VitNX_TreeView.ToggleNode Method

public void ToggleNode(VitNX_TreeNode node)
 {
     if (_selectedNodes.Contains(node))
     {
         _selectedNodes.Remove(node);
 
         // If we just removed both the anchor start AND end then reset them
         if (_anchoredNodeStart == node && _anchoredNodeEnd == node)
         {
             if (_selectedNodes.Count > 0)
             {
                 _anchoredNodeStart = _selectedNodes[0];
                 _anchoredNodeEnd = _selectedNodes[0];
             }
             else
             {
                 _anchoredNodeStart = null;
                 _anchoredNodeEnd = null;
             }
         }
 
         // If we just removed the anchor start then update it accordingly
         if (_anchoredNodeStart == node)
         {
             if (_anchoredNodeEnd.VisibleIndex < node.VisibleIndex)
                 _anchoredNodeStart = node.PrevVisibleNode;
             else if (_anchoredNodeEnd.VisibleIndex > node.VisibleIndex)
                 _anchoredNodeStart = node.NextVisibleNode;
             else
                 _anchoredNodeStart = _anchoredNodeEnd;
         }
 
         // If we just removed the anchor end then update it accordingly
         if (_anchoredNodeEnd == node)
         {
             if (_anchoredNodeStart.VisibleIndex < node.VisibleIndex)
                 _anchoredNodeEnd = node.PrevVisibleNode;
             else if (_anchoredNodeStart.VisibleIndex > node.VisibleIndex)
                 _anchoredNodeEnd = node.NextVisibleNode;
             else
                 _anchoredNodeEnd = _anchoredNodeStart;
         }
     }
     else
     {
         _selectedNodes.Add(node);
 
         _anchoredNodeStart = node;
         _anchoredNodeEnd = node;
     }
 
     Invalidate();
 }