extension.js

'use strict';

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

const ExtensionUtils = imports.misc.extensionUtils;
const Me = ExtensionUtils.getCurrentExtension();
const Main = imports.ui.main;
const PanelMenu = imports.ui.panelMenu;

const Config = imports.misc.config;
const SHELL_MINOR = parseInt(Config.PACKAGE_VERSION.split('.')[1]);

const Util = imports.misc.util;

var ExampleIndicator = class ExampleIndicator extends PanelMenu.Button {

    _init() {
        super._init(0.0, `${Me.metadata.name} Indicator`, false);

        this._icon = new St.Icon({
            style_class: 'system-status-icon'
        });
        this._icon.gicon = Gio.icon_new_for_string(`${Me.path}/icons/moon-dark.png`);
        this.actor.add_child(this._icon);

        this.menu.addAction('Enable Dark Mode', this.enableDarkMode, null);
        this.menu.addAction('Disable Dark Mode', this.disableDarkMode, null);
    }

    enableDarkMode() {
        Util.spawn(['/bin/bash', '-c', "gsettings set org.gnome.desktop.interface gtk-theme 'Adwaita-dark'"]);
    }

    disableDarkMode() {
        Util.spawn(['/bin/bash', '-c', "gsettings set org.gnome.desktop.interface gtk-theme 'Adwaita'"]);
    }

}

// Compatibility with gnome-shell >= 3.32
if (SHELL_MINOR > 30) {
    ExampleIndicator = GObject.registerClass(
        {GTypeName: 'ExampleIndicator'},
        ExampleIndicator
    );
}

// We're going to declare `indicator` in the scope of the whole script so it can
// be accessed in both `enable()` and `disable()`
var indicator = null;


function init() {
    log(`initializing ${Me.metadata.name} version ${Me.metadata.version}`);
}


function enable() {
    log(`enabling ${Me.metadata.name} version ${Me.metadata.version}`);

    indicator = new ExampleIndicator();

    // The `main` import is an example of file that is mostly live instances of
    // objects, rather than reusable code. `Main.panel` is the actual panel you
    // see at the top of the screen.
    Main.panel.addToStatusArea(`${Me.metadata.name} Indicator`, indicator);
}


function disable() {
    log(`disabling ${Me.metadata.name} version ${Me.metadata.version}`);

    // REMINDER: It's required for extensions to clean up after themselves when
    // they are disabled. This is required for approval during review!
    if (indicator !== null) {
        indicator.destroy();
        indicator = null;
    }
}