# File : terminal_interface-curses-forms-field_types-user-choice.adb

    ------------------------------------------------------------------------------
    --                                                                          --
    --                           GNAT ncurses Binding                           --
    --                                                                          --
    --          Terminal_Interface.Curses.Forms.Field_Types.User.Choice         --
    --                                                                          --
    --                                 B O D Y                                  --
    --                                                                          --
    ------------------------------------------------------------------------------
    -- Copyright 2020 Thomas E. Dickey                                          --
    -- Copyright 1999-2011,2014 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: 1.21 @
    --  @Date: 2020/02/02 23:34:34 @
    --  Binding Version 01.00
    ------------------------------------------------------------------------------
    with System.Address_To_Access_Conversions;
    with Terminal_Interface.Curses.Aux; use Terminal_Interface.Curses.Aux;

    package body Terminal_Interface.Curses.Forms.Field_Types.User.Choice is

       package Argument_Conversions is
          new System.Address_To_Access_Conversions (Argument);

       function Generic_Next (Fld : Field;
                              Usr : System.Address) return Curses_Bool
       is
          Result : Boolean;
          Udf    : constant User_Defined_Field_Type_With_Choice_Access :=
            User_Defined_Field_Type_With_Choice_Access
            (Argument_Access (Argument_Conversions.To_Pointer (Usr)).all.Typ);
       begin
          Result := Next (Fld, Udf.all);
          return Curses_Bool (Boolean'Pos (Result));
       end Generic_Next;

       function Generic_Prev (Fld : Field;
                              Usr : System.Address) return Curses_Bool
       is
          Result : Boolean;
          Udf    : constant User_Defined_Field_Type_With_Choice_Access :=
            User_Defined_Field_Type_With_Choice_Access
            (Argument_Access (Argument_Conversions.To_Pointer (Usr)).all.Typ);
       begin
          Result := Previous (Fld, Udf.all);
          return Curses_Bool (Boolean'Pos (Result));
       end Generic_Prev;

       --  -----------------------------------------------------------------------
       --
       function C_Generic_Choice return C_Field_Type
       is
          Res : Eti_Error;
          T   : C_Field_Type;
       begin
          if M_Generic_Choice = Null_Field_Type then
             T := New_Fieldtype (Generic_Field_Check'Access,
                                 Generic_Char_Check'Access);
             if T = Null_Field_Type then
                raise Form_Exception;
             else
                Res := Set_Fieldtype_Arg (T,
                                          Make_Arg'Access,
                                          Copy_Arg'Access,
                                          Free_Arg'Access);
                Eti_Exception (Res);

                Res := Set_Fieldtype_Choice (T,
                                             Generic_Next'Access,
                                             Generic_Prev'Access);
                Eti_Exception (Res);
             end if;
             M_Generic_Choice := T;
          end if;
          pragma Assert (M_Generic_Choice /= Null_Field_Type);
          return M_Generic_Choice;
       end C_Generic_Choice;

    end Terminal_Interface.Curses.Forms.Field_Types.User.Choice;