浅念
258 lines
9.4 KiB
Dart
258 lines
9.4 KiB
Dart
/// UI-01 主题（视觉规范 §3.1 精确落地）。
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///
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/// 浅色基准：primary #1A73E8 / surface #FFFFFF / 页面背景 #F6F8FB /
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/// 主文字 #172033 / 次文字 #5E6878 / 分隔线 #E5EAF1；等待色 #996300 承载
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/// ColorScheme.secondary、错误 #B42318 承载 error。成功色**不进**
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/// ColorScheme（Material 无该语义角色），以独立令牌提供（见 ui/tokens.dart，
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/// 成功/等待/错误均另有深色提亮变体）。
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///
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/// 深色：语义对应色（深表面 + 浅文字 + 提亮的主色/等待色/错误色）；图片
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/// 与内容不做反色处理，沿用跟随系统的深浅色切换。容器色（secondary/
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/// primaryContainer 等）由种子色派生，与 #1A73E8 同系。
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///
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/// 字阶（fontSize 走 TextScaler，随系统字体缩放）：22 页面标题 /
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/// 17 分组标题 / 16-14 正文 / 13-12 辅助。组件：主按钮高 48（区间
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/// 48-52）、输入框与按钮圆角 12、卡片圆角 16、Dialog 圆角 16、
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/// BottomSheet 顶部圆角 16。动效时长常量见 ui/tokens.dart。
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library;
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import 'package:flutter/material.dart';
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import '../ui/tokens.dart';
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abstract final class AppTheme {
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/// Material 种子色（容器色派生基准）。
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static const Color seedColor = Color(0xFF1A73E8);
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// ── 浅色基准值（方案 §3.1）──────────────────────────────────────────
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static const Color _primary = Color(0xFF1A73E8);
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static const Color _onPrimary = Color(0xFFFFFFFF);
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static const Color _surface = Color(0xFFFFFFFF);
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static const Color _onSurface = Color(0xFF172033);
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static const Color _background = Color(0xFFF6F8FB);
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static const Color _textSecondary = Color(0xFF5E6878);
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static const Color _divider = Color(0xFFE5EAF1);
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static const Color _waiting = Color(0xFF996300);
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static const Color _onWaiting = Color(0xFFFFFFFF);
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static const Color _error = Color(0xFFB42318);
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// ── 深色对应语义值（同语义、深色表面提亮）──────────────────────────
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static const Color _primaryDark = Color(0xFF8AB4F8);
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static const Color _onPrimaryDark = Color(0xFF0B2E6F);
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static const Color _surfaceDark = Color(0xFF1F2530);
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static const Color _onSurfaceDark = Color(0xFFE6EAF2);
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static const Color _backgroundDark = Color(0xFF12161D);
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static const Color _textSecondaryDark = Color(0xFFA6B0C0);
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static const Color _dividerDark = Color(0xFF333B47);
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static const Color _waitingDark = Color(0xFFFCD34D);
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static const Color _onWaitingDark = Color(0xFF402E00);
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static const Color _errorDark = Color(0xFFF87171);
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static const Color _onErrorDark = Color(0xFF5C1A15);
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static ThemeData get light => _build(Brightness.light);
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static ThemeData get dark => _build(Brightness.dark);
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static ThemeData _build(Brightness brightness) {
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final dark = brightness == Brightness.dark;
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final colorScheme =
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ColorScheme.fromSeed(
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seedColor: seedColor,
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brightness: brightness,
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).copyWith(
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primary: dark ? _primaryDark : _primary,
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onPrimary: dark ? _onPrimaryDark : _onPrimary,
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secondary: dark ? _waitingDark : _waiting,
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onSecondary: dark ? _onWaitingDark : _onWaiting,
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error: dark ? _errorDark : _error,
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onError: dark ? _onErrorDark : Colors.white,
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surface: dark ? _surfaceDark : _surface,
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onSurface: dark ? _onSurfaceDark : _onSurface,
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surfaceContainerHighest: dark ? _dividerDark : _divider,
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onSurfaceVariant: dark ? _textSecondaryDark : _textSecondary,
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);
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final textTheme = _textTheme(colorScheme);
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final buttonBorder = RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(kRadiusInput),
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);
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return ThemeData(
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brightness: brightness,
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colorScheme: colorScheme,
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scaffoldBackgroundColor: dark ? _backgroundDark : _background,
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textTheme: textTheme,
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// AppBar：干净（零海拔 + 页面背景同色），标题用 titleLarge。
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appBarTheme: AppBarTheme(
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backgroundColor: dark ? _backgroundDark : _background,
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surfaceTintColor: Colors.transparent,
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foregroundColor: colorScheme.onSurface,
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titleTextStyle: textTheme.titleLarge,
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elevation: 0,
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scrolledUnderElevation: 1,
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centerTitle: false,
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),
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// 按钮：主/次操作统一高 48（规格 48-52）、圆角 12。
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filledButtonTheme: FilledButtonThemeData(
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style: FilledButton.styleFrom(
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minimumSize: const Size(64, 48),
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shape: buttonBorder,
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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(64, 48),
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shape: buttonBorder,
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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(48, 48),
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shape: buttonBorder,
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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(48, 48),
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shape: buttonBorder,
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),
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),
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// 输入框：圆角 12，轻分隔线边框，聚焦主色 2px。
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inputDecorationTheme: InputDecorationTheme(
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border: _inputBorder(colorScheme, colorScheme.outline),
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enabledBorder: _inputBorder(
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colorScheme,
