terminal_interface-curses-menus.ads

# File : terminal_interface-curses-menus.ads

    ------------------------------------------------------------------------------
    --                                                                          --
    --                           GNAT ncurses Binding                           --
    --                                                                          --
    --                      Terminal_Interface.Curses.Menu                      --
    --                                                                          --
    --                                 S P E C                                  --
    --                                                                          --
    ------------------------------------------------------------------------------
    -- Copyright (c) 1998-2009,2014 Free Software Foundation, Inc.              --
    --                                                                          --
    -- Permission is hereby granted, free of charge, to any person obtaining a  --
    -- copy of this software and associated documentation files (the            --
    -- "Software"), to deal in the Software without restriction, including      --
    -- without limitation the rights to use, copy, modify, merge, publish,      --
    -- distribute, distribute with modifications, sublicense, and/or sell       --
    -- copies of the Software, and to permit persons to whom the Software is    --
    -- furnished to do so, subject to the following conditions:                 --
    --                                                                          --
    -- The above copyright notice and this permission notice shall be included  --
    -- in all copies or substantial portions of the Software.                   --
    --                                                                          --
    -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  --
    -- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               --
    -- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   --
    -- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   --
    -- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    --
    -- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    --
    -- THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               --
    --                                                                          --
    -- Except as contained in this notice, the name(s) of the above copyright   --
    -- holders shall not be used in advertising or otherwise to promote the     --
    -- sale, use or other dealings in this Software without prior written       --
    -- authorization.                                                           --
    ------------------------------------------------------------------------------
    --  Author:  Juergen Pfeifer, 1996
    --  Version Control:
    --  @Revision: 1.31 @
    --  @Date: 2014/05/24 21:31:57 @
    --  Binding Version 01.00
    ------------------------------------------------------------------------------
    with System;
    with Ada.Characters.Latin_1;

    package Terminal_Interface.Curses.Menus is
       pragma Preelaborate (Terminal_Interface.Curses.Menus);
       pragma Linker_Options ("-lmenu" & Curses_Constants.DFT_ARG_SUFFIX);

       Space : Character renames Ada.Characters.Latin_1.Space;

       type Item is private;
       type Menu is private;

       ---------------------------
       --  Interface constants  --
       ---------------------------
       Null_Item : constant Item;
       Null_Menu : constant Menu;

       subtype Menu_Request_Code is Key_Code
         range (Key_Max + 1) .. (Key_Max + 17);

       --  The prefix M_ stands for "Menu Request"
       M_Left_Item       : constant Menu_Request_Code := Key_Max + 1;
       M_Right_Item      : constant Menu_Request_Code := Key_Max + 2;
       M_Up_Item         : constant Menu_Request_Code := Key_Max + 3;
       M_Down_Item       : constant Menu_Request_Code := Key_Max + 4;
       M_ScrollUp_Line   : constant Menu_Request_Code := Key_Max + 5;
       M_ScrollDown_Line : constant Menu_Request_Code := Key_Max + 6;
       M_ScrollDown_Page : constant Menu_Request_Code := Key_Max + 7;
       M_ScrollUp_Page   : constant Menu_Request_Code := Key_Max + 8;
       M_First_Item      : constant Menu_Request_Code := Key_Max + 9;
       M_Last_Item       : constant Menu_Request_Code := Key_Max + 10;
       M_Next_Item       : constant Menu_Request_Code := Key_Max + 11;
       M_Previous_Item   : constant Menu_Request_Code := Key_Max + 12;
       M_Toggle_Item     : constant Menu_Request_Code := Key_Max + 13;
       M_Clear_Pattern   : constant Menu_Request_Code := Key_Max + 14;
       M_Back_Pattern    : constant Menu_Request_Code := Key_Max + 15;
       M_Next_Match      : constant Menu_Request_Code := Key_Max + 16;
       M_Previous_Match  : constant Menu_Request_Code := Key_Max + 17;

