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kotlinlang

Is there a way to get the height of a composable? Not the min and max height but the measured height? Code in thread.

```BoxWithConstraints {
  TopAppBar(
    ...
  )
}```
I would like to get the height of the TopAppBar here and store it in a `remember{ mutableStateOf() }` to use in other parts of the code.

You can use `Modifier.onGloballyPositioned`

There is a default available for app bar height as well. AppBarDefaults (as long as your not creating your own composable or causing it to grow in height. 

App bar is generally a static height unless it's being animated

Depends why you need the size. If you need the size to influence composition of sibling content you can use `SubcomposeLayout` (`Scaffold` is a good example). If you don't need to influence composition you can use `Layout().`

`Modifier.onSizeChanged()` or `onGloballyPositioned()` can easily result in composition loops, so should only be used as a last resort and with care.