Compose中基于可用高度实现垂直滚动视图条件定位的最佳实践

我有一个支持垂直滚动的Column，其中组件可动态增删。需求是：组件未填满屏幕时，按钮固定在屏幕底部；组件填满屏幕时，按钮置于滚动Column的内容下方。我曾实现方案，但在内容高度接近屏幕高度的临界场景表现不佳，寻求更优实现方式。感谢帮助！

BoxWithConstraints {
    val screenHeight = constraints.maxHeight
    val contentHeight = remember { mutableStateOf(0) }
    val bottomLayoutHeight = remember { mutableStateOf(0) }

    Column(
        Modifier
            .fillMaxWidth()
            .verticalScroll(rememberScrollState())
            .onGloballyPositioned { coordinates ->
                contentHeight.value = coordinates.size.height
            }
            .padding(horizontal = Constants.HORIZONTAL_PADDING)
    ) {
        // Indefinite views here
        // ...

        // If content does not fit within the screen, place the button inside the scrollable column
        if (contentHeight.value + bottomLayoutHeight.value >= screenHeight) {
            Column(Modifier.onGloballyPositioned { bottomLayoutHeight.value = it.size.height }) {
                BottomLayout(viewModel)
            }
        }
    }
    // If content fits within the screen, place the button outside the scrollable column
    if (contentHeight.value + bottomLayoutHeight.value < screenHeight) {
        Column(Modifier
            .fillMaxSize()
            .padding(horizontal = Constants.HORIZONTAL_PADDING),
            verticalArrangement = Arrangement.Bottom
        ) {
            Column(Modifier.onGloballyPositioned { bottomLayoutHeight.value = it.size.height }) {
                BottomLayout(viewModel)
            }
        }
    }
}

更新
修改后的代码可完美适配临界场景！此前遗漏了计算底部布局高度并与内容高度相加，以此判断总高度是否超过屏幕高度！^^

内容的提问来源于stack exchange，提问作者Duddie