       --  For those who like the old 'C' names for the request codes
       REQ_LEFT_ITEM     : Menu_Request_Code renames M_Left_Item;
       REQ_RIGHT_ITEM    : Menu_Request_Code renames M_Right_Item;
       REQ_UP_ITEM       : Menu_Request_Code renames M_Up_Item;
       REQ_DOWN_ITEM     : Menu_Request_Code renames M_Down_Item;
       REQ_SCR_ULINE     : Menu_Request_Code renames M_ScrollUp_Line;
       REQ_SCR_DLINE     : Menu_Request_Code renames M_ScrollDown_Line;
       REQ_SCR_DPAGE     : Menu_Request_Code renames M_ScrollDown_Page;
       REQ_SCR_UPAGE     : Menu_Request_Code renames M_ScrollUp_Page;
       REQ_FIRST_ITEM    : Menu_Request_Code renames M_First_Item;
       REQ_LAST_ITEM     : Menu_Request_Code renames M_Last_Item;
       REQ_NEXT_ITEM     : Menu_Request_Code renames M_Next_Item;
       REQ_PREV_ITEM     : Menu_Request_Code renames M_Previous_Item;
       REQ_TOGGLE_ITEM   : Menu_Request_Code renames M_Toggle_Item;
       REQ_CLEAR_PATTERN : Menu_Request_Code renames M_Clear_Pattern;
       REQ_BACK_PATTERN  : Menu_Request_Code renames M_Back_Pattern;
       REQ_NEXT_MATCH    : Menu_Request_Code renames M_Next_Match;
       REQ_PREV_MATCH    : Menu_Request_Code renames M_Previous_Match;

       procedure Request_Name (Key  : Menu_Request_Code;
                               Name : out String);

       function  Request_Name (Key : Menu_Request_Code) return String;
       --  Same as function

       ------------------
       --  Exceptions  --
       ------------------

       Menu_Exception : exception;
       --
       --  Menu options
       --
       type Menu_Option_Set is
          record
             One_Valued        : Boolean;
             Show_Descriptions : Boolean;
             Row_Major_Order   : Boolean;
             Ignore_Case       : Boolean;
             Show_Matches      : Boolean;
             Non_Cyclic        : Boolean;
          end record;
       pragma Convention (C_Pass_By_Copy, Menu_Option_Set);

       for Menu_Option_Set use
          record
             One_Valued        at 0 range Curses_Constants.O_ONEVALUE_First
               .. Curses_Constants.O_ONEVALUE_Last;
             Show_Descriptions at 0 range Curses_Constants.O_SHOWDESC_First
               .. Curses_Constants.O_SHOWDESC_Last;
             Row_Major_Order   at 0 range Curses_Constants.O_ROWMAJOR_First
               .. Curses_Constants.O_ROWMAJOR_Last;
             Ignore_Case       at 0 range Curses_Constants.O_IGNORECASE_First
               .. Curses_Constants.O_IGNORECASE_Last;
             Show_Matches      at 0 range Curses_Constants.O_SHOWMATCH_First
               .. Curses_Constants.O_SHOWMATCH_Last;
             Non_Cyclic        at 0 range Curses_Constants.O_NONCYCLIC_First
               .. Curses_Constants.O_NONCYCLIC_Last;
          end record;
       pragma Warnings (Off);
       for Menu_Option_Set'Size use Curses_Constants.Menu_Options_Size;
       pragma Warnings (On);

       function Default_Menu_Options return Menu_Option_Set;
       --  Initial default options for a menu.
       pragma Inline (Default_Menu_Options);
       --
       --  Item options
       --
       type Item_Option_Set is
          record
             Selectable : Boolean;
          end record;
       pragma Convention (C_Pass_By_Copy, Item_Option_Set);

       for Item_Option_Set use
          record
             Selectable at 0 range Curses_Constants.O_SELECTABLE_First
               ..  Curses_Constants.O_SELECTABLE_Last;
          end record;
       pragma Warnings (Off);
       for Item_Option_Set'Size use Curses_Constants.Item_Options_Size;
       pragma Warnings (On);

       function Default_Item_Options return Item_Option_Set;
       --  Initial default options for an item.
       pragma Inline (Default_Item_Options);

       --
       --  Item Array
       --
       type Item_Array is array (Positive range <>) of aliased Item;
       pragma Convention (C, Item_Array);

       type Item_Array_Access is access Item_Array;

       procedure Free (IA         : in out Item_Array_Access;
                       Free_Items : Boolean := False);
       --  Release the memory for an allocated item array
       --  If Free_Items is True, call Delete() for all the items in
       --  the array.

