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#compose
Title
# compose
j
Jason Ankers
03/09/2021, 4:46 AMIs it possible to opt a
LazyColumnm
matvei
03/09/2021, 1:02 PMCan you please share a use case where you would want this? We explicitly made a decision to include nested scroll by default with no opt-out capabilities, so the contract is always consistent when you don't know your children / parent.
j
Jason Ankers
03/09/2021, 2:35 PMSure, our UI requires that we have scrollable pickers inside a list of items. The entire page is also a full-screen bottom sheet. Scrolling the pickers causes the whole list to shuffle around, and also scrolls the whole bottom sheet. I’ve attached videos of compose vs our production app. Scrolling the pickers in production does not cause anything else to scroll:
(First video is compose, second video is existing functionality)
I think it’s good UX that scrolling can chain up to parent containers, but I don’t know if it should always happen in the same gesture. For example, take a look at how the Shazam iOS app handles this: scrolling the content inside the list does not close the bottom sheet once we reach the top. A second scroll gesture if the list is already scrolled to the top will close it
Until we’re able to do something like that I think we probably need some opt-out capability
m
matvei
03/09/2021, 4:25 PMSo you'r picker is also a LazyColumn?
If so, you can pass a
Modifier.nestedScrollonPostScrollonPostFlingj
Jason Ankers
03/10/2021, 2:02 AM@matvei Yeah the picker is also a LazyColumn. Overriding those methods didn’t work unfortunately:
Copy code
.nestedScroll(object : NestedScrollConnection {
override fun onPostScroll(
consumed: Offset,
available: Offset,
source: NestedScrollSource
): Offset {
return Offset.Zero
}
override suspend fun onPostFling(
consumed: Velocity,
available: Velocity
): Velocity {
return Velocity.Zero
}
})m
matvei
03/10/2021, 10:53 AMAccording to the nestedScroll modifier documentation, please try to:
1. Remember the NEstedScrollConnection object.
2. return
availableVelocity.Zeroj
Jason Ankers
03/10/2021, 11:07 AMThat worked, thanks!
👍 1
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