Returned by pointer_grab and keyboard_grab to indicate success or the reason for the failure of the grab attempt.
|0||Gdk::GRAB_SUCCESS||The resource was successfully grabbed.|
|1||Gdk::GRAB_ALREADY_GRABBED||The resource is actively grabbed by another client.|
|2||Gdk::GRAB_INVALID_TIME||The resource was grabbed more recently than the specified time.|
|3||Gdk::GRAB_NOT_VIEWABLE||The grab window or the confine_to window are not viewable.|
|4||Gdk::GRAB_FROZEN||The resource is frozen by an active grab of another client.|