       --  |=====================================================================
       --  | Man page mitem_new.3x
       --  |=====================================================================

       --  #1A NAME="AFU_1"#2|
       function Create (Name        : String;
                        Description : String := "") return Item;
       --  AKA: new_item()
       --  Not inlined.

       --  #1A NAME="AFU_2"#2|
       function New_Item (Name        : String;
                          Description : String := "") return Item
         renames Create;
       --  AKA: new_item()

       --  #1A NAME="AFU_3"#2|
       procedure Delete (Itm : in out Item);
       --  AKA: free_item()
       --  Resets Itm to Null_Item

       --  |=====================================================================
       --  | Man page mitem_value.3x
       --  |=====================================================================

       --  #1A NAME="AFU_4"#2|
       procedure Set_Value (Itm   : Item;
                            Value : Boolean := True);
       --  AKA: set_item_value()
       pragma Inline (Set_Value);

       --  #1A NAME="AFU_5"#2|
       function Value (Itm : Item) return Boolean;
       --  AKA: item_value()
       pragma Inline (Value);

       --  |=====================================================================
       --  | Man page mitem_visible.3x
       --  |=====================================================================

       --  #1A NAME="AFU_6"#2|
       function Visible (Itm : Item) return Boolean;
       --  AKA: item_visible()
       pragma Inline (Visible);

       --  |=====================================================================
       --  | Man page mitem_opts.3x
       --  |=====================================================================

       --  #1A NAME="AFU_7"#2|
       procedure Set_Options (Itm     : Item;
                              Options : Item_Option_Set);
       --  AKA: set_item_opts()
       --  An overloaded Set_Options is defined later. Pragma Inline appears there

       --  #1A NAME="AFU_8"#2|
       procedure Switch_Options (Itm     : Item;
                                 Options : Item_Option_Set;
                                 On      : Boolean := True);
       --  AKA: item_opts_on()
       --  AKA: item_opts_off()
       --  An overloaded Switch_Options is defined later.
       --  Pragma Inline appears there

       --  #1A NAME="AFU_9"#2|
       procedure Get_Options (Itm     : Item;
                              Options : out Item_Option_Set);
       --  AKA: item_opts()

       --  #1A NAME="AFU_10"#2|
       function Get_Options (Itm : Item := Null_Item) return Item_Option_Set;
       --  AKA: item_opts()
       --  An overloaded Get_Options is defined later. Pragma Inline appears there

       --  |=====================================================================
       --  | Man page mitem_name.3x
       --  |=====================================================================

       --  #1A NAME="AFU_11"#2|
       procedure Name (Itm  : Item;
                       Name : out String);
       --  AKA: item_name()
       function  Name (Itm : Item) return String;
       --  AKA: item_name()
       --  Implemented as function
       pragma Inline (Name);

       --  #1A NAME="AFU_12"#2|
       procedure Description (Itm         : Item;
                              Description : out String);
       --  AKA: item_description();

       function  Description (Itm : Item) return String;
       --  AKA: item_description();
       --  Implemented as function
       pragma Inline (Description);

       --  |=====================================================================
       --  | Man page mitem_current.3x
       --  |=====================================================================

       --  #1A NAME="AFU_13"#2|
       procedure Set_Current (Men : Menu;
                              Itm : Item);
       --  AKA: set_current_item()
       pragma Inline (Set_Current);

       --  #1A NAME="AFU_14"#2|
       function Current (Men : Menu) return Item;
       --  AKA: current_item()
       pragma Inline (Current);

       --  #1A NAME="AFU_15"#2|
       procedure Set_Top_Row (Men  : Menu;
                              Line : Line_Position);
       --  AKA: set_top_row()
       pragma Inline (Set_Top_Row);

       --  #1A NAME="AFU_16"#2|
       function Top_Row (Men : Menu) return Line_Position;
       --  AKA: top_row()
       pragma Inline (Top_Row);

       --  #1A NAME="AFU_17"#2|
       function Get_Index (Itm : Item) return Positive;
       --  AKA: item_index()
       --  Please note that in this binding we start the numbering of items
       --  with 1. So this is number is one more than you get from the low
       --  level call.
       pragma Inline (Get_Index);

