Bloom.Edit.ThumbNailList._listView_MouseUp C# (CSharp) Method

        private void _listView_MouseUp(object sender, MouseEventArgs e)
        {
            //            if (_mouseDownLocation == default(Point))
            //            {
            //                _currentTarget = null;
            //                _currentDraggingItem = null;
            //                return;
            //            }
            //
            //		    var mouseDownLocation = _mouseDownLocation;
            //		    _mouseDownLocation = default(Point);

            Capture = false;
            Debug.WriteLine("MouseUp");
            _intentionallyChangingSelection = false;

            if (Control.MouseButtons == MouseButtons.Left)
                return;

            Cursor = Cursors.Default;

            bool notPointingAtOriginalLocation= _listView.GetItemAt(e.X, e.Y) != _currentDraggingItem;

            //		    var horizontalMovement = Math.Abs(mouseDownLocation.X - e.X);
            //            var verticalMovement = Math.Abs(mouseDownLocation.Y - e.Y);
            //		    bool sufficientDistance = horizontalMovement > _thumbnailImageList.ImageSize.Width
            //                || verticalMovement > _thumbnailImageList.ImageSize.Height;

            if (notPointingAtOriginalLocation &&  RelocatePageEvent != null && _currentDraggingItem != null)
            {
                Debug.WriteLine("Re-ordering");
                if (_currentTarget == null ||
                        _currentTarget == _currentDraggingItem) //should never happen, but to be safe
                {
                    _currentTarget = null;
                    _currentDraggingItem = null;
                    return;
                }

                var relocatePageInfo = new RelocatePageInfo((IPage) _currentDraggingItem.Tag, _currentTarget.Index - _numberofEmptyListItemsAtStart);
                RelocatePageEvent.Raise(relocatePageInfo);
                if (relocatePageInfo.Cancel)
                    return;

                _listView.BeginUpdate();
                _listView.Items.Remove(_currentDraggingItem);
                _listView.Items.Insert(_currentTarget.Index, _currentDraggingItem);
                _listView.EndUpdate();
                _currentTarget = null;
                _currentDraggingItem = null;

                UpdateThumbnailCaptions();
                _listView.Invalidate();
            }
            else
            {
                _currentTarget = null;
                _currentDraggingItem = null;
            }
        }