Does `currentLines` ever get updated from the `onTextLayout`

Question

Does `currentLines` ever get updated from the `onTextLayout` block Like if you removed everything else

Paul Woitaschek · Answer

Yes as you can see in the preview it shows extraLines=2

Chris Johnson · Answer

I think you found a bug limit with preview + onTextLayout potentially If I run this code in an app I get extraLines = 1 and it works as I would ve expected it to If I run it in preview I get what you get

Alex Vanyo · Answer

A case like this is a recomposition loop which you generally want to avoid <https developer android com jetpack compose phases recomp loop> gt If I run this code in an app I get extraLines = 1 and it works as I would ve expected it to In an app you will likely see what is displayed in the preview for a single frame and then on the following frame you ll see what you expect The preview is only showing that first frame where `currentLines` is `0`

Alex Vanyo · Answer

``` Preview Composable fun Repro var show by remember mutableStateOf false if show TextRepeatEmptyLines text = Hey lines = 2 LaunchedEffect Unit delay 1000 show = true ``` That should make the single frame a bit more obvious if you run it on a device by delaying it 1 second after launch

Chris Johnson · Answer

I haven t seen this article on the developer docs yet wow This actually kind of addresses a lot of problems I ve been dealing with ~Quick question for you Alex In the article they recommend using a layout primitive to solve this cyclic problem of changing state via `onSizeChanged` I m not 100 sure what a layout primitive is Is it just a `Column Box Row` ~ Edit Got it sweat smile

Alex Vanyo · Answer

Right start with built in elements like `Column` `Box` `Row` and if you need to do something more custom that isn t supported with those or a combination then go a level deeper and use `Modifier layout` or `Layout` <https developer android com jetpack compose layouts custom|custom layouts> describes those in detail

Paul Woitaschek · Answer

Do you have an idea how this could be done otherwise The goal is to have a Text with a minLines

Alex Vanyo · Answer

I think is the tracking issue for something built in but in the meantime `Paragraph` is the utility for measuring the size of text directly That s how `maxLines` is implemented It should be possible to fork a version of that for `minLines` pretty easily