gtk/gtk.go
func ViewportNew(hadjustment, vadjustment *Adjustment) (*Viewport, error) {
	c := C.gtk_viewport_new(hadjustment.native(), vadjustment.native())
	if c == nil {
		return nil, nilPtrErr
	}
	return wrapViewport(glib.Take(unsafe.Pointer(c))), nil
}
func ViewportNew(hadjustment, vadjustment *Adjustment) (*Viewport, error) {
	c := C.gtk_viewport_new(hadjustment.native(), vadjustment.native())
	if c == nil {
		return nil, nilPtrErr
	}
	return wrapViewport(glib.Take(unsafe.Pointer(c))), nil
}
// ViewportNew() is a wrapper around gtk_viewport_new().