I’m looking at a pattern shown in the image below from a very helpful talk on Molecule by Ash Davies...

# squarelibraries

[Troy Perales]

I’m looking at a pattern shown in the image below from a very helpful talk on Molecule by Ash Davies and Bill Phillips. I understand these snippets aren’t meant to be taken literally, but I’m having difficulty filling in some of the blanks.

1. I get A MonotonicFrameClock is not available in this CoroutineContext... crash when I use viewModelScope to launch Molecule as it is bound to Dispatchers.Main.immediate. My solve was to simply launch with AndroidUiDispatcher.Main, since having the ViewModel hold the Presenter is enough to make it survive configuration changes. Am I missing something else here?

2. What is the recommendation for emitting events within a Composable screen (or any view, for that matter)? The snippet has events as a SharedFlow, but it does not successfully emit an event when I call events.tryEmit(LoginEvent) and calling emit directly won’t work outside a coroutine.

[andrew]

Ooooo, more molecule resources 🙂

[Troy Perales]

https://www.droidcon.com/2022/09/29/demystifying-molecule-running-your-own-compositions-for-fun-and-profit/

[andrew]

Thanks!!

[andrew]

Also, 1 does use AndroidUiDispatcher.Main

[andrew]

As for #2, I emit them from my viewmodel

[andrew]

I also keep my “presenter” separate, but this could easily be kept in the VM

[andrew]

My presenter takes these events and performs actions based on these events, and transforms the state that come from the repository

[andrew]

message has been deleted

[andrew]

EventsEffect is just a shorthand I made to avoid lambda soup🙂

[Jaime]

https://www.youtube.com/watch?v=TkQzAN-irAQ&list=PLY-K9deHTAW7w28X1RL1YKAk9gCrvVr54▾

I found this presentation is also very well explained

[Daniel Perez]

@andrew In that EventsEffect example, how do you launch new coroutines since the CoroutineScope provided by LaunchedEffect is no longer available?