Is it possible to get scroll offset in pixels for ...
# composej
Jason Ankers
05/21/2021, 2:36 AMIs it possible to get scroll offset in pixels for
LazyColumnfirstVisibleItemScrollOffseta
Albert Chang
05/21/2021, 2:53 AMThe point of lazy lists is that they lay out items lazily so that only items currently visible are laid out, which means heights of invisible items are unknown.
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Jason Ankers
05/21/2021, 3:36 AMHow could I achieve a fading background as the user scrolls down a list?
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Albert Chang
05/21/2021, 3:49 AMWhat do you mean by fading background?
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Jason Ankers
05/21/2021, 3:49 AMI mean adjust the alpha of a background colour gradually as the user scrolls down a list
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Albert Chang
05/21/2021, 3:52 AMUse item index then. I don’t think laying out all items is worth as it is much less performant.
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Jason Ankers
05/21/2021, 3:57 AMThat only works if all the items are the same size
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Albert Chang
05/21/2021, 3:59 AMI know you can’t make the fade completely linear by using index, but as I said,
I don’t think laying out all items is worth as it is much less performant.
Albert Chang
05/21/2021, 4:01 AMIf you really want to try, just use a scrollable column and see how much it is slower than
LazyColumnj
Jason Ankers
05/21/2021, 4:04 AMI don’t understand why losing virtualization is a requirement for tracking scroll offset? We had this functionality previously in our react native app which caches item heights as you scroll past them
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Albert Chang
05/21/2021, 4:06 AMWhat do you mean by virtualization? If you just want to know the heights of items you scrolled past, you can do the same thing.
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Jason Ankers
05/21/2021, 4:13 AMYeah it was more a question if theres anything out the box
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Albert Chang
05/21/2021, 4:14 AMI think no.
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joney
05/21/2021, 6:06 AMa
Andrey Kulikov
05/21/2021, 10:56 AMyes, it is expected to solve use cases like this with the nested scroll apis. but we don’t have good official examples yet as far as I remember
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