#include <gtk/gtk.h>/* Obligatory basic callback */static void print_hello( GtkWidget *w,                         gpointer   data ){  g_message ("Hello, World!\n");}/* For the check button */static void print_toggle( gpointer   callback_data,                          guint      callback_action,                          GtkWidget *menu_item ){   g_message ("Check button state - %d\n",              GTK_CHECK_MENU_ITEM (menu_item)->active);}/* For the radio buttons */static void print_selected( gpointer   callback_data,                            guint      callback_action,                            GtkWidget *menu_item ){   if(GTK_CHECK_MENU_ITEM(menu_item)->active)     g_message ("Radio button %d selected\n", callback_action);}/* Our menu, an array of GtkItemFactoryEntry structures that defines each menu item */static GtkItemFactoryEntry menu_items[] = {  { "/_File",         NULL,         NULL,           0, "<Branch>" },  { "/File/_New",     "<control>N", print_hello,    0, "<StockItem>", GTK_STOCK_NEW },  { "/File/_Open",    "<control>O", print_hello,    0, "<StockItem>", GTK_STOCK_OPEN },  { "/File/_Save",    "<control>S", print_hello,    0, "<StockItem>", GTK_STOCK_SAVE },  { "/File/Save _As", NULL,         NULL,           0, "<Item>" },  { "/File/sep1",     NULL,         NULL,           0, "<Separator>" },  { "/File/_Quit",    "<CTRL>Q", gtk_main_quit, 0, "<StockItem>", GTK_STOCK_QUIT },  { "/_Options",      NULL,         NULL,           0, "<Branch>" },  { "/Options/tear",  NULL,         NULL,           0, "<Tearoff>" },  { "/Options/Check", NULL,         print_toggle,   1, "<CheckItem>" },  { "/Options/sep",   NULL,         NULL,           0, "<Separator>" },  { "/Options/Rad1",  NULL,         print_selected, 1, "<RadioItem>" },  { "/Options/Rad2",  NULL,         print_selected, 2, "/Options/Rad1" },  { "/Options/Rad3",  NULL,         print_selected, 3, "/Options/Rad1" },  { "/_Help",         NULL,         NULL,           0, "<LastBranch>" },  { "/_Help/About",   NULL,         NULL,           0, "<Item>" },};static gint nmenu_items = sizeof (menu_items) / sizeof (menu_items[0]);/* Returns a menubar widget made from the above menu */static GtkWidget *get_menubar_menu( GtkWidget  *window ){  GtkItemFactory *item_factory;  GtkAccelGroup *accel_group;  /* Make an accelerator group (shortcut keys) */  accel_group = gtk_accel_group_new ();  /* Make an ItemFactory (that makes a menubar) */  item_factory = gtk_item_factory_new (GTK_TYPE_MENU_BAR, "<main>",                                       accel_group);  /* This function generates the menu items. Pass the item factory,     the number of items in the array, the array itself, and any     callback data for the the menu items. */  gtk_item_factory_create_items (item_factory, nmenu_items, menu_items, NULL);  /* Attach the new accelerator group to the window. */  gtk_window_add_accel_group (GTK_WINDOW (window), accel_group);  /* Finally, return the actual menu bar created by the item factory. */  return gtk_item_factory_get_widget (item_factory, "<main>");}/* Popup the menu when the popup button is pressed */static gboolean popup_cb( GtkWidget *widget,                          GdkEvent *event,                          GtkWidget *menu ){   GdkEventButton *bevent = (GdkEventButton *)event;     /* Only take button presses */   if (event->type != GDK_BUTTON_PRESS)     return FALSE;     /* Show the menu */   gtk_menu_popup (GTK_MENU(menu), NULL, NULL,                   NULL, NULL, bevent->button, bevent->time);     return TRUE;}/* Same as with get_menubar_menu() but just return a button with a signal to   call a popup menu */GtkWidget *get_popup_menu( void ){   GtkItemFactory *item_factory;   GtkWidget *button, *menu;     /* Same as before but don't bother with the accelerators */   item_factory = gtk_item_factory_new (GTK_TYPE_MENU, "<main>",                                        NULL);   gtk_item_factory_create_items (item_factory, nmenu_items, menu_items, NULL);   menu = gtk_item_factory_get_widget (item_factory, "<main>");     /* Make a button to activate the popup menu */   button = gtk_button_new_with_label ("Popup");   /* Make the menu popup when clicked */   g_signal_connect (G_OBJECT(button),                     "event",                     G_CALLBACK(popup_cb),                     (gpointer) menu);   return button;}/* Same again but return an option menu */GtkWidget *get_option_menu( void ){   GtkItemFactory *item_factory;   GtkWidget *option_menu;     /* Same again, not bothering with the accelerators */   item_factory = gtk_item_factory_new (GTK_TYPE_OPTION_MENU, "<main>",                                        NULL);   gtk_item_factory_create_items (item_factory, nmenu_items, menu_items, NULL);   option_menu = gtk_item_factory_get_widget (item_factory, "<main>");   return option_menu;}/* You have to start somewhere */int main( int argc,          char *argv[] ){  GtkWidget *window;  GtkWidget *main_vbox;  GtkWidget *menubar, *option_menu, *popup_button;   /* Initialize GTK */  gtk_init (&argc, &argv);   /* Make a window */  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);  g_signal_connect (G_OBJECT (window), "destroy",                    G_CALLBACK (gtk_main_quit),                    NULL);  gtk_window_set_title (GTK_WINDOW(window), "Item Factory");  gtk_widget_set_size_request (GTK_WIDGET(window), 300, 200);   /* Make a vbox to put the three menus in */  main_vbox = gtk_vbox_new (FALSE, 1);  gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 1);  gtk_container_add (GTK_CONTAINER (window), main_vbox);   /* Get the three types of menu */  /* Note: all three menus are separately created, so they are not the     same menu */  menubar = get_menubar_menu (window);  popup_button = get_popup_menu ();  option_menu = get_option_menu ();    /* Pack it all together */  gtk_box_pack_start (GTK_BOX (main_vbox), menubar, FALSE, TRUE, 0);  gtk_box_pack_end (GTK_BOX (main_vbox), popup_button, FALSE, TRUE, 0);  gtk_box_pack_end (GTK_BOX (main_vbox), option_menu, FALSE, TRUE, 0);  /* Show the widgets */  gtk_widget_show_all (window);    /* Finished! */  gtk_main ();   return 0;}