return location for x coordinate of the pointer location relative to the window origin, or NULL
return location for y coordinate of the pointer location relative & to the window origin, or NULL
the window under the mouse pointer, or NULL
Deprecated: Use Device.getWindowAtPosition instead.
2.2
Obtains the window underneath the mouse pointer, returning the location of the pointer in that window in win_x, win_y for screen. Returns NULL if the window under the mouse pointer is not known to GDK (for example, belongs to another application).