ScaledWidthTextField

class ScaledWidthTextField (TextField):
    """A TextField which automatically scales down its font size until the width of the
        layer is within the horizontal bound of a reference layer."""
    FONT = CardFonts.RULES

    @cached_property
    def font(self) -> str:
        """str: Font provided, or fallback on global constant."""
        return self.kw_font or CON.font_rules_text

    @cached_property
    def reference_width(self) -> Union[float, int]:
        """Union[float, int]: Width of the reference layer provided."""
        return get_layer_width(self.reference)

    def execute(self):
        super().execute()

        # Scale down the text layer until it doesn't overlap with a reference layer
        if self.reference:
            scale_text_to_width(self.layer, width=self.reference_width)