UnityEditor.SplitView.MakeRoomForRect C# (CSharp) Method

        private void MakeRoomForRect(Rect r)
        {
            Rect[] sources = new Rect[base.children.Length];
            for (int i = 0; i < sources.Length; i++)
            {
                sources[i] = base.children[i].position;
            }
            this.CalcRoomForRect(sources, r);
            for (int j = 0; j < sources.Length; j++)
            {
                base.children[j].position = sources[j];
            }
        }

        public bool PerformDrop(EditorWindow dropWindow, DropInfo dropInfo, Vector2 screenPos)
        {
            var       extraInfo     = dropInfo.userData as ExtraDropInfo;
            var       rootWindow    = extraInfo.rootWindow;
            var       edge          = extraInfo.edge;
            var       dropIndex     = extraInfo.index;
            var       dropRect      = dropInfo.rect;
            var       beginning     = (edge & ViewEdge.Before) != 0;
            var       wantsVertical = (edge & ViewEdge.FitsVertical) != 0;
            SplitView parentForDrop = null;

            if (vertical == wantsVertical || children.Length < 2)
            { // Current view can accommodate desired drop
                if (!beginning)
                {
                    if (rootWindow)
                    {
                        dropIndex = children.Length;
                    }
                    else
                    {
                        ++dropIndex;
                    }
                }
                parentForDrop = this;
            }
            else if (rootWindow)
            { // Docking to a window: need to insert a parent
                var newParent = ScriptableObject.CreateInstance <SplitView>();
                newParent.position = position;
                if (window.rootView == this)
                {
                    window.rootView = newParent;
                }
                else // Main window has MainView as its root
                {
                    parent.AddChild(newParent, parent.IndexOfChild(this));
                }
                newParent.AddChild(this);
                position = new Rect(Vector2.zero, position.size);

                dropIndex     = beginning ? 0 : 1;
                parentForDrop = newParent;
            }
            else
            { // Docking in a view: need to insert a child
                var newChild = ScriptableObject.CreateInstance <SplitView>();

                newChild.AddChild(children[dropIndex]);
                AddChild(newChild, dropIndex);
                newChild.position             = newChild.children[0].position;
                newChild.children[0].position = new Rect(Vector2.zero, newChild.position.size);

                dropIndex     = beginning ? 0 : 1;
                parentForDrop = newChild;
            }
            dropRect.position = dropRect.position - screenPosition.position;
            var newDockArea = ScriptableObject.CreateInstance <DockArea>();

            parentForDrop.vertical = wantsVertical;
            parentForDrop.MakeRoomForRect(dropRect);
            parentForDrop.AddChild(newDockArea, dropIndex);
            newDockArea.position = dropRect;
            DockArea.s_OriginalDragSource.RemoveTab(dropWindow, killIfEmpty: true, sendEvents: false);
            dropWindow.m_Parent = newDockArea;
            newDockArea.AddTab(dropWindow, sendPaneEvents: false);
            Reflow();
            RecalcMinMaxAndReflowAll(this);
            newDockArea.MakeVistaDWMHappyDance();
            return(true);
        }