feat(apps): establish shared mobile design system
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209
apps/heqi_design_system/lib/src/theme.dart
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209
apps/heqi_design_system/lib/src/theme.dart
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import 'package:flutter/material.dart';
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import 'tokens.dart';
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/// 共享 Material 3 主题。业务 App 只能选择品牌，不应复制本主题后自行修改。
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abstract final class HeqiTheme {
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static ThemeData light(HeqiBrand brand) => _theme(brand, Brightness.light);
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static ThemeData dark(HeqiBrand brand) => _theme(brand, Brightness.dark);
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static ThemeData _theme(HeqiBrand brand, Brightness brightness) {
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final dark = brightness == Brightness.dark;
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final seed = switch (brand) {
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HeqiBrand.consumer => HeqiColors.consumerPrimary,
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HeqiBrand.service => HeqiColors.servicePrimary,
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};
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final darkPrimary = switch (brand) {
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HeqiBrand.consumer => const Color(0xFFAFC6FF),
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HeqiBrand.service => const Color(0xFFC5C0FF),
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};
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final scheme = ColorScheme.fromSeed(
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seedColor: seed,
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brightness: brightness,
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primary: dark ? darkPrimary : seed,
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secondary: dark ? const Color(0xFF86D7B5) : HeqiColors.success,
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error: dark ? const Color(0xFFFFB4AB) : HeqiColors.danger,
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surface: dark ? HeqiColors.darkSurface : Colors.white,
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);
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final textTheme = _textTheme;
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final radius = BorderRadius.circular(HeqiRadius.large);
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return ThemeData(
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brightness: brightness,
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useMaterial3: true,
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colorScheme: scheme,
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scaffoldBackgroundColor: dark
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? HeqiColors.darkBackground
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: HeqiColors.lightBackground,
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textTheme: textTheme,
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visualDensity: VisualDensity.standard,
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appBarTheme: AppBarTheme(
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backgroundColor: Colors.transparent,
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foregroundColor: scheme.onSurface,
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elevation: 0,
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scrolledUnderElevation: 0,
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centerTitle: false,
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titleTextStyle: textTheme.titleLarge?.copyWith(color: scheme.onSurface),
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),
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cardTheme: CardThemeData(
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color: scheme.surface,
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elevation: 0,
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margin: EdgeInsets.zero,
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shape: RoundedRectangleBorder(
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borderRadius: radius,
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side: BorderSide(color: scheme.outlineVariant),
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),
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),
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inputDecorationTheme: InputDecorationTheme(
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filled: true,
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fillColor: dark ? scheme.surfaceContainerHigh : scheme.surface,
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contentPadding: const EdgeInsets.symmetric(
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horizontal: HeqiSpacing.x4,
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vertical: HeqiSpacing.x4,
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),
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border: OutlineInputBorder(
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borderRadius: radius,
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borderSide: BorderSide.none,
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),
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enabledBorder: OutlineInputBorder(
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borderRadius: radius,
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borderSide: BorderSide(color: scheme.outlineVariant),
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),
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focusedBorder: OutlineInputBorder(
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borderRadius: radius,
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borderSide: BorderSide(color: scheme.primary, width: 2),
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),
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errorBorder: OutlineInputBorder(
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borderRadius: radius,
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borderSide: BorderSide(color: scheme.error),
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),
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),
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filledButtonTheme: FilledButtonThemeData(
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style: FilledButton.styleFrom(
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minimumSize: const Size.fromHeight(HeqiSize.buttonHeight),
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shape: RoundedRectangleBorder(borderRadius: radius),
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textStyle: textTheme.labelLarge,
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),
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),
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elevatedButtonTheme: ElevatedButtonThemeData(
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style: ElevatedButton.styleFrom(
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minimumSize: const Size.fromHeight(HeqiSize.buttonHeight),
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elevation: 0,
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shape: RoundedRectangleBorder(borderRadius: radius),
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textStyle: textTheme.labelLarge,
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),
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),
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outlinedButtonTheme: OutlinedButtonThemeData(
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style: OutlinedButton.styleFrom(
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minimumSize: const Size.fromHeight(HeqiSize.buttonHeight),
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shape: RoundedRectangleBorder(borderRadius: radius),
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textStyle: textTheme.labelLarge,
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),
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),
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textButtonTheme: TextButtonThemeData(
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style: TextButton.styleFrom(
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minimumSize: const Size.square(HeqiSize.minTouchTarget),
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textStyle: textTheme.labelLarge,
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),
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),
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navigationBarTheme: NavigationBarThemeData(
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height: HeqiSize.navigationBarHeight,
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elevation: 0,
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backgroundColor: scheme.surface,
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indicatorColor: scheme.primaryContainer,
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labelTextStyle: WidgetStateProperty.resolveWith(
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(states) => textTheme.labelSmall?.copyWith(
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color: states.contains(WidgetState.selected)
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? scheme.primary
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: scheme.onSurfaceVariant,
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fontWeight: states.contains(WidgetState.selected)
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? FontWeight.w700
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: FontWeight.w500,
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),
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),
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),
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chipTheme: ChipThemeData(
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side: BorderSide.none,
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(HeqiRadius.small),
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),
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labelStyle: textTheme.labelSmall,
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),
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listTileTheme: const ListTileThemeData(
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minTileHeight: 56,
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contentPadding: EdgeInsets.symmetric(
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horizontal: HeqiSpacing.x4,
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vertical: HeqiSpacing.x1,
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),
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),
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bottomSheetTheme: BottomSheetThemeData(
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backgroundColor: scheme.surface,
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modalBackgroundColor: scheme.surface,
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showDragHandle: true,
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shape: const RoundedRectangleBorder(
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borderRadius: BorderRadius.vertical(
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top: Radius.circular(HeqiRadius.sheet),
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),
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),
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),
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dialogTheme: DialogThemeData(
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backgroundColor: scheme.surface,
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(HeqiRadius.sheet),
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),
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),
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dividerTheme: DividerThemeData(
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color: scheme.outlineVariant,
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thickness: 1,
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space: 1,
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),
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snackBarTheme: SnackBarThemeData(
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behavior: SnackBarBehavior.floating,
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(HeqiRadius.medium),
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),
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),
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);
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}
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static const _textTheme = TextTheme(
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displaySmall: TextStyle(
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fontSize: 32,
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height: 1.25,
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fontWeight: FontWeight.w700,
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),
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headlineMedium: TextStyle(
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fontSize: 28,
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height: 1.28,
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fontWeight: FontWeight.w700,
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),
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headlineSmall: TextStyle(
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fontSize: 24,
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height: 1.33,
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fontWeight: FontWeight.w700,
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),
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titleLarge: TextStyle(
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fontSize: 22,
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height: 1.27,
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fontWeight: FontWeight.w600,
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),
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titleMedium: TextStyle(
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fontSize: 16,
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height: 1.5,
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fontWeight: FontWeight.w600,
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),
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bodyLarge: TextStyle(fontSize: 16, height: 1.5),
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bodyMedium: TextStyle(fontSize: 14, height: 1.55),
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labelLarge: TextStyle(
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fontSize: 14,
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height: 1.4,
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fontWeight: FontWeight.w600,
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),
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labelSmall: TextStyle(
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fontSize: 12,
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height: 1.35,
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fontWeight: FontWeight.w500,
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),
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);
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}
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