gdk:device-state (device window)

device -- a gdk:device object
window -- a gdk:window object

axes -- a list of double float numbers with the axes value
mask -- a value of the gdk:modifier-type flags, or nil

Gets the current state of a pointer device relative to the window. As a slave device coordinates are those of its master pointer. This function may not be called on devices of type :slave, unless there is an ongoing grab on them. See the gdk:device-grab function.