Suppose I am using a `ComposeView` to show a compo...
# composea
Alex
10/05/2021, 9:38 AMSuppose I am using a
ComposeViewComposeViewAlex
10/05/2021, 10:50 AMReceiving a callback when the content of the
ComposeViewr
raenardev
10/05/2021, 10:58 AMI think you can use
SideEffectSchedulehttps://developer.android.com/reference/kotlin/androidx/compose/runtime/package-summary#SideEffect(kotlin.Function0)to run when the current composition completes successfully and applies changes.effect
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Alex
10/05/2021, 11:37 AMBrillant, cheers!
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Adam Powell
10/05/2021, 1:28 PMWhy do you want this?
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Alex
10/07/2021, 9:35 AMWe have a blurring feature, implemented for Android < 12 as a custom view
Alex
10/07/2021, 9:35 AMI need to rell the blurring custom view when it should invalidate itself (e.g. when its content has changed in compose)
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Adam Powell
10/07/2021, 1:06 PMSideEffect won't be enough for you then as it only runs if that specific call to SideEffect was recomposed. Layout and drawing frequently change without recomposing.
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Alex
10/08/2021, 6:56 AMHm, what would be a way to achieve it in compose then?
We managed it inside of the custom blurring view now, skipping compose for that.
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Adam Powell
10/08/2021, 2:13 PMThis is all going to be lower level than compose for your purposes. ViewTreeObserver callbacks are likely to be the closest thing you can rely on from public API since compose UI will use multiple views internally; there's no single view you can extend or add callbacks to that would give you a complete picture or be guaranteed not to change view tree structure in a future update.
Adam Powell
10/08/2021, 2:16 PMIf you'd like to file a feature request describing the use case we can track it but it's not likely to be prioritized highly when ranked against other pending work to support other view integration features.
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