WIP: markdown reader, data migration, 编辑器增强等

lib/pages/home_page.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import '../providers/app_provider.dart';
+import '../utils/user_prefs.dart';
 import '../widgets/custom_drawer.dart';
 import '../widgets/bottom_nav_bar.dart';
 import 'main_content_page.dart';
@@ -15,47 +16,132 @@ class HomePage extends StatefulWidget {
 }
 
 class _HomePageState extends State<HomePage> {
+  /// 当前正在滑动的页面索引（用于PageView）
+  final PageController _pageController = PageController();
+
+  @override
+  void dispose() {
+    _pageController.dispose();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       // 左侧弹出菜单（仅在主页显示）
-      drawer: context.watch<AppProvider>().bottomNavIndex == 0 
-          ? CustomDrawer() 
+      drawer: context.watch<AppProvider>().bottomNavIndex == 0
+          ? CustomDrawer()
           : null,
-      
-      // 主体内容 - 使用 Stack 让 dock 栏悬浮在内容上方
-      body: Stack(
-        children: [
-          // 底层：主体内容
-          _buildBody(),
-          
-          // 顶层：悬浮 dock 栏
-          const Positioned(
-            left: 0,
-            right: 0,
-            bottom: 0,
-            child: CustomBottomNavBar(),
-          ),
-        ],
+
+      // 主体内容
+      body: Consumer<AppProvider>(
+        builder: (context, provider, child) {
+          // 同步底部导航栏和 PageView 的页面
+          final currentPage = provider.bottomNavIndex == 0 ? 0 : 1;
+          if (_pageController.hasClients && _pageController.page?.round() != currentPage) {
+            _pageController.jumpToPage(currentPage);
+          }
+
+          return NotificationListener<ScrollNotification>(
+            onNotification: (notification) {
+              if (notification is ScrollUpdateNotification) {
+                final delta = notification.scrollDelta;
+                if (delta != null && delta.abs() > 2) {
+                  // 根据用户设置决定是否启用滚动隐藏
+                  final userPrefs = UserPrefs();
+                  if (!userPrefs.hideBottomNavOnScroll) return false;
+                  if (delta < 0) {
+                    // 下拉（内容向下滚动）- 显示导航栏
+                    provider.setBottomNavVisible(true);
+                  } else {
+                    // 上滑（内容向上滚动）- 隐藏导航栏
+                    provider.setBottomNavVisible(false);
+                  }
+                }
+              }
+              return false;
+            },
+            child: Stack(
+              children: [
+                // 底层：主体内容（支持左右滑动切换）
+                _buildPageView(provider),
+
+                // 底部导航栏（带动画）
+                Positioned(
+                  left: 0,
+                  right: 0,
+                  bottom: 0,
+                  child: AnimatedSlide(
+                    offset: provider.bottomNavVisible ? Offset.zero : const Offset(-1, 0),
+                    duration: const Duration(milliseconds: 300),
+                    curve: Curves.easeInOut,
+                    child: const CustomBottomNavBar(),
+                  ),
+                ),
+
+                // 导航栏隐藏时的展开按钮
+                if (!provider.bottomNavVisible)
+                  Positioned(
+                    left: 0,
+                    bottom: MediaQuery.of(context).padding.bottom + 20,
+                    child: GestureDetector(
+                      onTap: () => provider.setBottomNavVisible(true),
+                      onHorizontalDragEnd: (details) {
+                        if (details.primaryVelocity != null &&
+                            details.primaryVelocity! > 0) {
+                          provider.setBottomNavVisible(true);
+                        }
+                      },
+                      child: Container(
+                        width: 44,
+                        height: 56,
+                        decoration: BoxDecoration(
+                          color: Colors.white,
+                          borderRadius: const BorderRadius.horizontal(
+                              right: Radius.circular(28)),
+                          boxShadow: [
+                            BoxShadow(
+                              color: Colors.black.withOpacity(0.08),
+                              blurRadius: 20,
+                              offset: const Offset(0, 4),
+                              spreadRadius: 0,
+                            ),
+                          ],
+                        ),
+                        child: const Center(
+                          child: Icon(
+                            Icons.chevron_right,
+                            color: Color(0xFF999999),
+                            size: 24,
+                          ),
+                        ),
+                      ),
+                    ),
+                  ),
+              ],
+            ),
+          );
+        },
       ),
     );
   }
 
-  /// 构建主体内容
-  Widget _buildBody() {
-    return Consumer<AppProvider>(
-      builder: (context, provider, child) {
-        switch (provider.bottomNavIndex) {
-          case 0:
-            // 主页 - 观影/阅读/笔记
-            return const MainContentPage();
-          case 2:
-            // 我的页面
-            return const ProfilePage();
-          default:
-            return const MainContentPage();
+  /// 构建主体内容（使用 PageView 支持左右滑动切换）
+  Widget _buildPageView(AppProvider provider) {
+    return PageView(
+      controller: _pageController,
+      physics: const BouncingScrollPhysics(),
+      onPageChanged: (index) {
+        if (index == 0) {
+          provider.setBottomNavIndex(0);
+        } else if (index == 1) {
+          provider.setBottomNavIndex(2);
         }
       },
+      children: [
+        const MainContentPage(),
+        const ProfilePage(),
+      ],
     );
   }
 }