--------------------------------------------------------------------------------
--                                                                            --
-- 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 RASCAL.OS;         use RASCAL.OS;

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


package body RASCAL.ToolboxColourMenu is

   -- SWIs
   Toolbox_ObjectMiscOp        : constant := 16#44EC6#;
                               
   ColourMenu_ClassSWI         : constant := 16#82980#;
   ColourMenu_PostFilter       : constant := 16#82981#;
   ColourMenu_PreFilter        : constant := 16#82982#;

   -- Reason codes
   ColourMenu_SetColour        : constant := 16#0#;
   ColourMenu_GetColour        : constant := 16#1#;
   ColourMenu_SetNoneAvailable : constant := 16#2#;
   ColourMenu_GetNoneAvailable : constant := 16#3#;
   ColourMenu_SetTitle         : constant := 16#4#;
   ColourMenu_GetTitle         : constant := 16#5#;

   --

   function Get_Colour (ColourMenu : in Object_ID;
                        Flags      : in System.Unsigned_Types.Unsigned := 0) return Toolbox_Colour is

      Register : aliased Kernel.swi_regs;
      Error    : oserror_access;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(ColourMenu);
      Register.R(2) := ColourMenu_GetColour;

      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

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

   --

   function Get_Title (ColourMenu : in 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(ColourMenu);
      Register.R(2) := ColourMenu_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("ToolboxColourMenu.Get_Title(I): " & 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(ColourMenu);
         Register.R(2) := ColourMenu_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("ToolboxColourMenu.Get_Title(II): " & To_Ada(Error.ErrMess)));
            OS.Raise_Error(Error);
         end if;
         return MemoryToString(Buffer'Address);
      end;
   end Get_Title;

   --

   function Get_None_Available (ColourMenu : in Object_ID;
                                Flags      : in System.Unsigned_Types.Unsigned := 0) return boolean is

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

      if Error /= null then
         pragma Debug(Report("ToolboxColourMenu.Get_None_Available: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
      return "And"(1,int_to_unsigned(integer(Register.R(0))))=1;
   end Get_None_Available;

   --

   procedure Set_Colour (ColourMenu : in Object_ID;
                         Colour     : in Toolbox_Colour;
                         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(ColourMenu);
      Register.R(2) := ColourMenu_SetColour;
      Register.R(3) := int(integer(Colour));
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

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

   --

   procedure UnSet_Colour (ColourMenu : in Object_ID;
                           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(ColourMenu);
      Register.R(2) := ColourMenu_SetColour;
      Register.R(3) := -1;
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

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

   --

   procedure Set_None_Available (ColourMenu     : in Object_ID;
                                 None_Available : in boolean;
                                 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(ColourMenu);
      Register.R(2) := ColourMenu_SetNoneAvailable;
      Register.R(3) := boolean'Pos(None_Available);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

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

   --

   procedure Set_Title (FontMenu  : 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(FontMenu);
      Register.R(2) := ColourMenu_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("ToolboxFontMenu.Set_Title: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
   end Set_Title;

   --

end RASCAL.ToolboxColourMenu;
