resolveFontSize static method

CSSLengthValue resolveFontSize(String fontSize, RenderStyle renderStyle, String propertyName)

Implementation

static CSSLengthValue resolveFontSize(String fontSize, RenderStyle renderStyle, String propertyName) {
  switch (fontSize) {
    case 'xx-small':
      return CSSLengthValue(3 / 5 * 16, CSSLengthType.PX);
    case 'x-small':
      return CSSLengthValue(3 / 4 * 16, CSSLengthType.PX);
    case 'small':
      return CSSLengthValue(8 / 9 * 16, CSSLengthType.PX);
    case 'medium':
      return CSSLengthValue(16, CSSLengthType.PX);
    case 'large':
      return CSSLengthValue(6 / 5 * 16, CSSLengthType.PX);
    case 'x-large':
      return CSSLengthValue(3 / 2 * 16, CSSLengthType.PX);
    case 'xx-large':
      return CSSLengthValue(2 / 1 * 16, CSSLengthType.PX);
    case 'xxx-large':
      return CSSLengthValue(3 / 1 * 16, CSSLengthType.PX);
    case 'smaller':
      return CSSLengthValue(5 / 6, CSSLengthType.EM, renderStyle, propertyName);
    case 'larger':
      return CSSLengthValue(6 / 5, CSSLengthType.EM, renderStyle, propertyName);
    default:
      // Parse lengths/percentages/functions (e.g., calc()).
      final CSSLengthValue parsed = CSSLength.parseLength(fontSize, renderStyle, propertyName);
      // If parsing failed, treat as invalid (ignore declaration).
      if (identical(parsed, CSSLengthValue.unknown)) {
        // Keep previous value unchanged (ignore invalid declaration).
        return renderStyle.fontSize;
      }
      // Preserve calc() results (including negative) for computed style queries.
      // Some integration tests expect negative computed values from calc() for font-size
      // (e.g., calc(30% - 40px) relative to a 40px parent resolves to -28px).
      // Return the parsed value directly; any layout-time handling can clamp if needed.
      return parsed;
  }
}