utils.kt

@Composable
fun Float.dpToPx(): Float = with(LocalDensity.current) { this@dpToPx.dp.toPx() }

@Composable
fun Int.dpToPx(): Float = with(LocalDensity.current) { this@dpToPx.dp.toPx() }

val circleRadius = 12.dp.dpToPx()

fun <T> SnapshotStateList<T>.toggle(item: T) {
    if (contains(item)) remove(item) else add(item)
}
val selected = remember { mutableStateListOf<String>() }

Checkbox(
    checked = selected.contains("Banana"),
    onCheckedChange = { selected.toggle("Banana") }
)