customwidgetstatelessclass.dart

class _strikeThrough extends StatelessWidget{

  bool todoToggle;
  String todoText;
  _strikeThrough({this.todoToggle, this.todoText}) : super();

  Widget _strikewidget(){
    if(todoToggle==false){
      return Text(
          todoText,
          style: TextStyle(
            fontSize: 22.0
          ),
      );
    }
    else{
      return Text(
          todoText,
          style: TextStyle(
            fontSize: 22.0,
            decoration: TextDecoration.lineThrough,
            color: Colors.redAccent,
            fontStyle: FontStyle.italic
          ),
        );
    }
  }

  @override
  Widget build(BuildContext context) {
    return _strikewidget();
  }
}