refactoring

lib/pages/todo_create_page.dart

@@ -0,0 +1,62 @@
+import 'package:flutter/material.dart';
+
+import '../models/todo.dart';
+import '../services/dbhelper.dart';
+
+class CreateTodoPage extends StatefulWidget {
+  const CreateTodoPage({super.key});
+  static const routeName = '/create';
+
+  @override
+  State<CreateTodoPage> createState() => _CreateTodoPageState();
+}
+
+class _CreateTodoPageState extends State<CreateTodoPage> {
+  String _title = '';
+  String _description = '';
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      floatingActionButton: _title.isNotEmpty
+          ? FloatingActionButton(
+              onPressed: _onSubmitted,
+              child: const Icon(Icons.save),
+            )
+          : null,
+      appBar: AppBar(),
+      body: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 20),
+        child: Column(
+          children: [
+            TextField(
+              decoration: const InputDecoration(label: Text('Title')),
+              textInputAction: TextInputAction.next,
+              onTapOutside: (event) => FocusScope.of(context).unfocus(),
+              onChanged: (value) {
+                if (value.isEmpty || (value.isNotEmpty && _title.isEmpty)) {
+                  setState(() {
+                    _title = value;
+                  });
+                } else {
+                  _title = value;
+                }
+              },
+            ),
+            TextField(
+              minLines: 3,
+              maxLines: 5,
+              decoration: const InputDecoration(label: Text('Description')),
+              onChanged: (value) => _description = value,
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  void _onSubmitted() {
+    DbHelper.addTodo(Todo(title: _title, description: _description));
+    Navigator.of(context).pop();
+  }
+}