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...
apply from: './flavors.gradle'
...
android {
    buildTypes {
        productFlavors {
            project.flavors.each { flavor, config ->
                "$flavor" {
                    dimension 'scope'
                    if (flavor != 'full') {

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extension NoteStateX on NoteState {
  /// Checks if a note in this state can be edited.
  bool get canEdit => this < NoteState.deleted;

  /// Returns true if this state is preceding to the other one.
  bool operator <(NoteState other) => (this?.index ?? 0) < (other?.index ?? 0);

  /// Message describes the state transition.
  String get message {
    switch (this) {      

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// The editor of a [Note], also shows every detail about a single note.
class NoteEditor extends StatefulWidget {
  /// Create a [NoteEditor],
  /// provides an existed [note] in edit mode, or `null` to create a new one.
  const NoteEditor({Key key, this.note}) : super(key: key);

  final Note note;

  @override
  State<StatefulWidget> createState() => _NoteEditorState(note);

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void main() => runApp(NotesApp());

/// Root widget of the application.
class NotesApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) => StreamProvider.value(
    initialData: CurrentUser.initial,
    value: FirebaseAuth.instance.onAuthStateChanged.map((user) => CurrentUser.create(user)),
    child: Consumer<CurrentUser>(
      builder: (context, user, _) => MaterialApp(

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/// Save the note before the editor is dismissed
Future<dynamic> _onPop(String uid) => _isDirty
  ? _note.saveToFireStore(uid)
  : Future.value();

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extension NoteStore on Note {
  /// Save this note to FireStore.
  Future<dynamic> saveToFireStore(String uid) async {
    final col = notesCollection(uid);
    return id == null
      ? col.add(toJson())
      : col.document(id).updateData(toJson());
  }
    ...
}

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class _HomeScreenState extends State<HomeScreen> with CommandHandler {
  Widget _fab(BuildContext context) => FloatingActionButton(
    child: const Icon(Icons.add),
    onPressed: () async {
      final command = await Navigator.pushNamed(context, '/note');
      processNoteCommand(_scaffoldKey.currentState, command);
    },
  );
  ...
}

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mixin CommandHandler<T extends StatefulWidget> on State<T> {
  /// Processes the given [command].
  Future<void> processNoteCommand(ScaffoldState scaffoldState, NoteCommand command) async {
    if (command == null) {
      return;
    }
    await command.execute();
    final msg = command.message;
    if (mounted && msg?.isNotEmpty == true) {
      scaffoldState?.showSnackBar(SnackBar(

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@override
Widget build(BuildContext context) {
  final uid = Provider.of<CurrentUser>(context).data.uid;
  return ChangeNotifierProvider.value(
    value: _note,
    child: Consumer<Note>(
      builder: (_, __, ___) => Hero(
        tag: 'NoteItem${_note.id}',
        child: DefaultTextStyle(
          style: ...

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// in the note list
@override
Widget build(BuildContext context) => Hero(
  tag: 'NoteItem${note.id}',
  child: DefaultTextStyle(
    style: kNoteTextLight,
    child: Container(            
      ...
    ),
  ),