GTK+ 2.0 Tutorial
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# Code Examples

Below are the code examples that are used in the above text which are not included in complete form elsewhere.

# Tictactoe

## tictactoe.h

    /* GTK - The GIMP Toolkit
     * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
     *
     * This library is free software; you can redistribute it and/or
     * modify it under the terms of the GNU Library 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
     * Library General Public License for more details.
     *
     * You should have received a copy of the GNU Library 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.
     */
    #ifndef __TICTACTOE_H__
    #define __TICTACTOE_H__

    #include <glib.h>
    #include <glib-object.h>
    #include <gtk/gtktable.h>

    G_BEGIN_DECLS

    #define TICTACTOE_TYPE            (tictactoe_get_type ())
    #define TICTACTOE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), TICTACTOE_TYPE, Tictactoe))
    #define TICTACTOE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), TICTACTOE_TYPE, TictactoeClass))
    #define IS_TICTACTOE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), TICTACTOE_TYPE))
    #define IS_TICTACTOE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), TICTACTOE_TYPE))

    typedef struct _Tictactoe       Tictactoe;
    typedef struct _TictactoeClass  TictactoeClass;

    struct _Tictactoe
    {
      GtkTable table;

      GtkWidget *buttons[3][3];
    };

    struct _TictactoeClass
    {
      GtkTableClass parent_class;

      void (* tictactoe) (Tictactoe *ttt);
    };

    GType          tictactoe_get_type        (void);
    GtkWidget*     tictactoe_new             (void);
    void	       tictactoe_clear           (Tictactoe *ttt);

    G_END_DECLS

    #endif /* __TICTACTOE_H__ */

## tictactoe.c

    /* GTK - The GIMP Toolkit
     * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
     *
     * This library is free software; you can redistribute it and/or
     * modify it under the terms of the GNU Library 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
     * Library General Public License for more details.
     *
     * You should have received a copy of the GNU Library 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.
     */
    #include <gtk/gtksignal.h>
    #include <gtk/gtktable.h>
    #include <gtk/gtktogglebutton.h>
    #include "tictactoe.h"

    enum {
      TICTACTOE_SIGNAL,
      LAST_SIGNAL
    };

    static void tictactoe_class_init          (TictactoeClass *klass);
    static void tictactoe_init                (Tictactoe      *ttt);
    static void tictactoe_toggle              (GtkWidget *widget, Tictactoe *ttt);

    static guint tictactoe_signals[LAST_SIGNAL] = { 0 };

    GType
    tictactoe_get_type (void)
    {
      static GType ttt_type = 0;

      if (!ttt_type)
        {
          static const GTypeInfo ttt_info =
          {
    	sizeof (TictactoeClass),
    	NULL, /* base_init */
            NULL, /* base_finalize */
    	(GClassInitFunc) tictactoe_class_init,
            NULL, /* class_finalize */
    	NULL, /* class_data */
            sizeof (Tictactoe),
    	0,
    	(GInstanceInitFunc) tictactoe_init,
          };

          ttt_type = g_type_register_static (GTK_TYPE_TABLE, "Tictactoe", &ttt_info, 0);
        }

      return ttt_type;
    }

    static void
    tictactoe_class_init (TictactoeClass *klass)
    {

      tictactoe_signals[TICTACTOE_SIGNAL] = g_signal_new ("tictactoe",
    					 G_TYPE_FROM_CLASS (klass),
    	                                 G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
    	                                 G_STRUCT_OFFSET (TictactoeClass, tictactoe),
                                             NULL,
                                             NULL,
    					 g_cclosure_marshal_VOID__VOID,
                                             G_TYPE_NONE, 0);

