Flutter onClosing callback for showModalBottomSheet

Question

I have a showModalBottomSheet like the below, which I understand to inherit from BottomSheet (right?)

      showModalBottomSheet

        

Answer 1

wrapper Container in WillPopScope widget

showModalBottomSheet(
        context: context,
        builder: (BuildContext context) {
          return WillPopScope(
            onWillPop: () aysnc{
              // listener dismiss
              return true;
            }
            child : Container(
              height: 260.0,
              child: Text('I am text')
            ));
        },
      );