99 lines
3.3 KiB
Dart
99 lines
3.3 KiB
Dart
import 'dart:async';
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import 'package:flutter/material.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import '../../core/theme/app_theme.dart';
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import '../../providers/feed_provider.dart';
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import '../../screens/category/category_screen.dart';
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import '../../screens/feed/feed_screen.dart';
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import '../../screens/notification/notifications_screen.dart';
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import '../../screens/profile/mine_screen.dart';
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import '../../screens/upload/upload_screen.dart';
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/// 首页壳：底部 Tab（首页/分类/发布/消息/我的），02-技术文档信息架构
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/// IndexedStack 保活各 Tab 状态（Feed 播放器池 / 分类滚动位置 / 上传流程不被销毁）
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class HomeShell extends ConsumerStatefulWidget {
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const HomeShell({super.key});
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@override
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ConsumerState<HomeShell> createState() => _HomeShellState();
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}
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class _HomeShellState extends ConsumerState<HomeShell> {
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int _index = 0;
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/// Feed 三种策略的 provider keys（切 Tab 时用于暂停/恢复播放器池）
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static const _feedStrategies = FeedStrategy.values;
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void _onTabSelected(int i) {
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if (i == _index) return;
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// 切到非首页：挂起所有 Feed 策略池——suspend 记录断点后 stop 全槽位
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// （mpv pause 停不住 HLS 预读，只有 stop 能可靠断下载）；
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// 回首页 rebind 重新 open + seek 断点续播，缓存分片零流量（抖音行为）
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if (i != 0) {
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for (final s in _feedStrategies) {
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ref.read(feedProvider(s).notifier).pool.suspend();
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}
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}
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ref.read(feedTabVisibleProvider.notifier).state = i == 0;
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setState(() => _index = i);
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// 切回首页：只恢复当前选中策略的池（其余保持挂起）
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if (i == 0) {
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final active = ref.read(activeFeedStrategyProvider);
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final notifier = ref.read(feedProvider(active).notifier);
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unawaited(() async {
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await notifier.pool.resume();
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// 兜底：挂起期间首屏 bind 可能尚未发生，补一次当前页绑定播放
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await notifier.rebindCurrent();
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}());
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}
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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body: IndexedStack(
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index: _index,
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children: const [
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FeedScreen(),
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CategoryScreen(),
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UploadScreen(),
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NotificationsScreen(),
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MineScreen(),
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],
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),
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bottomNavigationBar: NavigationBar(
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height: 60,
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backgroundColor: AppColors.surface,
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indicatorColor: AppColors.primary.withValues(alpha: 0.2),
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selectedIndex: _index,
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onDestinationSelected: _onTabSelected,
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destinations: const [
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NavigationDestination(
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icon: Icon(Icons.home_outlined),
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selectedIcon: Icon(Icons.home, color: AppColors.primary),
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label: '首页',
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),
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NavigationDestination(
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icon: Icon(Icons.grid_view_outlined),
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label: '分类',
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),
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NavigationDestination(
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icon: Icon(Icons.add_box_outlined),
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label: '发布',
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),
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NavigationDestination(
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icon: Icon(Icons.notifications_none),
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label: '消息',
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),
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NavigationDestination(
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icon: Icon(Icons.person_outline),
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label: '我的',
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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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