Parallax Scroll Effect in Jetpack Compose: Multi-layer Headers

Parallax scrolling creates depth by moving background and foreground elements at different speeds.

Detecting Scroll Offset

val scrollState = rememberScrollState()

LazyColumn(state = scrollState) {
    item {
        val offset = (scrollState.value / 3).toFloat()
        ParallaxHeader(offset = offset)
    }
    items(100) { index ->
        Text("Item $index", modifier = Modifier.padding(16.dp))
    }
}

Parallax Header Implementation

@Composable
fun ParallaxHeader(offset: Float) {
    Box(
        modifier = Modifier
            .fillMaxWidth()
            .height(250.dp)
            .graphicsLayer {
                translationY = -offset
            }
            .background(
                brush = Brush.verticalGradient(
                    colors = listOf(Color.Blue, Color.Cyan)
                )
            )
    )
}

Scroll Aware Transformation

val collapseFraction = (scrollState.value / 500f).coerceIn(0f, 1f)
Box(
    modifier = Modifier
        .height(250.dp * (1 - collapseFraction))
        .graphicsLayer {
            alpha = 1f - collapseFraction
        }
)

Parallax effects enhance visual depth and create engaging scrolling experiences that delight users.

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