Ticker - Top Half

ticker_top_half.kt

@Composable
private fun TopHalf(
    modifier: Modifier = Modifier,
    content: @Composable () -> Unit,
) {
    // 1
    Layout(
        // 2
        modifier = modifier.clipToBounds(),
        content = content,
    ) { measurables, constraints ->
        require(measurables.size == 1) { "This composable expects a single child" }

        // 3
        val placeable = measurables.first().measure(constraints)
        // 4
        val height = placeable.height / 2

        // 5
        layout(
            width = placeable.width,
            height = height,
        ) {
            // 6
            placeable.placeRelative(
                x = 0,
                y = 0,
            )
        }
    }
}