    throw IllegalStateException("unknown type")
28                }
29            }
30
31            //we must set a key to each field so we send it back to the api as a map of the key and the value inserted
32            fieldInput.apply {
33                key = it.key
34                setLabel(it.label)
35            }
36
37            //Then we add this field to the list of the fields, so we can validate all of them and get their values
38            fieldInputs.add(fieldInput)
39            
40            //Our view only as a linear layout to hold the fields and place them one on each line
41            formContainer.addView(fieldInput as View)
42        }
43    }
44
45    companion object {
46        const val SECTION = "section"
47
48        fun newInstance(section: Section): FormFragment {
49            val fragment = FormFragment()
50            val bundle = Bundle().apply {
51                putParcelable(SECTION, section)
52            }
53            fragment.arguments = bundle
54            return fragment
55        }
56    }
57}