static void RebalanceUntilRoot(FileNodeViewModel pos)
{
while (pos.listParent != null)
{
if (pos == pos.listParent.left)
{
pos = pos.listParent.left = Rebalance(pos);
}
else
{
Debug.Assert(pos == pos.listParent.right);
pos = pos.listParent.right = Rebalance(pos);
}
pos = pos.listParent;
}
FileNodeViewModel newRoot = Rebalance(pos);
if (newRoot != pos && pos.treeFlattener != null)
{
Debug.Assert(newRoot.treeFlattener == null);
newRoot.treeFlattener = pos.treeFlattener;
pos.treeFlattener = null;
newRoot.treeFlattener.root = newRoot;
}
Debug.Assert(newRoot.listParent == null);
newRoot.CheckInvariants();
}
void CheckInvariants()
{
Debug.Assert(left == null || left.listParent == this);
Debug.Assert(right == null || right.listParent == this);
Debug.Assert(height == 1 + Math.Max(Height(left), Height(right)));
Debug.Assert(Math.Abs(this.Balance) <= 1);
Debug.Assert(totalListLength == -1 || totalListLength == (left != null ? left.totalListLength : 0) + (isVisible ? 1 : 0) + (right != null ? right.totalListLength : 0));
if (left != null)
{
left.CheckInvariants();
}
if (right != null)
{
right.CheckInvariants();
}
}
