Trying to use `.preferredHeight(IntrinsicSize.Min)...

# compose

[Arun]

Trying to use .preferredHeight(IntrinsicSize.Min). Getting the following error if a Composable using it is inside ScrollableColumn:

java.lang.IllegalStateException: Intrinsic measurements are not currently supported by SubcomposeLayout

Any idea what this is and how to get around this? I’m currently on alpha07.

[Adam Powell]

SubcomposeLayout is an implementation detail of a class of components that perform subcomposition during layout. Intrinsic measurements are a light-ish way of performing speculative measurement of a child - in other words, a way of querying child measurement parameters before performing the "real" measurement.

[Adam Powell]

Since SubcomposeLayout doesn't know its contents until it is measured, it wouldn't be able to query intrinsic measurements without performing subcomposition - a fairly heavy-weight operation

[Adam Powell]

so this is sort of protecting you from doing repeated layout that would become too expensive to scale well

[Adam Powell]

as for how to get around it - determine which part of the composable that you're trying to apply preferredHeight(IntrinsicSize.Min) to is performing subcomposition and use a different tool there, or find another way to express your layout other than preferred*(IntrinsicSize.*)

[Arun]

Oh ok. Got it. What would be your suggestion for recreating layouts such as in https://developer.android.com/codelabs/jetpack-compose-layouts#9 where the left and right item with respect to divider are fairly complex? ConstraintLayout?

[Adam Powell]

a layout composable that has a way to express measurement ordering similar to how Box offers Modifier.matchParentSize()

[Adam Powell]

by annotating a child with parent data, a parent layout can decide which children determine the parent height and which children are measured using the results of the other children being measured

[Arun]

Thanks for the suggestion 👍