部分可见的底部工作表 - 颤动

在颤振中是否可以在初始状态下部分查看底部工作表，然后能够展开/关闭？

我提供了 Google 地图实现的示例的屏幕截图。

Use the DraggableScrollableSheet小部件与Stack widget:

这是gist https://gist.github.com/rohan20/869492358cbb15311538f069a0c749af对于此^ GIF 中的整个页面，或尝试Codepen https://codepen.io/rohantaneja/pen/JjYgPzm.

整个页面的结构如下：

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        children: <Widget>[
          CustomGoogleMap(),
          CustomHeader(),
          DraggableScrollableSheet(
            initialChildSize: 0.30,
            minChildSize: 0.15,
            builder: (BuildContext context, ScrollController scrollController) {
              return SingleChildScrollView(
                controller: scrollController,
                child: CustomScrollViewContent(),
              );
            },
          ),
        ],
      ),
    );
  }

In the Stack:
- 谷歌地图是最下层。
- 标题（搜索字段+水平滚动条）位于地图上方。
- DraggableBottomSheet 位于标题上方。

一些有用的参数定义在draggable_scrollable_sheet.dart:

  /// The initial fractional value of the parent container's height to use when
  /// displaying the widget.
  ///
  /// The default value is `0.5`.
  final double initialChildSize;

  /// The minimum fractional value of the parent container's height to use when
  /// displaying the widget.
  ///
  /// The default value is `0.25`.
  final double minChildSize;

  /// The maximum fractional value of the parent container's height to use when
  /// displaying the widget.
  ///
  /// The default value is `1.0`.
  final double maxChildSize;

编辑：谢谢@亚历杭德罗 https://stackoverflow.com/questions/52403709/partially-viewable-bottom-sheet-flutter/62089808?noredirect=1#comment121601194_62089808用于指出小部件名称中的拼写错误:)