<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="togglebutton.c" xml:lang="de">

  <info>

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

    <link type="guide" xref="c#buttons"/>

    <link type="seealso" xref="grid.c"/>

    <link type="seealso" xref="switch.c"/>

    <revision version="0.1" date="2012-06-12" status="draft"/>

    <credit type="author copyright">

      <name>Monica Kochofar</name>

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

      <years>2012</years>

    </credit>

    <desc>A button which retains state</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</mal:years>

    </mal:credit>

  </info>

  <title>ToggleButton</title>

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

  
When this ToggleButton is in an active state, the spinner spins.

#include <gtk/gtk.h>

/*This is the callback function. It is a handler function 

which reacts to the signal. In this case, it will cause the 

spinner to start and stop according to how many times the user 

presses the button.*/

static void

button_toggled_cb (GtkWidget *button,

                   gpointer   user_data)

{

  GtkWidget *spinner = user_data;

  if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON(button)))

          gtk_spinner_start (GTK_SPINNER (spinner));

  else {

          gtk_spinner_stop (GTK_SPINNER (spinner));

  }

}

static void

activate (GtkApplication *app,

          gpointer        user_data)

{

  GtkWidget *window;

  GtkWidget *button;

  GtkWidget *grid;

  GtkWidget *spinner;

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

  window = gtk_application_window_new (app);

  gtk_window_set_title (GTK_WINDOW (window), "ToggleButton Example");

  gtk_window_set_default_size (GTK_WINDOW (window), 300, 300);

  gtk_container_set_border_width(GTK_CONTAINER(window), 30);

  /*Create a togglebutton with a label*/

  button = gtk_toggle_button_new_with_label ("Start/Stop");

  /*Create a spinner, with extra horizontal and vertical space*/

  spinner = gtk_spinner_new ();

  gtk_widget_set_hexpand (spinner, TRUE);

  gtk_widget_set_vexpand (spinner, TRUE);

  /*Create a grid and set the row spacing, attach the togglebutton 

  and spinner onto the grid and position them accordingly*/

  grid = gtk_grid_new();

  gtk_grid_set_row_homogeneous (GTK_GRID (grid), FALSE);

  gtk_grid_set_row_spacing (GTK_GRID (grid), 15);

  gtk_grid_attach (GTK_GRID (grid), spinner, 0, 0, 1, 1);

  gtk_grid_attach (GTK_GRID (grid), button, 0, 1, 1, 1);

  gtk_container_add (GTK_CONTAINER (window), grid);

  /*Connecting the toggled signal to the callback*/

  g_signal_connect (GTK_TOGGLE_BUTTON (button), "toggled", 

                    G_CALLBACK (button_toggled_cb), spinner);

  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/GtkSpinner.html">GtkSpinner</link>
</item>

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

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

</list>

</page>