Class
Common
```kotlin
enum class PointerEventPass
```
The enumeration of passes where `PointerInputChange` traverses up and down the UI tree.
PointerInputChanges traverse throw the hierarchy in the following passes:
1. `Initial`: Down the tree from ancestor to descendant.
2. `Main`: Up the tree from descendant to ancestor.
3. `Final`: Down the tree from ancestor to descendant.
These passes serve the following purposes:
1. Initial: Allows ancestors to consume aspects of `PointerInputChange` before descendants. This is where, for example, a scroller may block buttons from getting tapped by other fingers once scrolling has started.
2. Main: The primary pass where gesture filters should react to and consume aspects of `PointerInputChange`s. This is the primary path where descendants will interact with `PointerInputChange`s before parents. This allows for buttons to respond to a tap before a container of the bottom to respond to a tap.
3. Final: This pass is where children can learn what aspects of `PointerInputChange`s were consumed by parents during the `Main` pass. For example, this is how a button determines that it should no longer respond to fingers lifting off of it because a parent scroller has consumed movement in a `PointerInputChange`.