IssueTracker

Jetpack Compose version: BOM 2024.05.00

Jetpack Compose component used: AnimatedVisibility

Android Studio Build: Jellyfish 2023.3.1 Patch 1

Kotlin version: 1.9.0

Steps to Reproduce or Code Sample to Reproduce:

AnimatedVisibility reverts to using a quick default animation in several cases. Our app displays a list of timers, so our content size may change as the timer ticks, and this is causing enter and exit animations to look weird. I've worked around this for now by using a fixed height, but this seems like an underlying problem in AnimatedVisibility where its internal state is getting reset.

To trigger this behavior, do 1 of the following while an animation is in progress:

1. Change content size.
2. Change visibility (such as go from visible to not-visible).

Desired Behavior

Instead of reverting to a default animation, I think it would look a lot better if AnimatedVisibility used my specified transitions instead of the default. Here's my ideal behavior for each of these cases:

1. If the content changes size, rerun the target size block, and continue the animation from its current point using the new target.
2. If visibility changes, continue the animation using 1 - timeRemaining from the current animation. So if we're 80% exited and the visible changes to true, start the enter animation at 20% already completed. Since enter/exit animation are usually symmetrical, I think this will probably look the best. I could also settle for running the enter animation for its full duration starting at the current position.

Video and Repo

In this video, I've created 3 animated Texts using a slow animation to demonstrate the issue. The first is plain text (blue), the 2nd is a timer with fixed height (blue), and the 3rd is a timer that changes height (red). As you can see, the height-changing timer finishes its enter animation almost immediately. Then, when I toggle visibility while animation is in progress, it uses the quick default animation. I've created a running example here:

https://github.com/distinctdan/compose-animated-visibility-bug