Flutter - 下拉刷新在 Webview 中不起作用

Question

我只想在 webview 上添加“下拉刷新”功能。 我添加了 SmartRefresher 但它不起作用。 该包严格要求 SmartRefresher 的子项是 ListView，因此在这种情况下我必须使用 Listview。 我正在尝试刷新下拉刷新小部件的页面。 下面我附上了我正在尝试构建的小部件代码。

class CustomWebView extends StatefulWidget {
  @override
  _CustomWebViewState createState() => _CustomWebViewState();
}

WebViewController controllerGlobal;
bool connected = false;
Future<bool> _exitApp(BuildContext context) async {
  if (await controllerGlobal.canGoBack()) {
    print("onwill goback");
    controllerGlobal.goBack();
  } else {
    return Future.value(true);
  }
}

class _CustomWebViewState extends State<CustomWebView> {
  final Completer<WebViewController> _controller =
      Completer<WebViewController>();
  bool done = false;
  RefreshController _refreshController =
      RefreshController(initialRefresh: false);
  @override
  Widget build(BuildContext context) {
    double _width = MediaQuery.of(context).size.width;
    double _height = MediaQuery.of(context).size.height;

    FlutterStatusbarcolor.setStatusBarColor(Color(0xff3700b3));
    return WillPopScope(
      onWillPop: () => _exitApp(context),
      child: SafeArea(
        child: Scaffold(
          body: SmartRefresher(
            controller: _refreshController,
            scrollDirection: Axis.vertical,
            footer: SizedBox(),
            header: MaterialClassicHeader(
              color: Color(0xffec0928),
            ),
            onRefresh: () {
              controllerGlobal.reload();
              _refreshController.refreshCompleted();
            },
            child: ListView(
                shrinkWrap: true,
                physics: const NeverScrollableScrollPhysics(),
                children: <Widget>[
                  Container(
                    height: _height,
                    width: _width,
                    child: Stack(
                      children: [
                        FutureBuilder<WebViewController>(
                          future: _controller.future,
                          builder: (BuildContext context,
                              AsyncSnapshot<WebViewController> snapshot) {
                            final WebViewController controller = snapshot.data;
                            controllerGlobal = controller;
                            return Stack(
                              children: [
                                WebView(
                                  initialUrl: 'https://uzamart.com/',
                                  javascriptMode: JavascriptMode.unrestricted,
                                  onWebViewCreated:
                                      (WebViewController webviewController) {
                                    _controller.complete(webviewController);
                                  },
                                  onPageFinished: (String url) {
                                    if (url == 'https://uzamart.com/') {
                                      setState(() {
                                        done = true;
                                      });
                                    }
                                    print('Page finished loading: $url');
                                  },
                                  gestureNavigationEnabled: true,
                                ),
                                !done
                                    ? AlertDialog(
                                        shape: RoundedRectangleBorder(
                                          borderRadius: BorderRadius.all(
                                            Radius.circular(10.0),
                                          ),
                                        ),
                                        title: Row(
                                          children: <Widget>[
                                            CircularProgressIndicator(
                                              valueColor:
                                                  AlwaysStoppedAnimation<Color>(
                                                Color(0xffec0928),
                                              ),
                                            ),
                                            Padding(
                                              padding:
                                                  const EdgeInsets.fromLTRB(
                                                      18.0, 0, 0, 0),
                                              child: Text('Loading...'),
                                            )
                                          ],
                                        ),
                                      )
                                    : SizedBox()
                              ],
                            );
                          },
                        )
                     ]
                   )
                )
              ]
            )
          )
        )
      )
    );
  }
}