Is there a way to emit an element that is ignored for the purposes of layout?

# compose

[Alexander Maryanovsky]

Is there a way to emit an element that is ignored for the purposes of layout?

[ephemient]

Modifier.size(0.dp).wrapContentSize(unbounded = true)

(untested, but I think something like that may work)

[Alexander Maryanovsky]

Unfortunately that’s not ignored. It’s just 0x0

[Alexander Maryanovsky]

If you add it to a Column(verticalArrangement = Arrangement.spacedBy(100.dp) you will definitely see its effect.

[Alexander Maryanovsky]

It probably doesn’t exist, but I was hoping maybe there’s some modifier you can tag the element with.

[Ian Lake]

The content of a Popup is independent from the rest of the composition: https://developer.android.com/reference/kotlin/androidx/compose/ui/window/package-summary#Popup(androidx.compose.ui.A[…]Properties,kotlin.Function0)

[Alexander Maryanovsky]

Funny you should mention Popup. The reason for this question is me trying to address this issue: https://github.com/JetBrains/compose-multiplatform/issues/2729

But looking at the Android code, it seems to suffer from the same problem, because AndroidPopup emits the same empty layout whose purpose is to get the parent’s position: https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/[…]android.kt;drc=82abb7ed0792545abb32c5a3ae7a12051aed1556;l=309

[Alexander Maryanovsky]

Confirmed that Android has the same bug.

[ephemient]

hmm. popup position is based on position in the layout, and I don't see a way to get that without being laid out, which will have that spacing effect in row/column

[Alexander Maryanovsky]

Need something like LocalCoordinates

[ephemient]

how would that work?

Layout(content = {
    Foo()
    LocalCoordinates
    Bar()
}, measurePolicy = { measureables, constraints ->
    // custom code

I don't think you can observe the coordinates it would be laid out at, without potentially affecting layout

[Alexander Maryanovsky]

It could work like onGloballyPoisitioned, but without the actual node

[Alexander Maryanovsky]

Maybe like ‘LocalCoordsProvider.current.onLocalCoordinates{ }`

[myanmarking]

Why cant you create a composable wrapper with an of else and your ignore condition there?