<?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.c" xml:lang="gl">
  <info>
    <title type="text">ProgressBar (C)</title>
    <link type="guide" xref="c#display-widgets"/>
    <link type="seealso" xref="spinner.c"/>
    <revision version="0.1" date="2012-06-16" status="draft"/>

    <credit type="author copyright">
      <name>Monica Kochofar</name>
      <email its:translate="no">monicakochofar@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>Fran Dieguez</mal:name>
      <mal:email>frandieguez@gnome.org</mal:email>
      <mal:years>2012-2013.</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-csrc" style="numbered">
#include &lt;gtk/gtk.h&gt;


static gboolean
fill (gpointer   user_data)
{
  GtkWidget *progress_bar = user_data;

  /*Get the current progress*/
  gdouble fraction;
  fraction = gtk_progress_bar_get_fraction (GTK_PROGRESS_BAR (progress_bar));

  /*Increase the bar by 10% each time this function is called*/
  fraction += 0.1;

  /*Fill in the bar with the new fraction*/
  gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (progress_bar), fraction);

  /*Ensures that the fraction stays below 1.0*/
  if (fraction &lt; 1.0) 
    return TRUE;
  
  return FALSE;
}



static void
activate (GtkApplication *app,
          gpointer        user_data)
{
  GtkWidget *window;
  GtkWidget *progress_bar;

  gdouble fraction = 0.0;

  /*Create a window with a title, and a default size*/
  window = gtk_application_window_new (app);
  gtk_window_set_title (GTK_WINDOW (window), "ProgressBar Example");
  gtk_window_set_default_size (GTK_WINDOW (window), 220, 20);
 
  /*Create a progressbar and add it to the window*/
  progress_bar = gtk_progress_bar_new ();
  gtk_container_add (GTK_CONTAINER (window), progress_bar);

  /*Fill in the given fraction of the bar. Has to be between 0.0-1.0 inclusive*/
  gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (progress_bar), fraction);

  /*Use the created fill function every 500 milliseconds*/
  g_timeout_add (500, fill, GTK_PROGRESS_BAR (progress_bar));
 
  gtk_widget_show_all (window);
}
 


int
main (int argc, char **argv)
{
  GtkApplication *app;
  int status;
 
  app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE);
  g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
  status = g_application_run (G_APPLICATION (app), argc, argv);
  g_object_unref (app);
 
  return status;
}
</code>
<p>Neste exemplo empregaremos o seguinte:</p>
<list>
  <item><p><link href="http://developer.gnome.org/gtk3/3.4/GtkApplication.html">GtkApplication</link></p></item>
  <item><p><link href="http://developer.gnome.org/gtk3/3.4/GtkWindow.html">GtkWindow</link></p></item>
  <item><p><link href="http://developer.gnome.org/gtk3/stable/GtkProgressBar.html">GtkProgressBar</link></p></item>
  <item><p><link href="http://developer.gnome.org/glib/stable/glib-The-Main-Event-Loop.html#g-timeout-add">G_Timeout</link></p></item>
</list>
</page>
