void removeBlockItem(BoxItem* item);
void createConnectionItem(InterfaceItem* iface1, InterfaceItem* iface2);
ConnectionItem* searchConnectionItem(InterfaceItem* iface1, InterfaceItem* iface2);
void removeBlockItem(BoxItem* item);
void createConnectionItem(InterfaceItem* iface1, InterfaceItem* iface2);
ConnectionItem* searchConnectionItem(InterfaceItem* iface1, InterfaceItem* iface2);