`Nav3` docs say When to use a decorator (in jetpa...

# compose

[ursus]

Nav3 docs say

> When to use a decorator (in jetpack compose nav3)
>
> Use a decorator to:
> ...
> Scope an object to multiple NavEntrys. For example, to share a ViewModel between multiple entries.
Is this the case of.. say I want to share some object between "registration flow" nav entries?

If so, how?

To map down keys to a common value and then use remember(common value) { .. } , like this

class RegistrationFlowDecorator : NavEntryDecorator<Any>(
    decorate = { entry ->
        val isRegistration = when (val key = entry.key) {
            is RegistrationEmail,
            is RegistrationPassword -> true
            else -> false
        }

        if (isRegistration) {
            val sharedThing = remember(isRegistration) { RegistrationSharedThing() }
            CompositionLocalProvider(LocalRegistrationSharedThing provides sharedThing) {
                entry.Content()
            }
        }
    }
)

?

I'm not sure about the if (isRegistration) though