parentController property

@override set parentController (ScrollController parentController)

used to chaining parent scroll controller

Implementation

@override
set parentController(ScrollController parentController) {
  if (_parentController == parentController) return;

  final isNotEmpty = positions.isNotEmpty;
  if (isNotEmpty && _parentController != null) {
    for (final p in _parentController!.positions)
      if (positions.contains(p)) _parentController!.detach(p);
  }

  _parentController = parentController;

  if (isNotEmpty && _parentController != null)
    for (final p in positions) _parentController!.attach(p);
}