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dark ? _dividerDark : _divider,
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),
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focusedBorder: _inputBorder(colorScheme, colorScheme.primary, width: 2),
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errorBorder: _inputBorder(colorScheme, colorScheme.error),
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focusedErrorBorder: _inputBorder(
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colorScheme,
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colorScheme.error,
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width: 2,
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),
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contentPadding: const EdgeInsets.symmetric(
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horizontal: kSpace16,
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vertical: kSpace12,
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),
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),
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// 卡片：白色表面（深色深表面）、圆角 16、轻阴影。
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cardTheme: CardThemeData(
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color: colorScheme.surface,
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surfaceTintColor: Colors.transparent,
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elevation: 1,
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shadowColor: Colors.black.withValues(alpha: dark ? 0.4 : 0.08),
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(kRadiusCard),
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),
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),
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// Dialog 圆角 16；BottomSheet 仅顶部圆角 16。
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dialogTheme: DialogThemeData(
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surfaceTintColor: Colors.transparent,
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(kRadiusCard),
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),
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),
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bottomSheetTheme: BottomSheetThemeData(
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backgroundColor: colorScheme.surface,
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surfaceTintColor: Colors.transparent,
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shape: const RoundedRectangleBorder(
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borderRadius: BorderRadius.vertical(
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top: Radius.circular(kRadiusCard),
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),
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),
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),
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// Snackbar：浮动 + inverseSurface（自动随深浅色），动作色 inversePrimary。
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snackBarTheme: SnackBarThemeData(
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behavior: SnackBarBehavior.floating,
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backgroundColor: colorScheme.inverseSurface,
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contentTextStyle: textTheme.bodyMedium?.copyWith(
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color: colorScheme.onInverseSurface,
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),
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actionTextColor: colorScheme.inversePrimary,
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),
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// 底部导航：白色表面（深色深表面）+ 派生容器色指示器。
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navigationBarTheme: NavigationBarThemeData(
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backgroundColor: colorScheme.surface,
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surfaceTintColor: Colors.transparent,
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indicatorColor: colorScheme.secondaryContainer,
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height: 80,
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labelTextStyle: WidgetStatePropertyAll(
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textTheme.labelMedium!.copyWith(
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color: colorScheme.onSurface,
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fontWeight: FontWeight.w500,
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),
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),
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),
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// 轻分隔线（不用粗边框）。
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dividerTheme: DividerThemeData(
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color: dark ? _dividerDark : _divider,
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thickness: 1,
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space: 1,
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),
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);
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}
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static OutlineInputBorder _inputBorder(
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ColorScheme scheme,
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Color color, {
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double width = 1,
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}) => OutlineInputBorder(
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borderRadius: BorderRadius.circular(kRadiusInput),
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borderSide: BorderSide(color: color, width: width),
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);
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/// 字阶（方案 §3.1）：22 页面标题 / 17 分组 / 16-14 正文 / 13-12 辅助。
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///
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/// 只声明 fontSize/字重/颜色，字体族与缩放交给默认排版 + TextScaler
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/// （fontSize 随系统字体大小缩放）。
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static TextTheme _textTheme(ColorScheme scheme) {
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final onSurface = scheme.onSurface;
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final onSecondaryText = scheme.onSurfaceVariant;
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return TextTheme(
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titleLarge: TextStyle(
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fontSize: 22,
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fontWeight: FontWeight.w600,
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color: onSurface,
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),
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titleMedium: TextStyle(
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fontSize: 17,
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fontWeight: FontWeight.w600,
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color: onSurface,
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),
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titleSmall: TextStyle(
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fontSize: 16,
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fontWeight: FontWeight.w600,
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color: onSurface,
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),
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bodyLarge: TextStyle(fontSize: 16, color: onSurface),
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bodyMedium: TextStyle(fontSize: 14, color: onSurface),
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bodySmall: TextStyle(fontSize: 13, color: onSecondaryText),
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labelLarge: TextStyle(
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fontSize: 14,
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fontWeight: FontWeight.w500,
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color: onSurface,
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),
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labelMedium: TextStyle(
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fontSize: 12,
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fontWeight: FontWeight.w500,
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color: onSurface,
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),
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labelSmall: TextStyle(
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fontSize: 12,
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fontWeight: FontWeight.w500,
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color: onSecondaryText,
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),
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);
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}
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}
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