refactor(form): refactor simple example

packages/wyatt_form_bloc/example/lib/sign_up/widgets/sign_up_form.dart

@@ -36,9 +36,10 @@ Color computeColor(Metadata? meta) {
 class _NameInput extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    return InputBuilderMetadata<SimpleCustomFormCubit, Metadata>(
+    return InputBuilderTextController<SimpleCustomFormCubit, String?, Metadata>(
       field: formFieldName,
-      builder: (context, cubit, state, field, inputValid, metadata) {
+      builder:
+          (context, cubit, state, field, inputValid, controller, metadata) {
         final meta = state.form.metadataOf<Metadata>(field).extra;
         final color = computeColor(meta);
         return Row(
@@ -57,6 +58,7 @@ class _NameInput extends StatelessWidget {
             SizedBox(
               width: MediaQuery.of(context).size.width - 45,
               child: TextField(
+                controller: controller,
                 onChanged: (value) =>
                     cubit.dataChanged(field, Name.dirty(value)),
                 keyboardType: TextInputType.name,

packages/wyatt_form_bloc/example/lib/sign_up/widgets/simple_sign_up_form.dart

@@ -0,0 +1,57 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:flutter/material.dart';
+import 'package:form_bloc_example/app/metadata.dart';
+import 'package:form_bloc_example/constants.dart';
+import 'package:form_bloc_example/simple_custom_form_cubit/simple_custom_form_cubit.dart';
+import 'package:wyatt_form_bloc/wyatt_form_bloc.dart';
+
+class _NameInput extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return InputBuilderTextController<SimpleCustomFormCubit, String?, Metadata>(
+      field: formFieldName,
+      builder:
+          (context, cubit, state, field, inputValid, controller, metadata) {
+        return TextField(
+          controller: controller,
+          onChanged: (value) => cubit.dataChanged(field, Name.dirty(value)),
+          keyboardType: TextInputType.name,
+          decoration: InputDecoration(
+            labelText: 'name',
+            helperText: '',
+            errorText: !inputValid ? 'invalid name' : null,
+          ),
+        );
+      },
+    );
+  }
+}
+
+class SimpleSignUpForm extends StatelessWidget {
+  const SimpleSignUpForm({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        _NameInput(),
+        const SizedBox(height: 8),
+      ],
+    );
+  }
+}