<?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="progressbar.vala" xml:lang="de">
  <info>
  <title type="text">ProgressBar (Vala)</title>
    <link type="guide" xref="beginner.vala#display-widgets"/>
    <revision version="0.1" date="2012-05-08" status="draft"/>

    <credit type="author copyright">
      <name>Tiffany Antopolski</name>
      <email its:translate="no">tiffany.antopolski@gmail.com</email>
      <years>2012</years>
    </credit>

    <desc>A widget which indicates progress visually</desc>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Mario Blättermann</mal:name>
      <mal:email>mario.blaettermann@gmail.com</mal:email>
      <mal:years>2011, 2013, 2016, 2018</mal:years>
    </mal:credit>
  </info>

  <title>ProgressBar</title>
  <media type="video" mime="application/ogv" src="media/progressbar_fill.ogv"/>
  <p>This ProgressBar "fills in" by a fraction of the bar until it is full.</p>

<code mime="text/x-csharp" style="numbered">public class MyApplication : Gtk.Application {

	Gtk.ProgressBar progress_bar;

	protected override void activate () {
		var window = new Gtk.ApplicationWindow (this);
		window.set_title ("ProgressBar Example");
		window.set_default_size (220, 20);

		progress_bar = new Gtk.ProgressBar ();
		window.add (progress_bar);
		window.show_all ();

		double fraction = 0.0;
		progress_bar.set_fraction (fraction);
		GLib.Timeout.add (500, fill);
	}

	bool fill () {
		double fraction = progress_bar.get_fraction (); //get current progress
		fraction += 0.1; //increase by 10% each time this function is called

		progress_bar.set_fraction (fraction);

		/* This function is only called by GLib.Timeout.add while it returns true; */
		if (fraction &lt; 1.0)
			return true;
		return false;
	}
}

public int main (string[] args) {
	var progress_bar_application = new MyApplication ();
	int status =  progress_bar_application.run (args);
	return status;
}
</code>
<p>
  In this sample we used the following:
</p>
<list>
  <item><p><link href="http://www.valadoc.org/gtk+-3.0/Gtk.ProgressBar.html">Gtk.ProgressBar</link></p></item>
  <item><p><link href="http://www.valadoc.org/glib-2.0/GLib.Timeout.html">GLib.Timeout</link></p></item>
</list>
</page>
