<?xml version="1.0" encoding="utf-8"?>
<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="scrolledwindow.js" xml:lang="ca">
<info>
<title type="text">ScrolledWindow (JavaScript)</title>
<link type="guide" xref="beginner.js#scrolling"/>
<revision version="0.1" date="2012-05-26" status="draft"/>
<credit type="author copyright">
<name>Meg Ford</name>
<email its:translate="no">megford@gnome.org</email>
<years>2013</years>
</credit>
<desc>Adds scrollbars to its child widget</desc>
</info>
<title>ScrolledWindow</title>
<media type="image" mime="image/png" src="media/scrolledwindow.png"/>
<p>An image in a scrolled window.</p>
<links type="section"/>
<section id="code">
<title>Code used to generate this example</title>
<code mime="application/javascript" style="numbered">#!/usr/bin/gjs
imports.gi.versions.Gtk = '3.0';
const GObject = imports.gi.GObject;
const Gtk = imports.gi.Gtk;
class ScrolledWindowExample {
// Create the application itself
constructor() {
this.application = new Gtk.Application({
application_id: 'org.example.jscrolledwindow'
});
// 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,
title: "ScrolledWindow Example",
default_width: 200,
default_height: 200,
border_width: 10
});
// the scrolledwindow
this.scrolledWindow = new Gtk.ScrolledWindow();
this.scrolledWindow.set_border_width(10);
// there is always the scrollbar (otherwise: AUTOMATIC - only if needed - or NEVER)
this.scrolledWindow.set_policy(Gtk.PolicyType.ALWAYS, Gtk.PolicyType.ALWAYS);
// an image - slightly larger than the window
this.image = new Gtk.Image();
this.image.set_from_file("gnome-image.png");
// add the image to the scrolledwindow
this.scrolledWindow.add_with_viewport(this.image);
// add the scrolledwindow to the window
this.window.add(this.scrolledWindow);
this.window.show_all();
}
};
// Run the application
let app = new ScrolledWindowExample();
app.application.run (ARGV);
</code>
</section>
<section id="references">
<title>API References</title>
<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.ScrolledWindow.html">GtkScrolledWindow</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/gtk3-Standard-Enumerations.html">Standard Enumerations</link></p></item>
<item><p><link href="http://www.roojs.com/seed/gir-1.2-gtk-3.0/gjs/Gtk.Image.html">GtkImage</link></p></item>
</list>
</section>
</page>