更改CustomScrollView的glov位置

Question

我正在尝试改变滚动glov的位置，从顶部到底部的appBar内部的CustomScrollView。根据官方文档中的示例，我可以使用NotificationListener。但是当我尝试在我的代码中实现它时，notification.paintOffset没有定义。我应该怎么做，下面是我的代码：

class HomeView extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: _buildContent(context),
    );
  }

 Widget _buildContent(BuildContext context) {
  double leadingPaintOffset = MediaQuery.of(context).padding.top + AppBar().preferredSize.height;
  return NotificationListener<OverscrollIndicatorNotification>(
    onNotification: (notification) {
      if (notification.leading) {
        notification.paintOffset = leadingPaintOffset;
      }
      return false;
    },
    child: CustomScrollView(
      slivers: [
        SliverAppBar(title: Text('Custom PaintOffset')),
        SliverToBoxAdapter(
          child: Container(
            color: Colors.amberAccent,
            height: 100,
            child: Center(child: Text('Glow all day!')),
          ),
        ),
        SliverFillRemaining(child: FlutterLogo()),
      ],
    ),
  );

}
}

下面是一个例外：

The setter 'paintOffset' isn't defined for the class 'OverscrollIndicatorNotification'.
Try importing the library that defines 'paintOffset', correcting the name to the name of an existing setter, or defining a setter or field named 'paintOffset'.

所以，notification.paintOffset没有定义！求求你救命！这是官方文档的链接：https://api.flutter.dev/flutter/widgets/GlowingOverscrollIndicator-class.html

下面是Flutter doctor的输出：

√] Flutter (Channel stable, v1.12.13+hotfix.8, ...)
 
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[!] Android Studio (version 3.5)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
[√] VS Code (version 1.47.3)
[!] Connected device
    ! No devices available

! Doctor found issues in 2 categories.

​

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谢谢!

Answer 1

3个月前在this commit中引入了paintOffset

您将不会在以前的flutter版本(如您的v1.12.13)中找到它的定义。尝试将flutter升级到至少1.17.1，因为它是在2020年5月13日合并的