gtk-widget-translate-coordinates (src dst src-x src-y)

src -- a gtk-widget object
dest -- a gtk-widget object
src-x -- an integer with the x position relative to src
src-y -- an integer with the y position relative to src

False if either the widget was not realized, or there was no common ancestor. Otherwise the x position and the y position relative to dest.

Translate coordinates relative to the allocation of src to coordinates relative to the allocations of dest. In order to perform this operation, both widgets must be realized, and must share a common toplevel.