struct _SystemLoadPluginClass
{
  XfcePanelIndicatorClass __parent__;
};

struct _SystemLoadPlugin
{
  XfcePanelIndicator __parent__;

  XfcePanelIndicatorItem *cpu_indicator;

  guint                   timeout_id;
};



/* define the plugin */
XFCE_PANEL_DEFINE_PLUGIN (SystemLoadPlugin, systemload_plugin)



static void
systemload_plugin_class_init (LauncherPluginClass *klass)
{
  XfcePanelPluginClass    *plugin_class;
  XfcePanelIndicatorClass *indicator_class;

  plugin_class = XFCE_PANEL_PLUGIN_CLASS (klass);
  plugin_class->construct = systemload_plugin_construct;
  plugin_class->free_data = systemload_plugin_free_data
  plugin_class->about = systemload_plugin_about;
  
  indicator_class = XFCE_PANEL_INDICATOR_CLASS (klass);
  indicator_class->get_properties = systemload_plugin_get_properties;
}



static void
systemload_plugin_init (SystemLoadPlugin *plugin)
{
  GtkWidget *image;

  plugin->cpu_indicator = xfce_panel_indicator_item_new (XFCE_PANEL_INDICATOR (plugin),
                                                         "cpu", /* unique id for config */
                                                         _("CPU"), /* display name for config */,
                                                         XFCE_PANEL_INDICATOR_LABEL
                                                         | XFCE_PANEL_INDICATOR_PROGRESSBAR,
                                                         XFCE_PANEL_INDICATOR_MASK /* all are supported */);
  g_signal_connect (G_OBJECT (plugin->cpu_indicator), "get-menu",
      G_CALLBACK (systemload_plugin_get_cpu_menu), plugin);

  xfce_panel_indicator_item_set_text (plugin->cpu_indicator, "%d%%", 0);

  image = xfce_panel_image_new_from_source ("cpu");
  xfce_panel_indicator_item_set_image (plugin->cpu_indicator, image);
  gtk_widget_show (image);
  
  /* you can set tooltips on the entire box */
  gtk_widget_set_tooltip_text (GTK_WIDGET (plugin->cpu_indicator),
                               _("System Load: 0%"));
}



/* now completely hooked to the panel */
static void
systemload_plugin_construct (XfcePanelPlugin *panel_plugin)
{
  /* hookup the ->about vfunc */
  xfce_panel_plugin_menu_show_about (panel_plugin);

  /* start update timeout */
  plugin->timeout_id = gdk_threads_add_timeout (250, systemload_plugin_update, panel_plugin);
}



static void
systemload_plugin_free_data (XfcePanelPlugin *panel_plugin)
{
  SystemLoadPlugin *plugin = XFCE_SYSTEM_LOAD_PLUGIN (panel_plugin);

  if (plugin->timeout_id != 0)
    g_source_remove (plugin->timeout_id);
}



static void
systemload_plugin_about (XfcePanelPlugin *panel_plugin)
{
  gtk_show_about_dialog (NULL,
                         "comments", _("System Load plugin"),
                         "copyright", "Copyright \302\251 Someone",
                         "license", XFCE_LICENSE_GPL,
                         "program-name", PACKAGE_NAME,
                         "translator-credits", _("translator-credits"),
                         "version", PACKAGE_VERSION,
                         "website", "http://www.xfce.org/",
                         "logo-icon-name", PACKAGE_NAME,
                         NULL);
}



static GtkWidget *
systemload_plugin_get_properties (XfcePanelIndicator *indicator)
{
  GtkWidget *vbox;
  GtkWidget *frame;

  vbox = gtk_vbox_new (FALSE, 6);
  frame = xfce_gtk_frame_box_new_with_content (_("Properties"), vbox);
  gtk_widget_show (vbox);

  /* pack custom stuff in vbox here */

  return frame;
}



static GtkMenu *
systemload_plugin_get_cpu_menu (XfcePanelIndicatorItem *cpu_indicator,
                                SystemLoadPlugin       *plugin)
{
  GtkWidget *menu, *mi;

  menu = gtk_menu_new ();

  /* plugin submenu or appended between sparators,
   * XfcePanelIndicatorItem can decide on that */
  mi = gtk_image_menu_item_new_from_stock (GTK_STOCK_CLEAR, NULL);
  gtk_menu_shell_append (GTK_MENU_SHELL (menu), mi);
  gtk_widget_show (mi);

  return GTK_MENU (menu);
}



static gboolean
systemload_plugin_update (gpointer data)
{
  SystemLoadPlugin *plugin = XFCE_SYSTEM_LOAD_PLUGIN (data);
  GtkWidget        *label;
  gint              value;

  value = g_random_int_range (0, 100);

  xfce_panel_indicator_item_set_text (plugin->cpu_indicator, "%d%%", value);

  xfce_panel_indicator_item_set_value (plugin->cpu_indicator, value / 100.0);

  return TRUE;
}