예제 #1
0
 void PreviousVersion()
 {
     EnsureSaved();
     if (_currentPage >= Book.Pages.Count)
     {
         return;
     }
     if (_currentIterator == null)
     {
         _currentIterator = Book.Pages[_currentPage].GetIterator();
         _currentIterator.MoveToEnd();
     }
     if (_currentIterator.MovePrevious())
     {
         UpdateTextBox();
         UpdateViewLabels();
     }
 }