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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="image.js" xml:lang="ca">
<info>
<title type="text">Image (JavaScript)</title>
<link type="guide" xref="beginner.js#display-widgets"/>
<revision version="0.1" date="2012-05-24" status="draft"/>
<credit type="author copyright">
<name>Taryn Fox</name>
<email its:translate="no">jewelfox@fursona.net</email>
<years>2012</years>
</credit>
<desc>A widget displaying an image</desc>
</info>
<title>Image</title>
<media type="image" mime="image/png" src="media/image.png"/>
<p>This GtkApplication displays an image file from the current directory.</p>
<note><p>
If the image file isn't loaded successfully, the image will contain a "broken image" icon. The <file>filename.png</file> needs to be in the current directory for this code to work. Use your favorite picture!
</p></note>
<code mime="application/javascript" style="numbered">#!/usr/bin/gjs
const Gio = imports.gi.Gio;
const GLib = imports.gi.GLib;
const Gtk = imports.gi.Gtk;
const Lang = imports.lang;
const ImageExample = new Lang.Class ({
Name: 'Image Example',
/* Create the application itself
This boilerplate code is needed to build any GTK+ application. */
_init: function () {
this.application = new Gtk.Application ({
application_id: 'org.example.jsimage',
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 initializes menus and 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: "Welcome to GNOME",
default_height: 300,
default_width: 300 });
// Create the label
this.jsimage = new Gtk.Image ({file: "gnome-image.png"});
this._window.add (this.jsimage);
// Show the window and all child widgets
this._window.show_all();
}
});
// Run the application
let app = new ImageExample ();
app.application.run (ARGV);
</code>
<p>
In this sample we used the following:
</p>
<list>
<item><p><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.Application.html">Gtk.Application</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/stable/GtkApplicationWindow.html">Gtk.ApplicationWindow</link></p></item>
<item><p><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.Image.html">Gtk.Image</link></p></item>
</list>
</page>
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