code: def _update_indicators(self, context):
          
          model = self._model
          self._vertical_indicator.set_height(model.height + 1)
          self._vertical_indicator.set_width(1)
          self._horizontal_indicator.set_width(model.width + 1)
          self._horizontal_indicator.set_height(1)
  
          show_indicators = context['show_indicators']
  
          self._vertical_indicator.set_visible(model.x_index is not None and show_indicators)
          self._horizontal_indicator.set_visible(model.y_index is not None and show_indicators)
  
          if model.x_index is not None and show_indicators:
              self._vertical_indicator.set_x(model.x_index)
  
          if model.y_index is not None and show_indicators:
              self._horizontal_indicator.set_y(model.y_index)
docs: :type context: dict