http://invisible-island.net/ncurses/Ada95



File : terminal_interface-curses-forms-field_types-user.ads


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--                           GNAT ncurses Binding                           --
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--               Terminal_Interface.Curses.Forms.Field_Types.User           --
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--                                 S P E C                                  --
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--  Author:  Juergen Pfeifer, 1996
--  Version Control:
--  @Revision: 1.15 @
--  @Date: 2011/03/19 12:27:21 @
--  Binding Version 01.00
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with Interfaces.C;

package Terminal_Interface.Curses.Forms.Field_Types.User is
   pragma Preelaborate (Terminal_Interface.Curses.Forms.Field_Types.User);
   subtype C_Int is Interfaces.C.int;

   type User_Defined_Field_Type is abstract new Field_Type with null record;
   --  This is the root of the mechanism we use to create field types in
   --  Ada95. You should your own type derive from this one and implement
   --  the Field_Check and Character_Check functions for your own type.

   type User_Defined_Field_Type_Access is access all
     User_Defined_Field_Type'Class;

   function Field_Check
     (Fld : Field;
      Typ : User_Defined_Field_Type) return Boolean
      is abstract;
   --  If True is returned, the field is considered valid, otherwise it is
   --  invalid.

   function Character_Check
     (Ch  : Character;
      Typ : User_Defined_Field_Type) return Boolean
      is abstract;
   --  If True is returned, the character is considered as valid for the
   --  field, otherwise as invalid.

   procedure Set_Field_Type (Fld : Field;
                             Typ : User_Defined_Field_Type);
   --  This should work for all types derived from User_Defined_Field_Type.
   --  No need to reimplement it for your derived type.

   --  +----------------------------------------------------------------------
   --  | Private Part.
   --  | Used by the Choice child package.
private
   function C_Generic_Type   return C_Field_Type;

   function Generic_Field_Check (Fld : Field;
                                 Usr : System.Address) return Curses_Bool;
   pragma Convention (C, Generic_Field_Check);
   --  This is the generic Field_Check_Function for the low-level fieldtype
   --  representing all the User_Defined_Field_Type derivatives. It routes
   --  the call to the Field_Check implementation for the type.

   function Generic_Char_Check (Ch  : C_Int;
                                Usr : System.Address) return Curses_Bool;
   pragma Convention (C, Generic_Char_Check);
   --  This is the generic Char_Check_Function for the low-level fieldtype
   --  representing all the User_Defined_Field_Type derivatives. It routes
   --  the call to the Character_Check implementation for the type.

end Terminal_Interface.Curses.Forms.Field_Types.User;