navigate menus using TAB and TAB+LSHIFT

git-svn-id: svn://svn.code.sf.net/p/actiongame/code/trunk/ac@2815 e016b1c5-ed68-44aa-a2f7-31cac88cffde

source/src/menus.cpp

@@ -586,7 +586,7 @@ COMMAND(menuitemkeyinput, ARG_4STR);
 COMMAND(menuitemcheckbox, ARG_3STR);
 
 
-bool menukey(int code, bool isdown, int unicode)
+bool menukey(int code, bool isdown, int unicode, SDLMod mod)
 {
     if(!curmenu) return false;
     int n = curmenu->items.length(), menusel = curmenu->menusel;
@@ -617,6 +617,11 @@ bool menukey(int code, bool isdown, int unicode)
                 menusel++;
                 break;
 
+            case SDLK_TAB:
+                if(mod & KMOD_LSHIFT) menusel--;
+                else menusel++;
+                break;
+
             case SDLK_1:
             case SDLK_2:
             case SDLK_3: