return location for the X coordinate of the device location, relative to the window origin, or NULL. out[allow-none]
return location for the Y coordinate of the device location, relative to the window origin, or NULL. out[allow-none]
the GdkWindow under the device position, or NULL. [transfer none] Since 3.0
Obtains the window underneath device, returning the location of the device in win_x and win_y. Returns NULL if the window tree under device is not known to GDK (for example, belongs to another application). As a slave device coordinates are those of its master pointer, This function may not be called on devices of type GDK_DEVICE_TYPE_SLAVE, unless there is an ongoing grab on them, see gdk_device_grab().