withFontLineHeight function

TextStyle withFontLineHeight(TextStyle style, { required bool fit, required double clearance, })

style with the line height of its own font family, as createTextTheme sets it for its text styles (docs/design/ADR_font_line_height.md in telosnex).

A style that sets a different font family than the theme must set its own height. Otherwise it inherits the height of the theme font from DefaultTextStyle, sized for another font.

fit is MonetThemeData.compactLineHeights: true for lineHeightForFontFamily at clearance, false for the font's own box.

Implementation

TextStyle withFontLineHeight(
  TextStyle style, {
  required bool fit,
  required double clearance,
}) {
  final height = fit
      ? lineHeightForFontFamily(style.fontFamily, clearance: clearance)
      : naturalLineHeightForFontFamily(style.fontFamily);
  if (height == null) return style;
  return style.copyWith(
    height: height,
    leadingDistribution: TextLeadingDistribution.even,
  );
}