Is there any way to ignore certain `LazyColumn` items when a

Question

Is there any way to ignore certain `LazyColumn` items when applying a `verticalArrangement` More details in thread

eygraber · Answer

My use case is that I have a `LazyColumn` that has 1 item at the top that manages the spacing between it and the next item I want all items after that to be spaced by `16 dp` I tried creating a custom `Arrangement Vertical` that in `arrange` manually handles the 1st item and delegates to an `Arrangement spacedBy 16 dp ` for the other items The problem is that `LazyColumn` only calls `Arrangement arrange` when there is spare space i e when the items don t extend past its viewport In order to get the proper spacing I have to also delegate `spacing` to the `Arrangement spacedBy 16 dp ` but that applies to my first as well

eygraber · Answer

I could solve this by nesting the `LazyColumn` inside a vertically scrolling `Column` and put the first item in that `Column` but that comes with its own challenges specifically the issue where a vertically scrollable component has an infinite maximum height The exception even calls out this case explicitly ```Vertically scrollable component was measured with an infinity maximum height constraints which is disallowed One of the common reasons is nesting layouts like LazyColumn and Column Modifier verticalScroll If you want to add a header before the list of items please add a header as a separate item before the main items inside the LazyColumn scope```

eygraber · Answer

I m having a similar issue with `LazyColumn` where I want my first item to have a specific padding that is different from the rest of the items Any chance that `item` could get a parameter specifying whether it should ignore `contentPadding` and `verticalArrangement`

shikasd · Answer

I believe the canonical solution for this is ```item First item with specific padding Spacer Modifier size firstItemPadding items The rest of the list ``` You can also try and arrange items with Spacer padding modifier without the arrangement

eygraber · Answer

There s still an issue with horizontal content padding I get the feeling that content padding and arrangements work well in a narrow set of cases albeit that narrow set is probably the overwhelming majority of cases

shikasd · Answer

Yeah most built in components are like this e g there are cases when it is easier to build a custom Row instead of using the default one Our north star is to make building custom Lazy layouts as easy as that but we have a really long way to go because of sheer complexity they have

eygraber · Answer

Luckily most of these things have acceptable workarounds other than the spacedBy arrangement In my particular use case these issues are arising at the intersection of infinite height LazyColumn nested in a scrollable Column If it weren t for that I would hoist the header into the scrollable column and it would solve all of my problems

shikasd · Answer

Making potentially infinite scrollable container work inside infinite constraints solves way less problems than it creates unfortunately D E g fling and whatever limited scrollbar support will be broken straight away