An enumeration that describes the mode of an input device.
|0||Gdk::MODE_DISABLED||The device is disabled and will not report any events.|
|1||Gdk::MODE_SCREEN||The device is enabled. The device's coordinate space maps to the entire screen.|
|2||Gdk::MODE_WINDOW||The device is enabled. The device's coordinate space is mapped to a single window. The manner in which this window is chosen is undefined, but it will typically be the same way in which the focus window for key events is determined.|