An enumeration describing the type of an input device in general terms.
|0||Gdk::SOURCE_MOUSE||The device is a mouse. (This will be reported for the core pointer, even if it is something else, such as a trackball.)|
|1||Gdk::SOURCE_PEN||The device is a stylus of a graphics tablet or similar device.|
|2||Gdk::SOURCE_ERASER||The device is an eraser. Typically, this would be the other end of a stylus on a graphics tablet.|
|3||Gdk::SOURCE_CURSOR||The device is a graphics tablet "puck" or similar device.|