What’s the canonical way of automatically giving f...

# compose

[Manuel Unterhofer]

What’s the canonical way of automatically giving focus to an element that enters the composition within the same frame? I saw several examples online that suggest using a FocusRequester within a LaunchedEffect but I am worried that this would not reliably happen within the same frame because the coroutine behind LaunchedEffect might be scheduled too late?

[Loney Chou]

May I ask what frame are you referring to? Like, same frame with what.

[Loney Chou]

Anyway, the only way to manually request focus on a specific component is by using FocusRequester + Modifier.focusRequester or FocusRequesterModifierNode (experimental), and most of the time you would use the former. A FocusRequester needs to know where it is in order to search for a focusable target, and this is done during the composition phase (when updating the modifier of a LayoutNode). Considering not causing any weird issue, using XxxEffect should be the safest and fastest way, because they get executed right after the composition is ready (if I remember correctly).

[Loney Chou]

You may use DisposableEffect for it right. It gets executed on the spot, unlike LaunchedEffect which will somehow "schedule" the execution, it depends.

[Manuel Unterhofer]

Frame as in update of the UI, one update cycle that the user will see.

[Manuel Unterhofer]

Ah, I forgot that DisposableEffect has keys. That should solve it, thanks!

[Zach Klippenstein (he/him) [MOD]]

LaunchedEffect should work as well. The coroutines are scheduled at the same time as `DisposableEffect`s are ran, and so they will always be dispatched before the next frame’s input handling phase (which is the first thing the choreographer does)