I am having weird behaviour with `BoxWithConstraints` composable. The closure that is being passed ...

# compose

[Namig Tahmazli]

I am having weird behaviour with BoxWithConstraints composable. The closure that is being passed to it gets called multiple times with the height being different values each times. There is no animation or no state that can cause it to be recomposed.

P.S. I am using 1.0.0-rc01 version of compose.

The code and stack trace in 🧵

[Namig Tahmazli]

ComposeView(requireContext()).apply {
            layoutParams = ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT
            )
            setContent {
                BoxWithConstraints(modifier = Modifier.fillMaxSize()) {
                    println("<<<<<<<Height ${constraints.maxHeight}")
                    println("<<<<<<<Width ${constraints.maxWidth}")
                    Box(modifier = Modifier.matchParentSize().background(Color.Cyan))
                }
            }
}

Stack trace:

I/System.out: <<<<<<<Height 1868
I/System.out: <<<<<<<Width 1080
I/System.out: <<<<<<<Height 2022
I/System.out: <<<<<<<Width 1080
I/System.out: <<<<<<<Height 1868
I/System.out: <<<<<<<Width 1080
I/System.out: <<<<<<<Height 2022
I/System.out: <<<<<<<Width 1080
I/System.out: <<<<<<<Height 1868
I/System.out: <<<<<<<Width 1080

[Daniele Segato]

Views do not measure in a single pass

[tad]

That wouldn't explain this; I suspect each log there is coming from a new ComposeView

[Namig Tahmazli]

The ComposeView is created in onCreateView of a Fragment. I checked and it got called only once.

[Namig Tahmazli]

@Daniele Segato If I put a Box with swipable modifier inside BoxWithConstraints then the closure that is being passed to BoxWithConstraints gets called multiple times (while swiping) and it affects the performance a lot if you place PlayerView or MapView inside BoxWithConstraints. So in my opinion the body of BoxWithConstraints should only be called if the width or height of the composable changes in which the BoxWithConstraints is added to.

[Daniele Segato]

Mine was just a theory. I don't use ComposeView yet, not directly

[Jan Skrasek]

Have you solved this? I have the same problem right now. Even with 1.1.0-alpha04.