Shimmer Modifier

shimmer.kt

fun Modifier.shimmerEffect() = composed {
    val size = remember { mutableStateOf(IntSize(0, 0)) }
    val transition = rememberInfiniteTransition()
    val startOffsetX = transition.animateFloat(
        initialValue = -2 * size.value.width.toFloat(),
        targetValue = 2 * size.value.width.toFloat(),
        animationSpec = infiniteRepeatable(
            animation = tween(1000)
        )
    )
    background(
        brush = Brush.linearGradient(
            colors = listOf(
                Color(0xFFB8B5B5),
                Color(0xFF8F8B8B),
                Color(0xFFB8B5B5),
            ),
            start = Offset(startOffsetX.value, 0f),
            end = Offset(startOffsetX.value + size.value.width.toFloat(), size.value.height.toFloat())
        )
    ).onGloballyPositioned {
        size.value = it.size
    }
}