flutter架 构项目基础
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崔宝新
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import 'package:flutter/material.dart';
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import 'package:flutter_screenutil/flutter_screenutil.dart';
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import 'package:new_learn/core/theme/brand_theme.dart';
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/// ============================================================
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/// 【ThemeDemoPage】品牌换肤 Demo（两级主题模型）
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///
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/// 一、两级模型（模型与配置已解耦，见 core/theme/）：
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/// core/theme/brand_theme.dart ← 模型（BrandTheme/PageTheme/PageLevel）
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/// + 注册表 brandThemes
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/// core/theme/brands/xxx_theme.dart← 每品牌一个文件，只有具体配置
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/// 一级 = 品牌：seedColor 生成整套 Material 色板（全 App 共享）；
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/// 二级 = 页面细节（PageTheme）：按页面层级（home/detail/result）
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/// 区分背景色 / 头部色 / 强调色 / 专属 banner / 标题文案。
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/// 页面只声明"我是哪个层级"，细节从品牌对象按层级查出来：
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/// 换品牌 → 一级色板全换 + 二级细节全换（一套代码）
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///
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/// 二、本页怎么实现切换（不依赖全局 MaterialApp）：
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/// 页面根部用 Theme(data:) 局部覆盖——ThemeData 以全局为基底，
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/// 局部 Theme 再套一层，页面内组件（AppBar/Button/进度条）都从
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/// 局部主题取色。真实项目里把"_brand"换成 Riverpod Provider +
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/// MaterialApp 的 theme，切换点就移到根层（见注释）。
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///
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/// 三、资源（图片）怎么做：
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/// 真实项目 PageTheme.banner 存资源路径（如 assets/img/banner_sky.png），
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/// 页面 Image.asset(page.banner) 即可跟随换图。本 demo 没有两套图片
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/// 资源，用"强调色渐变块"模拟 banner 占位（代码里标注了替换点）。
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///
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/// 四、高频坑：
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/// 1. colorSchemeSeed 生成的 primary 不是精确色值（Material 会调和），
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/// 要求精确用 ColorScheme.fromSeed 后手动覆盖 primary；
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/// 2. 局部 Theme(data:) 必须包在 Scaffold 外面，AppBar 才能取到；
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/// 3. PNG 位图不跟主题着色，能矢量（IconData）就别放多份图。
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/// ============================================================
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class ThemeDemoPage extends StatefulWidget {
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const ThemeDemoPage({super.key});
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@override
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State<ThemeDemoPage> createState() => _ThemeDemoPageState();
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}
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class _ThemeDemoPageState extends State<ThemeDemoPage> {
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/// 当前品牌（真实项目 → Riverpod Provider + shared_preferences 持久化）
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BrandTheme _brand = brandThemes.first;
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@override
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Widget build(BuildContext context) {
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// 局部主题覆盖：colorSchemeSeed 换 seed = 页面内所有 Material
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// 组件自动换色（真实项目这里换成 MaterialApp.theme）
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return Theme(
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data: ThemeData(colorSchemeSeed: _brand.seedColor),
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child: Scaffold(
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appBar: AppBar(
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backgroundColor: Theme.of(context).colorScheme.primary,
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foregroundColor: Colors.white,
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title: Text('品牌换肤 Demo（${_brand.name}）'),
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),
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body: SingleChildScrollView(
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padding: EdgeInsets.all(16.w),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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// ---------- 品牌切换 ----------
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Wrap(
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spacing: 8,
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children: [
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for (final b in brandThemes) // 注册表：新增品牌自动出现
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ChoiceChip(
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label: Text(b.name),
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selected: _brand.name == b.name,
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onSelected: (_) => setState(() => _brand = b),
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),
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],
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),
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SizedBox(height: 16.h),
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_buildGlobalCard(),
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SizedBox(height: 16.h),
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_buildSectionTitle('二级：页面细节（按层级，随品牌联动）'),
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SizedBox(height: 8.h),
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// 三个层级各渲染一个"页面骨架预览"
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_PagePreview(
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level: 'home（任务 tab）',
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page: _brand.pages[PageLevel.home]!,
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),
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_PagePreview(
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level: 'detail（子详情页）',
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page: _brand.pages[PageLevel.detail]!,
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),
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_PagePreview(
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level: 'result（答题结果页）',
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page: _brand.pages[PageLevel.result]!,
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),
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],
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),
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),
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),
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);
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}
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/// 一级：全局色板效果区（Material 组件自动跟随 seed）
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Widget _buildGlobalCard() {
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final scheme = Theme.of(context).colorScheme;
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return Container(
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padding: EdgeInsets.all(16.w),
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decoration: BoxDecoration(
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color: Colors.white,
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borderRadius: BorderRadius.circular(12.r),
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border: Border.all(color: const Color(0xFFEEF1F5)),
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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_buildSectionTitle('一级：全局色板（seed: ${_brand.seedColor}）'),
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SizedBox(height: 8.h),
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// seed 色与生成的 primary 对比
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Row(
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children: [
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_colorChip('seed', _brand.seedColor),
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SizedBox(width: 8.w),
