Trying to work on a custom `Layout()` . Have some ...

# compose

[Stylianos Gakis]

Trying to work on a custom Layout() . Have some problems with constraints, more in thread 🧵

[Stylianos Gakis]

Given my code that looks approx like this:

Layout(
    modifier = Modifier.size(40.dp),
    content = {
        Image(
            painterResource(R.drawable.ic_something_with_24dp_size),
            contentDescription = null,
            modifier = Modifier.size(24.dp)
        )
        Box(modifier = Modifier.size(12.dp)) {}
    },
) { measurables, constraints ->
    val image = measurables[0].measure(constraints)
    val circle = measurables[1].measure(constraints)
    // etc.
}

What should I do to mage image and circle measure with 24 and 12 dp respectively?
Now it gives them both 40.dp size just because the constraints allow it, but I have explicitly given them 24 and 12dp instead.

[Stylianos Gakis]

I just rubber ducked myself 😅
Setting the constraints as

val image = measurables[0].measure(constraints.copy(minWidth = 0, minHeight = 0))
val circle = measurables[1].measure(constraints.copy(minWidth = 0, minHeight = 0))

Fixes the problem, as before the constraints passed down were min AND max 110 (aka 40.dp).
Very interesting that it was like that, it’s probably because the .size() modifier sets both min and max size for the item.