I'm looking for a component name that behaves like flutter's sliver:

Here is an example of sliver.

What i'm looking for exactly is a list that collapses or expands based on how much you dragged, pretty much like the behavior Android launchers have when you drag the app list, if it's >50% then it expands, else it collapses back to its minimised state.

What is the name of this kind of component/behavior?

  • Is it not “sliver”? :)
    – lynn
    May 14, 2020 at 20:30
  • @Lynn Sadly no, that's a specific named implementation for flutter.
    – Nick
    May 15, 2020 at 1:41
  • Auto shrink header on scroll or shrink header Jun 21, 2021 at 11:13

1 Answer 1


The ScrollPhysics provides Flutter's FlexibleSpaceBar class its stretch behavior.

A related concept (component) is overscroll-behavior as implemented by CSS, where you have a dialog box with scrolling content on top of a page of scrolling content. See also: "CSSWG - CSS Overscroll Behavior".

Once the dialog box's scroll boundary is reached, the underlying page will then start to scroll — this is called scroll chaining.

To customize the physics:

  • AndySham - scroll-custom - Overwrites native DOM scrolling with a customisable physics-based animation.

  • JulianShapiro - velocityJS - Accelerated JavaScript animation.

Rather than replace one large library with another to implement the physics it makes sense to use a simple parallax effect:

  • electerious - basicScroll - Standalone parallax scrolling for mobile and desktop with CSS variables.

With that code a smaller movement can be translated to a larger move that fully pulls down the AppBar.

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