fromSeed static method

ThemeData fromSeed({ required Color seedColor, bool isDark = false, FontConfig? fontConfig, String fontFamily = 'Inter', TextDirection direction = TextDirection.ltr, double borderRadius = 12.0, VisualDensity? visualDensity, })

Generates a ThemeData from a seed color.

• seedColor: The primary seed color for the Material 3 color scheme.
• isDark: Whether to generate a dark or light theme.
• fontConfig: Direction-aware font configuration (preferred). Supports separate LTR and RTL fonts from Google Fonts or local assets.
• fontFamily: Legacy — a Google Font family name (e.g., 'Poppins'). Use fontConfig instead for RTL support.
• direction: Text direction to use when resolving fontConfig.
• borderRadius: Global border radius for buttons, cards, and inputs.
• visualDensity: UI density setting.

Implementation

static ThemeData fromSeed({
  required Color seedColor,
  bool isDark = false,
  FontConfig? fontConfig,
  String fontFamily = 'Inter',
  TextDirection direction = TextDirection.ltr,
  double borderRadius = 12.0,
  VisualDensity? visualDensity,
}) {
  final colorScheme = ColorScheme.fromSeed(
    seedColor: seedColor,
    brightness: isDark ? Brightness.dark : Brightness.light,
  );

  final TextTheme textTheme;
  if (fontConfig != null) {
    textTheme = fontConfig.resolveTextTheme(direction, ThemeData().textTheme);
  } else {
    textTheme = _buildTextTheme(fontFamily, colorScheme);
  }
  final radius = Radius.circular(borderRadius);
  final shapeBorder = RoundedRectangleBorder(
    borderRadius: BorderRadius.all(radius),
  );

  return ThemeData(
    useMaterial3: true,
    colorScheme: colorScheme,
    brightness: isDark ? Brightness.dark : Brightness.light,
    textTheme: textTheme,
    visualDensity: visualDensity ?? VisualDensity.standard,

    // Cards
    cardTheme: CardThemeData(
      elevation: 0,
      shape: shapeBorder,
      color: colorScheme.surfaceContainerLow,
    ),

    // Buttons
    filledButtonTheme: FilledButtonThemeData(
      style: FilledButton.styleFrom(
        shape: shapeBorder,
        padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 14),
      ),
    ),
    outlinedButtonTheme: OutlinedButtonThemeData(
      style: OutlinedButton.styleFrom(
        shape: shapeBorder,
        padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 14),
      ),
    ),
    textButtonTheme: TextButtonThemeData(
      style: TextButton.styleFrom(
        shape: shapeBorder,
      ),
    ),
    elevatedButtonTheme: ElevatedButtonThemeData(
      style: ElevatedButton.styleFrom(
        shape: shapeBorder,
        padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 14),
      ),
    ),

    // Inputs
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: colorScheme.surfaceContainerHighest.withValues(alpha: 0.4),
      border: OutlineInputBorder(
        borderRadius: BorderRadius.all(radius),
        borderSide:
            BorderSide(color: colorScheme.outline.withValues(alpha: 0.3)),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.all(radius),
        borderSide:
            BorderSide(color: colorScheme.outline.withValues(alpha: 0.3)),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.all(radius),
        borderSide: BorderSide(color: colorScheme.primary, width: 2),
      ),
      errorBorder: OutlineInputBorder(
        borderRadius: BorderRadius.all(radius),
        borderSide: BorderSide(color: colorScheme.error),
      ),
      contentPadding:
          const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
    ),

    // Dialogs
    dialogTheme: DialogThemeData(
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.all(Radius.circular(borderRadius + 4)),
      ),
    ),

    // Bottom sheets
    bottomSheetTheme: BottomSheetThemeData(
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(
          top: Radius.circular(borderRadius + 8),
        ),
      ),
    ),

    // Chips
    chipTheme: ChipThemeData(
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.all(Radius.circular(borderRadius)),
      ),
    ),

    // Page transitions
    pageTransitionsTheme: const PageTransitionsTheme(
      builders: {
        TargetPlatform.android: FadeUpwardsPageTransitionsBuilder(),
        TargetPlatform.windows: FadeUpwardsPageTransitionsBuilder(),
        TargetPlatform.linux: FadeUpwardsPageTransitionsBuilder(),
      },
    ),
  );
}