addItem method

Implementation

addItem(BuildContext context) {
  if (contextList.isEmpty) {
    contextList = [];
  }
  if (contextList.any((element) => element == context) == false) {
    contextList.insert(contextList.length, context);
  } else {
    contextList
        .removeAt(contextList.indexWhere((element) => element == context));
    contextList.insert(contextList.length, context);
  }
}