Any way to know if a modifier has been removed? like `DisposableEffect` but for modifiers. I am imp...

# compose

[Alex Styl]

Any way to know if a modifier has been removed? like DisposableEffect but for modifiers.

I am implementing a Drag and Drop Modifier and I am keeping track of each target's coordinates in an object. I would like to delete those coords/'unregister' them when the composable is no longer in the composition

[Alex Styl]

I think I can do this via Modifier.composed{}. just spotted

[Louis Pullen-Freilich [G]]

composed is generally discouraged. If you are using modifier.node APIs you can use onDetach to manage logic here. Or you could just make your modifier factory function @Composable, and add DisposableEffect there

[Alex Styl]

why is composed discouraged? marking my modifier with @Composable felt like a code smell to me

[Louis Pullen-Freilich [G]]

https://developer.android.com/develop/ui/compose/custom-modifiers#create_a_custom_modifier_using_a_composable_modifier_factory

Current guidance. composed is expensive and bad for performance mainly

[Louis Pullen-Freilich [G]]

In any case making a modifier node implementation is probably the best thing here

[Alex Styl]

thanks for the link. i think u are right

[Alex Styl]

will mark with Composable for now. too little time to understand the nodes api rn