6.3. Context Menus on Right Click

  void
  view_popup_menu_onDoSomething (GtkWidget *menuitem, gpointer userdata)
  {
    /* we passed the view as userdata when we connected the signal */
    GtkTreeView *treeview = GTK_TREE_VIEW(userdata);

    g_print ("Do something!\n");
  }


  void
  view_popup_menu (GtkWidget *treeview, GdkEventButton *event, gpointer userdata)
  {
    GtkWidget *menu, *menuitem;

    menu = gtk_menu_new();

    menuitem = gtk_menu_item_new_with_label("Do something");

    g_signal_connect(menuitem, "activate",
                     (GCallback) view_popup_menu_onDoSomething, treeview);

    gtk_menu_shell_append(GTK_MENU_SHELL(menu), menuitem);

    gtk_widget_show_all(menu);

    /* Note: event can be NULL here when called from view_onPopupMenu;
     *  gdk_event_get_time() accepts a NULL argument */
    gtk_menu_popup(GTK_MENU(menu), NULL, NULL, NULL, NULL,
                   (event != NULL) ? event->button : 0,
                   gdk_event_get_time((GdkEvent*)event));
  }


  gboolean
  view_onButtonPressed (GtkWidget *treeview, GdkEventButton *event, gpointer userdata)
  {
    /* single click with the right mouse button? */
    if (event->type == GDK_BUTTON_PRESS  &&  event->button == 3)
    {
      g_print ("Single right click on the tree view.\n");

      /* optional: select row if no row is selected or only
       *  one other row is selected (will only do something
       *  if you set a tree selection mode as described later
       *  in the tutorial) */
      if (1)
      {
        GtkTreeSelection *selection;

        selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(treeview));

        /* Note: gtk_tree_selection_count_selected_rows() does not
         *   exist in gtk+-2.0, only in gtk+ >= v2.2 ! */
        if (gtk_tree_selection_count_selected_rows(selection)  <= 1)
        {
           GtkTreePath *path;

           /* Get tree path for row that was clicked */
           if (gtk_tree_view_get_path_at_pos(GTK_TREE_VIEW(treeview),
                                             (gint) event->x, 
                                             (gint) event->y,
                                             &path, NULL, NULL, NULL))
           {
             gtk_tree_selection_unselect_all(selection);
             gtk_tree_selection_select_path(selection, path);
             gtk_tree_path_free(path);
           }
        }
      } /* end of optional bit */

      view_popup_menu(treeview, event, userdata);

      return TRUE; /* we handled this */
    }

    return FALSE; /* we did not handle this */
  }


  gboolean
  view_onPopupMenu (GtkWidget *treeview, gpointer userdata)
  {
    view_popup_menu(treeview, NULL, userdata);

    return TRUE; /* we handled this */
  }


  void
  create_view (void)
  {
    GtkWidget *view;

    view = gtk_tree_view_new();

    ...

    g_signal_connect(view, "button-press-event", (GCallback) view_onButtonPressed, NULL);
    g_signal_connect(view, "popup-menu", (GCallback) view_onPopupMenu, NULL);

    ...
  }