# ProgressBar (JavaScript)

Taryn Fox
jewelfox@fursona.net 2012
A bar which animates to indicate progress
Mario Blättermann
mario.blaettermann@gmail.com 2011, 2013, 2016, 2018

# ProgressBar

Pressing any key stops and starts this ProgressBar.

This ProgressBar is stopped and started by pressing any key.

#!/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 ProgressBarExample {

// Create the application itself constructor() { this.application = new Gtk.Application({ application_id: 'org.example.jsprogressbar', 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, default_height: 20, default_width: 220, title: "ProgressBar Example"});

// Create the progress bar this.progressBar = new Gtk.ProgressBar (); this._window.add(this.progressBar);

// Start the function that pulses the bar every 100 milliseconds this.sourceID = GLib.timeout_add(GLib.PRIORITY_DEFAULT, 100, this._barPulse.bind(this));

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

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

// Pulse the progressbar (unless it has been disabled by a keypress) _barPulse() { this.progressBar.pulse(); return true; }

// Start or stop the progressbar when a key is pressed _onKeyPress() { if (this.sourceID == 0) this.sourceID = GLib.timeout_add(GLib.PRIORITY_DEFAULT, 100, this._barPulse.bind(this)); else { GLib.source_remove(this.sourceID); this.sourceID = 0; } }

};

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

In this sample we used the following:

GLib

Gtk.Application

Gtk.ApplicationWindow

Gtk.ProgressBar