@override
void initState() {
  super.initState();

  _typewriterKeyboardController = TypewriterKeyboardController();
  _typewriterKeyboardController.textStream.listen(_onTextReceived);
}

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
      leading: BackButton(),
    ),
    bottomSheet: TypewriterKeyboard(
      typewriterKeyboardController: _typewriterKeyboardController,
    ),
  );
}

void _onTextReceived(String text) {
   final textValue = text.toLowerCase();

   switch (textValue) {
      //Update EditText
    }
}