refresh method

Future<void> refresh({ int? page, })

Refreshes the data. If page is provided, it re-fetches only that specific page and replaces its items. If page is null, it clears everything and starts over from page 1.

Implementation

Future<void> refresh({int? page}) async {
  if (page != null) {
    if (!_pageItemCounts.containsKey(page)) return;

    _isLoading = true;
    notifyListeners();

    try {
      final result = await onFetch(page);

      // Calculate the starting index of the page
      int startIndex = 0;
      for (int i = 1; i < page; i++) {
        startIndex += _pageItemCounts[i] ?? 0;
      }

      // Replace the items for this page
      final oldItemCount = _pageItemCounts[page] ?? 0;
      _items.replaceRange(startIndex, startIndex + oldItemCount, result.items);

      // Update the item count for this page
      _pageItemCounts[page] = result.items.length;
    } catch (e) {
      _error = e;
    } finally {
      _isLoading = false;
      notifyListeners();
    }
    return;
  }

  _items = [];
  _pageItemCounts.clear();
  _currentPage = 1;
  _hasMore = true;
  _error = null;
  await loadMore();
}