       --  |=====================================================================
       --  | Man page menu_post.3x
       --  |=====================================================================

       --  #1A NAME="AFU_18"#2|
       procedure Post (Men  : Menu;
                       Post : Boolean := True);
       --  AKA: post_menu()
       --  AKA: unpost_menu()
       pragma Inline (Post);

       --  |=====================================================================
       --  | Man page menu_opts.3x
       --  |=====================================================================

       --  #1A NAME="AFU_19"#2|
       procedure Set_Options (Men     : Menu;
                              Options : Menu_Option_Set);
       --  AKA: set_menu_opts()
       pragma Inline (Set_Options);

       --  #1A NAME="AFU_20"#2|
       procedure Switch_Options (Men     : Menu;
                                 Options : Menu_Option_Set;
                                 On      : Boolean := True);
       --  AKA: menu_opts_on()
       --  AKA: menu_opts_off()
       pragma Inline (Switch_Options);

       --  #1A NAME="AFU_21"#2|
       procedure Get_Options (Men     : Menu;
                              Options : out Menu_Option_Set);
       --  AKA: menu_opts()

       --  #1A NAME="AFU_22"#2|
       function Get_Options (Men : Menu := Null_Menu) return Menu_Option_Set;
       --  AKA: menu_opts()
       pragma Inline (Get_Options);

       --  |=====================================================================
       --  | Man page menu_win.3x
       --  |=====================================================================

       --  #1A NAME="AFU_23"#2|
       procedure Set_Window (Men : Menu;
                             Win : Window);
       --  AKA: set_menu_win()
       pragma Inline (Set_Window);

       --  #1A NAME="AFU_24"#2|
       function Get_Window (Men : Menu) return Window;
       --  AKA: menu_win()
       pragma Inline (Get_Window);

       --  #1A NAME="AFU_25"#2|
       procedure Set_Sub_Window (Men : Menu;
                                 Win : Window);
       --  AKA: set_menu_sub()
       pragma Inline (Set_Sub_Window);

       --  #1A NAME="AFU_26"#2|
       function Get_Sub_Window (Men : Menu) return Window;
       --  AKA: menu_sub()
       pragma Inline (Get_Sub_Window);

       --  #1A NAME="AFU_27"#2|
       procedure Scale (Men     : Menu;
                        Lines   : out Line_Count;
                        Columns : out Column_Count);
       --  AKA: scale_menu()
       pragma Inline (Scale);

       --  |=====================================================================
       --  | Man page menu_cursor.3x
       --  |=====================================================================

       --  #1A NAME="AFU_28"#2|
       procedure Position_Cursor (Men : Menu);
       --  AKA: pos_menu_cursor()
       pragma Inline (Position_Cursor);

       --  |=====================================================================
       --  | Man page menu_mark.3x
       --  |=====================================================================

       --  #1A NAME="AFU_29"#2|
       procedure Set_Mark (Men  : Menu;
                           Mark : String);
       --  AKA: set_menu_mark()
       pragma Inline (Set_Mark);

       --  #1A NAME="AFU_30"#2|
       procedure Mark (Men  : Menu;
                       Mark : out String);
       --  AKA: menu_mark()

       function  Mark (Men : Menu) return String;
       --  AKA: menu_mark()
       --  Implemented as function
       pragma Inline (Mark);

       --  |=====================================================================
       --  | Man page menu_attributes.3x
       --  |=====================================================================

       --  #1A NAME="AFU_31"#2|
       procedure Set_Foreground
         (Men   : Menu;
          Fore  : Character_Attribute_Set := Normal_Video;
          Color : Color_Pair := Color_Pair'First);
       --  AKA: set_menu_fore()
       pragma Inline (Set_Foreground);

       --  #1A NAME="AFU_32"#2|
       procedure Foreground (Men   : Menu;
                             Fore  : out Character_Attribute_Set);
       --  AKA: menu_fore()

       --  #1A NAME="AFU_33"#2|
       procedure Foreground (Men   : Menu;
                             Fore  : out Character_Attribute_Set;
                             Color : out Color_Pair);
       --  AKA: menu_fore()
       pragma Inline (Foreground);

