refresh method

Implementation

@override
Future<void> refresh() async {
  _state.updateState(isRefreshing: true, pageNum: 1);
  _state.clearError();
  notifyListeners();
  try {
    final response = await loadData();
    _state.clear();
    _state.addData(response.data);
    _state.updateState(
      pageNum: _state.pageNum + 1,
      hasMore: _hasMoreData(response),
      initialRefresh: false,
      isRefreshing: false,
    );
    refreshController.refreshCompleted();
  } catch (e) {
    _state.updateState(
      hasMore: false,
      isRefreshing: false,
      error: e.toString(),
    );
    refreshController.refreshFailed();
  } finally {
    notifyListeners();
  }
}