Dưới đây là ví dụ về chỉ báo ứng dụng trong C. Đây là phiên bản "chỉ chỉ báo" (không có cửa sổ) của ví dụ được cung cấp tại Ubuntu Wiki :
#include <libappindicator/app-indicator.h>
static void activate_action (GtkAction *action);
static GtkActionEntry entries[] = {
{"New", "document-new", "_New", "<control>N",
"Create a new file", G_CALLBACK(activate_action)},
{"Open", "document-open", "_Open", "<control>O",
"Open a file", G_CALLBACK(activate_action)},
{"Save", "document-save", "_Save", "<control>S",
"Save file", G_CALLBACK(activate_action)},
{"Quit", "application-exit", "_Quit", "<control>Q",
"Exit the application", G_CALLBACK(gtk_main_quit)},
};
static guint n_entries = G_N_ELEMENTS(entries);
static const gchar *ui_info =
"<ui>"
" <popup name='IndicatorPopup'>"
" <menuitem action='New' />"
" <menuitem action='Open' />"
" <menuitem action='Save' />"
" <menuitem action='Quit' />"
" </popup>"
"</ui>";
static void activate_action(GtkAction *action)
{
const gchar *name = gtk_action_get_name (action);
GtkWidget *dialog;
dialog = gtk_message_dialog_new(NULL,
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_INFO,
GTK_BUTTONS_CLOSE,
"You activated action: \"%s\"",
name);
g_signal_connect(dialog, "response",
G_CALLBACK(gtk_widget_destroy), NULL);
gtk_widget_show(dialog);
}
int main(int argc, char **argv)
{
GtkWidget* indicator_menu;
GtkActionGroup* action_group;
GtkUIManager* uim;
AppIndicator* indicator;
GError* error = NULL;
gtk_init(&argc, &argv);
/* Menus */
action_group = gtk_action_group_new("AppActions");
gtk_action_group_add_actions(action_group, entries, n_entries,
NULL);
uim = gtk_ui_manager_new();
gtk_ui_manager_insert_action_group(uim, action_group, 0);
if (!gtk_ui_manager_add_ui_from_string(uim, ui_info, -1, &error)) {
g_message("Failed to build menus: %s\n", error->message);
g_error_free(error);
error = NULL;
}
/* Indicator */
indicator = app_indicator_new("example-simple-client",
"go-jump",
APP_INDICATOR_CATEGORY_APPLICATION_STATUS);
indicator_menu = gtk_ui_manager_get_widget(uim, "/ui/IndicatorPopup");
app_indicator_set_status(indicator, APP_INDICATOR_STATUS_ACTIVE);
app_indicator_set_attention_icon(indicator, "indicator-messages-new");
app_indicator_set_menu(indicator, GTK_MENU(indicator_menu));
gtk_main();
return 0;
}