--------------------------------------------------------------------------------
--                                                                            --
-- Copyright (C) 2004, RISC OS Ada Library (RASCAL) developers.               --
--                                                                            --
-- This library is free software; you can redistribute it and/or              --
-- modify it under the terms of the GNU Lesser General Public                 --
-- License as published by the Free Software Foundation; either               --
-- version 2.1 of the License, or (at your option) any later version.         --
--                                                                            --
-- This library 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           --
-- Lesser General Public License for more details.                            --
--                                                                            --
-- You should have received a copy of the GNU Lesser General Public           --
-- License along with this library; if not, write to the Free Software        --
-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA    --
--                                                                            --
--------------------------------------------------------------------------------

-- $Author$
-- $Date$
-- $Revision$

with RASCAL.Memory;     use RASCAL.Memory;

with Interfaces.C;      use Interfaces.C;
with Kernel;            use Kernel;


package body RASCAL.ToolboxScale is

   Toolbox_ObjectMiscOp : constant := 16#44EC6#;

   -- SWIs
   Scale_PostFilter   : constant := 16#82C01#;
   Scale_PreFilter    : constant := 16#82C02#;

   -- Reason Codes
   Scale_GetWindowID  : constant := 16#0#;
   Scale_SetValue     : constant := 16#1#;
   Scale_GetValue     : constant := 16#2#;
   Scale_SetBounds    : constant := 16#3#;
   Scale_GetBounds    : constant := 16#4#;
   Scale_SetTitle     : constant := 16#5#;
   Scale_GetTitle     : constant := 16#6#;

   --

   function Get_Title (Scale : Object_ID;
                       Flags : in System.Unsigned_Types.Unsigned := 0) return string is

      Register             : aliased Kernel.swi_regs;
      Error                : oserror_access;
      Buffer_Size          : integer;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(Scale);
      Register.R(2) := Scale_GetTitle;
      Register.R(3) := 0;
      Register.R(4) := 0;
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxScale.Get_Title: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
      Buffer_Size := integer(Register.R(4));

      declare
         Buffer : string(1..Buffer_Size);
      begin
         Register.R(0) := int(Unsigned_to_Int(Flags));
         Register.R(1) := int(Scale);
         Register.R(2) := Scale_GetTitle;
         Register.R(3) := Adr_To_Int(Buffer'Address);
         Register.R(4) := int(Buffer_Size);
         Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

         if Error /= null then
            pragma Debug(Report("ToolboxScale.Get_Title: " & To_Ada(Error.ErrMess)));
            OS.Raise_Error(Error);
         end if;
         return MemoryToString(Buffer'Address);
      end;
   end Get_Title;

   --

   procedure Set_Title (Scale : in Object_ID;
                        Title : in string;
                        Flags : in System.Unsigned_Types.Unsigned := 0) is

      Register     : aliased Kernel.swi_regs;
      Error        : oserror_access;
      Title_0      : string := Title & ASCII.NUL;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(Scale);
      Register.R(2) := Scale_SetTitle;
      Register.R(3) := Adr_To_Int(Title_0'Address);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxScale.Set_Title: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
   end Set_Title;

   --

   function Get_Window_ID (Scale : Object_ID;
                           Flags : in System.Unsigned_Types.Unsigned := 0) return Object_ID is

      Register             : aliased Kernel.swi_regs;
      Error                : oserror_access;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(Scale);
      Register.R(2) := Scale_GetWindowID;
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxScale.Get_Window_ID: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
      return Object_ID(Register.R(1));
   end Get_Window_ID;

   --

   function Get_Value (Scale : Object_ID;
                       Flags : in System.Unsigned_Types.Unsigned := 0) return integer is

      Register             : aliased Kernel.swi_regs;
      Error                : oserror_access;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(Scale);
      Register.R(2) := Scale_GetValue;
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxScale.Get_Value: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
      return integer(Register.R(0));
   end Get_Value;

   --

   procedure Set_Value (Scale : in Object_ID;
                        Value : in integer;
                        Flags : in System.Unsigned_Types.Unsigned := 0) is

      Register   : aliased Kernel.swi_regs;
      Error      : oserror_access;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(Scale);
      Register.R(2) := Scale_SetValue;
      Register.R(3) := int(Value);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxScale.Set_Value: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
   end Set_Value;

   --

   function Get_Bounds (Scale : Object_ID;
                        Flags : in System.Unsigned_Types.Unsigned := 0) return integer is

      Register             : aliased Kernel.swi_regs;
      Error                : oserror_access;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(Scale);
      Register.R(2) := Scale_GetBounds;
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxScale.Get_Bounds: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;

      if "And" (1,Flags) /=0 then
         return integer(Register.R(0));
      elsif "And" (2,Flags) /=0 then
         return integer(Register.R(1));
      else
         return integer(Register.R(2));
      end if;
   end Get_Bounds;

   --

   procedure Set_Bounds (Scale     : in Object_ID;
                        Bounds : in integer;
                        Flags     : in System.Unsigned_Types.Unsigned := 0) is

      Register   : aliased Kernel.swi_regs;
      Error      : oserror_access;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(Scale);
      Register.R(2) := Scale_SetBounds;
      Register.R(3) := int(Bounds);
      Register.R(4) := int(Bounds);
      Register.R(5) := int(Bounds);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxScale.Set_Value: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
   end Set_Bounds;

   --
   
end RASCAL.ToolboxScale;
