File: gtk-color_selection.adb

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-----------------------------------------------------------------------
--               GtkAda - Ada95 binding for Gtk+/Gnome               --
--                                                                   --
--   Copyright (C) 1998-2000 E. Briot, J. Brobecker and A. Charlet   --
--                Copyright (C) 2000-2006 AdaCore                    --
--                                                                   --
-- This library 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 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 --
-- General Public License for more details.                          --
--                                                                   --
-- You should have received a copy of the GNU 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.                                       --
--                                                                   --
-----------------------------------------------------------------------

with Ada.Unchecked_Conversion;
with System;
with Gdk.Color;            use Gdk.Color;
with Interfaces.C.Strings; use Interfaces.C.Strings;

package body Gtk.Color_Selection is

   Global_Palette_With_Screen_Hook :
     Gtk_Color_Selection_Change_Palette_With_Screen_Func := null;

   procedure Palette_Hook_Proxy
     (Screen : Gdk_Screen; Colors : System.Address; N_Colors : Gint);
   pragma Convention (C, Palette_Hook_Proxy);
   --  Proxy for the Palette_With_Screen_Hook

   type Big_Color_Array is array (Natural) of Gdk_Color;
   pragma Convention (C, Big_Color_Array);
   type Big_Color_Array_Access is access Big_Color_Array;

   function Convert is new Ada.Unchecked_Conversion
     (System.Address, Big_Color_Array_Access);

   ---------------
   -- Get_Color --
   ---------------

   procedure Get_Color
     (Colorsel : access Gtk_Color_Selection_Record;
      Color    : out Color_Array)
   is
      procedure Internal (Colorsel : System.Address; Color : out Color_Array);
      pragma Import (C, Internal, "gtk_color_selection_get_color");

   begin
      Color (Opacity) := 0.0;
      Internal (Get_Object (Colorsel), Color);
   end Get_Color;

   -------------
   -- Gtk_New --
   -------------

   procedure Gtk_New (Widget : out Gtk_Color_Selection) is
   begin
      Widget := new Gtk_Color_Selection_Record;
      Gtk.Color_Selection.Initialize (Widget);
   end Gtk_New;

   ----------------
   -- Initialize --
   ----------------

   procedure Initialize (Widget : access Gtk_Color_Selection_Record'Class) is
      function Internal return System.Address;
      pragma Import (C, Internal, "gtk_color_selection_new");
   begin
      Set_Object (Widget, Internal);
   end Initialize;

   ------------------
   -- Is_Adjusting --
   ------------------

   function Is_Adjusting
     (Colorsel : access Gtk_Color_Selection_Record) return Boolean
   is
      function Internal (Colorsel : System.Address) return Gboolean;
      pragma Import (C, Internal, "gtk_color_selection_is_adjusting");

   begin
      return Internal (Get_Object (Colorsel)) /= 0;
   end Is_Adjusting;

   ---------------
   -- Set_Color --
   ---------------

   procedure Set_Color
     (Colorsel : access Gtk_Color_Selection_Record;
      Color    : Color_Array)
   is
      procedure Internal (Colorsel : System.Address; Color : System.Address);
      pragma Import (C, Internal, "gtk_color_selection_set_color");

   begin
      Internal (Get_Object (Colorsel), Color'Address);
   end Set_Color;

   -----------------------
   -- Set_Update_Policy --
   -----------------------

   procedure Set_Update_Policy
     (Colorsel : access Gtk_Color_Selection_Record;
      Policy   : Enums.Gtk_Update_Type)
   is
      procedure Internal
        (Colorsel : System.Address; Policy : Enums.Gtk_Update_Type);
      pragma Import (C, Internal, "gtk_color_selection_set_update_policy");

   begin
      Internal (Get_Object (Colorsel), Policy);
   end Set_Update_Policy;

   -----------------------------
   -- Get_Has_Opacity_Control --
   -----------------------------

   function Get_Has_Opacity_Control
     (Colorsel : access Gtk_Color_Selection_Record) return Boolean
   is
      function Internal (Colorsel : System.Address) return Gboolean;
      pragma Import
        (C, Internal, "gtk_color_selection_get_has_opacity_control");
   begin
      return Internal (Get_Object (Colorsel)) /= 0;
   end Get_Has_Opacity_Control;

