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+<PRE>
+<I>------------------------------------------------------------------------------</I>
+<I>-- --</I>
+<I>-- <A HREF="http://www.gnat.com">GNAT</A> ncurses Binding --</I>
+<I>-- --</I>
+<I>-- Terminal_Interface.Curses.Forms.Field_Types.User --</I>
+<I>-- --</I>
+<I>-- S P E C --</I>
+<I>-- --</I>
+<I>------------------------------------------------------------------------------</I>
+<I>-- Copyright (c) 1998 Free Software Foundation, Inc. --</I>
+<I>-- --</I>
+<I>-- Permission is hereby granted, free of charge, to any person obtaining a --</I>
+<I>-- copy of this software and associated documentation files (the --</I>
+<I>-- "Software"), to deal in the Software without restriction, including --</I>
+<I>-- without limitation the rights to use, copy, modify, merge, publish, --</I>
+<I>-- distribute, distribute with modifications, sublicense, and/or sell --</I>
+<I>-- copies of the Software, and to permit persons to whom the Software is --</I>
+<I>-- furnished to do so, subject to the following conditions: --</I>
+<I>-- --</I>
+<I>-- The above copyright notice and this permission notice shall be included --</I>
+<I>-- in all copies or substantial portions of the Software. --</I>
+<I>-- --</I>
+<I>-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS --</I>
+<I>-- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF --</I>
+<I>-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. --</I>
+<I>-- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, --</I>
+<I>-- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR --</I>
+<I>-- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR --</I>
+<I>-- THE USE OR OTHER DEALINGS IN THE SOFTWARE. --</I>
+<I>-- --</I>
+<I>-- Except as contained in this notice, the name(s) of the above copyright --</I>
+<I>-- holders shall not be used in advertising or otherwise to promote the --</I>
+<I>-- sale, use or other dealings in this Software without prior written --</I>
+<I>-- authorization. --</I>
+<I>------------------------------------------------------------------------------</I>
+<I>-- <A HREF="http://home.t-online.de/home/Juergen.Pfeifer">Jürgen Pfeifer</A>, Email: <A HREF="mailto:Juergen.Pfeifer@T-Online.de">Juergen.Pfeifer@T-Online.de</A> --</I>
+<I>-- Version Control:</I>
+<I>-- @Revision: 1.1 @</I>
+<I>------------------------------------------------------------------------------</I>
+<B>with</B> Ada.Unchecked_Deallocation;
+<B>with</B> Terminal_Interface.Curses.<A HREF="terminal_interface-curses-aux_s.html#32:35">Aux</A>;
+
+<B>package</B> Terminal_Interface.Curses.Forms.Field_Types.User <B>is</B>
+
+ type User_Defined_Field_Type <B>is</B> <B>abstract</B> <B>new</B> Field_Type <B>with</B> <B>null</B> <B>record</B>;
+ <I>-- This is the root of the mechanism we use to create field types in</I>
+ <I>-- Ada95. You should your own type derive from this one and implement</I>
+ <I>-- the Field_Check and Character_Check functions for your own type.</I>
+
+ type User_Defined_Field_Type_Access <B>is</B> <B>access</B> <B>all</B>
+ User_Defined_Field_Type'Class;
+
+ <B>function</B> Field_Check
+ (Fld : Field;
+ Typ : User_Defined_Field_Type) <B>return</B> Boolean
+ <B>is</B> <B>abstract</B>;
+ <I>-- If True is returned, the field is considered valid, otherwise it is</I>
+ <I>-- invalid.</I>
+
+ <B>function</B> Character_Check
+ (Ch : Character;
+ Typ : User_Defined_Field_Type) <B>return</B> Boolean
+ <B>is</B> <B>abstract</B>;
+ <I>-- If True is returned, the character is considered as valid for the</I>
+ <I>-- field, otherwise as invalid.</I>
+
+ <B>procedure</B> Set_Field_Type (Fld : <B>in</B> Field;
+ Typ : <B>in</B> User_Defined_Field_Type);
+ <I>-- This should work for all types derived from User_Defined_Field_Type.</I>
+ <I>-- No need to reimplement it for your derived type.</I>
+
+ <I>-- +----------------------------------------------------------------------</I>
+ <I>-- | Private Part.</I>
+ <I>-- | Used by the Choice child package.</I>
+<B>private</B>
+ <B>use</B> type Interfaces.C.Int;
+
+ <B>function</B> Generic_Field_Check (Fld : Field;
+ Usr : System.Address) <B>return</B> <A HREF="terminal_interface-curses-aux_s.html#36:12">C_Int</A>;
+ <B>pragma</B> Convention (C, Generic_Field_Check);
+ <I>-- This is the generic Field_Check_Function for the low-level fieldtype</I>
+ <I>-- representing all the User_Defined_Field_Type derivates. It routes</I>
+ <I>-- the call to the Field_Check implementation for the type.</I>
+
+ <B>function</B> Generic_Char_Check (Ch : <A HREF="terminal_interface-curses-aux_s.html#36:12">C_Int</A>;
+ Usr : System.Address) <B>return</B> <A HREF="terminal_interface-curses-aux_s.html#36:12">C_Int</A>;
+ <B>pragma</B> Convention (C, Generic_Char_Check);
+ <I>-- This is the generic Char_Check_Function for the low-level fieldtype</I>
+ <I>-- representing all the User_Defined_Field_Type derivates. It routes</I>
+ <I>-- the call to the Character_Check implementation for the type.</I>
+
+<B>end</B> Terminal_Interface.Curses.Forms.Field_Types.User;
+
+</PRE>
+
+<P><HR><P>
+<P>
+This is BETA software. The interface is subject to change without notice.<P>
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