extension.js

const St = imports.gi.St;
const GObject = imports.gi.GObject;
const Gio = imports.gi.Gio;
const GLib = imports.gi.GLib;

const PanelMenu = imports.ui.panelMenu;
const PopupMenu = imports.ui.popupMenu;
const Main = imports.ui.main;

const Config = imports.misc.config;
const [major] = Config.PACKAGE_VERSION.split(".");
const shellVersion = Number.parseInt(major);

const ExtensionUtils = imports.misc.extensionUtils;
const Me = ExtensionUtils.getCurrentExtension();
const optionsUtils = Me.imports.optionsUtils;
const Common = Me.imports.common;

// Each of GNOME 42 and GNOME 43 use a different system menu,
// that's why there are two classes for system menu.
// GNOME 42 uses AggregateMenu (SystemMenu),
// and GNOME 43 uses QuickSettings (QSystemMenu).
let {SystemMenu} = shellVersion < 43 ? Me.imports.aggregateMenu : Me.imports.quickSettingsMenu;

function init() {
    // Initialise gettext
    ExtensionUtils.initTranslations(Me.metadata.uuid);
}

let extensionIcon = null;
let extensionMenu = null;
let settings = null;
let trayListener = null;

function enable() {
  extensionIcon = Common.getIcon();

  settings = ExtensionUtils.getSettings();

  updateLocation(settings);

  trayListener = settings.connect("changed::tray-location", () => {
    updateLocation(settings);
  })
}

function disable() {
  if (trayListener != null) {
    settings.disconnect(trayListener);
    trayListener = null;
  }

  if (extensionMenu != null) {
    extensionMenu.destroy();
    extensionMenu = null;
  }

  extensionIcon = null;
  settings = null;

  optionsUtils.destroy();
}

function updateLocation(settings) {
  if(extensionMenu != null){
    extensionMenu.destroy();
    extensionMenu = null;
  }

  if (settings.get_boolean("tray-location")) { // Tray mode
    extensionMenu = new TrayMenu();
    Main.panel.addToStatusArea("ideapad-controls", extensionMenu, 1);
  } else { // System menu mode
    extensionMenu = new SystemMenu();
  }
}

const TrayMenu = GObject.registerClass(
  class TrayMenu extends PanelMenu.Button {
    _init() {
      super._init(0);

      // Tray icon
      const icon = new St.Icon({
        gicon: extensionIcon,
        style_class: "system-status-icon",
      });

      this.add_child(icon);

      Common.addOptionsToMenu(this.menu);
    }
  }
);