#!/usr/bin/gjs

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

const Gio = imports.gi.Gio;

const GLib = imports.gi.GLib;

const Gtk = imports.gi.Gtk;

class ImageExample {

    /* Create the application itself

       This boilerplate code is needed to build any GTK+ application. */

    constructor() {

        this.application = new Gtk.Application ({

            application_id: 'org.example.jsimage',

            flags: Gio.ApplicationFlags.FLAGS_NONE

        });

        // 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 initializes menus and builds the UI

    _onStartup() {

        this._buildUI();

    }

    // Build the application's UI

    _buildUI() {

        // Create the application window

        this._window = new Gtk.ApplicationWindow({

            application: this.application,

            window_position: Gtk.WindowPosition.CENTER,

            title: "Welcome to GNOME",

            default_height: 300,

            default_width: 300

        });

        // Create the label

        this.jsimage = new Gtk.Image ({file: "gnome-image.png"});

        this._window.add (this.jsimage);

        // Show the window and all child widgets

        this._window.show_all();

    }

};

// Run the application

let app = new ImageExample ();

app.application.run (ARGV);