gtk:popover-position (object)

object -- a gtk:popover widget
position -- a gtk:position-type value for the preferred popover position

The accessor for the position slot of the gtk:popover class gets or sets the preferred position of the popover to appear. If the popover is currently visible, it will be immediately updated.

This preference will be respected where possible, although on lack of space, for example, if close to the window edges, the gtk:popover widget may choose to appear on the opposite side.