Init the effect that enlarge the focused menu entry.
        Keyword arguments can contain enlarge_time and enlarge_factor.

def _effectinit_enlarge_font_on_focus(self, name, **kwargs):
        """Init the effect that enlarge the focused menu entry.
        Keyword arguments can contain enlarge_time and enlarge_factor.
        """

        self._effects[name] = kwargs
        if "font" not in kwargs:
            raise TypeError(
                "enlarge_font_on_focus: font parameter is required"
            )
        if "size" not in kwargs:
            raise TypeError(
                "enlarge_font_on_focus: size parameter is required"
            )
        if "enlarge_time" not in kwargs:
            kwargs['enlarge_time'] = 0.5
        if "enlarge_factor" not in kwargs:
            kwargs['enlarge_factor'] = 2.0

        kwargs['raise_font_ps'] = (
            kwargs['enlarge_factor'] / kwargs['enlarge_time']  # pixel-per-sec
        )
        for option in self.options:
            option['font'] = pygame.font.Font(kwargs['font'], kwargs['size'])
            option['font_current_size'] = kwargs['size']
            option['raise_font_factor'] = 1.0