修复处理内容包括公告 WebView、文件预览页、分享页兜底获取下载链接的隐藏 WebView。

lib/presentation/widgets/announcement_dialog.dart

@@ -1,7 +1,13 @@
 import 'dart:convert';
+import 'dart:io';
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:webview_flutter/webview_flutter.dart';
+import 'package:flutter_inappwebview/flutter_inappwebview.dart' as desktop;
+import 'package:webview_flutter/webview_flutter.dart' as mobile;
+
+bool get _useDesktopWebView =>
+    !kIsWeb && (Platform.isWindows || Platform.isLinux);
 
 class AnnouncementDialog extends StatefulWidget {
   final String title;
@@ -26,11 +32,8 @@ class AnnouncementDialog extends StatefulWidget {
     await showDialog<void>(
       context: context,
       barrierDismissible: true,
-      builder: (_) => AnnouncementDialog(
-        title: title,
-        html: html,
-        baseUrl: baseUrl,
-      ),
+      builder: (_) =>
+          AnnouncementDialog(title: title, html: html, baseUrl: baseUrl),
     );
   }
 
@@ -39,35 +42,39 @@ class AnnouncementDialog extends StatefulWidget {
 }
 
 class _AnnouncementDialogState extends State<AnnouncementDialog> {
-  late final WebViewController _controller;
+  mobile.WebViewController? _mobileController;
+  desktop.InAppWebViewController? _desktopController;
+  late final String _html;
+  late final String _baseUrl;
   bool _loading = true;
 
   @override
   void initState() {
     super.initState();
 
-    _controller = WebViewController()
-      ..setJavaScriptMode(JavaScriptMode.unrestricted)
-      ..setBackgroundColor(Colors.transparent)
-      ..setNavigationDelegate(
-        NavigationDelegate(
-          onPageFinished: (_) {
-            if (mounted) setState(() => _loading = false);
-          },
-        ),
-      );
+    final origin = Uri.parse(widget.baseUrl).origin;
+    _html = _wrapHtml(widget.html);
+    _baseUrl = '$origin/';
 
-    _load();
+    if (!_useDesktopWebView) {
+      _mobileController = mobile.WebViewController()
+        ..setJavaScriptMode(mobile.JavaScriptMode.unrestricted)
+        ..setBackgroundColor(Colors.transparent)
+        ..setNavigationDelegate(
+          mobile.NavigationDelegate(
+            onPageFinished: (_) {
+              if (mounted) setState(() => _loading = false);
+            },
+          ),
+        )
+        ..loadHtmlString(_html, baseUrl: _baseUrl);
+    }
   }
 
-  Future<void> _load() async {
-    final origin = Uri.parse(widget.baseUrl).origin;
-    final html = _wrapHtml(widget.html);
-
-    await _controller.loadHtmlString(
-      html,
-      baseUrl: '$origin/',
-    );
+  @override
+  void dispose() {
+    _desktopController?.dispose();
+    super.dispose();
   }
 
   String _wrapHtml(String body) {
@@ -162,7 +169,7 @@ $body
               Expanded(
                 child: Stack(
                   children: [
-                    WebViewWidget(controller: _controller),
+                    _buildWebView(),
                     if (_loading)
                       const Center(child: CircularProgressIndicator()),
                   ],
@@ -174,4 +181,29 @@ $body
       ),
     );
   }
+
+  Widget _buildWebView() {
+    if (_useDesktopWebView) {
+      return desktop.InAppWebView(
+        initialData: desktop.InAppWebViewInitialData(
+          data: _html,
+          baseUrl: desktop.WebUri(_baseUrl),
+        ),
+        initialSettings: desktop.InAppWebViewSettings(
+          javaScriptEnabled: true,
+          domStorageEnabled: true,
+          transparentBackground: true,
+          supportZoom: false,
+        ),
+        onWebViewCreated: (controller) {
+          _desktopController = controller;
+        },
+        onLoadStop: (_, url) {
+          if (mounted) setState(() => _loading = false);
+        },
+      );
+    }
+
+    return mobile.WebViewWidget(controller: _mobileController!);
+  }
 }