gdk:window-pointer (window)

window -- a gdk:window object

win -- a gdk:window object containing the pointer as with the gdk:window-at-pointer function, or nil if the window containing the pointer is not known to GDK
x -- an integer for the x coordinate of pointer
y -- an integer for the y coordinate of pointer
mask -- a gdk:modifier-type value for the modifier mask

Obtains the current pointer position and modifier state. The position is given in coordinates relative to the upper left corner of window. The gdk:window-pointer function has been deprecated since version 3.0 and should not be used in newly written code. Use the gdk:window-device-position function instead.