I tried to share some states between my screens in NavHost but it doesn't update when the appState c...

# compose

[Akram Bensalem]

I tried to share some states between my screens in NavHost but it doesn't update when the appState change !!!
Any one know why it doesn't recompose when the appState change ?

[Stylianos Gakis]

It should work.
Does AppState itself change, or some internal state of AppState?
If it’s internal state, is that defined as a MutableState or a simple var?
A peek inside your AppState would make it easier to debug.

[Akram Bensalem]

It's internal State

[Stylianos Gakis]

Could you show the call-site as well?

At a glace, the bottombarVisibility and drawerVisibility should not be `var`s, since they themselves should not be changing, but their internal state.

But there doesn’t seem to be anything wrong with the isLandscape part. It relies on windowSizeClass which is a val and should only be updated when you construct a whole new AppState object.

Can I see where you’re constructing and remembering your AppState object as well?

[Rick Regan]

I think this is the same problem I had, which I fixed this way: https://kotlinlang.slack.com/archives/CJLTWPH7S/p1660238432465599

[Akram Bensalem]

yes, It's the same problem as mine.... I didn't know how to implement your solution

[Rick Regan]

This is the structure of what I did:

@Composable
fun AppNavGraph(
    ...
    settings: Settings
) {
    val settingsAsState = rememberUpdatedState(settings)
    NavHost(...) {
        settingsNavGraph(
            ...
            settings = { settingsAsState.value }
        )
    }
    ...
}

fun NavGraphBuilder.settingsNavGraph(
    ...
    settings: () -> Settings
) {
    navigation(...) {
        composable(
            route = ...,
        ) {
            SettingsScreen(
                ...
                settings = settings()
            )
        }
        ...
    }
}

[Rick Regan]

Except you do it for appState, not settings.

[Akram Bensalem]

Thank you ❤️ ❤️