--------------------------------------------------------------------------------
--                                                                            --
-- 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.OS;
with RASCAL.Utility;    use RASCAL.Utility;
with RASCAL.Memory;     use RASCAL.Memory;

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


package body RASCAL.ToolboxTabs is

   -- SWIs
   Toolbox_ObjectMiscOp : constant Interfaces.C.unsigned :=16#44EC6#;

   -- Reason codes
   Tabs_SetState        : constant := 16#402c#;
   Tabs_GetState        : constant := 16#402d#;
   Tabs_SetSelected     : constant := 16#402e#;
   Tabs_GetSelected     : constant := 16#402f#;
   Tabs_TabFromWindow   : constant := 16#4030#;
   Tabs_WindowFromTab   : constant := 16#4031#;
   Tabs_SetLabel        : constant := 16#4032#;
   Tabs_GetLabel        : constant := 16#4033#;

   --

   procedure Set_State (Window    : in Object_ID;
                        Component : in Component_ID;
                        State     : in System.Unsigned_Types.unsigned;
                        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(Window);
      Register.R(2) := Tabs_SetState;
      Register.R(3) := int(Component);
      Register.R(4) := int(Unsigned_to_Int(State));
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

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

   --

   function Get_State (Window    : in Object_ID;
                       Component : in Component_ID;
                       Flags     : in System.Unsigned_Types.unsigned := 0) return System.Unsigned_Types.unsigned is

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

      if Error /= null then
         pragma Debug(Report("ToolboxTabs.Get_State: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
         return 0;
      else
         return System.Unsigned_Types.unsigned(Register.R(0));
      end if;
   end Get_State;

   --

   procedure Set_Selected (Window    : in Object_ID;
                           Component : in Component_ID;
                           Index     : in out Natural;
                           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(Window);
      Register.R(2) := Tabs_SetSelected;
      Register.R(3) := int(Component);
      Register.R(4) := int(Index);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxTabs.Set_Selected: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
      end if;
      Index := Natural(Register.R(0));
   end Set_Selected;
   
   --

   function Get_Selected (Window    : in Object_ID;
                          Component : in Component_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(Window);
      Register.R(2) := Tabs_GetSelected;
      Register.R(3) := int(Component);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxTabs.Get_Selected: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
         return -1;
      else
         return integer(Register.R(0));
      end if;
   end Get_Selected;

   --

   function Get_WindowFromTab (Window    : in Object_ID;
                               Component : in Component_ID;
                               Index     : in Natural;
                               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(Window);
      Register.R(2) := Tabs_WindowFromTab;
      Register.R(3) := int(Component);
      Register.R(4) := int(Index);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxTabs.Get_WindowFromTab: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
         return -1;
      else
         return Object_ID(Register.R(0));
      end if;
   end Get_WindowFromTab;

   --

   function Get_TabFromWindow (Window    : in Object_ID;
                               Component : in Component_ID;
                               Tab_Window: in 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(Window);
      Register.R(2) := Tabs_TabFromWindow;
      Register.R(3) := int(Component);
      Register.R(4) := int(Tab_Window);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

      if Error /= null then
         pragma Debug(Report("ToolboxTabs.Get_TabFromWindow: " & To_Ada(Error.ErrMess)));
         OS.Raise_Error(Error);
         return -1;
      else
         return integer(Register.R(0));
      end if;
   end Get_TabFromWindow;

   --

   procedure Set_Label (Window    : in Object_ID;
                        Component : in Component_ID;
                        Index     : in Natural;
                        Text      : in String;
                        Flags     : in System.Unsigned_Types.unsigned := 0) is

      Text_0         : String := Text & ASCII.NUL;
      Register       : aliased Kernel.swi_regs;
      Error          : oserror_access;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(Window);
      Register.R(2) := Tabs_SetLabel;
      Register.R(3) := int(Component);
      Register.R(4) := int(Index);
      Register.R(4) := Adr_To_Int(Text_0'Address);
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

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

   function Get_Label (Window    : in Object_ID;
                       Component : in Component_ID;
                       Index     : in Natural;
                       Flags     : in System.Unsigned_Types.unsigned := 0) return String is

      Register       : aliased Kernel.swi_regs;
      Error          : oserror_access;
      Buffer_Size    : integer := 0;
   begin
      Register.R(0) := int(Unsigned_to_Int(Flags));
      Register.R(1) := int(Window);
      Register.R(2) := Tabs_GetLabel;
      Register.R(3) := int(Component);
      Register.R(4) := int(Index);
      Register.R(5) := 0;
      Register.R(6) := 0;
      Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

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

      Buffer_Size := integer(Register.R(6));

      declare
         Buffer : String(1..Buffer_Size + 1);
      begin
         Register.R(0) := int(Unsigned_to_Int(Flags));
         Register.R(1) := int(Window);
         Register.R(2) := Tabs_GetLabel;
         Register.R(3) := int(Component);
         Register.R(4) := int(Index);
         Register.R(5) := Adr_To_Int(Buffer'Address);
         Register.R(6) := int(Buffer_Size + 1);
         Error := Kernel.swi(Toolbox_ObjectMiscOp,Register'Access,Register'Access);

         if Error /= null then
            pragma Debug(Report("ToolboxTabs.Get_Label: " & To_Ada(Error.ErrMess)));
            OS.Raise_Error(Error);
         end if;
         return MemoryToString(Buffer'Address,0,integer(Register.R(6)));
      end;
   end Get_Label;

   --

end RASCAL.ToolboxTabs;
