hi, is there a way to use an annotation to add more composable code to a composable function, for ex...

# compose

[abbic]

hi, is there a way to use an annotation to add more composable code to a composable function, for example a particular LaunchedEffect?

[Alex Styl]

no. what are you trying to achieve?

[abbic]

i'd like to be able to write

@TrackPageView
@Composable 
fun SomethingScreen() {
    // etc
}

and have some autogenerated code that fires some analytic event when the screen comes into the composable hierarchy

[abbic]

because the tracking code that i have would like to run off a LifecycleEffect i'd want to basically have an extra composable glommed on via this annotation, if possible

[Alex Styl]

I think it is doable, but I dont have any experience on it. I would have a look at projects that use ksp as a starting point

[Alex Styl]

https://kotlinlang.org/docs/ksp-overview.html

[MR3Y]

You can't use ksp for your usecase. ksp can't modify an existing code(functions, classes..etc). You will need to dig a bit deeper and write a compiler plugin for this usecase.

[abbic]

v well, doesnt sound worth the effort at all then 😅

[abbic]

thanks both

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

It’s not very idiomatic to do this with an annotation in kotlin anyway. I would suggest just writing a PageViewTracker wrapper composable that you wrap the body of SomethingScreen inside. It’s not much more code than an annotation, but much easier and way less magic.