Is there a way to detect if your composable is being rendered as a Preview? Akin to `isInEditMode()`...

# compose-desktop

[David W]

Is there a way to detect if your composable is being rendered as a Preview? Akin to isInEditMode() from standard Android.

[olonho]

@alexey.tsvetkov wdyt?

[seb]

Not sure if it works on Desktop but for Jetpack Compose you can use https://developer.android.com/reference/kotlin/androidx/compose/ui/platform/package-summary#LocalInspectionMode()

[olonho]

it's Android-only at the moment, but see no reason not to have it on other platforms as well

[alexey.tsvetkov]

I wonder what’s your usecase? I don’t see a reason against it, but I have not thought anyone needs that before today 🙂
Also feel free to create an issue at https://github.com/JetBrains/compose-jb/issues

[David W]

I am not saying it's a good use-case, but I have a view that is using my service locator as part of rendering, and I suspect (am not sure) that this is causing the previewer to fail since it'd require the rest of the application running to instantiate that.

[David W]

This is for a hobby project so I'm playing looser with the rules than I would for a work application 🙂

[David W]

(deleted some irrelevant info, I had to restart IntelliJ to get the Previewer working again)

[David W]

Just confirmed via commenting out and back in that using my service locator while rendering causes previewing to fail.
All it's doing is resolving to a boolean, so I'd like to, in Preview mode, hardcode the boolean rather than using the SL.

[David W]

if (!modVariant.mod(SL.access).isEnabled(modVariant)) {
                SmolButton(
                    modifier = Modifier
                        .padding(top = 4.dp)
                        .align(Alignment.CenterHorizontally),
                    onClick = {
                        GlobalScope.launch { SL.access.enableModVariant(modVariant) }
                    }
                ) {
                    Text("Enable")
                }
            }

is the part that, when commented out, allows the Previewer to work.

[Alexander Kurasov[JB]]

I think you can create a @Preview wrapper for your actual Composable and pass the parameter from there. It looks simple and much more explicit