Add navigation listener

[BioRyajenka]

Hi,

This is a request to add navigation listener to the lib.

I want to spawn analytics events on navigation and currently I do smth like:

navController.navigateAndSpawnAnalyticsEvent(dest)

But custom code is not convenient and having an ability to add listener would be great.

[vkatz]

You can use extensions in this case, see:

Tiamat/example/content/src/commonMain/kotlin/composegears/tiamat/example/content/content/advanced/AdvExtensions.kt

Line 91 in b5610ca

class LocalExtension(val logMessage: String) : ContentExtension<Any?> {

[vkatz]

Another option is smth liks

val nc = rememberNavController(..)
LaunchEffect(nc.current){ // current is a state, so every time you navigate it will changed and call code below 
     trackScreen(nc.current)
}
...

i may add smth to see if it was back or frorward navigation

[BioRyajenka]

Ideally, I need to know both "from" and "to" screen, and both your suggestions allow to know the target destination only. Or am I missing smth? 🤔

[vkatz]

both "from" & "to"... hmmm it might be a case...

[vkatz]

@BioRyajenka Some updates on fast solution, found in the notes "why dont we need nav listeners"

var lastScreen by remember { mutableStateOf<NavDestination<*>?>(null) }
LaunchedEffect(navController.current) {
    val currentScreen = navController.current
    if(lastScreen != currentScreen){
        // track from lastScreen to currentScreen
        lastScreen = currentScreen
    }
}

You can combine it with Extensions api and reuse

[BioRyajenka]

That would work, thanks!
Still not as easy as listener, if you consider adding them