def _update_indicators(self, context):
        """ :type context: dict """
        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)
:type context: dict