Dart 带省道的颤振中的可滚动列表视图

有人能告诉我应该在哪里定义滚动控制器吗？我有聊天列表视图，它是可滚动视图的主体。我希望能够从

MainView

控制滚动行为，但不知道如何将控制器传递到

\u ChatListView

。有什么想法吗

mainview.dart

class MainView extends StatelessWidget {
    ...
    // is this the correct place?
    final ScrollController scrollController = ScrollController();

    @override
    Widget build(BuildContext context) {
        return new Scaffold(
            body: new ChatListView()
        );
    }
}

class ChatListView extends StatefulWidget {
    @override
    _ChatListView createState() => _ChatListView();
}

class _ChatListView extends State< ChatListView > {
    Widget build(BuildContext context) {
        return ListView.builder(
          controller: scrollController,
          );
    }
}

chatlistview.dart

class MainView extends StatelessWidget {
    ...
    // is this the correct place?
    final ScrollController scrollController = ScrollController();

    @override
    Widget build(BuildContext context) {
        return new Scaffold(
            body: new ChatListView()
        );
    }
}

class ChatListView extends StatefulWidget {
    @override
    _ChatListView createState() => _ChatListView();
}

class _ChatListView extends State< ChatListView > {
    Widget build(BuildContext context) {
        return ListView.builder(
          controller: scrollController,
          );
    }
}

类ChatListView扩展StatefulWidget{
@凌驾
_ChatListView createState（）=>\u ChatListView（）；
}
类\u ChatListView扩展状态{
小部件构建（构建上下文）{
返回ListView.builder(
控制器：滚动控制器，
);
}
}

添加构造函数并将控制器作为参数传递

class MainView extends StatelessWidget {
    ...
    // is this the correct place?
    final ScrollController scrollController = ScrollController();

    @override
    Widget build(BuildContext context) {
        return new Scaffold(
            body: new ChatListView(scrollController: scrollController)
        );
    }
}

class\u ChatListView扩展状态{
小部件构建（构建上下文）{
返回ListView.builder(
控制器：widget.scrollController，
);
}
}

太完美了，

小部件

对象终于是我想要的了！谢谢