-----------------------------------------------------------------------
--                               G P S                               --
--                                                                   --
--                        Copyright (C) 2002                         --
--                            ACT-Europe                             --
--                                                                   --
-- GPS is free  software;  you can redistribute it and/or modify  it --
-- under the terms of the GNU General Public License as published by --
-- the Free Software Foundation; either version 2 of the License, or --
-- (at your option) any later version.                               --
--                                                                   --
-- This program is  distributed in the hope that it will be  useful, --
-- but  WITHOUT ANY WARRANTY;  without even the  implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU --
-- General Public License for more details. You should have received --
-- a copy of the GNU General Public License along with this program; --
-- if not,  write to the  Free Software Foundation, Inc.,  59 Temple --
-- Place - Suite 330, Boston, MA 02111-1307, USA.                    --
-----------------------------------------------------------------------

--  This package provides visual utilities to handle differences between
--  files.

with Gtk.Widget;   use Gtk.Widget;
with Gtk.Clist;    use Gtk.Clist;
with Diff_Utils;   use Diff_Utils;
with Basic_Types;  use Basic_Types;
with Glide_Kernel;

package Vdiff_Utils is

   procedure Fill_Diff_Lists
     (Kernel : access Glide_Kernel.Kernel_Handle_Record'Class;
      List1  : access Gtk_Clist_Record'Class;
      List2  : access Gtk_Clist_Record'Class;
      File1  : String;
      File2  : String;
      Diff   : Diff_Occurrence_Link);
   --  Fill List1 and List2 with lines of File given a result of diff Diff.

   type Text_Iterator;

   type Text_Iterator_Access is access all Text_Iterator;

   type Text_Iterator is record
      New_Line, Old_Line : String_Access;
      Original_Position  : Natural;
      Action             : Diff_Action := Nothing;
      Color_Enabled      : Boolean := True;
      Next               : Text_Iterator_Access;
      File_Caption       : Boolean := False;
   end record;
   --  In this structure, Original_Position is the number of the line in the
   --  old text. If Action is Append, then New_Line should be null and
   --  Original_Position must be the number of the previous line in the old
   --  text. When  Action is Delete, New_Line should be null.

   procedure Free (This : in out Text_Iterator_Access);
   --  Free the memory associated to a Text_Iterator_Access, and all next
   --  objects linked to this one.

   procedure Fill_Diff_Lists
     (Kernel     : access Glide_Kernel.Kernel_Handle_Record'Class;
      List1      : access Gtk_Clist_Record'Class;
      List2      : access Gtk_Clist_Record'Class;
      First_Line : Text_Iterator_Access);
   --  Fill List1 and List2 with lines given from Next_Line.

   procedure Value1_Changed (Object : access Gtk_Widget_Record'Class);
   --  Callback for the value_changed signal on the first
   --  scrolled window (vertical scrollbar) of a Vdiff_Access.

   procedure Value2_Changed (Object : access Gtk_Widget_Record'Class);
   --  Callback for the value_changed signal on the second
   --  scrolled window (vertical scrollbar) of a Vdiff_Access.

   procedure H_Value1_Changed (Object : access Gtk_Widget_Record'Class);
   --  Callback for the value_changed signal on the first
   --  scrolled window (horizontal scrollbar) of a Vdiff_Access.

   procedure H_Value2_Changed (Object : access Gtk_Widget_Record'Class);
   --  Callback for the value_changed signal on the second
   --  scrolled window (horizontal scrollbar) of a Vdiff_Access.

end Vdiff_Utils;
