1 // Copyright (C) 2007, 2008, 2009 Ben Asselstine
3 // This program is free software; you can redistribute it and/or modify
4 // it under the terms of the GNU General Public License as published by
5 // the Free Software Foundation; either version 3 of the License, or
6 // (at your option) any later version.
8 // This program is distributed in the hope that it will be useful,
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 // GNU Library General Public License for more details.
13 // You should have received a copy of the GNU General Public License
14 // along with this program; if not, write to the Free Software
15 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 #include <sigc++/trackable.h>
22 #include "LocationList.h"
27 //! A list of Bridge objects located on the game map.
29 * The bridgelist keeps track of the bridges located on the game map. It
30 * is implemented as a singleton because many classes use it for looking up
33 class Bridgelist : public LocationList<Bridge*>, public sigc::trackable
36 //! The xml tag of this object in a saved-game file.
37 static std::string d_tag;
39 // Methods that operate on the class data but do not modify the class.
41 //! Saves the list of Bridge objects to the opened saved-game file.
42 bool save(XML_Helper* helper) const;
44 //! Determines what the right Bridge::Type should be for the given tile.
46 * Scans the surrounding tiles to see which bridge picture fits best.
48 * @param tile The position on the game map to calculate a bridge type
51 * @return The Bridge::Type that makes the most sense for the given
54 int calculateType(Vector<int> t) const;
59 //! Return the singleton instance. Create a new one if needed.
60 static Bridgelist* getInstance();
62 //! Load the singleton instance from the opened saved-game file.
63 static Bridgelist* getInstance(XML_Helper* helper);
65 //! Explicitly delete the singleton instance.
66 static void deleteInstance();
69 //! Default constructor.
72 //! Loading constructor.
74 * Load the list of Bridge objects from the opened saved-game file.
76 * @param helper The opened saved-game file to load the Bridge objects
79 Bridgelist(XML_Helper* helper);
82 //! Callback for loading Bridge objects into the list of bridges.
83 bool load(std::string tag, XML_Helper* helper);
87 //! A static pointer for the singleton instance.
88 static Bridgelist* s_instance;