# Spinner (JavaScript)

Taryn Fox
jewelfox@fursona.net 2012
A spinner animation
Mario Blättermann
mario.blaettermann@gmail.com 2011, 2013, 2016, 2018

# Spinner

This Spinner is stopped and started by pressing the spacebar.

#!/usr/bin/gjs

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

const Gio = imports.gi.Gio; const GLib = imports.gi.GLib; const Gtk = imports.gi.Gtk; const Gdk = imports.gi.Gdk;

class SpinnerExample {

// Create the application itself constructor() { this.application = new Gtk.Application({ application_id: 'org.example.jsspinner', 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 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: "Spinner Example", default_height: 200, default_width: 200, border_width: 30 });

// Create a spinner which starts spinning automatically this._spinner = new Gtk.Spinner ({active: true}); this._window.add (this._spinner);

// Connect a keypress event to the function that makes it start or stop spinning this._window.connect("key-press-event", this._onKeyPress.bind(this));

// Show the window and all child widgets this._window.show_all(); }

_onKeyPress(widget, event) {

// Get the value of the key that was pressed let [, keyval] = event.get_keyval();

// If it was the spacebar, toggle the spinner to start or stop if (keyval == Gdk.KEY_space) { if (this._spinner.active == true) this._spinner.stop(); else this._spinner.start(); } } };

// Run the application let app = new SpinnerExample (); app.application.run (ARGV);

In this sample we used the following:

Gdk - Key Values

Gtk.Application

Gtk.ApplicationWindow

Gtk.Spinner