Compose Conditional Modifier extention

gistfile1.txt

fun Modifier.conditional(
    condition: Boolean,
    ifTrue: Modifier.() -> Modifier,
    ifFalse: (Modifier.() -> Modifier)? = null,
): Modifier {
    return if (condition) {
        then(ifTrue(Modifier))
    } else if (ifFalse != null) {
        then(ifFalse(Modifier))
    } else {
        this
    }
}

// Null conditoional modifier
fun <T> Modifier.nullConditional(
    argument: T?,
    ifNotNull: Modifier.(T) -> Modifier,
    ifNull: (Modifier.() -> Modifier)? = null,
): Modifier {
    return if (argument != null) {
        then(ifNotNull(Modifier, argument))
    } else if (ifNull != null) {
        then(ifNull(Modifier))
    } else {
        this
    }
}

// Usage

@Composable
fun ComplexModifierScene(
    nighttime: Boolean,
    torchon: Boolean,
    modifier: Modifier = Modifier
) {
    val backgroundColor = if (nighttime && torchon) {
        TorchLight
    } else if (!nighttime) {
        Sunlight
    } else {
        Night
    }

    val boxModifier = modifier
        .conditional(nighttime && torchon, {
            clip(CircleShape)
        })
        .fillMaxHeight()
        .aspectRatio(1f)
        .background(backgroundColor)
        .conditional(nighttime && torchon, {
            shadow(elevation = 4.dp, shape = CircleShape)
        })
        .conditional(nighttime && !torchon, {
            blur(20.dp)
        })

    Box(boxModifier) {
        Image(painterResource(R.drawable.outline_yard_24), "Scene", Modifier.fillMaxSize())
    }
}