#include <gtk/gtk.h>

static void destroy (GtkWidget*, gpointer);

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

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW (window), "Buttons");
  gtk_container_set_border_width (GTK_CONTAINER (window), 25);
  gtk_widget_set_size_request (window, 200, 100);

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

  /* Create a new button that has a mnemonic key of Alt+C. */
  button = gtk_button_new_with_mnemonic ("_Close");
  gtk_button_set_relief (GTK_BUTTON (button), GTK_RELIEF_NONE);
  
  /* Connect the button to the clicked signal. The callback function recieves the
   * window followed by the button because the arguments are swapped. */
  g_signal_connect_swapped (G_OBJECT (button), "clicked",
                            G_CALLBACK (gtk_widget_destroy),
                            (gpointer) window);

  gtk_container_add (GTK_CONTAINER (window), button);
  gtk_widget_show_all (window);

  gtk_main ();
  return 0;
}

/* Stop the GTK+ main loop function. */
static void
destroy (GtkWidget *window,
         gpointer data)
{
  gtk_main_quit ();
}