小部件手势操作不适用于在颤动网络中堆积在Htmlview上的小部件

Question

我在FlutterWeb中的HtmlView上堆叠了一些小部件，但是发现没有任何动作可用于放置在HtmlView上的小部件。 HtmlView消耗所有动作。根据Flutter文档，仅当其他小部件都不要求事件时，平台视图才应获取事件。

请参阅下面的最小复制代码。我尝试将ModalBottomSheet，SnackBar和Flatbutton放在HtmlView上，以显示youTube视频和Google地图。这些都不起作用。

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:html';
import 'package:flutter_web_ui/ui.dart' as ui;
import 'package:flutter_web/material.dart';

void main() {
  runApp(new Center(child: new Directionality( textDirection: TextDirection.ltr,child:HtmlExample())));
}

class HtmlExample extends StatefulWidget {
  @override
  _HtmlExampleState createState() => new _HtmlExampleState();
}

class _HtmlExampleState extends State<HtmlExample> {
int count;
  @override
  void initState() {
    count = 0;
    ui.platformViewRegistry.registerViewFactory(
        'hello-world-html',
            (int viewId) => IFrameElement()
          ..width = '640'
          ..height = '360'
          ..src = 'https://www.youtube.com/embed/IyFZznAk69U'
          ..style.border = 'none');
    super.initState();
    // We use 3600 milliseconds instead of 1800 milliseconds because 0.0 -> 1.0
    // represents an entire turn of the square whereas in the other examples
    // we used 0.0 -> math.pi, which is only half a turn.
  }

  @override
  Widget build(BuildContext context) {
    return Stack(children: <Widget>[
      SizedBox(
      width: 640,
      height: 360,
      child:  HtmlView(viewType: 'hello-world-html')), //Text("Count = $count")),
      Text("Count = $count"),
      Column (children: <Widget>[
        FlatButton(child: Text("Count"), color: Colors.red, onPressed: () => setState((){count++;})),
        Text("Count = $count"),
      ],)
    ],);
  }

  @override
  void dispose() {
    super.dispose();
  }
}