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<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" xmlns:xi="http://www.w3.org/2001/XInclude" type="guide" style="task" id="spinner.js" xml:lang="de">
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<info>
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<title type="text">Spinner (JavaScript)</title>
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<link type="guide" xref="beginner.js#display-widgets"/>
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<revision version="0.1" date="2012-06-03" status="draft"/>
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<credit type="author copyright">
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<name>Taryn Fox</name>
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<email its:translate="no">jewelfox@fursona.net</email>
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<years>2012</years>
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</credit>
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<desc>A spinner animation</desc>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>Mario Blättermann</mal:name>
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<mal:email>mario.blaettermann@gmail.com</mal:email>
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<mal:years>2011, 2013</mal:years>
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</mal:credit>
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</info>
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<title>Spinner</title>
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<media type="image" mime="image/png" src="media/spinner.png"/>
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This Spinner is stopped and started by pressing the spacebar.
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#!/usr/bin/gjs
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imports.gi.versions.Gdk = '3.0';
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imports.gi.versions.Gtk = '3.0';
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const Gio = imports.gi.Gio;
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const GLib = imports.gi.GLib;
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const Gtk = imports.gi.Gtk;
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const Gdk = imports.gi.Gdk;
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class SpinnerExample {
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// Create the application itself
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constructor() {
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this.application = new Gtk.Application({
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application_id: 'org.example.jsspinner',
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flags: Gio.ApplicationFlags.FLAGS_NONE
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});
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// Connect 'activate' and 'startup' signals to the callback functions
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this.application.connect('activate', this._onActivate.bind(this));
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this.application.connect('startup', this._onStartup.bind(this));
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}
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// Callback function for 'activate' signal presents windows when active
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_onActivate() {
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this._window.present();
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}
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// Callback function for 'startup' signal builds the UI
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_onStartup() {
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this._buildUI();
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}
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// Build the application's UI
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_buildUI() {
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// Create the application window
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this._window = new Gtk.ApplicationWindow({
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application: this.application,
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window_position: Gtk.WindowPosition.CENTER,
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title: "Spinner Example",
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default_height: 200,
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default_width: 200,
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border_width: 30
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});
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// Create a spinner which starts spinning automatically
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this._spinner = new Gtk.Spinner ({active: true});
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this._window.add (this._spinner);
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// Connect a keypress event to the function that makes it start or stop spinning
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this._window.connect("key-press-event", this._onKeyPress.bind(this));
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// Show the window and all child widgets
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this._window.show_all();
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}
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_onKeyPress(widget, event) {
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// Get the value of the key that was pressed
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let [, keyval] = event.get_keyval();
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// If it was the spacebar, toggle the spinner to start or stop
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if (keyval == Gdk.KEY_space) {
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if (this._spinner.active == true)
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this._spinner.stop();
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else
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this._spinner.start();
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}
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}
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};
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// Run the application
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let app = new SpinnerExample ();
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app.application.run (ARGV);
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In this sample we used the following:
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<list>
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<item><link href="http://www.roojs.org/seed/gir-1.2-gtk-3.0/gjs/Gdk.html">Gdk - Key Values</link> </item>
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<item><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.Application.html">Gtk.Application</link> </item>
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<item><link href="http://developer.gnome.org/gtk3/stable/GtkApplicationWindow.html">Gtk.ApplicationWindow</link> </item>
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<item><link href="http://www.roojs.org/seed/gir-1.2-gtk-3.0/gjs/Gtk.Spinner.html">Gtk.Spinner</link> </item>
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</list>
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</page>
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