fetchPrev property

Future<List<T>> Function(int index, int crossAxisCount)? fetchPrev
final

Function to fetch the previous set of items when scrolling backward.

index is the last index of the data to be fetched next. For example, if data 20-39 is currently displayed, the previous data will be fetched starting from 19.

crossAxisCount is the number of children along the horizontal axis in a GridView. For a ListView, it is 1.

If this method returns an empty List, it is determined that data fetching has ended, and no further data will be fetched.

Implementation

final Future<List<T>> Function(int index, int crossAxisCount)? fetchPrev;