private void OnCalculatorClick(object sender, System.Windows.RoutedEventArgs e)
 {
     if (e.OriginalSource is Button button)
     {
         if (button.DataContext is Operation operation)
         {
             if (operation.Type == OperationType.Equal)
             {
                 operationPerformer.Calculate(values, operationTypes);
             }
             else
             {
                 operationTypes.Add(operation.Type);
             }
         }
         else
         {
             values.Add(button.Content.ToString());
         }
     }
 }