<?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="combobox.c" lang="de">
  <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>Ein Widget, dass zur Auswahl aus einer Liste von Elementen verwendet wird</desc>
  <credit type="translator copyright"><name>Mario Blättermann</name><email>mario.blaettermann@gmail.com</email><years>2011, 2013, 2016, 2018, 2021</years></credit></info>

  <title>ComboBox</title>
  <media type="image" mime="image/png" src="media/combobox.png"/>
  <p>This ComboBox prints to the terminal when you change your selection.</p>

      <code mime="text/x-csrc" style="numbered">
#include &lt;gtk/gtk.h&gt;

/* 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 &lt; 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;
}
</code>
<p>In diesem Beispiel haben wir Folgendes verwendet:</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/GtkComboBoxText.html">GtkComboBoxText</link></p></item>
</list>
</page>
