Hi again, I have problems using `subscribeAsState`...

# decompose

[Jan]

Hi again, I have problems using subscribeAsState :

interface IRootComponent {
    val dialogSlot: Value<ChildSlot<*, DialogComponent>>
}

My RootContent:

@Composable
fun RootContent(component: RootComponent, modifier: Modifier = Modifier) {
val dialogSlot by component.dialogSlot.subscribeAsState()
    dialogSlot.child?.instance?.also {
        DialogContent(dialogComponent = it)
    }
}

and then I get a compilation error saying:

Type 'State<ChildSlot<*, DialogComponent>>' has no method 'getValue(Nothing?, KProperty<*>)' and thus it cannot serve as a delegate

[Arkadii Ivanov]

Hmm, did you import that extension function? https://github.com/arkivanov/Decompose/blob/3fbf7c8cee02f89aed15a86897ae0fdcff124cbd/sample/shared/compose/src/commonMain/kotlin/com/arkivanov/sample/shared/counters/counter/CounterContent.kt#L15

[Jan]

god, damn it. I had to manually import it. Wonder why its not working ...

[Arkadii Ivanov]

Usually IDE automatically suggests importing this thing, but so far it has been working not so well.

[Jan]

What do you mean by "has been working not so well"? Is it a known issue for decompose?

[Jan]

Why I try auto-import, AndroidStudio imports import com.arkivanov.decompose.extensions.compose.jetbrains.subscribeAsState instead

[Jan]

is it due experimental decompose version?

[Arkadii Ivanov]

No, that is rather a bug in the IDE - https://youtrack.jetbrains.com/issue/KTIJ-16966. It's marked as fixed a long time ago, but sometimes it still doesn't work. If you search Slack for "getvalue import", you will find lots of messages.

[Arkadii Ivanov]

"subscribeAsState" is a normal function that returns Compose State, so State#getValue extension function has to be imported in order for by delegation to work.

[Jan]

ok, thanks. Feels like I am falling into every pit that exists

[Arkadii Ivanov]

That's alright, we are using bleeding edge tech 😁

[Jan]

another thing is the @Preview Annotation which also does not work

[Jan]

and other things:

[Jan]

image.png

[Jan]

but it compiles and works as expected

[Jan]

anyways ... I got my first slotNavigation working ... that feels great 😉

[Arkadii Ivanov]

The AlertDialog error seems valid - it shouldn't be available on all platforms I guess

[Jan]

Hm ok, but I do not understand it completely. I thought that AlertDialog would be available through compose.material or compose.material3. Just wondering because NavigationRail seems to be available. Is there a good way to figure out what is available for commonMain?

[Arkadii Ivanov]

You can try asking in #compose. Not everything is supported on all platforms.

[Jan]

I did in #compose-ios 😉

[Jan]

sorry to bother you, but I think there will be more come up. thanks so far

[Arkadii Ivanov]

So a dev from JB couldn't reproduce the issue. Would it be possible to provide a reproducer? They believe it's a bug.

[Arkadii Ivanov]

Here is an anti-reproducer where they claim everything works fine - https://github.com/daugeldauge/wizardly/blob/decompose/shared/build.gradle.kts

[Jan]

will check the anti-reproducer

[Jan]

anti-reproducer fails building/setup:

Caused by: java.lang.IllegalStateException: Executing of 'xcodebuild -project Pods.xcodeproj -scheme Base64 -sdk iphoneos -configuration Release' failed with code 65 and message:

[Jan]

will try to build an empty minimal sample

[Jan]

hm ... just wonder what should excactly fail. It seems to work in my minimal sample. First AS asks for the import

import com.arkivanov.decompose.extensions.compose.jetbrains.subscribeAsState

Afterwards AS asks for the import:

import androidx.compose.runtime.getValue

This also works in my other project

[Arkadii Ivanov]

Oh! Turned out I responded in a wrong thread, confused this thread with another one! https://kotlinlang.slack.com/archives/C03H3N51SKT/p1683725214780229

[Arkadii Ivanov]

So that reproducer is about exporting things with cocoapods

[Jan]

hm, ok. Maybe I will have a look later on.