What is the right way of finding the size of a `Box` after it is created? Or any other `Composable` ...

# compose

[Halil Ozercan]

What is the right way of finding the size of a Box after it is created? Or any other Composable for that matter?

[pavi2410]

Checkout Modifier.drawWithContent

val (boxSize, setBoxSize) = state { 0 }

Box(modifier = Modifier.drawWithContent {
    drawContent()
    setBoxSize(size)
})

I tried something like this

[Halil Ozercan]

Thanks, that did the trick 🙂

[Zach Klippenstein (he/him) [MOD]]

The onPositioned modifier is probably a better fit for this use case: https://developer.android.com/reference/kotlin/androidx/ui/core/package-summary#onpositioned_1

[Zach Klippenstein (he/him) [MOD]]

There’s also `WithConstraints`: https://developer.android.com/reference/kotlin/androidx/ui/core/package-summary#withconstraints

[Leland Richardson [G]]

question: what are you using it for?

[Leland Richardson [G]]

the onPositioned modifier will likely have an onSizeChanged sibling API soon which would be even better

[Halil Ozercan]

I'm trying to calculate a drag gesture with respect to the size of the view itself. In other words, drag's behavior will depend on the percentage.

[Halil Ozercan]

This is what I came up with after using onPositioned . All media controllers are written in Compose. Only the video surface is inflated by AndroidView .

device-2020-07-23-005230.webm