Geometry determine_child_geometry(const Widget &, const Part &) const;
void autosize_child(const Widget &, const Part &, Geometry &) const;
void reposition_child(Widget &, const Part &) const;
Geometry determine_child_geometry(const Widget &, const Part &) const;
void autosize_child(const Widget &, const Part &, Geometry &) const;
void reposition_child(Widget &, const Part &) const;