Shimmer.kt

fun Modifier.shimmerEffect(): Modifier = composed {
    var size by remember {
        mutableStateOf(IntSize.Zero)
    }
    val transition = rememberInfiniteTransition()
    val startOffsetX by transition.animateFloat(
        initialValue = -2 * size.width.toFloat(),
        targetValue = 2 * size.width.toFloat(),
        animationSpec = infiniteRepeatable(
            animation = tween(2000)
        )
    )
    background(
        brush = Brush.linearGradient(
            colors = listOf(
                Color(0xB9B5B5),
                Color(0xDDFFFFFF),
                Color(0xC2C1C1),
            ),
            start = Offset(startOffsetX, 0f),
            end = Offset(startOffsetX + size.width.toFloat(), size.height.toFloat())
        )
    ).onGloballyPositioned {
        size = it.size
    }
}