Flutter ScrollController finout max offset

Question

I would like to make some kind of custom scroll progress indicator for CustomScrollView.

_scrollController = ScrollController()..addListener(_scroll);

void _scroll() {
    print('scrolled ${_scrollController.offset} from {??}');
}

Is there way to findout _scrollController max offset?

Or could I get some value form Scrollbar widget?

Answer 1

So all you need is

scrollController.position.maxScrollExtent

This gives you the max scroll extent for the ListView