How can the parent composable communicate events t...
# composea
allan.conda
08/24/2022, 7:40 AMHow can the parent composable communicate events to the child composable?
For example, I want to scroll-to-top the start destination when the bottom bar is tapped.
y
Yashwant Gowla
08/24/2022, 7:44 AMUsing states in compose
https://developer.android.com/jetpack/compose/state#state-in-composables
f
Filip Wiesner
08/24/2022, 9:16 AMIdeally the events should go only up and state go down in the view hierarchy.
Try reading specifically the State hoisting chapter in the documentation YG6008 linked.
y
Yashwant Gowla
08/24/2022, 9:19 AM@Filip Wiesner 👍
f
Filip Wiesner
08/24/2022, 9:21 AMBut if have to do it like this, then you can always pass something like listener callback or some other thing that the child will listen to 🤷 But I would advice against doing that.
Or if you have a ViewModel that you pass to this child, you could pipe the event through it.
b
Ben Trengrove [G]
08/24/2022, 9:09 PMHoist a state holder that has a function in it to scroll to the top. For example how LazyList does it
a
allan.conda
08/25/2022, 5:10 AMHoist a state holder that has a function in it to scroll to the top. For example how LazyList does itAh, that’s what I thought too, just a bit weird to hoist the lazyListState up to the root 😄. I have a feeling it would break the list state somehow too, but I could try a hoist separate state just for scrolling up. Currently we provide a Scroll event flow in a repository, but I don’t like that we have scroll events at that layer.
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