<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="combobox.c" xml:lang="pt-BR">

  <info>

    <title type="text">ComboBox (C)</title>

    <link type="guide" xref="c#menu-combo-toolbar"/>

    <revision version="0.1" date="2012-08-20" status="draft"/>

    <credit type="author copyright">

      <name>Monica Kochofar</name>

      <email its:translate="no">monicakochofar@gmail.com</email>

      <years>2012</years>

    </credit>

    <credit type="editor">

      <name>Tiffany Antopolski</name>

      <email its:translate="no">tiffany.antopolski@gmail.com</email>

    </credit>

    <desc>A widget used to choose from a list of items</desc>

    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">

      <mal:name>Rafael Ferreira</mal:name>

      <mal:email>rafael.f.f1@gmail.com</mal:email>

      <mal:years>2013</mal:years>

    </mal:credit>

  </info>

  <title>ComboBox</title>

  <media type="image" mime="image/png" src="media/combobox.png"/>

  
This ComboBox prints to the terminal when you change your selection.

#include <gtk/gtk.h>

/* This is the callback function. It is a handler function which reacts to the

 * signal. In this case, if the row selected is not the first one of the

 * ComboBox, we write its value in the terminal for the user.

 */

static void

on_changed (GtkComboBox *widget,

            gpointer   user_data)

{

  GtkComboBox *combo_box = widget;

  if (gtk_combo_box_get_active (combo_box) != 0) {

    gchar *distro = gtk_combo_box_text_get_active_text (GTK_COMBO_BOX_TEXT(combo_box));

    g_print ("You chose %s\n", distro);

    g_free (distro);

  }

}

static void

activate (GtkApplication *app,

          gpointer        user_data)

{

  gint i;

  GtkWidget *view;

  GtkWidget *window;

  GtkWidget *combo_box;

  /* Create a window with a title, border width, and a default size. Setting the

   * size to -1 means to use the "natural" default size.

   * (the size request of the window)

   */

  window = gtk_application_window_new (app);

  gtk_window_set_title (GTK_WINDOW (window), "Welcome to GNOME");

  gtk_window_set_default_size (GTK_WINDOW (window), 200, -1);

  gtk_container_set_border_width (GTK_CONTAINER (window), 10);

  /* Create the combo box and append your string values to it. */

  combo_box = gtk_combo_box_text_new ();

  const char *distros[] = {"Select distribution", "Fedora", "Mint", "Suse"};

  /* G_N_ELEMENTS is a macro which determines the number of elements in an array.*/ 

  for (i = 0; i < G_N_ELEMENTS (distros); i++){

  	gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), distros[i]);

  }

  /* Choose to set the first row as the active one by default, from the beginning */

  gtk_combo_box_set_active (GTK_COMBO_BOX (combo_box), 0);

  /* Connect the signal emitted when a row is selected to the appropriate

   * callback function.

   */

  g_signal_connect (combo_box,

                    "changed",

                    G_CALLBACK (on_changed),

                    NULL);

  /* Add it to the window */

  gtk_container_add (GTK_CONTAINER (window), combo_box);

  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;

}

  In this sample we used the following:

<list>

  <item>
<link href="http://developer.gnome.org/gtk3/3.4/GtkApplication.html">GtkApplication</link>
</item>

  <item>
<link href="http://developer.gnome.org/gtk3/3.4/GtkWindow.html">GtkWindow</link>
</item>

  <item>
<link href="http://developer.gnome.org/gtk3/stable/GtkComboBoxText.html">GtkComboBoxText</link>
</item>

</list>

</page>