title: Flutter: combining SliverAppbar with Column widget
body: <p>I'm trying to make an event page for an app where user can view events that have a banner image and some other useful information. I really like the idea of implementing a SliverAppBar with the banner, so that the user can scroll to see more information. For this I seem to need a CustomScrollView with a SliverAppBar and FlexibleSpaceBar.</p>
  <p>All tutorials I have seen online assume that the rest of the screen should be a list of sorts, but I rather want something like a Column widget. A Column has unbounded height, however, which causes overflow errors in the CustomScrollView. I could wrap it in a Container with specified height, but the contents of the body are of variable size, so that is not ideal. Is there a way to have a SliverAppBar and a Column work side by side?</p>
  <p>I want something along the lines of this:</p>
  <pre><code>class ActivityPage extends StatelessWidget {
  
    @override
    Widget build(BuildContext context) {
      return Scaffold(
        body: CustomScrollView(slivers: [
            SliverAppBar(
              flexibleSpace: FlexibleSpaceBar(
                background: Image(someImage),
              ),
              expandedHeight: Image,
              floating: false,
              pinned: true,
              snap: false,
            ),
            Column(
              children: [
                someChildren,
              ]
              ),
            )
          ]),
        ),
      );
    }
  </code></pre>
  <p>It should be possible, because it seems to me a somewhat common pattern, but I have looked around a lot and I can only find examples where the body consists of lists...</p>