Comments (5)
You probably need to update the callback when your state changes. Try with:
@Composable
fun MyMapComposable(modifier: Modifier = Modifier, myData: MyData, mapState: MapState) {
LaunchedEffect(myData) {
mapState.onMarkerClick { id, x, y ->
Log.d("Bug", "my marker state: ${myData.someList.size}")
}
}
MapUI(modifier, state = mapState)
}
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yep, that works too - but i'm not quite sure why i would need to do that .
shouldn't the lambda access the updated data anyways? (data is correctly updated outside of the callback)
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That's because LaunchedEffect
can take keys as parameters, and whenever one keys changes of value, the composable block is recomposed. By using LaunchedEffect(Unit){..}
, you are actually capturing the initial value of your state.
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thanks, i thought i'm aware of the concept of LaunchedEffect
but assumed that the created callback (lambda) would still access the current state - seems it also captures a snapshot of the current state -interesting.
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Another approach is to call a method from the view-model from the lambda, passing id
, x
and y
values. Since the view-model has all necessary data, you can do necessary operations and state changes from there, without having to worry about updating the lambda.
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Related Issues (20)
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