Android
```kotlin
@JvmDefaultWithCompatibility
public interface Vertical
```
Used to specify the vertical arrangement of the layout's children in layouts like
[SpatialColumn](/jetpack-compose/androidx.xr.compose/compose/composable-functions/SpatialColumn).
## Functions
arrange
```kotlin
public fun Density.arrange(totalSize: Int, sizes: IntArray, outPositions: IntArray)
```
Vertically places the layout children.
#### Parameters
| | |
| --- | --- |
| totalSize | Available space that can be occupied by the children, in pixels. |
| sizes | An array of sizes of all children, in pixels. |
| outPositions | An array of the size of `sizes` that returns the calculated positions. Position of each child is from the top edge of the parent to center of the child, in pixels. |