Neonoviiwolf

final _scaffoldMessengerKey = getIt<GlobalKey<ScaffoldMessengerState>>();

void showSnackBar({required String text}) {
  _scaffoldMessengerKey.currentState
    ?..clearSnackBars()
    ..showSnackBar(
      SnackBar(
        content: Text(text),
        action: SnackBarAction(
          label: 'Закрыть',
          textColor: Colors.yellow,
          onPressed: () {},
        ),
      ),
    );
}

class _AppState extends State<App> {
  final rootScaffoldMessengerKey = getIt<GlobalKey<ScaffoldMessengerState>>();

  @override
  Widget build(BuildContext context) {
    return MaterialApp.router(
      scaffoldMessengerKey: rootScaffoldMessengerKey,
      builder: (context, child) {
       return child;
      },
    );
  }
}

(parsedJson['items'] as List)
        .map((dynamic e) => e as Map<String, dynamic>)
        .toList();

class RuNumberTextInputFormatter extends TextInputFormatter {
  @override
  TextEditingValue formatEditUpdate(
    TextEditingValue oldValue,
    TextEditingValue newValue,
  ) {
    final int newTextLength = newValue.text.length;
    int selectionIndex = newValue.selection.end;
    int usedSubstringIndex = 0;
    final StringBuffer newText = StringBuffer();

    if (newTextLength >= 1) {
      newText.write('(');
      if (newValue.selection.end >= 1) selectionIndex++;
    }

    if (newTextLength >= 4) {
      newText.write('${newValue.text.substring(0, usedSubstringIndex = 3)}) ');
      if (newValue.selection.end >= 3) selectionIndex += 2;
    }

    if (newTextLength >= 7) {
      newText.write('${newValue.text.substring(3, usedSubstringIndex = 6)}-');
      if (newValue.selection.end >= 6) selectionIndex++;
    }

    if (newTextLength >= 9) {
      newText.write('${newValue.text.substring(6, usedSubstringIndex = 8)}-');
      if (newValue.selection.end >= 8) selectionIndex++;
    }

    if (newTextLength >= usedSubstringIndex) {
      newText.write(newValue.text.substring(usedSubstringIndex));
    }

    if (newTextLength > 10) {
      return TextEditingValue(
        text: oldValue.text,
        selection: TextSelection.collapsed(offset: oldValue.text.length),
      );
    }

    return TextEditingValue(
      text: newText.toString(),
      selection: TextSelection.collapsed(offset: selectionIndex),
    );
  }
}