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 Gtk.Box; 
use Gtk.Box;
with Gtk.Button; 
use Gtk.Button;
with Gtk.Frame; 
use Gtk.Frame;
with Gtk.Label; 
use Gtk.Label;
with Gtk.Separator; 
use Gtk.Separator;
with Gtk; 
use Gtk;
package body Create_Box 
is
   procedure Add_Buttons (Vbox        : Gtk_Box;
                          Message     : String;
                          Homogeneous : Boolean;
                          Expand      : Boolean := False;
                          Fill        : Boolean := False);
   --  Add the buttons within Vbox
   ----------
   -- Help --
   ----------
   function Help 
return String 
is
   begin
      return "This demo show how you can efficiently 
use the @bGtk_Box@B " &
        "container." &
        ASCII.LF &
        ASCII.LF &
        "The upper half shows the different " &
        "combinations 
of the parameters @bHomogeneous@B, @bExpand@B 
and " &
        "@bFill@B. Note that 
for homogeneous boxes, @bExpand@B 
is irrelevant."
        & ASCII.LF &
        " - @bHomogeneous@B: If True 
all the widgets 
in the box will have the "
        & "same size as the largest child."
        & ASCII.LF &
        " - @bExpand@B: If True, the widget size will be bigger than the "
        & "minimum requested 
if more space 
is available. Its exact size "
        & "depends on the @bFill@B parameter"
        & ASCII.LF &
        " - @bFill@B: If False, the widget will be surrounded by empty space,"
        & " but its real size will be the minimum it requested."
        & ASCII.LF
        & ASCII.LF &
        "The second part 
of the demo shows the difference between "
        & "@bPack_Start@B 
and @bPack_End@B. The two resulting groups are "
        & "separated by a space that expands 
when the box 
is resized. This "
        & "space 
of course exists only 
when the widgets 
do not expand. "
        & "The buttons are inserted 
in the order specified (first button, "
        & " second button, ...)";
   
end Help;
   -----------------
   -- Add_Buttons --
   -----------------
   procedure Add_Buttons (Vbox        : Gtk_Box;
                          Message     : String;
                          Homogeneous : Boolean;
                          Expand      : Boolean := False;
                          Fill        : Boolean := False)
   
is
      Button : Gtk_Button;
      Box    : Gtk_Box;
      Label  : Gtk_Label;
   
begin
      Gtk_New (Label, Message);
      Pack_Start (Vbox, Label, Expand => False, Fill => False);
      Gtk_New_Hbox (Box, Homogeneous => Homogeneous);
      Pack_Start (Vbox, Box, Expand => False, Fill => False);
      Gtk_New (Button, "Small");
      Pack_Start (Box, Button, Expand => Expand, Fill => Fill);
      Gtk_New (Button, "A bit longer");
      Pack_Start (Box, Button, Expand => Expand, Fill => Fill);
      Gtk_New (Button, "The longest button");
      Pack_Start (Box, Button, Expand => Expand, Fill => Fill);
   
end Add_Buttons;
   ---------
   -- Run --
   ---------
   procedure Run (Frame : 
access Gtk.Frame.Gtk_Frame_Record'Class) 
is
      Vbox    : Gtk_Box;
      Box     : Gtk_Box;
      Button  : Gtk_Button;
      Sep     : Gtk_Separator;
   
begin
      Gtk.Frame.Set_Label (Frame, "Boxes");
      Gtk_New_Vbox (Vbox, Homogeneous => False, Spacing => 25);
      Add (Frame, Vbox);
      Gtk_New_Vbox (Box, Homogeneous => True);
      Pack_Start (Vbox, Box, Expand => False, Fill => False);
      Add_Buttons (Box, "Homogeneous => False, Expand => False",
                   Homogeneous => False, Expand => False, Fill => False);
      Add_Buttons (Box, "Homogeneous => False, Expand => True, Fill => False",
                   Homogeneous => False, Expand => True, Fill => False);
      Add_Buttons (Box, "Homogeneous => False, Expand => True, Fill => True",
                   Homogeneous => False, Expand => True, Fill => True);
      Add_Buttons (Box, "Homogeneous => True, Fill => False",
                   Homogeneous => True, Fill => False);
      Add_Buttons (Box, "Homogeneous => True, Fill => True",
                   Homogeneous => True, Fill => True);
      Gtk_New_Hseparator (Sep);
      Pack_Start (Vbox, Sep, Expand => False, Fill => True);
      Gtk_New_Vbox (Box, Homogeneous => False);
      Pack_Start (Vbox, Box, Expand => True, Fill => True, Padding => 10);
      Gtk_New (Button, "Pack_Start, First Button");
      Pack_Start (Box, Button, Expand => False, Fill => False);
      Gtk_New (Button, "Pack_Start, Second Button");
      Pack_Start (Box, Button, Expand => False, Fill => False);
      Gtk_New (Button, "Pack_Start, Third Button");
      Pack_Start (Box, Button, Expand => False, Fill => False);
      Gtk_New (Button, "Pack_End, First Button");
      Pack_End (Box, Button, Expand => False, Fill => False);
      Gtk_New (Button, "Pack_End, Second Button");
      Pack_End (Box, Button, Expand => False, Fill => False);
      Gtk_New (Button, "Pack_End, Third Button");
      Pack_End (Box, Button, Expand => False, Fill => False);
      Show_All (Frame);
   
end Run;
end Create_Box;