HeaderBarComposable.kt

@Composable
fun HeaderBarParallaxScroll() {
    val scrollState = rememberScrollState()
    Box {
        Column(
            modifier = Modifier
                .fillMaxWidth()
                .verticalScroll(scrollState),
        ) {
            Box(
                modifier = Modifier
                    .fillMaxWidth()
                    .height(500.dp)
                    .background(Color.White)
                    .graphicsLayer {
                        Log.e(
                            "scroll",
                            "${scrollState.value.toFloat()}, max = ${scrollState.maxValue}, ratio = ${(scrollState.value.toFloat() / scrollState.maxValue)}"
                        )
                        alpha = 1f - ((scrollState.value.toFloat() / scrollState.maxValue) * 1.5f)
                        translationY = 0.5f * scrollState.value
                    },
                contentAlignment = Alignment.Center
            ) {
                Image(
                    painterResource(id = R.drawable.ic_tiger),
                    contentDescription = "tiger parallax",
                    contentScale = ContentScale.Crop,
                    modifier = Modifier.fillMaxSize()
                )
            }
            Text(
                text = stringResource(R.string.dummy_text),
                modifier = Modifier.background(
                    Color.White
                ),
                style = TextStyle(
                    fontSize = 24.sp
                )
            )
        }

        Box(
            modifier = Modifier
                .alpha(min(1f, (scrollState.value.toFloat() / scrollState.maxValue) * 5f))
                .fillMaxWidth()
                .height(60.dp)
                .background(Color.Yellow),
            contentAlignment = Alignment.CenterStart
        ) {
            Text(
                text = "Header bar",
                modifier = Modifier.padding(horizontal = 16.dp),
                style = TextStyle(
                    fontSize = 24.sp,
                    fontWeight = FontWeight.W900,
                    color = Color.Black
                )
            )
        }
    }
}