禁用Flutter WebView的长按

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

class DisableLongPressWebView extends StatefulWidget {
  @override
  _DisableLongPressWebViewState createState() => _DisableLongPressWebViewState();
}

class _DisableLongPressWebViewState extends State<DisableLongPressWebView> {
  final Completer<WebViewController> _controller = Completer<WebViewController>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Disable Long Press WebView'),
      ),
      body: WebView(
        initialUrl: 'https://example.com',
        javascriptMode: JavascriptMode.unrestricted,
        onWebViewCreated: (WebViewController webViewController) {
          _controller.complete(webViewController);
          _disableLongPress(webViewController);
        },
      ),
    );
  }

  void _disableLongPress(WebViewController webViewController) async {
    final String script = '''
      document.body.addEventListener('touchstart', function(event) {
        event.preventDefault();
      });
      document.body.style.userSelect = 'none';
      document.body.style.webkitUserSelect = 'none';
    ''';
    await webViewController.loadUrl(Uri.dataFromString(script, mimeType: 'text/javascript').toString());
  }
}