       --  #1A NAME="AFU_34"#2|
       procedure Set_Background
         (Men   : Menu;
          Back  : Character_Attribute_Set := Normal_Video;
          Color : Color_Pair := Color_Pair'First);
       --  AKA: set_menu_back()
       pragma Inline (Set_Background);

       --  #1A NAME="AFU_35"#2|
       procedure Background (Men  : Menu;
                             Back : out Character_Attribute_Set);
       --  AKA: menu_back()
       --  #1A NAME="AFU_36"#2|

       procedure Background (Men   : Menu;
                             Back  : out Character_Attribute_Set;
                             Color : out Color_Pair);
       --  AKA: menu_back()
       pragma Inline (Background);

       --  #1A NAME="AFU_37"#2|
       procedure Set_Grey
         (Men   : Menu;
          Grey  : Character_Attribute_Set := Normal_Video;
          Color : Color_Pair := Color_Pair'First);
       --  AKA: set_menu_grey()
       pragma Inline (Set_Grey);

       --  #1A NAME="AFU_38"#2|
       procedure Grey (Men  : Menu;
                       Grey : out Character_Attribute_Set);
       --  AKA: menu_grey()

       --  #1A NAME="AFU_39"#2|
       procedure Grey
         (Men   : Menu;
          Grey  : out Character_Attribute_Set;
          Color : out Color_Pair);
       --  AKA: menu_grey()
       pragma Inline (Grey);

       --  #1A NAME="AFU_40"#2|
       procedure Set_Pad_Character (Men : Menu;
                                    Pad : Character := Space);
       --  AKA: set_menu_pad()
       pragma Inline (Set_Pad_Character);

       --  #1A NAME="AFU_41"#2|
       procedure Pad_Character (Men : Menu;
                                Pad : out Character);
       --  AKA: menu_pad()
       pragma Inline (Pad_Character);

       --  |=====================================================================
       --  | Man page menu_spacing.3x
       --  |=====================================================================

       --  #1A NAME="AFU_42"#2|
       procedure Set_Spacing (Men   : Menu;
                              Descr : Column_Position := 0;
                              Row   : Line_Position   := 0;
                              Col   : Column_Position := 0);
       --  AKA: set_menu_spacing()
       pragma Inline (Set_Spacing);

       --  #1A NAME="AFU_43"#2|
       procedure Spacing (Men   : Menu;
                          Descr : out Column_Position;
                          Row   : out Line_Position;
                          Col   : out Column_Position);
       --  AKA: menu_spacing()
       pragma Inline (Spacing);

       --  |=====================================================================
       --  | Man page menu_pattern.3x
       --  |=====================================================================

       --  #1A NAME="AFU_44"#2|
       function Set_Pattern (Men  : Menu;
                             Text : String) return Boolean;
       --  AKA: set_menu_pattern()
       --  Return TRUE if the pattern matches, FALSE otherwise
       pragma Inline (Set_Pattern);

       --  #1A NAME="AFU_45"#2|
       procedure Pattern (Men  : Menu;
                          Text : out String);
       --  AKA: menu_pattern()
       pragma Inline (Pattern);

       --  |=====================================================================
       --  | Man page menu_format.3x
       --  |=====================================================================

       --  #1A NAME="AFU_46"#2|
       procedure Set_Format (Men     : Menu;
                             Lines   : Line_Count;
                             Columns : Column_Count);
       --  Not implemented: 0 argument for Lines or Columns;
       --  instead use Format to get the current sizes
       --      The  default  format  is  16  rows,  1  column.    Calling
       --      set_menu_format  with a null menu pointer will change this
       --      default.  A zero row or column argument to set_menu_format
       --      is  interpreted  as  a  request  not to change the current
       --      value.
       --  AKA: set_menu_format()
       pragma Inline (Set_Format);

       --  #1A NAME="AFU_47"#2|
       procedure Format (Men     : Menu;
                         Lines   : out Line_Count;
                         Columns : out Column_Count);
       --  AKA: menu_format()
       pragma Inline (Format);

       --  |=====================================================================
       --  | Man page menu_hook.3x
       --  |=====================================================================

       type Menu_Hook_Function is access procedure (Men : Menu);
       pragma Convention (C, Menu_Hook_Function);

