Q: how do I size a window to fit its contents in J...

# compose-desktop

[natpryce]

Q: how do I size a window to fit its contents in Jetpack compose? (Eg What is the equivalent of Swing’s pack method?)

[CLOVIS]

I'm not an expert, so I could be wrong, but Compose works the opposite way to Swing: components adapt themselves to the size of the window (this is much more performant), so I don't think it's possible to implement this

[natpryce]

I guess that makes sense on a hand-held device where the UI usually fills the (small) screen. But makes for an awkward experience on desktop without hard-coding a window size, which duplicates size information known by the window contents. I’ll keep exploring…

[Alexander Maryanovsky]

Pass Dp.Undefined as the window size

[natpryce]

You mean Dp.Unspecified? That doesn’t work — the window is created much too large.

[Alexander Maryanovsky]

fun main() = singleWindowApplication(
    state = WindowState(size = DpSize.Unspecified)
){
    Box(
        Modifier.size(200.dp, 300.dp)
    )
}

works for me

[Alexander Maryanovsky]

You can even “pack” on each axis individually:

fun main() = singleWindowApplication(
    state = WindowState(width = Dp.Unspecified, height = 200.dp)
){
    Box(
        Modifier.size(200.dp, 300.dp)
    )
}

[natpryce]

Which version of Jetpack compose are you using?

[Alexander Maryanovsky]

1.3.0

[Alexander Maryanovsky]

There’s a known bug where this doesn’t work for undecorated windows: https://github.com/JetBrains/compose-jb/issues/2676

[natpryce]

My window is decorated.

[natpryce]

I get different layouts if I add the wrapContentSize modifier to the children in the window content. None of them change the size of the window yet,. but they do affect the size of intermediate containers.

[natpryce]

I’ll experiment with various modifiers and see if I can get it to work

[natpryce]

Dp.Unspecified seems to be the way to go, but I need to be careful about how layout info is specified / propagated within the window

[natpryce]

Thank you

[Alexander Maryanovsky]

np