Flutter :如何在webview中屏蔽全屏视频？

import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';

class WebViewScreen extends StatefulWidget {
  @override
  _WebViewScreenState createState() => _WebViewScreenState();
}

class _WebViewScreenState extends State<WebViewScreen> {
  final Completer<WebViewController> _controller =
      Completer<WebViewController>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('WebView'),
      ),
      body: WebView(
        initialUrl: 'https://example.com',
        javascriptMode: JavascriptMode.unrestricted,
        onWebViewCreated: (WebViewController webViewController) {
          _controller.complete(webViewController);
        },
        onPageFinished: (String url) {
          _controller.future.then((WebViewController controller) {
            controller.evaluateJavascript('''
              // 在这里执行JavaScript代码来拦截全屏视频
              // 例如禁止全屏按钮的点击
              document.querySelector('video').controls = true;
            ''');
          });
        },
      ),
    );
  }
}