My view model has a computed property - it forwards to an underlying model that does not know about ...

# compose

[robnik]

My view model has a computed property - it forwards to an underlying model that does not know about the MutableState type. Is there a way to signal Compose when this computed property has changed, without keeping a separate copy of the data in my view model as a MutableState? (In SwiftUI I do this with objectWillChange.send())

[dewildte]

Can you give an example of how the data is being forwarded? A small code example perhaps?

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

You could publish the property as a StateFlow, but why don’t you want to store a copy of the computed value? That value has to be in memory somewhere, and it would be a lot simpler to just publish the property via a derivedStateOf from your view model.

[robnik]

I have a property on my viewmodel (for a settings screen) that looks like this:

var isPreloadingImages: Boolean
    get() = PreferencesDB.shared.isPreloadingDetailsPageImages
    set(newValue) { PreferencesDB.shared.isPreloadingDetailsPageImages = newValue }

I feel like I should be able to use model classes like PreferencesDB without having to edit them to make them Compose-aware, with things like MutableState .