What is the name for Flutter’s sliver-like behaviors?

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?