How to share business logic? Similar to using viewmodel, multiple pages share one viewmodel

[cjcj125125]

When using viewmodel before, I could use the activity's viewmodel in the fragment. So when using decompose, how can multiple pages share a component?

[arkivanov]

If you want to share a component between other child components, you have to scope the shared component somewhere at the parent level and then inject it to your child components.

Pseudocode:

class SharedComponent(componentContext: ComponentContext)
class Component1(componentContext: ComponentContext, sharedComponent: SharedComponent)
class Component2(componentContext: ComponentContext, sharedComponent: SharedComponent)

class ParentComponent(componentContext: ComponentContext) {
    private val sharedComponent = SharedComponent(childContext("shared-component"))

    val stack = childStack(...) { cfg, ctx ->
        when (cfg) {
            is Config.Config1 -> Component1(ctx, sharedComponent)
            is Config.Config2 -> Component2(ctx, sharedComponent)
        }
    }
}