Prevent a NestedScrollView from scrolling

Question

I have a widget that is a NestedScrollView and some text in the body. There are cases where I want to "lock" the user and not allow him to scroll. I have tried using the physics property and set it to NeverScrollableScrollPhysics()as the docs seem to indicate this is what it is for: https://api.flutter.dev/flutter/widgets/NeverScrollableScrollPhysics-class.html however this does not seem to be working and the screen still scrolls.

Is there a way to prevent the scroll?

  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
        length: 2,
        child: NestedScrollView(
          physics: NeverScrollableScrollPhysics(),
          headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
            return <Widget>[
              SliverAppBar(
                expandedHeight: 150.0,
                floating: false,
                pinned: true,
                forceElevated: true,
                flexibleSpace: FlexibleSpaceBar(
                  centerTitle: true,
                  title: Text('I am a header'),
                ),
              )
            ];
          },
          body: Text(' I am scrolling'),
        ));
  }

Answer 1

There is a widget called AbsorbPointer. Wrap it around your NestedScrollView.

AbsorbPointer( 
   isAbsorbing: true,
   child: NestedScrollView(...))