fix web and multi platform adaptation

lib/common.dart

@@ -9,6 +9,7 @@ var isIOS = false;
 var isWeb = false;
 var isDesktop = false;
 var version = "";
+int androidVersion = 0;
 
 typedef F = String Function(String);
 typedef FMethod = String Function(String, dynamic);

lib/main.dart

@@ -18,20 +18,26 @@ Future<Null> main() async {
 }
 
 class App extends StatelessWidget {
-
   @override
   Widget build(BuildContext context) {
     final analytics = FirebaseAnalytics();
-    return MultiProvider(
-      providers: [
-        ChangeNotifierProvider.value(value: FFI.ffiModel),
-        ChangeNotifierProvider.value(value: FFI.imageModel),
-        ChangeNotifierProvider.value(value: FFI.cursorModel),
-        ChangeNotifierProvider.value(value: FFI.canvasModel),
-        ChangeNotifierProvider.value(value: FFI.serverModel),
+    final providers = [
+      ChangeNotifierProvider.value(value: FFI.ffiModel),
+      ChangeNotifierProvider.value(value: FFI.imageModel),
+      ChangeNotifierProvider.value(value: FFI.cursorModel),
+      ChangeNotifierProvider.value(value: FFI.canvasModel),
+    ];
+    if (!isWeb) {
+      providers.addAll([
         ChangeNotifierProvider.value(value: FFI.chatModel),
         ChangeNotifierProvider.value(value: FFI.fileModel),
-      ],
+      ]);
+      if (isAndroid) {
+        providers.add(ChangeNotifierProvider.value(value: FFI.serverModel));
+      }
+    }
+    return MultiProvider(
+      providers: providers,
       child: MaterialApp(
         navigatorKey: globalKey,
         debugShowCheckedModeBanner: false,
@@ -40,7 +46,7 @@ class App extends StatelessWidget {
           primarySwatch: Colors.blue,
           visualDensity: VisualDensity.adaptivePlatformDensity,
         ),
-        home: HomePage(),
+        home: isWeb ? WebHomePage() : HomePage(),
         navigatorObservers: [
           FirebaseAnalyticsObserver(analytics: analytics),
         ],

lib/models/chat_model.dart

@@ -5,7 +5,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter_hbb/pages/chat_page.dart';
 
 import 'model.dart';
-import 'native_model.dart';
 
 class ChatModel with ChangeNotifier {
   // -1作为客户端模式的id，客户端模式下此id唯一
@@ -51,12 +50,12 @@ class ChatModel with ChangeNotifier {
     if (message.text != null && message.text!.isNotEmpty) {
       _messages[_currentID]?.add(message);
       if (_currentID == clientModeID) {
-        PlatformFFI.setByName("chat_client_mode", message.text!);
+        FFI.setByName("chat_client_mode", message.text!);
       } else {
         final msg = Map()
           ..["id"] = _currentID
           ..["text"] = message.text!;
-        PlatformFFI.setByName("chat_server_mode", jsonEncode(msg));
+        FFI.setByName("chat_server_mode", jsonEncode(msg));
       }
     }
     notifyListeners();

lib/models/native_model.dart

@@ -24,7 +24,6 @@ class PlatformFFI {
   static Pointer<RgbaFrame>? _lastRgbaFrame;
   static String _dir = '';
   static String _homeDir = '';
-  static int? _androidVersion;
   static F2? _getByName;
   static F3? _setByName;
   static F4? _freeRgba;
@@ -49,8 +48,6 @@ class PlatformFFI {
     return packageInfo.version;
   }
 
-  static int? get androidVersion => _androidVersion;
-
   static String getByName(String name, [String arg = '']) {
     if (_getByName == null) return '';
     var a = name.toNativeUtf8();
@@ -97,7 +94,7 @@ class PlatformFFI {
         AndroidDeviceInfo androidInfo = await deviceInfo.androidInfo;
         name = '${androidInfo.brand}-${androidInfo.model}';
         id = androidInfo.id.hashCode.toString();
-        _androidVersion = androidInfo.version.sdkInt;
+        androidVersion = androidInfo.version.sdkInt;
       } else {
         IosDeviceInfo iosInfo = await deviceInfo.iosInfo;
         name = iosInfo.utsname.machine;

lib/models/server_model.dart

@@ -1,7 +1,6 @@
 import 'dart:async';
 import 'dart:convert';
 import 'package:flutter/material.dart';
-import 'package:flutter_hbb/models/native_model.dart';
 import '../common.dart';
 import '../pages/server_page.dart';
 import 'model.dart';
@@ -71,7 +70,7 @@ class ServerModel with ChangeNotifier {
 
   toggleInput(){
     if(_inputOk){
-      PlatformFFI.invokeMethod("stop_input");
+      FFI.invokeMethod("stop_input");
     }else{
       showInputWarnAlert();
     }

lib/pages/home_page.dart

@@ -20,12 +20,20 @@ class HomePage extends StatefulWidget {
 
 class _HomePageState extends State<HomePage> {
   var _selectedIndex = 0;
-  final List<PageShape> _pages = [
-    ConnectionPage(),
-    chatPage,
-    ServerPage(),
-    SettingsPage()
-  ];
+  final List<PageShape> _pages = [];
+
+  @override
+  void initState() {
+    super.initState();
+    _pages.addAll([
+      ConnectionPage(),
+      chatPage,
+    ]);
+    if(isAndroid){
+      _pages.add(ServerPage());
+    }
+    _pages.add(SettingsPage());
+  }
 
   @override
   Widget build(BuildContext context) {
@@ -58,7 +66,7 @@ class _HomePageState extends State<HomePage> {
             unselectedItemColor: MyTheme.darkGray,
             onTap: (index) => setState(() {
               // close chat overlay when go chat page
-              if(index == 1 && _selectedIndex!=index){
+              if (index == 1 && _selectedIndex != index) {
                 hideChatIconOverlay();
                 hideChatWindowOverlay();
               }
@@ -69,3 +77,20 @@ class _HomePageState extends State<HomePage> {
         ));
   }
 }
+
+class WebHomePage extends StatelessWidget {
+  final connectionPage = ConnectionPage();
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      backgroundColor: MyTheme.grayBg,
+      appBar: AppBar(
+        centerTitle: true,
+        title: Text("RustDesk"),
+        actions: connectionPage.appBarActions,
+      ),
+      body: connectionPage,
+    );
+  }
+}

lib/pages/server_page.dart

@@ -3,7 +3,6 @@ import 'package:flutter_hbb/models/model.dart';
 import 'package:provider/provider.dart';
 
 import '../common.dart';
-import '../models/native_model.dart';
 import '../models/server_model.dart';
 import 'home_page.dart';
 import '../models/model.dart';
@@ -156,7 +155,6 @@ class _PermissionCheckerState extends State<PermissionChecker> {
   @override
   Widget build(BuildContext context) {
     final serverModel = Provider.of<ServerModel>(context);
-    final androidVersion = PlatformFFI.androidVersion ?? 0;
     final hasAudioPermission = androidVersion>=30;
     return PaddingCard(
         title: translate("Configuration Permissions"),