I have a custom layout where I have something like ```MyLayo

Question

I have a custom layout where I have something like ```MyLayout slot = visible gt AnimatedVisibility visible ``` and the logic is such that I want that `visible` to be calculated based on available height and slot size I measure my slot then if it fits I pass visibility = `true` otherwise `false` I wanted to use `SubcomposeLayout` for this but turns out that to calculate `visible` I need to `subcompose measure` that slot and to `subcompose measure` it I need to calculate `visible` chicken egg Is this possible Inner State + recompose

Adam Powell · Answer

No you ve created an infinite data dependency loop You need the measured size of your content to decide the parameter to pass to generate that content to measure Don t do that slightly smiling face

dimsuz · Answer

Yeah seems like it How would I solve this though I have an animated visibility of content which I want to determine based on the layout size Use case zoom buttons on the map aka Google Maps If non modal bottom sheet opens and insets content so that zoom buttons do not fit I d like to fade them away After it hides fade them back in

Adam Powell · Answer

so you have a single element the container for the zoom buttons that you would like to disappear when there isn t enough space available to show them That s doable at the layout phase when the right information is available If you use `Layout` or `Modifier layout` you can choose not to place an element and it will not appear

Adam Powell · Answer

as for the animation that gets into questions of desired UX and you may want to start such an animation before the available space is known During placement you can ` placeWithLayer` to set an alpha value for the placeable

Adam Powell · Answer

a useful thought experiment for how to implement this for your use case is to consider what should happen if the available space immediately changes such that there isn t enough available to show the zoom buttons There isn t time to animate before something doesn t fit How does it behave and why

dimsuz · Answer

Yeah I basically have 3 button sections top bottom and middle Zoom controls are in the middle and only they should be animated supposedly My custom layout currently does exactly what you ve said in message 1 doesn t place them without animation I didn t know about `placeWithLayer` will check it out And I ll also run the thought experiment thanks

Adam Powell · Answer

If you re okay with awkward placement clipping during the animation sometimes then that s one avenue if not you ll want to think through what your animation signals really are For example you might want to have the animation be orthogonal to the placement of the buttons you might want to animate the alpha of the buttons based on something else happening in the UI that also incidentally changes the size available via an animation and the placement is more of a backstop

dimsuz · Answer

Oh all nice points Thank you for summing up clarifying