Any built-in way to determine if a

@Composable

is being presented in a

@Preview

or not? (Something in Locals?) I know it shouldn't care; but sometimes in the real world there are practical reasons. In this case the Coil SVG library is crashing in Previews for some class-loader related reason; I need some flag to suppress registering of the SVG handler in Previews so I can get on with building the rest of the View.

@Andrew Neal I don't think I need help using Coil - not sure how linking to that doco answers my question. Coil is already integrated and I'm using

LocalImageLoader

- Coils SVG renderer is just exhibiting an incompatibility with `Preview`s right now, and I need something like an

isRunningInPreviewMode

flag to suppress it.

You're looking for https://developer.android.com/reference/kotlin/androidx/compose/ui/platform/package-summary#LocalInspectionMode()

Thank you @Ian Lake 🎉

Are you not able to use a dummy

LocalImageLoader

in your preview to avoid loading the SVG?

Yeah, what Andrew is suggesting is providing your own

LocalImageLoader

specifically wrapping the components you want to preview that is essentially a no-op / has preview specific behavior. That way your component itself doesn't need to know about whether it is in a preview or not

Thanks, yes, that's close to what I'm intending 👍 - I'm already providing my own

LocalImageLoader

from a top-level

@Composable

scope and identified that it's enough to just not register the SVG handler during its configuration. The rest of Coil's

ImageLoader

isn't a problem, and no components need to be aware; SVG's just won't be handled.

I like your approach, I ended up conditionally setting a placeholder but I think I'll switch to your way. It seems worth raising a bug for SVG failing in previews.

fun rememberAstronautPainter(person: Assignment?) =
    rememberImagePainter(person?.personImageUrl) {
        // Use the generic astronaut SVG for missing or error (404?).
        fallback(R.drawable.ic_american_astronaut)
        error(R.drawable.ic_american_astronaut)

        if (LocalInspectionMode.current) {
            // Show error image instead of blank in @Preview
            placeholder(R.drawable.ic_american_astronaut)
        }
    }

Did you see the same issue as above with SVG in Preview, @yschimke?

No, but I have remote images which don't download in previews