如何在具有颤动的可滚动视图中使用具有可变高度内容的TabView？

Question

我有一个TabBar和TabBarView嵌套在Block。这是因为TabBarView内部的内容是动态的，并且直到运行时才知道内容的高度。

我无法将Block嵌套在TabBarView中，因为TabBar之前的内容应该与TabBarView内容一起滚动。

图：

码：

new DefaultTabController(
  length: 3,
  child: new Block(
    children: [
      new Container(
        height: 200.0,
        decoration: new BoxDecoration(
          backgroundColor: Colors.blue[500],
        ),
      ),
      new TabBar(
        tabs: <Widget>[
          new Tab(text: '1'),
          new Tab(text: '2'),
          new Tab(text: '3'),
        ],
      ),
      new TabBarView(
        children: [
          new Text('one'),
          new Text('two'),
          new Text('three'),
        ],
      ),
    ],
  )
);

但是，TabBarView的视口不受约束，需要具有有界高度约束的祖先窗口小部件。不幸的是，Block不具有有界高度，因为它具有可滚动性。

运行布局时收到此错误：

══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY    ╞═════════════════════════════════════════════════════════
I/flutter (28715): The following assertion was thrown during   performLayout():
I/flutter (28715): RenderList object was given an infinite size during layout.
I/flutter (28715): This probably means that it is a render object that tries to be as big as possible, but it was put
I/flutter (28715): inside another render object that allows its children to pick their own size.
I/flutter (28715): The nearest ancestor providing an unbounded height constraint is: ...

关于如何最好地接近这个的任何想法？

Answer 1

通过当前作为https://github.com/flutter/flutter/projects/3的一部分登陆的重构滚动“sliver”代码，这将变得非常容易。

SliverList https://docs.flutter.io/flutter/widgets/SliverList-class.html旨在实现这种组合，并且应该在大约两周内准备好一般使用。