Specifies the crossing mode for GdkEventCrossing.
Value | Symbolic name | Description |
| 0 | Gdk::CROSSING_NORMAL | Crossing because of pointer motion. |
| 1 | Gdk::CROSSING_GRAB | Crossing because a grab is activated. |
| 2 | Gdk::CROSSING_UNGRAB | Crossing because a grab is deactivated. |