FontFeature.stylisticSet constructor Null safety

FontFeature.stylisticSet(
  1. int value
)

Select a stylistic set. (ss01 through ss20)

Fonts may have up to 20 stylistic sets, numbered 1 through 20, each of which can be independently enabled or disabled.

For more fine-grained control, in some fonts individual character variants can also be controlled by the FontFeature.characterVariant feature (cvXX).

link
The Source Code Pro font supports the ssXX feature for several sets. In the example below, stylistic sets 2 (ss02), 3 (ss03), and 4 (ss04) are selected. Stylistic set 2 changes the rendering of the "a" character and the beta character, stylistic set 3 changes the lowercase "g", theta, and delta characters, and stylistic set 4 changes the lowercase "i" and "l" characters.

This font also supports character variants (see FontFeature.characterVariant).

To create a local project with this code sample, run:
flutter create --sample=dart.dart_ui.FontFeature.stylisticSet.1 mysample 
import 'dart:ui';

import 'package:flutter/widgets.dart';

void main() => runApp(const ExampleApp());

class ExampleApp extends StatelessWidget {
  const ExampleApp({super.key});

  @override
  Widget build(BuildContext context) {
    return WidgetsApp(
      builder: (BuildContext context, Widget? navigator) =>
          const ExampleWidget(),
      color: const Color(0xffffffff),
    );
  }
}

class ExampleWidget extends StatelessWidget {
  const ExampleWidget({super.key});

  @override
  Widget build(BuildContext context) {
    // The Source Code Pro font can be downloaded from Google Fonts (https://www.google.com/fonts).
    return Text(
      'aáâ β gǵĝ θб Iiíî Ll',
      style: TextStyle(
        fontFamily: 'Source Code Pro',
        fontFeatures: <FontFeature>[
          FontFeature.stylisticSet(2),
          FontFeature.stylisticSet(3),
          FontFeature.stylisticSet(4),
        ],
      ),
    );
  }
}

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The Piazzolla font supports the ssXX feature for more elaborate stylistic effects. Set 1 turns some Latin characters into Roman numerals, set 2 enables some ASCII characters to be used to create pretty arrows, and so forth.

These stylistic sets do not correspond to character variants.

To create a local project with this code sample, run:
flutter create --sample=dart.dart_ui.FontFeature.stylisticSet.2 mysample 
import 'dart:ui';

import 'package:flutter/widgets.dart';

void main() => runApp(const ExampleApp());

class ExampleApp extends StatelessWidget {
  const ExampleApp({super.key});

  @override
  Widget build(BuildContext context) {
    return WidgetsApp(
      builder: (BuildContext context, Widget? navigator) =>
          const ExampleWidget(),
      color: const Color(0xffffffff),
    );
  }
}

class ExampleWidget extends StatelessWidget {
  const ExampleWidget({super.key});

  @override
  Widget build(BuildContext context) {
    // The Piazzolla font can be downloaded from Google Fonts (https://www.google.com/fonts).
    return Text(
      '-> MCMXCVII <-', // 1997
      style: TextStyle(
        fontFamily: 'Piazzolla',
        fontFeatures: <FontFeature>[
          FontFeature.stylisticSet(1),
          FontFeature.stylisticSet(2),
        ],
      ),
    );
  }
}

See also:

Implementation

factory FontFeature.stylisticSet(int value) {
  assert(value >= 1);
  assert(value <= 20);
  return FontFeature('ss${value.toString().padLeft(2, "0")}');
}