Feature Request for SliverBottomAppBar

[ghost]

Problem:
When using SlideTransition to slide off BottomAppBar on SliverList scroll which is inside NestedScrollView with SliverAppBar, animation works, but SliverList does not occupy remaining space where BottomAppBar once was.

Intended behaviour:
https://material.io/design/components/app-bars-bottom.html#behavior ("Scrolling" paragraph)

Examples:
How it looks when SlideTransition finishes and BottomAppBar is no longer visible:

"Hack":
To archive intended effect I use SizeTransition instead of SlideTransition with axis: Axis.vertical and axisAlignment: -1.0 , but that for some reason removes BottomAppBar elevation and FAB moves down when BottomAppBar changes size.

Feature request:
There could be a SliverBottomAppBar Widget with floating/snap/pinned properties and it could react to scrolling of CustomScrollView same as SliverAppBar does.

[rakeshlanjewar]

I have answered a workaround on this :-

https://stackoverflow.com/a/54567061/7416454

[ninest]

@Achilas
Do you mind providing a working example of your code of how you implemented this?

[sergioahv15]

@Achilas
I would appreciate a working example too. Thanks!

[ghost]

There is no working example. I gave up with this feature as soon as I posted this.

[changalberto]

This request has been made like 2 years ago, and it still hasn't been implemented?

[MustafaAdam]

This would be a great widget to add. I don't see why it wasn't added to Flutter by now.
I would appreciate any update from the Flutter team or at least confirmation that they aren't working on it at all.

[kaijauk]

Same here, would also need this!
I want a widget that is not expanded until I reach the end of my CustomScrollView with Sliver Widgets

[guidezpl]

M3 keeps the concept of bottom app bar scrolling but will add more complex interactions (e.g. with FAB). As such I'll take this as a feature request for M3

[hgraceb]

Why is it still just a proposal after five years?