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[ScrollView] Add completion callback to scrollTo
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targetfend robics
This is already implemented if you check with the source code, although the lack of documentations in the RN's repo makes it hard for developers to use it. https://react-native.canny.io/feature-requests/p/octordle
D
DebbieQuick
No, when I tested my Android Proof of Concept, I ran into a problem where the callback would be triggered before the screen has actually refreshed. I haven't looked into RN internals anymore[url=https://ectipakistan.com/factors-of-35/].[/url] If necessary, I can share what I've got so far.
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A
Asad
I'm also using scrollView in flastlist. it's working is perfect and you may try this code. it may be helpful for you
code
<ScrollView ref={(ref) => { this.scrollViewRef = ref; }} onLayout={this.scrollToInitialPosition}>
-------------here is your code ----------
</ScrollView>
scrollToInitialPosition = () => {
-------- add you variable name before dot-------
.map((item, key) =>
{
if(item.selected == true)
{
this.scrollViewRef.scrollTo({ y: key});
}
});
}
Roberto Wesley Overdijk
Is this in progress or tbd?
Luke Wilimitis
Working on implementing this natively, I've PoC'd two approaches so far on Android which, as far as I can tell, work as expected.
The JS apis would either be:
- ScrollView.scrollTo({x: foo, y: bar, animated: true, callback: () => {...});
- ScrollView.onScrollToComplete={() => {...}};
The second approach fits closer to existing view APIs, but, in the case where there are multiple ways to trigger a scrollTo on the screen, it may require overwriting onScrollToComplete before each request to scrollTo. Otherwise, it would not be obvious which scrollTo had actually completed inside onScrollToComplete.
Before proceeding with iOS for either approach, I'm curious if there are any strong feelings either way for the APIs (or perhaps, something I hadn't thought of!).
bd-arc
Luke Wilimitis: Wow, thank you very much for tackling this beast; I can't wait to see this feature finally come to life!
Regarding your question, I personally prefer the first API. It nicely complements the existing one and, as you've already stated, the other one might prove tricky to handle.
Do not hesitate to share the link to your PR as soon as you submit it so we can all upvote it ;-)
Michael Lefkowitz
Luke Wilimitis: +1 for first option
J
Jonas Frid
Luke Wilimitis: Just checking in on this one. Did it make it to an approved PR in the end?
Luke Wilimitis
Jonas Frid: Nope, in testing my Android PoC I encountered an issue with the non-animated scroll case where the callback would be invoked before the screen had visibly updated, and have yet to dig further into RN internals. I can post what I have so far if needed.
Egor Iakovlev
Luke Wilimitis: Hey, what is the current status? :)
Hoang Pham
This is already implemented if you check with the source code, although the lack of documentations in the RN's repo makes it hard for developers to use it. The props of
ScrollView
(or FlagList
) is onScrollEndDrag
.bd-arc
Hoang Pham: Thank you for your insight.
onScrollEndDrag
is well known and used, but it is not that reliable and doesn't answer the original request.The only case where
onScrollEndDrag
is always triggered is when the user lifts his finger after dragging the ScrollView
, while we need a reliable callback for a programmatic call to scrollTo()
.bd-arc
This is a much needed feature for advanced
ScrollView/VirtualizedList/FlatList
.It's possible to implement a workaround on the JS-side by tracking the
Animated.event
value during onScroll()
(the Animated
version being used to prevent missed scroll events), but a native implementation would be way better and more reliable.D
DebbieQuick
No, when I tested my Android Proof of Concept, I ran into a problem where the callback would be triggered before the screen has actually refreshed<a href="https://ectipakistan.com/factors-of-35/">.</a> I haven't looked into RN internals any more. If necessary, I can share what I've got so far.