ScaledTextFieldLeft

class ScaledTextFieldLeft (TextField):
    """A TextField which automatically scales down its font size until the left bound
        no longer overlaps with the `reference` layer's right bound."""

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

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