   -----------------------------
   -- Set_Has_Opacity_Control --
   -----------------------------

   procedure Set_Has_Opacity_Control
     (Colorsel    : access Gtk_Color_Selection_Record;
      Has_Opacity : Boolean)
   is
      procedure Internal
        (Colorsel    : System.Address;
         Has_Opacity : Gboolean);
      pragma Import
        (C, Internal, "gtk_color_selection_set_has_opacity_control");
   begin
      Internal (Get_Object (Colorsel), Boolean'Pos (Has_Opacity));
   end Set_Has_Opacity_Control;

   ---------------------
   -- Get_Has_Palette --
   ---------------------

   function Get_Has_Palette
     (Colorsel : access Gtk_Color_Selection_Record) return Boolean
   is
      function Internal (Colorsel : System.Address) return Gboolean;
      pragma Import (C, Internal, "gtk_color_selection_get_has_palette");
   begin
      return Internal (Get_Object (Colorsel)) /= 0;
   end Get_Has_Palette;

   ---------------------
   -- Set_Has_Palette --
   ---------------------

   procedure Set_Has_Palette
     (Colorsel    : access Gtk_Color_Selection_Record;
      Has_Palette : Boolean)
   is
      procedure Internal
        (Colorsel    : System.Address;
         Has_Palette : Gboolean);
      pragma Import (C, Internal, "gtk_color_selection_set_has_palette");
   begin
      Internal (Get_Object (Colorsel), Boolean'Pos (Has_Palette));
   end Set_Has_Palette;

   -----------------------
   -- Set_Current_Color --
   -----------------------

   procedure Set_Current_Color
     (Colorsel : access Gtk_Color_Selection_Record;
      Color    : Gdk.Color.Gdk_Color)
   is
      procedure Internal
        (Colorsel : System.Address;
         Color    : Gdk.Color.Gdk_Color);
      pragma Import (C, Internal, "gtk_color_selection_set_current_color");
   begin
      Internal (Get_Object (Colorsel), Color);
   end Set_Current_Color;

   -----------------------
   -- Set_Current_Alpha --
   -----------------------

   procedure Set_Current_Alpha
     (Colorsel : access Gtk_Color_Selection_Record;
      Alpha    : Guint16)
   is
      procedure Internal
        (Colorsel : System.Address;
         Alpha    : Guint16);
      pragma Import (C, Internal, "gtk_color_selection_set_current_alpha");
   begin
      Internal (Get_Object (Colorsel), Alpha);
   end Set_Current_Alpha;

   -----------------------
   -- Get_Current_Color --
   -----------------------

   procedure Get_Current_Color
     (Colorsel : access Gtk_Color_Selection_Record;
      Color    : out Gdk.Color.Gdk_Color)
   is
      procedure Internal
        (Colorsel : System.Address;
         Color    : System.Address);
      pragma Import (C, Internal, "gtk_color_selection_get_current_color");
      Col : aliased Gdk.Color.Gdk_Color;
   begin
      Internal (Get_Object (Colorsel), Col'Address);
      Color := Col;
   end Get_Current_Color;

   -----------------------
   -- Get_Current_Alpha --
   -----------------------

   function Get_Current_Alpha
     (Colorsel : access Gtk_Color_Selection_Record) return Guint16
   is
      function Internal (Colorsel : System.Address) return Guint16;
      pragma Import (C, Internal, "gtk_color_selection_get_current_alpha");
   begin
      return Internal (Get_Object (Colorsel));
   end Get_Current_Alpha;

   ------------------------
   -- Set_Previous_Color --
   ------------------------

   procedure Set_Previous_Color
     (Colorsel : access Gtk_Color_Selection_Record;
      Color    : Gdk.Color.Gdk_Color)
   is
      procedure Internal
        (Colorsel : System.Address;
         Color    : Gdk.Color.Gdk_Color);
      pragma Import (C, Internal, "gtk_color_selection_set_previous_color");
   begin
      Internal (Get_Object (Colorsel), Color);
   end Set_Previous_Color;

   ------------------------
   -- Set_Previous_Alpha --
   ------------------------

   procedure Set_Previous_Alpha
     (Colorsel : access Gtk_Color_Selection_Record;
      Alpha    : Guint16)
   is
      procedure Internal
        (Colorsel : System.Address;
         Alpha    : Guint16);
      pragma Import (C, Internal, "gtk_color_selection_set_previous_alpha");
   begin
      Internal (Get_Object (Colorsel), Alpha);
   end Set_Previous_Alpha;

