is there a way to remember a layout height in compose? Use-case: • I have some Box positioned in the screen (it's inside the Column) • User hits some button, some job begins • Now I want to hide the box and show a CircularIndicator positioned at that (now invisible) Box's center In code I do something like

if (isJobRunning) Box() else CircularIndicator()

but that makes progress bar jump. In old View system I would wrap them both in FrameLayout and have the indicator use

layout_gravity=center

while setting

box.visibility = INVISIBLE

. What path should I take in Compose?

You can do the same, wrapping this code with another

Box

. Box is analogue for

FrameLayout

But the thing is that only one child can be visible at one moment. And I want that

Box

to always retain size of the largest child, even if it's not currently in composition. With

FrameLayout

this is solved by having

Invisible

state which retains view size during a layout phase. Not so here...

Ah, now I get it. AFAIK

INVISIBLE

is

Modifier.opacity(0f)

now

I thought about this, but it felt a bit like a hack, so I thought I'd ask if there's a more idiomatic way 🙂

Yeah it seems strange for me too. Personally I never had to emulate

INVISIBLE

. There was a discussion sometime ago and it seems that community agreed on that is

INVISIBLE

is now

opacity(0f)

. https://kotlinlang.slack.com/archives/CJLTWPH7S/p1594659399205900

Thank you! 👍