PopupContainer
void (*PopupContainerPositionFunc) (PopupContainer *cont, gint *out_x, gint *out_y);
PopupContainer *cont
gint *out_x
gint *out_y
GtkWidget * popup_container_new (GtkWidget *position_widget);
GtkWidget *position_widget
GtkWidget * popup_container_new_with_func (PopupContainerPositionFunc pos_func);
PopupContainerPositionFunc pos_func
#define POPUP_CONTAINER_TYPE (popup_container_get_type())