--------------------------------------------------------------------------------
--                                                                            --
-- 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.ToolboxFontDbox is

   -- SWIs
   Toolbox_ObjectMiscOp : constant := 16#44EC6#;

   FontDbox_ClassSWI    : constant := 16#82A00#;
   FontDbox_PostFilter  : constant := 16#82A01#;
   FontDbox_PreFilter   : constant := 16#82A02#;

   -- Reason Codes
   FontDbox_GetWindowId : constant := 16#0#;
   FontDbox_SetFont     : constant := 16#1#;
   FontDbox_GetFont     : constant := 16#2#;
   FontDbox_SetSize     : constant := 16#3#;
   FontDbox_GetSize     : constant := 16#4#;
   FontDbox_SetTryString: constant := 16#5#;
   FontDbox_GetTryString: constant := 16#6#;
   FontDbox_SetTitle    : constant := 16#7#;
   FontDbox_GetTitle    : constant := 16#8#;

   --

   function Get_Font (FontDbox : 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(FontDbox);
      Register.R(2) := FontDbox_GetFont;
      Register.R(3) := 0;
      Register.R(4) := 0;
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxFontDbox.Get_Font(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(FontDbox);
         Register.R(2) := FontDbox_GetFont;
         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("ToolboxFontDbox.Get_Font(II): " & To_Ada(Error.ErrMess)));
            OS.Raise_Error(Error);
         end if;

         return MemoryToString(Buffer'Address);
      end;
   end Get_Font;

   --

   procedure Set_Font (FontDbox : in Object_ID;
                       Font     : in string;
                       Flags    : in System.Unsigned_Types.Unsigned := 0) is

      Register  : aliased Kernel.swi_regs;
      Error     : oserror_access;
      Font_0    : string := Font & ASCII.NUL;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(FontDbox);
      Register.R(2) := FontDbox_SetFont;
      Register.R(3) := Adr_To_Int(Font_0'Address);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

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

   --

   procedure Get_Size (FontDbox : in Object_ID;
                       Height   : out integer;
                       Aspect   : out 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(FontDbox);
      Register.R(2) := FontDbox_GetSize;
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxFontDbox.Get_Size: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
      Height := integer(Register.R(0));
      Aspect := integer(Register.R(1));
   end Get_Size;

   --

   procedure Set_Size (FontDbox : in Object_ID;
                       Height   : in integer;
                       Aspect   : 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(FontDbox);
      Register.R(2) := FontDbox_SetSize;
      Register.R(3) := int(Height);
      Register.R(4) := int(Aspect);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

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

   --

   function Get_Title (FontDbox : 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(FontDbox);
      Register.R(2) := FontDbox_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("ToolboxFontDbox.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(FontDbox);
         Register.R(2) := FontDbox_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("ToolboxFontDbox.Get_Title(I): " & To_Ada(Error.ErrMess)));
            OS.Raise_Error(Error);
         end if;
         return MemoryToString(Buffer'Address);
      end;
   end Get_Title;

   --

   procedure Set_Title (FontDbox : 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(FontDbox);
      Register.R(2) := FontDbox_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("ToolboxFontDbox.Set_Title: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
   end Set_Title;

   --

   function Get_TryString (FontDbox : 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(FontDbox);
      Register.R(2) := FontDbox_GetTryString;
      Register.R(3) := 0;
      Register.R(4) := 0;
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxFontDbox.Get_TryString(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(FontDbox);
         Register.R(2) := FontDbox_GetTryString;
         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("ToolboxFontDbox.Get_TryString(I): " & To_Ada(Error.ErrMess)));
            OS.Raise_Error(Error);
         end if;
         return MemoryToString(Buffer'Address);
      end;
   end Get_TryString;

   --

   procedure Set_TryString (FontDbox : in Object_ID;
                            TryString: in string;
                            Flags    : in System.Unsigned_Types.Unsigned := 0) is

      Register       : aliased Kernel.swi_regs;
      Error          : oserror_access;
      TryString_0    : string := TryString & ASCII.NUL;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(FontDbox);
      Register.R(2) := FontDbox_SetTryString;
      Register.R(3) := Adr_To_Int(TryString_0'Address);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

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

   --

   function Get_Window_ID (FontDbox : in 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(FontDbox);
      Register.R(2) := FontDbox_GetWindowId;
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

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

      return Object_ID(Register.R(0));
   end Get_Window_ID;

   --

end RASCAL.ToolboxFontDbox;
