UnityEditor.SplitView.AddChild C# (CSharp) Method

        public override void AddChild(View child, int idx)
        {
            base.AddChild(child, idx);
            this.ChildrenMinMaxChanged();
            this.splitState = null;
        }

        /// clean up this view & propagate down
        public void Cleanup()
        {
            // if I'm a one-view splitview, I can propagate my child up and kill myself

            SplitView sp = parent as SplitView;

            if (children.Length == 1 && sp != null)
            {
                View c = children[0];
                c.position = position;
                if (parent != null)
                {
                    parent.AddChild(c, parent.IndexOfChild(this));
                    parent.RemoveChild(this);
                    if (sp)
                    {
                        sp.Cleanup();
                    }
                    c.position = position;
                    if (!Unsupported.IsDestroyScriptableObject(this))
                    {
                        DestroyImmediate(this);
                    }
                    return;
                }
                else if (c is SplitView)
                {
                    RemoveChild(c);
                    window.rootView = c;
                    c.position      = new Rect(0, 0, c.window.position.width, window.position.height);
                    c.Reflow();
                    if (!Unsupported.IsDestroyScriptableObject(this))
                    {
                        DestroyImmediate(this);
                    }
                    return;
                }
            }

            if (sp)
            {
                sp.Cleanup();
                // the parent might have moved US up and gotten rid of itself
                sp = parent as SplitView;
                if (sp)
                {
                    // If the parent has the same orientation as us, we can move our views up and kill ourselves
                    if (sp.vertical == vertical)
                    {
                        int idx = new List <View>(parent.children).IndexOf(this);
                        foreach (View child in children)
                        {
                            sp.AddChild(child, idx++);
                            child.position = new Rect(position.x + child.position.x, position.y + child.position.y, child.position.width, child.position.height);
                        }
                    }
                }
            }
            if (children.Length == 0)
            {
                if (parent == null && window != null)
                {
                    // if we're root in the window, we'll remove ourselves
                    window.Close();
                }
                else
                {
                    ICleanuppable ic = parent as ICleanuppable;
                    if (parent is SplitView)
                    {
                        ((SplitView)parent).RemoveChildNice(this);
                        if (!Unsupported.IsDestroyScriptableObject(this))
                        {
                            DestroyImmediate(this, true);
                        }
                    }
                    else
                    {
                        // This is we're root in the main window.
                        // We want to stay, but tell the parent (MainWindow) to Cleanup, so he can reduce us to zero-size
                        /*                  parent.RemoveChild (this);*/
                    }
                    ic.Cleanup();
                }
                return;
            }
            else
            {
                splitState = null;
                Reflow();
            }
        }