#!/usr/bin/gjs

imports.gi.versions.Gtk = '3.0';

const GLib = imports.gi.GLib;

const Gtk = imports.gi.Gtk;

const Webkit = imports.gi.WebKit;

class HelloGNOME {

    // Create the application itself

    constructor() {

        this.application = new Gtk.Application ();

        // Connect 'activate' and 'startup' signals to the callback functions

        this.application.connect('activate', this._onActivate.bind(this));

        this.application.connect('startup', this._onStartup.bind(this));

    }

    // Callback function for 'activate' signal presents windows when active

    _onActivate() {

        this._window.present();

    }

    // Callback function for 'startup' signal builds the UI

    _onStartup() {

        this._buildUI();

    }

    // Build the application's UI

    _buildUI() {

        // Create the application window

        this._window = new Gtk.ApplicationWindow  ({

            application: this.application,

            title: "Welcome to GNOME",

            default_height: 200,

            default_width: 400,

            window_position: Gtk.WindowPosition.CENTER });

        // Create a webview to show the web app

        this._webView = new Webkit.WebView ();

        // Put the web app into the webview

        this._webView.load_uri (GLib.filename_to_uri (GLib.get_current_dir() +

            "/hellognome.html", null));

        // Put the webview into the window

        this._window.add (this._webView);

        // Show the window and all child widgets

        this._window.show_all();

    }

};

// Run the application

let app = new HelloGNOME ();

app.application.run (ARGV);