loadMore method

Future<void> loadMore(Future<List<ChatMessage>> loadCallback()?)

Loads more messages using the provided callback.

Returns early if already loading or no more messages. The callback should return a list of messages to add.

Implementation

Future<void> loadMore(Future<List<ChatMessage>> Function()? loadCallback) async {
//    if (_isLoadingMore || !_hasMoreMessages || !paginationConfig.enabled) {
//      return;
//    }

  try {
    _isLoadingMore = true;
    notifyListeners();

    // Simulate network delay if specified
    if (paginationConfig.loadingDelay.inMilliseconds > 0) {
      await Future<void>.delayed(paginationConfig.loadingDelay);
    }

    // Get more messages from the callback or use the backward compatibility one
    final moreMessages = loadCallback != null
        ? await loadCallback()
        : _onLoadMoreMessagesCallback != null
            ? await _onLoadMoreMessagesCallback!(_messages.isNotEmpty ? _messages.last : null)
            : <ChatMessage>[];

    if (moreMessages.isEmpty) {
      _hasMoreMessages = false;
    } else {
      // Add the messages
      addMessages(moreMessages);
      _currentPage++;
    }
  } catch (e) {
    _hasMoreMessages = true; // Allow retry on error
    rethrow;
  } finally {
    _isLoadingMore = false;
    notifyListeners();
  }
}