gtk-tree-view-convert-widget-to-bin-window-coords (view x y)

view -- a gtk-tree-view widget
x -- an integer with the x coordinate relative to the widget
y -- an integer with the y coordinate relative to the widget

bx -- an integer with the bin window x coordinate
by -- an integer with the bin window y coordinate

Converts widget coordinates to coordinates for the bin window, see the function gtk-tree-view-bin-window.