public void Tracking()
{
if (Parent.Count < 2)
{
return;
}
// remove itself and on the same linked list.
var interactSet = Parent.Where(i =>
{
// ignore itself.
if (i == _pivot)
{
return(false);
}
// ignore member.
if (_pivot.HeadOf(i))
{
return(false);
}
if (_pivot.DoAll(ele => ele.HasDescendents(i)))
{
return(false);
}
// ignore ancestor
if (_pivot.IsDescendents(i))
{
return(false);
}
return(true);
}).ToList();
//prioritize for middle->bottom->above
Watch(interactSet);
// current is stateless, we revert the change of previous state.
if (_currentState.Stateless())
{
_previousState.InteractShape?.DoAll(i => i.Redo());
_previousParentShape?.UpdateMiddleSpace();
_previousParentShape = null;
var prev = _pivot.Prev;
_pivot.RemoveHead();
_pivot.DoAll(i => i.Alone());
prev?.DoInverseAll(i => i.VirtualHeight = i.ReCalculateVirtualHeight());
_currentParentShape = null;
}
if (_currentState.InteractDirection != State.ShapeState.Middle)
{
_previousParentShape?.UpdateMiddleSpace();
}
// interact with control block
if (!_currentState.Stateless() && _currentState.InteractDirection == State.ShapeState.Middle)
{
if (_currentState.InteractShape != _previousParentShape)
{
_previousParentShape?.UpdateMiddleSpace();
}
_currentParentShape = _currentState.InteractShape;
interactSet = _currentParentShape.ChildrenNode.ToList();
_currentParentShape.Expand(_pivot.Height + 8.8);
_previousParentShape = _currentParentShape;
Watch(interactSet);
}
ProcessInLinear();
}