How can the current compositing function create a vec of its children?

[Aiving]

I'm learning this library and trying to write something Jetpack Compose using it, but I'm a bit confused about how to calculate the size of the current "element" without knowing (and calculating in advance) the sizes of its children.
The question is exactly how to recognize them, or to be more precise, to make a Vec<T> with them.
Jetpack Compose appears to use Applier for this (although I couldn't find the exact place where it uses a function to add an item to the stack of the current Applier), but I didn't see anything similar here. Is this even possible?

[cksac]

There have a layout tree using this crate https://github.com/cksac/compose-taffy, you may get some insights there

[Aiving]

There have a layout tree using this crate https://github.com/cksac/compose-taffy, you may get some insights there

Yup, I took a look at it and the jetpack compose document about phases and realized that trying to get children in the composition phase is a bad idea. Thanks anyway, with the relatively recent update (I only saw it yesterday) the library has become much clearer and easier to use ❤️