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Menu.H

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#ifndef _MENU_H
#define _MENU_H


#include <GL/glut.h>
#include <map>
#include <KeyBoard.H>
#include <ControlGroup.H>
#include <UserInterface.H>

namespace xchen
{

  class UI :: Menu
  {
      static map<MenuID, Menu*, less<int> > menuID2menu;

      static void nctrl_keyboard_cb(ConvertedKeyValue item_id, int x, int y);
      static void menu_cb(int item_id);      
  public:
      enum { max_items = 1000 };

      static Menu* GetMenu(MenuID menu_id)                              { return menuID2menu[menu_id]; }
  public:                                                                                                                       
      Menu(KeyBoard* kb,const string& nm="") : name(nm)                 { init_menu(kb); }
      virtual ~Menu()                                                   { glutDestroyMenu(menu_id); menuID2menu.erase(menu_id); }

      KeyBoard& GetKeyBoard()                                           { return *keyboard; }

      ItemID AddItem(string str, KeyEventCB cb, KeyValue k=0);                          
      ItemID AddGlobalItem(string str, KeyEventCB cb, KeyValue k=0);                    
      ItemID AddItem(string str, KeyEventCB cb, KeyValue k, ConvertedKeyValue k2);      
      void AddSubMenu(const string& doc_str, MenuID sub_menu_id);
      void AddSeparator(const string& str = " ")                         { AddItem(str, KeyBoard::null_cb); }

                                                                                                                                
      MenuID GetMenuID() const                                           { return menu_id; }
      void Attach(int button = GLUT_RIGHT_BUTTON);                       
      void Detach(int button = GLUT_RIGHT_BUTTON);                       
      
  protected:                                                             
      const string name;
      MenuID menu_id;
      int cur_item_id;

      vector<MenuID> submenus;
      
      KeyValue item2key[max_items];                                      // item event item-id --> key event key-id.
      KeyBoard* keyboard;                                                                                                       

      void init_menu(KeyBoard* kb);
      Menu(const Menu&)                                                 { }
      Menu& operator=(const Menu&)                                      { return *this; }

  };                                                                                                                                    

  inline UI :: ItemID UI :: Menu :: AddItem(string str, KeyEventCB cb, KeyValue k)
  { 
    return AddItem(str, cb, k, cur_item_id);
  }

  inline UI :: ItemID UI :: Menu :: AddGlobalItem(string str, KeyEventCB cb, KeyValue k)  
  { 
    return AddItem(str,cb,k,menu_id*max_items + cur_item_id);
  }

                                                                         
}
#endif

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