1<?xml version="1.0" encoding="utf-8"?> 2<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"> 3 <info> 4 <title type="text">Spinner (JavaScript)</title> 5 <link type="guide" xref="beginner.js#display-widgets"/> 6 <revision version="0.1" date="2012-06-03" status="draft"/> 7 8 <credit type="author copyright"> 9 <name>Taryn Fox</name> 10 <email its:translate="no">jewelfox@fursona.net</email> 11 <years>2012</years> 12 </credit> 13 14 <desc>A spinner animation</desc> 15 16 <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright"> 17 <mal:name>Mario Blättermann</mal:name> 18 <mal:email>mario.blaettermann@gmail.com</mal:email> 19 <mal:years>2011, 2013, 2016, 2018, 2021</mal:years> 20 </mal:credit> 21 </info> 22 23 <title>Spinner</title> 24 <media type="image" mime="image/png" src="media/spinner.png"/> 25 <p>This Spinner is stopped and started by pressing the spacebar.</p> 26 27<code mime="application/javascript" style="numbered">#!/usr/bin/gjs 28 29imports.gi.versions.Gdk = '3.0'; 30imports.gi.versions.Gtk = '3.0'; 31 32const Gio = imports.gi.Gio; 33const GLib = imports.gi.GLib; 34const Gtk = imports.gi.Gtk; 35const Gdk = imports.gi.Gdk; 36 37class SpinnerExample { 38 39 // Create the application itself 40 constructor() { 41 this.application = new Gtk.Application({ 42 application_id: 'org.example.jsspinner', 43 flags: Gio.ApplicationFlags.FLAGS_NONE 44 }); 45 46 // Connect 'activate' and 'startup' signals to the callback functions 47 this.application.connect('activate', this._onActivate.bind(this)); 48 this.application.connect('startup', this._onStartup.bind(this)); 49 } 50 51 // Callback function for 'activate' signal presents windows when active 52 _onActivate() { 53 this._window.present(); 54 } 55 56 // Callback function for 'startup' signal builds the UI 57 _onStartup() { 58 this._buildUI(); 59 } 60 61 // Build the application's UI 62 _buildUI() { 63 64 // Create the application window 65 this._window = new Gtk.ApplicationWindow({ 66 application: this.application, 67 window_position: Gtk.WindowPosition.CENTER, 68 title: "Spinner Example", 69 default_height: 200, 70 default_width: 200, 71 border_width: 30 72 }); 73 74 // Create a spinner which starts spinning automatically 75 this._spinner = new Gtk.Spinner ({active: true}); 76 this._window.add (this._spinner); 77 78 // Connect a keypress event to the function that makes it start or stop spinning 79 this._window.connect("key-press-event", this._onKeyPress.bind(this)); 80 81 // Show the window and all child widgets 82 this._window.show_all(); 83 } 84 85 _onKeyPress(widget, event) { 86 87 // Get the value of the key that was pressed 88 let [, keyval] = event.get_keyval(); 89 90 // If it was the spacebar, toggle the spinner to start or stop 91 if (keyval == Gdk.KEY_space) { 92 if (this._spinner.active == true) 93 this._spinner.stop(); 94 else 95 this._spinner.start(); 96 } 97 } 98}; 99 100// Run the application 101let app = new SpinnerExample (); 102app.application.run (ARGV); 103</code> 104<p>In diesem Beispiel haben wir Folgendes verwendet:</p> 105<list> 106 <item><p><link href="http://www.roojs.org/seed/gir-1.2-gtk-3.0/gjs/Gdk.html">Gdk - Key Values</link></p></item> 107 <item><p><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.Application.html">Gtk.Application</link></p></item> 108 <item><p><link href="http://developer.gnome.org/gtk3/stable/GtkApplicationWindow.html">Gtk.ApplicationWindow</link></p></item> 109 <item><p><link href="http://www.roojs.org/seed/gir-1.2-gtk-3.0/gjs/Gtk.Spinner.html">Gtk.Spinner</link></p></item> 110</list> 111</page> 112