Bloom.Edit.EditingModel.OnBookSelectionChanged C# (CSharp) Method

        private void OnBookSelectionChanged(object sender, EventArgs e)
        {
            //prevent trying to save this page in whatever comes next
            var wasNull = _domForCurrentPage == null;
            _domForCurrentPage = null;
            _currentlyDisplayedBook = null;
            _templatePagesDict = null;
            if (Visible)
            {
                _view.ClearOutDisplay();
                if (!wasNull)
                    _view.UpdatePageList(false);
            }
        }