       --  #1A NAME="AFU_48"#2|
       procedure Set_Item_Init_Hook (Men  : Menu;
                                     Proc : Menu_Hook_Function);
       --  AKA: set_item_init()
       pragma Inline (Set_Item_Init_Hook);

       --  #1A NAME="AFU_49"#2|
       procedure Set_Item_Term_Hook (Men  : Menu;
                                     Proc : Menu_Hook_Function);
       --  AKA: set_item_term()
       pragma Inline (Set_Item_Term_Hook);

       --  #1A NAME="AFU_50"#2|
       procedure Set_Menu_Init_Hook (Men  : Menu;
                                     Proc : Menu_Hook_Function);
       --  AKA: set_menu_init()
       pragma Inline (Set_Menu_Init_Hook);

       --  #1A NAME="AFU_51"#2|
       procedure Set_Menu_Term_Hook (Men  : Menu;
                                     Proc : Menu_Hook_Function);
       --  AKA: set_menu_term()
       pragma Inline (Set_Menu_Term_Hook);

       --  #1A NAME="AFU_52"#2|
       function Get_Item_Init_Hook (Men : Menu) return Menu_Hook_Function;
       --  AKA: item_init()
       pragma Inline (Get_Item_Init_Hook);

       --  #1A NAME="AFU_53"#2|
       function Get_Item_Term_Hook (Men : Menu) return Menu_Hook_Function;
       --  AKA: item_term()
       pragma Inline (Get_Item_Term_Hook);

       --  #1A NAME="AFU_54"#2|
       function Get_Menu_Init_Hook (Men : Menu) return Menu_Hook_Function;
       --  AKA: menu_init()
       pragma Inline (Get_Menu_Init_Hook);

       --  #1A NAME="AFU_55"#2|
       function Get_Menu_Term_Hook (Men : Menu) return Menu_Hook_Function;
       --  AKA: menu_term()
       pragma Inline (Get_Menu_Term_Hook);

       --  |=====================================================================
       --  | Man page menu_items.3x
       --  |=====================================================================

       --  #1A NAME="AFU_56"#2|
       procedure Redefine (Men   : Menu;
                           Items : Item_Array_Access);
       --  AKA: set_menu_items()
       pragma Inline (Redefine);

       procedure Set_Items (Men   : Menu;
                            Items : Item_Array_Access) renames Redefine;
       --  pragma Inline (Set_Items);

       --  #1A NAME="AFU_57"#2|
       function Items (Men   : Menu;
                       Index : Positive) return Item;
       --  AKA: menu_items()
       pragma Inline (Items);

       --  #1A NAME="AFU_58"#2|
       function Item_Count (Men : Menu) return Natural;
       --  AKA: item_count()
       pragma Inline (Item_Count);

       --  |=====================================================================
       --  | Man page menu_new.3x
       --  |=====================================================================

       --  #1A NAME="AFU_59"#2|
       function Create (Items : Item_Array_Access) return Menu;
       --  AKA: new_menu()
       --  Not inlined

       function New_Menu (Items : Item_Array_Access) return Menu renames Create;

       --  #1A NAME="AFU_60"#2|
       procedure Delete (Men : in out Menu);
       --  AKA: free_menu()
       --  Reset Men to Null_Menu
       --  Not inlined

       --  |=====================================================================
       --  | Man page menu_driver.3x
       --  |=====================================================================

       type Driver_Result is (Menu_Ok,
                              Request_Denied,
                              Unknown_Request,
                              No_Match);

       --  #1A NAME="AFU_61"#2|
       function Driver (Men : Menu;
                        Key : Key_Code) return Driver_Result;
       --  AKA: menu_driver()
       --  Driver is not inlined

       --  #1A NAME="AFU_62"#2|
       --  Not Implemented: menu_request_name, menu_request_by_name
    -------------------------------------------------------------------------------
    private
       type Item   is new System.Storage_Elements.Integer_Address;
       type Menu   is new System.Storage_Elements.Integer_Address;

       Null_Item : constant Item := 0;
       Null_Menu : constant Menu := 0;

    end Terminal_Interface.Curses.Menus;