Drag bug with CustomScrollView and CupertinoSliverRefreshControl

[sylvestrevgen]

When use CustomScrollView, SliverList and CupertinoSliverRefreshControl inside CupertinoScaffold.showCupertinoModalBottomSheet, when drag list down to refresh list with sliver refresh control, modal bottom sheet also is dragging down. How can I fix this problem? I temporarily add enableDrag: false, but it would be great if drag will work correct.

[sylvestrevgen]

Or if maybe remove drag on list, but keep drag ability to close modal bottom sheet on drag navigation bar inside modal bottom sheet. I use CupertinoPageScaffold inside modal bottom sheet. Maybe I can wrap CupertinoPageScaffold body with specified widget for this, I don't know(

[skorodumoviktor]

Same with showMaterialModalBottomSheet with SingleChildScrollView inside the body.

Sample code to reproduce the issue:

Widget modalBuilder(BuildContext context) { return FractionallySizedBox( heightFactor: 0.9, child: Container( color: Colors.cyanAccent, padding: const EdgeInsets.only(left: 20, top: 20, right: 20), child: SingleChildScrollView( controller: ModalScrollController.of(context), child: Container( color: Colors.amberAccent, height: 1000, width: double.infinity, child: const SizedBox(), )), ), ); }

class ModalExample extends StatelessWidget { const ModalExample({Key? key}) : super(key: key);

@override Widget build(BuildContext context) { return ElevatedButton( onPressed: () { showMaterialModalBottomSheet( context: context, backgroundColor: Colors.transparent, builder: modalBuilder); }, child: const Text('Open modal')); } }

Result: When dragging down by yellow area the area itself moving down faster than the modal:

https://user-images.githubusercontent.com/57828790/174599568-78f44fb9-bfe9-4638-95ec-cfc7cce54946.mov

Expected result: When dragging down by yellow area it is similar with the dragging down by blue area

[ubestudio]

@sylvestrevgen @skorodumoviktor You need to add physics:ClampingScrollPhysics() to your CustomScrollView.

return CustomScrollView(
        controller: ModalScrollController.of(context),
        /// Creates scroll physics that prevent the scroll offset from exceeding the bounds of the content.
        physics: ClampingScrollPhysics(),     // <- add this here
        slivers: [],
);

[bohowu]

I add physics:ClampingScrollPhysics() to GridView but still not work.

Old version seems not have the problem. Hope the showCupertinoModalBottomSheet won't be scroll when we scroll the inner widget. Thanks.

[princ3od]

Confirm downgrading to v2.1.0 solves this issue.