TextStyle constructor Null safety

const TextStyle(
  1. {bool inherit = true,
  2. Color? color,
  3. Color? backgroundColor,
  4. double? fontSize,
  5. FontWeight? fontWeight,
  6. FontStyle? fontStyle,
  7. double? letterSpacing,
  8. double? wordSpacing,
  9. TextBaseline? textBaseline,
  10. double? height,
  11. TextLeadingDistribution? leadingDistribution,
  12. Locale? locale,
  13. Paint? foreground,
  14. Paint? background,
  15. List<Shadow>? shadows,
  16. List<FontFeature>? fontFeatures,
  17. TextDecoration? decoration,
  18. Color? decorationColor,
  19. TextDecorationStyle? decorationStyle,
  20. double? decorationThickness,
  21. String? debugLabel,
  22. String? fontFamily,
  23. List<String>? fontFamilyFallback,
  24. String? package,
  25. TextOverflow? overflow}
)

Creates a text style.

The package argument must be non-null if the font family is defined in a package. It is combined with the fontFamily argument to set the fontFamily property.

Implementation

const TextStyle({
  this.inherit = true,
  this.color,
  this.backgroundColor,
  this.fontSize,
  this.fontWeight,
  this.fontStyle,
  this.letterSpacing,
  this.wordSpacing,
  this.textBaseline,
  this.height,
  this.leadingDistribution,
  this.locale,
  this.foreground,
  this.background,
  this.shadows,
  this.fontFeatures,
  this.decoration,
  this.decorationColor,
  this.decorationStyle,
  this.decorationThickness,
  this.debugLabel,
  String? fontFamily,
  List<String>? fontFamilyFallback,
  String? package,
  this.overflow,
}) : fontFamily = package == null ? fontFamily : 'packages/$package/$fontFamily',
     _fontFamilyFallback = fontFamilyFallback,
     _package = package,
     assert(inherit != null),
     assert(color == null || foreground == null, _kColorForegroundWarning),
     assert(backgroundColor == null || background == null, _kColorBackgroundWarning);