Hi. On the layout codelab it shows this to create a new custom layout:

Layout(
        modifier = modifier,
        content = content
    ) { measurables, constraints ->

        // Don't constrain child views further, measure them with given constraints
        // List of measured children
        val placeables = measurables.map { measurable ->
            // Measure each child
            measurable.measure(constraints)
        }
    }

But, with RC01, whenever I try to import and create one,

Layout

has a new parameter called

measurePolicy: MeasurePolicy

... what should we do with this one?

MeasurePolicy

is the lambda (

{ measurables, constraints -> ... }

).

aaaaaaaaaaaaaaah

Yup! You can also create your own

MeasurePolicy

objects, for example when needing more information about the children. We added a new example in the Intrinsic measurements Layouts doc: https://developer.android.com/jetpack/compose/layouts/intrinsic-measurements#intrinsics-in-layouts In there, apart from

measure

, you need to override some intrinsics methods if you want to provide a custom impl when the default is not good enough for your custom layout/modifier