How to achieve this layout in Jetpack Compose

问题

I'm trying to use the new Jetpack Compose UI framework, but i'm running into an issue. I'd like to achieve this layout, wich in xml is pretty easy to achieve:

But i can't figure out hou to make the vertical divider take up the available vertical space, without specifying a fixed height. This code that I've tried doesn't seem to work:

@Composable
fun ListItem(item: PlateUI.Plate) {
    Surface(
        modifier = Modifier.fillMaxWidth(),
        shape = RoundedCornerShape(8.dp),
        elevation = 2.dp
    ) {
        Row(
            modifier = Modifier.fillMaxWidth(),
            verticalAlignment = Alignment.CenterVertically
        ) {
            Column(
                modifier = Modifier
                    .padding(8.dp),
                horizontalAlignment = Alignment.CenterHorizontally
            ) {
                Text(text = "Code")
                Text(text = item.code)
            }
            Spacer(
                modifier = Modifier
                    .preferredWidth(1.dp)
                    .background(color = MaterialTheme.colors.onSurface.copy(0.12f))
            )
            Spacer(modifier = Modifier.weight(1f))
            Text(
                modifier = Modifier
                    .padding(horizontal = 8.dp, vertical = 34.dp),
                text = item.name
            )
            Spacer(modifier = Modifier.weight(1f))
        }
    }
}

I keep getting this result:

I also tried with ConstraintLayout, but it still didn't work

@Composable
fun ListItem(item: PlateUI.Plate) {
    Surface(
        modifier = Modifier.fillMaxWidth(),
        shape = RoundedCornerShape(8.dp),
        elevation = 2.dp
    ) {
        ConstraintLayout(
            modifier = Modifier.fillMaxWidth(),
        ) {
            val(column, divider, text) = createRefs()
            Column(
                modifier = Modifier
                    .padding(8.dp)
                    .constrainAs(column){
                        top.linkTo(parent.top)
                        bottom.linkTo(parent.bottom)
                        start.linkTo(parent.start)
                    },
                horizontalAlignment = Alignment.CenterHorizontally
            ) {
                Text(text = "Code")
                Text(text = item.code)
            }
            Spacer(
                modifier = Modifier
                    .preferredWidth(1.dp)
                    .background(color = MaterialTheme.colors.onSurface.copy(0.12f))
                    .constrainAs(divider){
                        top.linkTo(parent.top)
                        bottom.linkTo(parent.bottom)
                        start.linkTo(column.end)
                    }
            )
            Text(
                modifier = Modifier
                    .padding(horizontal = 8.dp, vertical = 34.dp)
                    .constrainAs(text){
                        start.linkTo(divider.end)
                        end.linkTo(parent.end)
                        top.linkTo(parent.top)
                        bottom.linkTo(parent.bottom)
                    },
                text = item.name
            )
        }
    }
}

But nothing seems to work. Is this a bug, a missing feature or am i just missing something?

EDIT: Apparently the real problem is that the divider doesn't know how to measure when the Surface doesn't have a fixed height, setting height equal to some number solves the issue, but then the view doesn't adapt to the content height anymore, so this can't be the solution

回答1:

You can use the Modifier.fillMaxHeight().

Something like:

    Spacer(
            modifier = Modifier
                    .preferredWidth(1.dp)
                    .fillMaxHeight()
                    .background(color = MaterialTheme.colors.onSurface.copy(0.12f))
    )

回答2:

I've solved it using constraint layout:

Box(modifier = Modifier.padding(Dp(50f))) {
    ConstraintLayout(
        modifier = Modifier
            .border(width = Dp(1f), color = Color.Black)
            .fillMaxWidth()
    ) {
        val (left, divider, right) = createRefs()
        Column(
            modifier = Modifier
                .padding(horizontal = Dp(20f))
                .constrainAs(left) {
                    width = Dimension.wrapContent
                    start.linkTo(parent.start)
                    top.linkTo(parent.top)
                    end.linkTo(divider.start)
                    bottom.linkTo(parent.bottom)
                }
        ) {
            Text(text = "Code")
            Text(text = "A12")
        }
        Box(
            modifier = Modifier
                .width(Dp(1f))
                .background(Color.Black)
                .constrainAs(divider) {
                    width = Dimension.wrapContent
                    height = Dimension.fillToConstraints
                    start.linkTo(left.end)
                    top.linkTo(parent.top)
                    end.linkTo(right.start)
                    bottom.linkTo(parent.bottom)
                }
        )
        Box(
            modifier = Modifier
                .constrainAs(right) {
                    width = Dimension.fillToConstraints
                    start.linkTo(divider.end)
                    top.linkTo(parent.top)
                    end.linkTo(parent.end)
                    bottom.linkTo(parent.bottom)
                }
        ) {
            Text(
                text = "Test",
                modifier = Modifier
                    .padding(vertical = Dp(100f))
                    .align(Alignment.Center)
            )
        }
    }
}

The key part is using that modifier height = Dimension.fillToConstraints

来源：https://stackoverflow.com/questions/64043704/how-to-achieve-this-layout-in-jetpack-compose