-----------------------------------------------------------------------
--          GtkAda - Ada95 binding for the Gimp Toolkit              --
--                                                                   --
--                  Copyright (C) 2011, 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 Glib.Main;       use Glib.Main;
with Glib.Properties; use Glib.Properties;

with Gtk.Enums;       use Gtk.Enums;
with Gtk.Label;       use Gtk.Label;
with Gtk.Spinner;     use Gtk.Spinner;
with Gtk.Table;       use Gtk.Table;

package body Create_Spinners is

   --  Timer for pulsing activity of one of our spinners.
   package Time_Cb is new Glib.Main.Generic_Sources (Gtk_Spinner);

   --  Function passed to Time_Cb.Timeout_Add, to be invoked periodically.
   function Spinner_Timeout (Spinner : Gtk_Spinner) return Boolean;

   ----------
   -- Help --
   ----------

   function Help return String is
   begin
      return "A %bGtk_Spinner%B widget displays an icon-size spinning"
        & " animation. It is often used as an alternative to a"
        & " %bGtk_Progress%B for displaying indefinite activity, instead"
        & " of actual progress.  To start the animation, use"
        & " %bGtk.Spinner.Start%B; to stop it use $bGtk.Spinner.Stop$B.";
   end Help;

   ---------
   -- Run --
   ---------

   procedure Run (Frame : access Gtk.Frame.Gtk_Frame_Record'Class) is
      Active_Spinner, Transition_Spinner, Inactive_Spinner : Gtk_Spinner;
      Active_Label,   Transition_Label,   Inactive_Label   : Gtk_Label;
      Table1 : Gtk_Table;
      Timer  : G_Source_Id;

   begin
      Set_Label (Frame, "Spinners");

      Gtk_New (Table1, Rows => 3, Columns => 2, Homogeneous => False);
      Add (Frame, Table1);

      Gtk_New (Active_Label, "Active spinner:");
      Gtk_New (Active_Spinner);
      Attach
        (Table1, Active_Label, 0, 1, 0, 1,
         Xpadding => 10, Ypadding => 10);
      Attach
        (Table1, Active_Spinner, 1, 2, 0, 1,
         Xpadding => 25, Ypadding => 25);

      Gtk_New (Transition_Label, "On/Off spinner:");
      Gtk_New (Transition_Spinner);
      Attach
        (Table1, Transition_Label, 0, 1, 1, 2,
         Xpadding => 10, Ypadding => 10);
      Attach
        (Table1, Transition_Spinner, 1, 2, 1, 2,
         Xpadding => 25, Ypadding => 25);

      Gtk_New (Inactive_Label, "Inactive spinner:");
      Gtk_New (Inactive_Spinner);
      Attach
        (Table1, Inactive_Label, 0, 1, 2, 3,
         Xpadding => 10, Ypadding => 10);
      Attach
        (Table1, Inactive_Spinner, 1, 2, 2, 3,
         Xpadding => 25, Ypadding => 25);

      --  Start one spinner, set another pulsing, and don't touch the
      --  third (so that it stays off).
      Gtk.Spinner.Start (Active_Spinner);

      Timer := Time_Cb.Timeout_Add
        (1_000, Spinner_Timeout'Access, Transition_Spinner);

      Show_All (Frame);
   end Run;

   ---------------------
   -- Spinner_Timeout --
   ---------------------

   function Spinner_Timeout (Spinner : Gtk_Spinner) return Boolean is
   begin
      case Get_Property (Spinner, Active_Property) is
         when True  => Stop  (Spinner);
         when False => Start (Spinner);
      end case;

      return True;
   end Spinner_Timeout;

end Create_Spinners;