title: Stop scrolling in DraggableScrollableSheet in flutter
body: <p>I would like to stop the inside of my DraggableScrollableSheet from scrolling while still being able to drag it up and down. Is there a way to do that? I've used a bottomSheet but they were unable to be dragged up and down.</p>
  <p>I'd like to stay away from third party code, so if there is a way to do it natively that would be amazing. Here's an example of what is currently happening:</p>
  <p><a href="https://i.stack.imgur.com/XiQbe.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XiQbe.gif" alt="enter image description here" /></a></p>
  <p>Here is my relevant code:</p>
  <pre><code>@override
  Widget build(BuildContext context) {
      return Scaffold(
          drawer: SettingsDrawer(username: _username),
          body: Stack(
              children: &lt;Widget&gt;[
                  MapWidget(),
                  MenuButton(),
                  DraggableScrollableSheet(
                      initialChildSize: 0.35,
                      minChildSize: 0.2,
                      maxChildSize: .35,
                      builder: (BuildContext context, ScrollController scrollController) {
                           return SingleChildScrollView(
                             controller: scrollController,
                             child: HelpSheet(),
                           );
                     },
                  )
              ]
          ),
      );
  }
  </code></pre>