Hello folks, I'm having some difficulty modelling state with Compose, Paging3 and MVI(Orbit). Since ...

# orbit-mvi

[Vishnu Ravi]

Hello folks, I'm having some difficulty modelling state with Compose, Paging3 and MVI(Orbit).
Since paging3 recommends to expose a flow, that it can later collect lazily in the UI, I've to send a flow in my emitted state. Here goes my queries

1. The approach works, but my tests fails because emitted flow != fake flow. (The cachedIn operator will convert my fake into a viewmodel managed instance). At this point the standard kotlin equal function will not work and I have to manually assert on all the properties. Am i overlooking something?
2. Is it okay to emit a flow in a state or is there a better way with paging3 compose?

sampleusecase.kt.cpp

[Guilherme Delgado]

Nice question, looking forward for the response. At first sight, exposing a Flow in the MyUiState seems like breaking the SSOT 🤔

[Guilherme Delgado]

What happens if you’re scrolling and then a new State is emitted?

[Vishnu Ravi]

At first sight, exposing a Flow in the MyUiState seems like breaking the SSOT...

Yeah 🤔 ...But if you think about it MyUiState is still the SSOT here, but since LazyList is doing most of the heavy lifting, we would have to feed it a "refreshable" data and suddenly it becomes a crucial part of the state.

Whereas in the old view based world, we had direct access to backing adapters. We could collect /emit/submit new data as and when we require it, without sharing the source 😅

[Guilherme Delgado]

yes but i still believe SSOT will be compromised because now you have a Flow that can change de state independently of MyUiState emissions.
The ui state should be the one sending new content, not the flow

[Guilherme Delgado]

but i get it, is a very valid question and i’m looking forward to the right answer 😅

[Guilherme Delgado]

so far i’m doing it manually instead of using Paging3 (not mainly because of this reason)

[Vishnu Ravi]

Ah, now I'm really curious to know more about this other reason 😛

[Guilherme Delgado]

editing, removing (and undo by adding back at index) items without invalidating the hole list. Cloud not achieve that with Paging3 😅

[Vishnu Ravi]

Understood 👍

[dave08]

I see nobody really has an answer to this apart from doing it manually...?