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#!/usr/bin/gjs
const Gio = imports.gi.Gio;
const GLib = imports.gi.GLib;
const Gtk = imports.gi.Gtk;
const Gdk = imports.gi.Gdk;
const Lang = imports.lang;
const SpinnerExample = new Lang.Class ({
Name: 'Spinner Example',
// Create the application itself
_init: function () {
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', Lang.bind(this, this._onActivate));
this.application.connect('startup', Lang.bind(this, this._onStartup));
},
// Callback function for 'activate' signal presents windows when active
_onActivate: function () {
this._window.present ();
},
// Callback function for 'startup' signal builds the UI
_onStartup: function () {
this._buildUI ();
},
// Build the application's UI
_buildUI: function () {
// 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", Lang.bind(this, this._onKeyPress));
// Show the window and all child widgets
this._window.show_all();
},
_onKeyPress: function(widget, event) {
// Get the value of the key that was pressed
let keyval = event.get_keyval()[1];
// 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);
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