dart - Flutter Web iFrame weird behavior

Question

My Project was working totally fine a month ago, and now after several flutter updates, my iFrame widget is false centered in its desired renderbox. First picture is the wrong behavior, second is the old working version. I'm using a plugin which prevents the analyzer from prompting errors when using platformViewRegistry. Below is my code for the iframe-widget. Does someone know how to fix this? I don't want to downgrade to older flutter versions. Thanks for any help!

PS: Simple Center() did not work

My IFrame Widget

// ignore: avoid_web_libraries_in_flutter
import 'dart:html';
// ignore: undefined_prefixed_name
import 'package:universal_ui/universal_ui.dart';

import 'package:flutter/material.dart';

class Iframe extends StatefulWidget {
  final String source;
  final Size size;
  Iframe(this.source, {this.size});
  @override
  _IframeState createState() => _IframeState();
}

class _IframeState extends State<Iframe> {
  Widget _iframeWidget;
  String source;
  @override
  void initState() {
    newFrame();
    super.initState();
  }

  void newFrame() async {
    print(widget.size);
    final String id = widget.source.hashCode.toString();
    final IFrameElement _iframeElement = IFrameElement();
    _iframeElement.height = widget.size?.height?.toString() ?? '500';
    _iframeElement.width = widget.size?.width?.toString() ?? '500';
    source = widget.source;
    _iframeElement.src = widget.source;
    _iframeElement.style.border = 'none';

    ui.platformViewRegistry
        .registerViewFactory(id, (int viewID) => _iframeElement);
    _iframeWidget = HtmlElementView(
      key: UniqueKey(),
      viewType: id,
    );
  }

  @override
  Widget build(BuildContext context) {
    if (source != widget.source) newFrame();
    return _iframeWidget;
  }
}

Using IFrame Widget

class ChatClientAnon extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamCacheBuilder<Package>(
      stream: Database().streamPackage(),
      builder: (data) => Container(
        child: Row(
          children: [
            Expanded(child: SmartphoneClient('Anonym', isAnon: true), flex: 2),
            Expanded(
                child: LayoutBuilder(
                    builder: (_, c) =>
                        Iframe(data.source, size: c.biggest)),
                flex: 8),
          ],
        ),
      ),
    );
  }
}

question from:https://stackoverflow.com/questions/65869727/flutter-web-iframe-weird-behavior

Answer 1

Waitting for answers