https://invisible-island.net/ncurses/Ada95
------------------------------------------------------------------------------ -- -- -- 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;