mynotes: update/edit existing notes

lib/constants/routes.dart

@@ -2,4 +2,4 @@ const loginRoute = '/login/';
 const registerRoute = '/register/';
 const notesRoute = '/notes/';
 const verifyEmailRoute = '/verify-email/';
-const newNoteRoute = '/notes/new-note/';
+const createOrUpdateNoteRoute = '/notes/new-note/';

lib/main.dart

@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:mynotes/constants/routes.dart';
 import 'package:mynotes/services/auth/auth_service.dart';
 import 'package:mynotes/views/login_view.dart';
-import 'package:mynotes/views/notes/new_note_view.dart';
+import 'package:mynotes/views/notes/create_update_note_view.dart';
 import 'package:mynotes/views/notes/notes_view.dart';
 import 'package:mynotes/views/register_view.dart';
 import 'package:mynotes/views/verify_email_view.dart';
@@ -22,7 +22,7 @@ void main() {
         registerRoute: (context) => const RegisterView(),
         notesRoute: (context) => const NotesView(),
         verifyEmailRoute: (context) => const VerifyEmailView(),
-        newNoteRoute: (context) => const NewNoteView(),
+        createOrUpdateNoteRoute: (context) => const CreateUpdateNoteView(),
       },
     ),
   );

lib/utilities/generics/get_arguments.dart

@@ -0,0 +1,14 @@
+import 'package:flutter/material.dart' show BuildContext, ModalRoute;
+
+extension GetArguments on BuildContext {
+  T? getArgument<T>() {
+    final modalRoute = ModalRoute.of(this);
+    if (modalRoute != null) {
+      final args = modalRoute.settings.arguments;
+      if (args != null && args is T) {
+        return args as T;
+      }
+    }
+    return null;
+  }
+}

lib/views/notes/create_update_note_view.dart

@@ -1,15 +1,16 @@
 import 'package:flutter/material.dart';
 import 'package:mynotes/services/auth/auth_service.dart';
 import 'package:mynotes/services/crud/notes_service.dart';
+import 'package:mynotes/utilities/generics/get_arguments.dart';
 
-class NewNoteView extends StatefulWidget {
-  const NewNoteView({Key? key}) : super(key: key);
+class CreateUpdateNoteView extends StatefulWidget {
+  const CreateUpdateNoteView({Key? key}) : super(key: key);
 
   @override
-  _NewNoteViewState createState() => _NewNoteViewState();
+  _CreateUpdateNoteViewState createState() => _CreateUpdateNoteViewState();
 }
 
-class _NewNoteViewState extends State<NewNoteView> {
+class _CreateUpdateNoteViewState extends State<CreateUpdateNoteView> {
   DatabaseNote? _note;
   late final NotesService _notesService;
   late final TextEditingController _textController;
@@ -38,7 +39,14 @@ class _NewNoteViewState extends State<NewNoteView> {
     _textController.addListener(_textControllerListener);
   }
 
-  Future<DatabaseNote> createNewNote() async {
+  Future<DatabaseNote> createOrGetExistingNote(BuildContext context) async {
+    final widgetNote = context.getArgument<DatabaseNote>();
+
+    if (widgetNote != null) {
+      _note = widgetNote;
+      _textController.text = widgetNote.text;
+      return widgetNote;
+    }
     final existingNote = _note;
     if (existingNote != null) {
       return existingNote;
@@ -46,7 +54,9 @@ class _NewNoteViewState extends State<NewNoteView> {
     final currentUser = AuthService.firebase().currentUser!;
     final email = currentUser.email!;
     final owner = await _notesService.getUser(email: email);
-    return await _notesService.createNote(owner: owner);
+    final newNote = await _notesService.createNote(owner: owner);
+    _note = newNote;
+    return newNote;
   }
 
   void _deleteNoteIfTextIsEmpty() {
@@ -90,11 +100,10 @@ class _NewNoteViewState extends State<NewNoteView> {
         ),
       ),
       body: FutureBuilder(
-        future: createNewNote(),
+        future: createOrGetExistingNote(context),
         builder: (context, snapshot) {
           switch (snapshot.connectionState) {
             case ConnectionState.done:
-              _note = snapshot.data as DatabaseNote;
               _setupTextControllerListener();
               return TextField(
                 controller: _textController,

lib/views/notes/notes_list_view.dart

@@ -1,18 +1,19 @@
-
 import 'package:flutter/material.dart';
 import 'package:mynotes/services/crud/notes_service.dart';
 import 'package:mynotes/utilities/dialogs/delete_dialog.dart';
 
-typedef DeleteNoteCallback = void Function(DatabaseNote note);
+typedef NoteCallback = void Function(DatabaseNote note);
 
 class NotesListView extends StatelessWidget {
   final List<DatabaseNote> notes;
-  final DeleteNoteCallback onDeleteNote;
+  final NoteCallback onDeleteNote;
+  final NoteCallback onTap;
 
   const NotesListView({
     Key? key,
     required this.notes,
     required this.onDeleteNote,
+    required this.onTap,
   }) : super(key: key);
 
   @override
@@ -22,6 +23,9 @@ class NotesListView extends StatelessWidget {
       itemBuilder: (context, index) {
         final note = notes[index];
         return ListTile(
+          onTap: () {
+            onTap(note);
+          },
           title: Text(
             note.text,
             maxLines: 1,
@@ -41,4 +45,4 @@ class NotesListView extends StatelessWidget {
       },
     );
   }
-}
+}

lib/views/notes/notes_view.dart

@@ -32,7 +32,7 @@ class _NotesViewState extends State<NotesView> {
         actions: [
           IconButton(
             onPressed: () {
-              Navigator.of(context).pushNamed(newNoteRoute);
+              Navigator.of(context).pushNamed(createOrUpdateNoteRoute);
             },
             icon: const Icon(Icons.add),
           ),
@@ -79,6 +79,12 @@ class _NotesViewState extends State<NotesView> {
                           onDeleteNote: (note) async {
                             await _notesService.deleteNote(id: note.id);
                           },
+                          onTap: (note) {
+                            Navigator.of(context).pushNamed(
+                              createOrUpdateNoteRoute,
+                              arguments: note,
+                            );
+                          },
                         );
                       } else {
                         return const CircularProgressIndicator();