Describes the layer of a component
These enumerated "layer values" are used when determining which UI rendering layer a component is drawn into, which can help in making determinations of when components occlude one another.
Value | Symbolic name | Description |
| 0 | Atk::LAYER_INVALID | The object does not have a layer |
| 1 | Atk::LAYER_BACKGROUND | This layer is reserved for the desktop background |
| 2 | Atk::LAYER_CANVAS | This layer is used for Canvas components |
| 3 | Atk::LAYER_WIDGET | This layer is normally used for components |
| 4 | Atk::LAYER_MDI | This layer is used for layered components |
| 5 | Atk::LAYER_POPUP | This layer is used for popup components, such as menus |
| 6 | Atk::LAYER_OVERLAY | This layer is reserved for future use. |
| 7 | Atk::LAYER_WINDOW | This layer is used for toplevel windows. |