针对readme部分做性能优化，目标帧率120达成

lib/pages/changelog_page.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart'; // 🟢 添加这一行
 import 'package:flutter/services.dart' show rootBundle;
 import 'package:flutter_markdown/flutter_markdown.dart';
 
@@ -9,15 +10,85 @@ class ChangelogPage extends StatefulWidget {
   State<ChangelogPage> createState() => _ChangelogPageState();
 }
 
-class _ChangelogPageState extends State<ChangelogPage> {
+class _ChangelogPageState extends State<ChangelogPage>
+    with SingleTickerProviderStateMixin {
+  // ---------- 数据 ----------
   String _markdownContent = '';
   bool _isLoading = true;
   String? _error;
+  Widget? _cachedMarkdown;
 
+  // ---------- 滚动 ----------
+  final ScrollController _scrollController = ScrollController();
+  double _scrollProgress = 0.0;
+  bool _isScrolling = false;
+
+  // ---------- 呼吸动画（维持高刷感知） ----------
+  late AnimationController _breathController;
+  late Animation<double> _breathAnimation;
+
+  // ---------- 原生刷新率控制 ----------
+  // 🟢 改用 static final（不是 const）
+  static final _frameRateChannel = MethodChannel(
+    'com.lxh.battery_health/frame_rate',
+  );
+
+  // ---------- 生命周期 ----------
   @override
   void initState() {
     super.initState();
     _loadChangelog();
+
+    // 进入页面时申请高刷（原生层）
+    _frameRateChannel.invokeMethod('setHighRefreshRate');
+
+    // 呼吸动画：让进度条在滚动时轻微抖动，维持高刷感知
+    _breathController = AnimationController(
+      vsync: this,
+      duration: const Duration(milliseconds: 500),
+    )..repeat(reverse: true);
+
+    _breathAnimation = Tween<double>(begin: 0.0, end: 0.03).animate(
+      CurvedAnimation(parent: _breathController, curve: Curves.easeInOut),
+    );
+
+    _scrollController.addListener(() {
+      _updateProgress();
+      final isScrolling = _scrollController.position.isScrollingNotifier.value;
+      if (isScrolling != _isScrolling) {
+        setState(() {
+          _isScrolling = isScrolling;
+        });
+        if (isScrolling) {
+          _breathController.repeat(reverse: true);
+        } else {
+          _breathController.stop();
+          _breathController.reset();
+        }
+      }
+    });
+  }
+
+  @override
+  void dispose() {
+    // 离开页面时恢复默认刷新率
+    _frameRateChannel.invokeMethod('clearRefreshRate');
+
+    _scrollController.removeListener(_updateProgress);
+    _scrollController.dispose();
+    _breathController.dispose();
+    super.dispose();
+  }
+
+  // ---------- 方法 ----------
+  void _updateProgress() {
+    if (!_scrollController.hasClients) return;
+    final maxScroll = _scrollController.position.maxScrollExtent;
+    final currentScroll = _scrollController.position.pixels;
+    final progress = maxScroll > 0 ? currentScroll / maxScroll : 0.0;
+    setState(() {
+      _scrollProgress = progress;
+    });
   }
 
   Future<void> _loadChangelog() async {
@@ -26,6 +97,7 @@ class _ChangelogPageState extends State<ChangelogPage> {
       setState(() {
         _markdownContent = content;
         _isLoading = false;
+        _cachedMarkdown = _buildMarkdown(content);
       });
     } catch (e) {
       setState(() {
@@ -35,8 +107,56 @@ class _ChangelogPageState extends State<ChangelogPage> {
     }
   }
 
+  Widget _buildMarkdown(String content) {
+    return Markdown(
+      data: content,
+      shrinkWrap: true,
+      physics: const NeverScrollableScrollPhysics(),
+      styleSheet: MarkdownStyleSheet(
+        h1: const TextStyle(
+          fontFamily: 'HarmonyOS_Sans_SC',
+          fontSize: 24,
+          fontWeight: FontWeight.w700,
+          color: Colors.black,
+        ),
+        h2: const TextStyle(
+          fontFamily: 'HarmonyOS_Sans_SC',
+          fontSize: 20,
+          fontWeight: FontWeight.w600,
+          color: Colors.black87,
+        ),
+        h3: const TextStyle(
+          fontFamily: 'HarmonyOS_Sans_SC',
+          fontSize: 18,
+          fontWeight: FontWeight.w600,
+          color: Colors.black87,
+        ),
+        p: const TextStyle(
+          fontFamily: 'HarmonyOS_Sans_SC',
+          fontSize: 16,
+          color: Colors.black87,
+        ),
+        listBullet: const TextStyle(
+          fontFamily: 'HarmonyOS_Sans_SC',
+          fontSize: 16,
+          color: Colors.black87,
+        ),
+        code: const TextStyle(
+          fontFamily: 'HarmonyOS_Sans_SC',
+          fontSize: 14,
+          color: Colors.black87,
+          backgroundColor: Color(0xFFF5F5F5),
+        ),
+      ),
+    );
+  }
+
+  // ---------- Build ----------
   @override
   Widget build(BuildContext context) {
+    final breathOffset = _isScrolling ? _breathAnimation.value : 0.0;
+    final displayProgress = (_scrollProgress + breathOffset).clamp(0.0, 1.0);
+
     return Scaffold(
       backgroundColor: Colors.white,
       appBar: AppBar(
@@ -51,6 +171,17 @@ class _ChangelogPageState extends State<ChangelogPage> {
         elevation: 0,
         foregroundColor: Colors.black,
         iconTheme: const IconThemeData(color: Colors.black),
+        bottom: PreferredSize(
+          preferredSize: const Size.fromHeight(2.0),
+          child: LinearProgressIndicator(
+            value: displayProgress,
+            backgroundColor: Colors.grey.shade200,
+            valueColor: const AlwaysStoppedAnimation<Color>(
+              Color.fromRGBO(157, 212, 237, 1.0),
+            ),
+            minHeight: 2.0,
+          ),
+        ),
       ),
       body: _isLoading
           ? const Center(child: CircularProgressIndicator())
@@ -65,36 +196,9 @@ class _ChangelogPageState extends State<ChangelogPage> {
               ),
             )
           : SingleChildScrollView(
+              controller: _scrollController,
               padding: const EdgeInsets.all(16.0),
-              child: Markdown(
-                data: _markdownContent,
-                shrinkWrap: true,
-                physics: const NeverScrollableScrollPhysics(),
-                styleSheet: MarkdownStyleSheet(
-                  h1: const TextStyle(
-                    fontFamily: 'HarmonyOS_Sans_SC',
-                    fontSize: 24,
-                    fontWeight: FontWeight.w700,
-                    color: Colors.black,
-                  ),
-                  h2: const TextStyle(
-                    fontFamily: 'HarmonyOS_Sans_SC',
-                    fontSize: 20,
-                    fontWeight: FontWeight.w600,
-                    color: Colors.black87,
-                  ),
-                  p: const TextStyle(
-                    fontFamily: 'HarmonyOS_Sans_SC',
-                    fontSize: 16,
-                    color: Colors.black87,
-                  ),
-                  listBullet: const TextStyle(
-                    fontFamily: 'HarmonyOS_Sans_SC',
-                    fontSize: 16,
-                    color: Colors.black87,
-                  ),
-                ),
-              ),
+              child: _cachedMarkdown ?? const SizedBox.shrink(),
             ),
     );
   }