在页脚中使用listview创建列表视图

Question

我正在尝试使用this question中定义的自定义SliverFooter添加ListView，这会创建RenderSliverFooter以在ListView中创建始终位于的{00}屏幕底部就像https://i.stack.imgur.com/hE8Tn.png处的设计一样。

class SliverFooter extends SingleChildRenderObjectWidget {
  /// Creates a sliver that fills the remaining space in the viewport.
  const SliverFooter({
    Key key,
    Widget child,
  }) : super(key: key, child: child);

  @override
  RenderSliverFooter createRenderObject(BuildContext context) => new RenderSliverFooter();
}

class RenderSliverFooter extends RenderSliverSingleBoxAdapter {
  /// Creates a [RenderSliver] that wraps a [RenderBox] which is sized to fit
  /// the remaining space in the viewport.
  RenderSliverFooter({
    RenderBox child,
  }) : super(child: child);

  @override
  void performLayout() {
    final extent = constraints.remainingPaintExtent - math.min(constraints.overlap, 0.0);
    var childGrowthSize = .0; // added
    if (child != null) {
       // changed maxExtent from 'extent' to double.infinity
      child.layout(constraints.asBoxConstraints(minExtent: extent, maxExtent: double.infinity), parentUsesSize: true);
      childGrowthSize = constraints.axis == Axis.vertical ? child.size.height : child.size.width; // added
    }
    final paintedChildSize = calculatePaintOffset(constraints, from: 0.0, to: extent);
    assert(paintedChildSize.isFinite);
    assert(paintedChildSize >= 0.0);
    geometry = new SliverGeometry(
      // used to be this : scrollExtent: constraints.viewportMainAxisExtent,
      scrollExtent: math.max(extent, childGrowthSize),
      paintExtent: paintedChildSize,
      maxPaintExtent: paintedChildSize,
      hasVisualOverflow: extent > constraints.remainingPaintExtent || constraints.scrollOffset > 0.0,
    );
    if (child != null) {
      setChildParentData(child, constraints, geometry);
    }
  }
}

如答案中所述，您可以使用SliverFooter，如下所示：

new CustomScrollView(
  slivers: <Widget>[
    new SliverFixedExtentList(
      itemExtent: 42.0,
      delegate: new SliverChildBuilderDelegate((context, index) {
        return new SizedBox.expand(
          child: new Card(),
        );
      }, childCount: 42),
    ),
    new SliverFooter(
      child: new Align(
        alignment: Alignment.bottomCenter,
        child: new Container(
          height: 42.0,
          color: Colors.red,
        ),
      ),
    ),
  ],
),

问题是在尝试向ListView添加SliverFooter时出现此错误：A RenderSliverFooter expected a child of type RenderBox but received a child of type RenderSliverList。

是否有另一种创建SliverFooter的方法，以便我可以在页脚中显示另一个ListView？目前的方式只能显示固定的高度。