Description
This widget is generally put on the sides of a drawing area to help the
user measure distances. It indicates the current position of the mouse
cursor within the drawing area, and can be graduated in multiple units.
   
  
  
   Types
   
     - 
         type Gtk_Hruler is Gtk_Ruler; 
- 
         type Gtk_Hruler_Record is Gtk_Ruler_Record; 
- 
         type Gtk_Ruler is access all Gtk_Ruler_Record'Class; 
- 
         
         
- 
         type Gtk_Vruler is Gtk_Ruler; 
- 
         type Gtk_Vruler_Record is Gtk_Ruler_Record; 
  
   
   
  
   Subprograms
   
     - 
procedure Gtk_New_Hruler (Ruler : out Gtk_Ruler); procedure Initialize_Hruler (Ruler : access Gtk_Ruler_Record'Class); 
- 
procedure Gtk_New_Vruler (Ruler : out Gtk_Ruler); procedure Initialize_Vruler (Ruler : access Gtk_Ruler_Record'Class); 
- 
- 
procedure Set_Metric
  (Ruler  : access Gtk_Ruler_Record;
   Metric : Gtk_Metric_Type); function Get_Metric
  (Ruler  : access Gtk_Ruler_Record) return Gtk_Metric_Type; 
- 
procedure Set_Range
  (Ruler    : access Gtk_Ruler_Record;
   Lower    : Gdouble;
   Upper    : Gdouble;
   Position : Gdouble;
   Max_Size : Gdouble); procedure Get_Range
  (Ruler    : access Gtk_Ruler_Record;
   Lower    : out Gdouble;
   Upper    : out Gdouble;
   Position : out Gdouble;
   Max_Size : out Gdouble); 
- 
procedure Draw_Ticks (Ruler : access Gtk_Ruler_Record); procedure Draw_Pos (Ruler : access Gtk_Ruler_Record); 
  
     
  
   
   Testgtk source code
This code is part of testgtk, a demo application packaged with GtkAda. Testgtk demonstrates the various widgets of GtkAda
-----------------------------------------------------------------------
--          GtkAda - Ada95 binding for the Gimp Toolkit              --
--                                                                   --
--                     Copyright (C) 1998-1999                       --
--        Emmanuel Briot, Joel Brobecker and Arnaud Charlet          --
--                                                                   --
-- 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.                                       --
--                                                                   --
-- As a special exception, if other files instantiate generics from  --
-- this unit, or you link this unit with other files to produce an   --
-- executable, this  unit  does not  by itself cause  the resulting  --
-- executable to be covered by the GNU General Public License. This  --
-- exception does not however invalidate any other reasons why the   --
-- executable file  might be covered by the  GNU Public License.     --
-----------------------------------------------------------------------
with Glib;             
use Glib;
with Gdk.Event;        
use Gdk.Event;
with Gtk.Drawing_Area; 
use Gtk.Drawing_Area;
with Gtk.Enums;        
use Gtk.Enums;
with Gtk.Object;       
use Gtk.Object;
with Gtk.Ruler;        
use Gtk.Ruler;
with Gtk.Handlers;     
use Gtk.Handlers;
with Gtk.Table;        
use Gtk.Table;
with Gtk.Widget;       
use Gtk.Widget;
with Gtk;              
use Gtk;
package body Create_Rulers 
is
   package Motion_Cb 
is new Handlers.Return_Callback
     (Gtk_Widget_Record, Gint);
   ----------
   -- Help --
   ----------
   function Help 
return String 
is
   begin
      return "The @bGtk_Ruler@B widget 
is used to display the cursor"
        & " coordinates 
in an image. Note that to 
use it, you need to modify"
        & " the event mask 
of the widget to allow 
for @bPointer_Motion_Mask@B"
        & " events.";
   
end Help;
   ---------
   -- Run --
   ---------
   procedure Run (Frame : 
access Gtk.Frame.Gtk_Frame_Record'Class) 
is
      Ruler : Gtk_Ruler;
      Table : Gtk_Table;
      Darea : Gtk_Drawing_Area;
   
begin
      Set_Label (Frame, "Ruler");
      Gtk_New (Table, 2, 2, False);
      Add (Frame, Table);
      Gtk_New (Darea);
      Unrealize (Darea);
      Set_Events (Darea, Pointer_Motion_Mask + Pointer_Motion_Hint_Mask);
      Attach
        (Table, Darea, 1, 2, 1, 2,
         Expand + Enums.Fill, Expand + Enums.Fill, 0, 0);
      Gtk_New_Hruler (Ruler);
      Set_Range (Ruler, 5.0, 15.0, 0.0, 20.0);
      Motion_Cb.Object_Connect
        (Gtk_Object (Darea), "motion_notify_event",
         Motion_Cb.To_Marshaller (Default_Motion_Notify_Event'Access),
         Slot_Object => Ruler);
      Attach
        (Table, Ruler, 1, 2, 0, 1, Expand + Enums.Fill, Enums.Fill, 0, 0);
      Gtk_New_Vruler (Ruler);
      Set_Range (Ruler, 5.0, 15.0, 0.0, 20.0);
      Motion_Cb.Object_Connect
        (Gtk_Object (Darea), "motion_notify_event",
         Motion_Cb.To_Marshaller (Default_Motion_Notify_Event'Access),
         Slot_Object => Ruler);
      Attach
        (Table, Ruler, 0, 1, 1, 2, Enums.Fill, Expand + Enums.Fill, 0, 0);
      Show_All (Frame);
   
end Run;
end Create_Rulers;