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_colorChip('primary', scheme.primary),
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],
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),
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SizedBox(height: 12.h),
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// Material 组件不用改代码，seed 一变自动换色
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FilledButton(onPressed: () {}, child: const Text('跟随主题的按钮')),
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SizedBox(height: 12.h),
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LinearProgressIndicator(
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value: 0.6,
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backgroundColor: scheme.surfaceContainerHighest,
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),
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],
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),
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);
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}
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Widget _colorChip(String label, Color color) {
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return Container(
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padding: EdgeInsets.symmetric(horizontal: 10.w, vertical: 6.h),
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decoration: BoxDecoration(
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color: color,
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borderRadius: BorderRadius.circular(6.r),
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),
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child: Text(
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label,
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style: const TextStyle(color: Colors.white, fontSize: 12),
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),
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);
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}
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Widget _buildSectionTitle(String title) {
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return Text(
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title,
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style: TextStyle(
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fontSize: 14.sp,
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fontWeight: FontWeight.w600,
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color: const Color(0xFF3B82F6),
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),
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);
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}
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}
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// ==================== 页面骨架预览（演示二级细节怎么被消费） ====================
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class _PagePreview extends StatelessWidget {
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const _PagePreview({required this.level, required this.page});
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/// 本页属于哪个层级（页面只声明层级，细节全从主题查）
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final String level;
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final PageTheme page;
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@override
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Widget build(BuildContext context) {
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return Container(
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margin: EdgeInsets.only(bottom: 12.h),
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decoration: BoxDecoration(
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color: page.bg, // ← 二级：背景
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borderRadius: BorderRadius.circular(12.r),
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border: Border.all(color: const Color(0xFFE5E7EB)),
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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// 模拟 AppBar 条（真实页面是 Scaffold.appBar）
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Container(
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padding: EdgeInsets.symmetric(horizontal: 12.w, vertical: 10.h),
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decoration: BoxDecoration(
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color: page.headerBg, // ← 二级：头部色
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borderRadius: BorderRadius.vertical(top: Radius.circular(12.r)),
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),
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child: Row(
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children: [
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const Icon(Icons.arrow_back_ios_new,
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color: Colors.white, size: 14),
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SizedBox(width: 6.w),
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Text(
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page.title, // ← 二级：标题文案
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style: const TextStyle(
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color: Colors.white,
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fontSize: 14,
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fontWeight: FontWeight.w600,
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),
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),
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],
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),
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),
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Padding(
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padding: EdgeInsets.all(12.w),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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// banner 占位：真实项目这里替换成 Image.asset(page.banner!)
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// （banner 为 null 的层级显示"本层无专属图"）
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Container(
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width: double.infinity,
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height: 44.h,
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decoration: BoxDecoration(
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gradient: LinearGradient(
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colors: [page.accent, page.headerBg],
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),
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borderRadius: BorderRadius.circular(8.r),
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),
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alignment: Alignment.center,
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child: Text(
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page.banner ?? '本层无专属 banner',
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style: const TextStyle(color: Colors.white, fontSize: 12),
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),
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),
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SizedBox(height: 8.h),
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Text(
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'层级：$level\n背景 ${page.bg} · 头部 ${page.headerBg} · 强调 ${page.accent}',
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style: TextStyle(
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fontSize: 12.sp,
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height: 1.5,
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color: const Color(0xFF666666),
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),
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),
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SizedBox(height: 8.h),
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FilledButton(
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style: FilledButton.styleFrom(
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backgroundColor: page.accent, // ← 二级：强调色
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),
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onPressed: () {},
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child: const Text('本页主按钮'),
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),
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],
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),
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),
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],
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),
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);
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}
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}
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