sliverDirection property
Implementation
@override
Axis get sliverDirection => _sliverDirection ?? Axis.vertical;
      
      set
      sliverDirection
      (Axis? value) 
      
    
    
    
Implementation
set sliverDirection(Axis? value) {
  if (_sliverDirection == value) return;
  _sliverDirection = value;
  renderBoxModel?.markNeedsLayout();
}