#include <gtk/gtk.h>

static void destroy (GtkWidget*, gpointer);
static void font_changed (GtkFontButton*, GtkWidget*);

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

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW (window), "Font Button");
  gtk_container_set_border_width (GTK_CONTAINER (window), 10);

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

  label = gtk_label_new ("Look at the font!");
  initial_font = pango_font_description_from_string ("Sans Bold 12");
  gtk_widget_modify_font (label, initial_font);

  /* Create a new font selection button with the given default font. */
  button = gtk_font_button_new_with_font ("Sans Bold 12");
  gtk_font_button_set_title (GTK_FONT_BUTTON (button), "Choose a Font");

  /* Monitor for changes to the font chosen in the font button. */
  g_signal_connect (G_OBJECT (button), "font_set",
                    G_CALLBACK (font_changed),
                    (gpointer) label);

  vbox= gtk_vbox_new (FALSE, 5);
  gtk_box_pack_start_defaults (GTK_BOX (vbox), button);
  gtk_box_pack_start_defaults (GTK_BOX (vbox), label);

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

  gtk_main ();
  return 0;
}

/* When the font is changed, display the font both as the text of a label and as
 * the label's physical font. */
static void 
font_changed (GtkFontButton *button, 
              GtkWidget *label)
{
  const gchar *font, buffer[512];
  PangoFontDescription *desc;
  
  font = gtk_font_button_get_font_name (button);
  desc = pango_font_description_from_string (font);
  
  g_snprintf ((gchar*) buffer, sizeof (buffer), "Font: %s", font);
  gtk_label_set_text (GTK_LABEL (label), buffer);
  gtk_widget_modify_font (label, desc);
}

static void
destroy (GtkWidget *window,
         gpointer data)
{
  gtk_main_quit ();
}