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#compose
Title
# compose
t
than_
03/08/2021, 3:41 PMHi, I'm trying to update my state with reducer. The only way I was able to achieve that was by using
ViewModelcollectAsStatez
Zach Klippenstein (he/him) [MOD]
03/08/2021, 4:50 PMNot quite sure what you’re seeing - when running your compose preview in interactive mode, updates to your view model State are not triggering recomposition?
t
than_
03/08/2021, 5:10 PMYes, that's the case. Should have been clearer, sorry.
z
Zach Klippenstein (he/him) [MOD]
03/08/2021, 5:32 PMI’m very much just guessing here, but since the interactive preview isn’t running a real environment, it might be doing something weird with the view model provider - maybe the fake provider isn’t memoizing correctly or something?
t
than_
03/08/2021, 6:49 PMYeah seems like it. I've tried to make it work without ViewModel using something like this
that does not update the state at all 😕
z
Zach Klippenstein (he/him) [MOD]
03/08/2021, 7:06 PMare you `remember`ing that?
t
than_
03/08/2021, 7:59 PMsure, call site looks like this:
Copy code
val (stt, dispatch) = remember { reducerStateOf(1, ::reducer) }z
Zach Klippenstein (he/him) [MOD]
03/08/2021, 8:09 PMWouldn’t you want to return a
State<STATE>rememberso e.g.
Copy code
fun <ACTION, STATE> reducerStateOf(initialValue: STATE, reducer: Reducer<ACTION, STATE>): Pair<State<STATE>, Dispatch<ACTION>> {
val state = mutableStateOf(initialValue)
val dispatch: Dispatch<ACTION> = {action: ACTION ->
val newState = reducer(action, state.value)
state.value = newState
}
return state to dispatch
}i’m guessing that’s why you’re not seeing changes
t
than_
03/08/2021, 9:21 PMYep that was it 🙂 thank you very much
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