Flutter - How scroll to SliverPersistentHeader position?

Question

CustomScrollView(
     SliverToBoxAdapter(), // firstBox
     SliverPersistentHeader(pinned:true),
     SliverToBoxAdapter(), // secondBox
)

I have a button on this page, when I click this button, how let SliverPersistentHeader scroll to top programmatically?
Addition: firstBox's height is uncertain.

Answer 1

Initalize a GlobalKey in that widget.

    final GlobalKey globalKey = GlobalKey();

Then pass it to the widget you want to scroll to:

  CustomScrollView(
   slivers: [
     SliverToBoxAdapter(), // firstBox
     SliverPersistentHeader(pinned: true, delegate: null,),
     SliverToBoxAdapter(
       key: globalKey,
     ),
   ],
 )

Then the button onPressed should be like this:

  onPressed: () {
            Scrollable.ensureVisible(
            globalKey.currentContext!,
            duration: const Duration(seconds: 1),
            );
        },