Added the necessary code to handle switching language live at runtime (not yet accessible in a nice way from the user interface, this will need to come later)

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@7420 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/guiengine/abstract_state_manager.hpp

@@ -22,6 +22,8 @@
 
 #include <vector>
 #include <string>
+#include "guiengine/engine.hpp"
+#include "guiengine/screen.hpp"
 
 /**
   * \ingroup guiengine
@@ -116,6 +118,25 @@ namespace GUIEngine
         /** \brief to be called after e.g. a resolution switch */
         void reshowTopMostMenu();
         
+        template<typename T>
+        void hardResetAndGoToScreen()
+        {                        
+            if (m_game_mode != GAME) GUIEngine::getCurrentScreen()->tearDown();
+            m_menu_stack.clear();
+            
+            GUIEngine::clearScreenCache();
+            
+            T* instance = T::getInstance();
+            
+            m_menu_stack.push_back(instance->getName());
+            setGameState(MENU);
+            
+            switchToScreen(instance->getName().c_str());
+            getCurrentScreen()->init();
+            
+            onTopMostScreenChanged();
+        }
+        
         /*  ***********************************
          * methods to override in children *
          *********************************** */

src/guiengine/engine.cpp

@@ -719,6 +719,15 @@ namespace GUIEngine
     }   // cleanForGame
     
     // ------------------------------------------------------------------------
+    
+    void clearScreenCache()
+    {
+        g_loaded_screens.clearAndDeleteAll();
+        g_current_screen = NULL;
+    }
+    
+    // ------------------------------------------------------------------------
+    
     void switchToScreen(const char* screen_name)
     {    
         needsUpdate.clearWithoutDeleting();

src/guiengine/engine.hpp

@@ -148,6 +148,8 @@ namespace GUIEngine
       */
     inline AbstractStateManager*      getStateManager()  { return Private::g_state_manager;  }
     
+    void clearScreenCache();
+    
     /**
       * \precondition GUIEngine::init must have been called first
       * \return       the skin object used to render widgets

src/states_screens/main_menu_screen.cpp

@@ -133,6 +133,21 @@ void MainMenuScreen::eventCallback(Widget* widget, const std::string& name, cons
     
     if (selection == "network")
     {
+        delete translations;
+        static int cycle = 0;
+        cycle++;
+        if (cycle > 5) cycle = 1;
+        
+        if (cycle == 1) putenv("LANGUAGE=he");
+        if (cycle == 2) putenv("LANGUAGE=zh_CN");
+        if (cycle == 3) putenv("LANGUAGE=fr");
+        if (cycle == 4) putenv("LANGUAGE=ru");
+        if (cycle == 5) putenv("LANGUAGE=en");
+        
+        translations  = new Translations();
+        GUIEngine::getStateManager()->hardResetAndGoToScreen<MainMenuScreen>();
+        return;
+        
         FeatureUnlockedCutScene* scene = FeatureUnlockedCutScene::getInstance();
         
         static int i = 1;