Radio Buttons#

Radio buttons are buttons that display a “selected” indicator next to their label, and belong to a group of similar buttons. Only one radio button in the group can be selected.

GTK uses check buttons in a group to enable the “radio” behavior.

GtkWidget *live = gtk_check_button_new_with_label ("Live");
GtkWidget *laugh = gtk_check_button_new_with_label ("Laugh");
GtkWidget *love = gtk_check_button_new_with_label ("Love");

gtk_check_button_set_group (GTK_CHECK_BUTTON (laugh),
                            GTK_CHECK_BUTTON (live));
gtk_check_button_set_group (GTK_CHECK_BUTTON (love),
                            GTK_CHECK_BUTTON (live));

Detecting the button that was activated#

You can use the “toggled” signal, or you can use the “active” property.

static void
on_toggled (GtkCheckButton *button,
            const char *identifier)
  gboolean is_active = gtk_check_button_get_active (button);

  if (strcmp (identifier, "live") == 0)
    update_live (is_active);   // update_live() is defined elsewhere
  else if (strcmp (identifier, "laugh") == 0)
    update_laugh (is_active);  // update_laugh() is defined elsewhere
  else if (strcmp (identifier, "love") == 0)
    update_love (is_active);   // update_love() is defined elsewhere

// ...

  // The live, laugh, and love variables are defined like the example above
  g_signal_connect (live, "toggled", G_CALLBACK (on_toggled), "live");
  g_signal_connect (laugh, "toggled", G_CALLBACLK (on_toggled), "laugh");
  g_signal_connect (love, "love", G_CALLBACK (on_toggled), "love");

Useful methods for the component#

  • If you want to enable a mnemonic shortcut for your radio button, you can use the new_with_mnemonic() constructor, or the set_use_underline() method.

API references#

In the examples we used the following classes: