fluent_2_core #

Fluent 2 design tokens, theming and app shell for Flutter. The shared foundation under every fluent_2_* UI package — depend on this directly only if you are building your own component layer; otherwise use fluent_2, which re-exports it.

import 'package:fluent_2_core/fluent_2_core.dart';

final theme = FluentTheme.of(context);
theme.colors.brandBackground;          // alias token
theme.typography.subtitle1;            // type ramp
theme.shadow(FluentElevation.shadow8); // two-layer elevation
FluentSpacing.l;                       // 16
FluentRadius.medium;                   // 4
FluentDuration.normal;                 // 200ms
FluentCurve.decelerateMid;             // entrance easing

What's here #

FluentThemeData selects the current platform's typography ramp by default. Use fontPlatform only to preview another surface:

final webPreview = FluentThemeData.light(
  fontPlatform: FluentFontPlatform.web,
);

FluentApp loads Selawik automatically on Web and Windows. FluentFonts is re-exported by core for applications that need to preload it before runApp.

Token provenance, the brand-ramp algorithm and known upstream conflicts are documented in the repository README.

Overriding tokens #

Every token is a virtual getter, so there is no copyWith plumbing — subclass:

class MyColors extends FluentColors {
  const MyColors();
  @override
  Color get brandBackground => const Color(0xFF7B2D8E);
}