INNER CODE UNIT · Dart

index

Dimibe/grouped_list · lib/grouped_list.dart:465

    var index = math.max(int.parse(topItemKey), 0);
    if (index != _topElementIndex) {
      var curr = widget.groupBy(_sortedElements[index]);
      E prev;

      try {
        prev = widget.groupBy(_sortedElements[_topElementIndex]);
      } on RangeError catch (_) {
        prev = widget.groupBy(_sortedElements[0]);
      }

      if (prev != curr) {
        _topElementIndex = index;
        _streamController.add(_topElementIndex);
      }
    }
  }

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