Disable drag down to close showModalBottomSheet

Question

How do I disable / escape drag down gesture within the Bottom Sheet Modal so the user can interact within the modal without accidentally closing the modal?

Updated below with the actual modal bottom sheet.

return showModalBottomSheet(
    context: context,
    builder: (BuildContext context) {
        ...
    }
}

Solution 1

Set enableDrag to false

bool enableDrag

If true, the bottom sheet can dragged up and down and dismissed by swiping downwards.

https://docs.flutter.io/flutter/material/BottomSheet/enableDrag.html

Solution 2

you can try to wrap builder's result with GestureDetector with onVerticalDragStart = (_) {}

showModalBottomSheet(
  context: context,
  builder: (context) => GestureDetector(
    child: **any_widget_here**,
    onVerticalDragStart: (_) {},
  ),
  isDismissible: false,
  isScrollControlled: true,
);

Solution 3

If you still want to have the scroll inside the modal without the user drag and close it, you can use this:

                  showModalBottomSheet(
                    context: context,
                    enableDrag: false,
                    shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.vertical(
                        top: Radius.circular(20),
                      ),
                    ),
                    clipBehavior: Clip.antiAliasWithSaveLayer,
                    builder: (context) => DraggableScrollableSheet(
                      expand: false,
                      initialChildSize: 0.9,
                      minChildSize: 0.5,
                      maxChildSize: 0.9,
                      builder: (context, scrollController) {
                        return SingleChildScrollView(
                          child: new Container(
                            color: Colors.white,
                            child: buildTitleWidget(),
                          ),
                        );
                      },
                    ),
                    isDismissible: false,
                    isScrollControlled: true,
                  );

The trick is not to add scrollController to the SingleChildScrollView

                      builder: (context, scrollController) {
                        return SingleChildScrollView(
                          controller: scrollController            <-- HERE
                          child: new Container(
                            color: Colors.white,
                            child: buildTitleWidget(),
                          ),
                        );
                      },