   ------------------------
   -- Get_Previous_Color --
   ------------------------

   procedure Get_Previous_Color
     (Colorsel : access Gtk_Color_Selection_Record;
      Color    : out Gdk.Color.Gdk_Color)
   is
      procedure Internal
        (Colorsel : System.Address;
         Color    : System.Address);
      pragma Import (C, Internal, "gtk_color_selection_get_previous_color");
      Col : aliased Gdk.Color.Gdk_Color;
   begin
      Internal (Get_Object (Colorsel), Col'Address);
      Color := Col;
   end Get_Previous_Color;

   ------------------------
   -- Get_Previous_Alpha --
   ------------------------

   function Get_Previous_Alpha
     (Colorsel : access Gtk_Color_Selection_Record) return Guint16
   is
      function Internal (Colorsel : System.Address) return Guint16;
      pragma Import (C, Internal, "gtk_color_selection_get_previous_alpha");
   begin
      return Internal (Get_Object (Colorsel));
   end Get_Previous_Alpha;

   -----------------
   -- To_Absolute --
   -----------------

   function To_Absolute (Color : Gdouble) return Gushort is
   begin
      return Gushort (Gdouble (Gushort'Last) * Color);
   end To_Absolute;

   ----------------
   -- To_Percent --
   ----------------

   function To_Percent (Color : Gushort) return Gdouble is
   begin
      return Gdouble (Color) / Gdouble (Gushort'Last);
   end To_Percent;

   -------------------------
   -- Palette_From_String --
   -------------------------

   function Palette_From_String (Str : String) return Gdk_Color_Array is
      function Internal
        (Str : String; Colors : access System.Address; N : access Gint)
         return Gboolean;
      pragma Import (C, Internal, "gtk_color_selection_palette_from_string");

      N      : aliased Gint;
      Result : aliased System.Address;
   begin
      if Internal (Str & ASCII.NUL, Result'Access, N'Access) = 0 then
         return (1 .. 0 => Null_Color);
      else
         declare
            Res    : constant Big_Color_Array_Access := Convert (Result);
            Output : Gdk_Color_Array (1 .. Natural (N));
         begin
            for O in Output'Range loop
               Output (O) := Res (O - 1);
            end loop;
            return Output;
         end;
      end if;
   end Palette_From_String;

   -----------------------
   -- Palette_To_String --
   -----------------------

   function Palette_To_String (Colors : Gdk_Color_Array) return String is
      function Internal
        (Colors   : System.Address;
         N_Colors : Gint)
         return Interfaces.C.Strings.chars_ptr;
      pragma Import (C, Internal, "gtk_color_selection_palette_to_string");
      Str : chars_ptr;
   begin
      if Colors'Length = 0 then
         return "";
      else
         Str := Internal (Colors (Colors'First)'Address, Colors'Length);
         declare
            Result : constant String := Value (Str);
         begin
            Free (Str);
            return Result;
         end;
      end if;
   end Palette_To_String;

   ------------------------
   -- Palette_Hook_Proxy --
   ------------------------

   procedure Palette_Hook_Proxy
     (Screen : Gdk_Screen; Colors : System.Address; N_Colors : Gint)
   is
      Res    : constant Big_Color_Array_Access := Convert (Colors);
      Output : Gdk_Color_Array (1 .. Natural (N_Colors));
   begin
      for O in Output'Range loop
         Output (O) := Res (O - 1);
      end loop;
      Global_Palette_With_Screen_Hook (Screen, Output);
   end Palette_Hook_Proxy;

   -----------------------------------------
   -- Set_Change_Palette_With_Screen_Hook --
   -----------------------------------------

   function Set_Change_Palette_With_Screen_Hook
     (Func : Gtk_Color_Selection_Change_Palette_With_Screen_Func)
      return Gtk_Color_Selection_Change_Palette_With_Screen_Func
   is
      function Internal (Func : System.Address) return System.Address;
      pragma Import
        (C, Internal,
         "gtk_color_selection_set_change_palette_with_screen_hook");
      Old : constant Gtk_Color_Selection_Change_Palette_With_Screen_Func :=
        Global_Palette_With_Screen_Hook;
      Tmp : System.Address;
      pragma Unreferenced (Tmp);
   begin
      Global_Palette_With_Screen_Hook := Func;
      if Func = null then
         Tmp := Internal (System.Null_Address);
      else
         Tmp := Internal (Palette_Hook_Proxy'Address);
      end if;
      return Old;
   end Set_Change_Palette_With_Screen_Hook;


end Gtk.Color_Selection;