[FilmEditScreen] separated add and edit blocs

lib/l10n/intl_en.arb

@@ -151,8 +151,11 @@
         }
     },
     "close": "Close",
+    "addFilmTitle": "Add film",
+    "editFilmTitle": "Edit film",
     "filmFormula": "Formula",
     "filmFormulaExponential": "T=t^Rf",
     "filmFormulaExponentialRf": "Rf",
+    "filmFormulaExponentialRfPlaceholder": "1.3",
     "name": "Name"
 }

lib/screens/film_edit/bloc_film_edit.dart

@@ -4,10 +4,13 @@ import 'package:lightmeter/screens/film_edit/state_film_edit.dart';
 import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
 
 class FilmEditBloc extends Bloc<FilmEditEvent, FilmEditState> {
+  static const _defaultFilm = FilmExponential(name: '', iso: 100, exponent: 1.3);
   final FilmExponential _originalFilm;
   FilmExponential _newFilm;
 
-  FilmEditBloc(FilmExponential film)
+  factory FilmEditBloc(FilmExponential? film) => film != null ? FilmEditBloc._(film) : FilmEditBloc._(_defaultFilm);
+
+  FilmEditBloc._(FilmExponential film)
       : _originalFilm = film,
         _newFilm = film,
         super(
@@ -16,6 +19,7 @@ class FilmEditBloc extends Bloc<FilmEditEvent, FilmEditState> {
             isoValue: IsoValue.values.firstWhere((element) => element.value == film.iso),
             exponent: film.exponent,
             canSave: false,
+            isEdit: film != _defaultFilm,
           ),
         ) {
     on<FilmEditEvent>(
@@ -42,6 +46,7 @@ class FilmEditBloc extends Bloc<FilmEditEvent, FilmEditState> {
         isoValue: state.isoValue,
         exponent: state.exponent,
         canSave: _canSave(event.name, state.exponent),
+        isEdit: state.isEdit,
       ),
     );
   }
@@ -54,6 +59,7 @@ class FilmEditBloc extends Bloc<FilmEditEvent, FilmEditState> {
         isoValue: event.iso,
         exponent: state.exponent,
         canSave: _canSave(state.name, state.exponent),
+        isEdit: state.isEdit,
       ),
     );
   }
@@ -68,6 +74,7 @@ class FilmEditBloc extends Bloc<FilmEditEvent, FilmEditState> {
         isoValue: state.isoValue,
         exponent: event.exponent,
         canSave: _canSave(state.name, event.exponent),
+        isEdit: state.isEdit,
       ),
     );
   }

lib/screens/film_edit/flow_film_edit.dart

@@ -5,9 +5,9 @@ import 'package:lightmeter/screens/film_edit/screen_film_edit.dart';
 import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
 
 class FilmEditFlow extends StatelessWidget {
-  final FilmExponential film;
+  final FilmExponential? film;
 
-  const FilmEditFlow(this.film, {super.key});
+  const FilmEditFlow({this.film, super.key});
 
   @override
   Widget build(BuildContext context) {

lib/screens/film_edit/screen_film_edit.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:lightmeter/generated/l10n.dart';
 import 'package:lightmeter/res/dimens.dart';
@@ -24,8 +23,8 @@ class _FilmEditScreenState extends State<FilmEditScreen> {
   Widget build(BuildContext context) {
     return SliverScreen(
       title: BlocBuilder<FilmEditBloc, FilmEditState>(
-        buildWhen: (previous, current) => previous.name != current.name,
-        builder: (_, state) => Text(state.name),
+        buildWhen: (previous, current) => false,
+        builder: (context, state) => Text(state.isEdit ? S.of(context).editFilmTitle : S.of(context).addFilmTitle),
       ),
       appBarActions: [
         BlocBuilder<FilmEditBloc, FilmEditState>(
@@ -97,6 +96,8 @@ class _NameFieldBuilder extends StatelessWidget {
         buildWhen: (previous, current) => previous.name != current.name,
         builder: (context, state) => LightmeterTextField(
           initialValue: state.name,
+          maxLength: 48,
+          hintText: S.of(context).name,
           onChanged: (value) {
             context.read<FilmEditBloc>().add(FilmEditNameChangedEvent(value));
           },

lib/screens/film_edit/state_film_edit.dart

@@ -5,11 +5,13 @@ class FilmEditState {
   final IsoValue isoValue;
   final double? exponent;
   final bool canSave;
+  final bool isEdit;
 
   const FilmEditState({
     required this.name,
     required this.isoValue,
     required this.exponent,
     required this.canSave,
+    required this.isEdit,
   });
 }

lib/screens/shared/text_field/widget_text_field.dart

@@ -6,17 +6,21 @@ class LightmeterTextField extends TextFormField {
     super.focusNode,
     super.initialValue,
     super.inputFormatters,
+    super.maxLength,
     super.onChanged,
     super.style,
     super.textAlign,
     Widget? leading,
+    String? hintText,
   }) : super(
           autovalidateMode: AutovalidateMode.onUserInteraction,
           maxLines: 1,
           decoration: InputDecoration(
+            counter: const SizedBox(),
             contentPadding: EdgeInsets.zero,
             errorStyle: const TextStyle(fontSize: 0),
             icon: leading,
+            hintText: hintText,
           ),
           validator: (value) {
             if (value == null || value.isEmpty) {