    }

    static void
    tictactoe_init (Tictactoe *ttt)
    {
      gint i,j;

      gtk_table_resize (GTK_TABLE (ttt), 3, 3);
      gtk_table_set_homogeneous (GTK_TABLE (ttt), TRUE);

      for (i=0;i<3; i++)
        for (j=0;j<3; j++)      {
    	ttt->buttons[i][j] = gtk_toggle_button_new ();
    	gtk_table_attach_defaults (GTK_TABLE (ttt), ttt->buttons[i][j],
    				   i, i+1, j, j+1);
    	g_signal_connect (G_OBJECT (ttt->buttons[i][j]), "toggled",
    			  G_CALLBACK (tictactoe_toggle), (gpointer) ttt);
    	gtk_widget_set_size_request (ttt->buttons[i][j], 20, 20);
    	gtk_widget_show (ttt->buttons[i][j]);
          }
    }

    GtkWidget*
    tictactoe_new ()
    {
      return GTK_WIDGET (g_object_new (tictactoe_get_type (), NULL));
    }

    void
    tictactoe_clear (Tictactoe *ttt)
    {
      int i,j;

      for (i = 0; i<3; i++)
        for (j = 0; j<3; j++)
          {
    	g_signal_handlers_block_matched (G_OBJECT (ttt->buttons[i][j]),
                                             G_SIGNAL_MATCH_DATA,
                                             0, 0, NULL, NULL, ttt);
    	gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (ttt->buttons[i][j]),
    				      FALSE);
    	g_signal_handlers_unblock_matched (G_OBJECT (ttt->buttons[i][j]),
                                               G_SIGNAL_MATCH_DATA,
                                               0, 0, NULL, NULL, ttt);
          }
    }

    static void
    tictactoe_toggle (GtkWidget *widget, Tictactoe *ttt)
    {
      int i,k;

      static int rwins[8][3] = { { 0, 0, 0 }, { 1, 1, 1 }, { 2, 2, 2 },
    			     { 0, 1, 2 }, { 0, 1, 2 }, { 0, 1, 2 },
    			     { 0, 1, 2 }, { 0, 1, 2 } };
      static int cwins[8][3] = { { 0, 1, 2 }, { 0, 1, 2 }, { 0, 1, 2 },
    			     { 0, 0, 0 }, { 1, 1, 1 }, { 2, 2, 2 },
    			     { 0, 1, 2 }, { 2, 1, 0 } };

      int success, found;

      for (k = 0; k<8; k++)
        {
          success = TRUE;
          found = FALSE;

          for (i = 0; i<3; i++)
    	{
    	  success = success &&
    	    GTK_TOGGLE_BUTTON (ttt->buttons[rwins[k][i]][cwins[k][i]])->active;
    	  found = found ||
    	    ttt->buttons[rwins[k][i]][cwins[k][i]] == widget;
    	}

          if (success && found)
    	{
    	  g_signal_emit (G_OBJECT (ttt),
    	                 tictactoe_signals[TICTACTOE_SIGNAL], 0);
    	  break;
    	}
        }
    }

## ttt_test.c

    #include <stdlib.h>
    #include <gtk/gtk.h>
    #include "tictactoe.h"

    void win( GtkWidget *widget,
              gpointer   data )
    {
      g_print ("Yay!\n");
      tictactoe_clear (TICTACTOE (widget));
    }

    int main( int   argc,
              char *argv[] )
    {
      GtkWidget *window;
      GtkWidget *ttt;

      gtk_init (&argc, &argv);

      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

      gtk_window_set_title (GTK_WINDOW (window), "Aspect Frame");

      g_signal_connect (G_OBJECT (window), "destroy",
    		    G_CALLBACK (exit), NULL);

      gtk_container_set_border_width (GTK_CONTAINER (window), 10);

      ttt = tictactoe_new ();

      gtk_container_add (GTK_CONTAINER (window), ttt);
      gtk_widget_show (ttt);

      /* And attach to its "tictactoe" signal */
      g_signal_connect (G_OBJECT (ttt), "tictactoe",
    		    G_CALLBACK (win), NULL);

      gtk_widget_show (window);

      gtk_main ();

      return 0;
    }

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