Borodar.ReorderableList.ReorderableListControl.HandleDropInsertion C# (CSharp) Метод

        private void HandleDropInsertion(Rect position, IReorderableListAdaptor adaptor)
        {
            var target = adaptor as IReorderableListDropTarget;
            if (target == null || !_allowDropInsertion)
                return;

            if (target.CanDropInsert(_insertionIndex)) {
                ++s_DropTargetNestedCounter;

                switch (Event.current.type) {
                    case EventType.DragUpdated:
                        DragAndDrop.visualMode = DragAndDropVisualMode.Move;
                        DragAndDrop.activeControlID = _controlID;
                        target.ProcessDropInsertion(_insertionIndex);
                        Event.current.Use();
                        break;

                    case EventType.DragPerform:
                        target.ProcessDropInsertion(_insertionIndex);

                        DragAndDrop.AcceptDrag();
                        DragAndDrop.activeControlID = 0;
                        Event.current.Use();
                        break;

                    default:
                        target.ProcessDropInsertion(_insertionIndex);
                        break;
                }

                if (DragAndDrop.activeControlID == _controlID && Event.current.type == EventType.Repaint)
                    DrawDropIndicator(new Rect(position.x, _insertionPosition - 2, position.width, 3));
            }
        }