Stabilise Compose Animations API

[arkivanov]

Docs: link. Collecting feedback and use cases here.

Points to improve:

• Get rid of Direction.IDLE using movableContentOf (blocked by Compose 1.2.0 release)
• Make click interception configurable? Or replace with another solution? See b/214231672
• Nullable StackAnimator in StackAnimation selector
• Shared element transitions (perhaps LookaheadLayout + movableContentOf should work out of the box when they land in Compose)
• Add otherChild argument to stackAnimation selector
• Add minAlpha argument to fade animation

[plusmobileapps]

It would be nice to have a shared element transition between configurations, not sure if something similar to this sample could be done with Decompose?

[arkivanov]

I have a pending branch that should make it compatible with the official shared transitions (LookaheadLayout + movableContentOf) when they land in Compose. The branch is blocked by the availability of movableContentOf. Waiting for the stable MPP Compose 1.2.0.

[arkivanov]

Actually, I found that LookaheadLayout is already available to try in Compose 1.3.0-alpha01. I will play with it and provide some updates here.

[arkivanov]

Yep, LookaheadLayout + movableContentOf should work just fine even with the current animations API. It is already available in Compose 1.3.0-alpha01, however there are immediate bugs, e.g. LookaheadLayout doesn't support having LazyColumn inside, etc.

Screen.Recording.2022-07-24.at.17.27.00.mov

[plusmobileapps]

It seems like the animation documentation is out of date since the stack navigation changes. I'm assuming childAnimation is supposed to be stackAnimation?

[arkivanov]

Thanks for raising! I updated the documentation a while ago with multiple rounds of self code review, but seems like I missed this one.

[aartikov]

@arkivanov Hi. Is it possible to use AnimatedContent with Decompose?

[arkivanov]

@aartikov Technically it should be possible. E.g. the Child Stack just exposes Value<ChildStack<C, T>> - so you can use something your own instead of the Children function, with AnimatedContent. You can also try the StackAnimation { } function that just provides the current ChildStack and it's up to you how to render children.

[aartikov]

@arkivanov Thank you!