If I have a composable with a lambda param like this: `compact: @Composable () -> Unit`, and sometim...

# compose

[Tgo1014]

If I have a composable with a lambda param like this: compact: @Composable () -> Unit, and sometimes it can not render anything:

compact = {
    uiModel?: return@ContentFadeBottomSheet
    MyComposable(uiModel)
}

Is there a way to know that the compact() changed (when uiModel is not null anymore) so I can remeasure the height? I tried to use key(compact) but didn’t work

[Stylianos Gakis]

If you do

Box(Modifier.onPlaced { storeSizeHere }) {
 compact()
}

on the function which receives the lambda, does it do what you want?

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

compact should recompose when uiModel changes automatically if uiModel is snapshot state, and if that emits or removes layout nodes your parent should automatically remeasure. So you shouldn’t have to do anything special.

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

At one point there was a bug with early returns in composable functions, I’m not sure if that was fixed so you might be running into that here. If you change it to this, does it work?

if (uiModel != null) {
  MyComposable(uiModel)
}

[Tgo1014]

Sorry for taking long to reply. @Zach Klippenstein (he/him) [MOD] unfortunately changing it to an if also didn’t work. In the end I used some other flag based in the uiModel not being null to trigger a key(isShowing) so it would recalculate what I needed, not sure if it’s ideal but it works 😬

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

Where's uiModel coming from?