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<!-- ##### SECTION Title ##### -->
GtkRadioButton
<!-- ##### SECTION Short_Description ##### -->
A choice from multiple check buttons
<!-- ##### SECTION Long_Description ##### -->
<para>
A single radio button performs the same basic function as a #GtkCheckButton,
as its position in the object hierarchy reflects. It is only when multiple
radio buttons are grouped together that they become a different user
interface component in their own right.</para>
<para>
Every radio button is a member of some group of radio buttons. When one is selected, all other
radio buttons in the same group are deselected. A #GtkRadioButton is one way
of giving the user a choice from many options.
</para>
<para>
Radio button widgets are created with gtk_radio_button_new(), passing NULL
as the argument if this is the first radio button in a group. In subsequent
calls, the group you wish to add this button to should be passed as an
argument. Optionally, gtk_radio_button_new_with_label() can be used if you
want a text label on the radio button.
</para>
<para>
Alternatively, when adding widgets to an existing group of radio buttons,
use gtk_radio_button_new_from_widget() with a #GtkRadioButton that already
has a group assigned to it. The convenience function
gtk_radio_button_new_with_label_from_widget() is also provided.
</para>
<para>
To retrieve the group a #GtkRadioButton is assigned to, use
gtk_radio_button_get_group().
</para>
<para>
To remove a #GtkRadioButton from one group and make it part of a new one, use gtk_radio_button_set_group().
</para>
<para>
The group list does not need to be freed, as each #GtkRadioButton will remove
itself and its list item when it is destroyed.
</para>
<para>
<example>
<title>How to create a group of two radio buttons.</title>
<programlisting>
void create_radio_buttons (void) {
GtkWidget *window, *radio1, *radio2, *box, *entry;
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
box = gtk_vbox_new (TRUE, 2);
/* Create a radio button with a GtkEntry widget */
radio1 = gtk_radio_button_new (NULL);
entry = gtk_entry_new (<!-- -->);
gtk_container_add (GTK_CONTAINER (radio1), entry);
/* Create a radio button with a label */
radio2 = gtk_radio_button_new_with_label_from_widget (GTK_RADIO_BUTTON (radio1),
"I'm the second radio button.");
/* Pack them into a box, then show all the widgets */
gtk_box_pack_start (GTK_BOX (box), radio1, TRUE, TRUE, 2);
gtk_box_pack_start (GTK_BOX (box), radio2, TRUE, TRUE, 2);
gtk_container_add (GTK_CONTAINER (window), box);
gtk_widget_show_all (window);
return;
}
</programlisting>
</example>
</para>
<para>
When an unselected button in the group is clicked the clicked button
receives the "toggled" signal, as does the previously selected button.
Inside the "toggled" handler, gtk_toggle_button_get_active() can be used
to determine if the button has been selected or deselected.
</para>
<!-- ##### SECTION See_Also ##### -->
<para>
<variablelist>
<varlistentry>
<term>#GtkOptionMenu</term>
<listitem><para>Another way of offering the user a single choice from
many.</para></listitem>
</varlistentry>
</variablelist>
</para>
<!-- ##### SECTION Stability_Level ##### -->
<!-- ##### SECTION Image ##### -->
<!-- ##### STRUCT GtkRadioButton ##### -->
<para>
Contains only private data that should be read and manipulated using the
functions below.
</para>
<!-- ##### SIGNAL GtkRadioButton::group-changed ##### -->
<para>
</para>
@radiobutton: the object which received the signal.
<!-- ##### ARG GtkRadioButton:group ##### -->
<para>
Sets a new group for a radio button.
</para>
<!-- ##### FUNCTION gtk_radio_button_new ##### -->
<para>
Creates a new #GtkRadioButton. To be of any practical value, a widget should
then be packed into the radio button.
</para>
@group: an existing radio button group, or %NULL if you are creating a new group.
@Returns: a new radio button.
<!-- ##### FUNCTION gtk_radio_button_new_from_widget ##### -->
<para>
Creates a new #GtkRadioButton, adding it to the same group as @radio_group_member.
As with gtk_radio_button_new(), a widget should be packed into the radio button.
</para>
@radio_group_member: an existing #GtkRadioButton.
@Returns: a new radio button.
<!-- ##### FUNCTION gtk_radio_button_new_with_label ##### -->
<para>
Creates a new #GtkRadioButton with a text label.
</para>
@group: an existing radio button group, or %NULL if you are creating a new
group.
@label: the text label to display next to the radio button.
@Returns: a new radio button.
<!-- ##### FUNCTION gtk_radio_button_new_with_label_from_widget ##### -->
<para>
Creates a new #GtkRadioButton with a text label, adding it to the same group
as @radio_group_member.
</para>
@radio_group_member: widget to get radio group from or NULL
@label: a text string to display next to the radio button.
@Returns: a new radio button.
<!-- # Unused Parameters # -->
@group: an existing #GtkRadioButton.
<!-- ##### FUNCTION gtk_radio_button_new_with_mnemonic ##### -->
<para>
</para>
@group:
@label:
@Returns:
<!-- ##### FUNCTION gtk_radio_button_new_with_mnemonic_from_widget ##### -->
<para>
</para>
@radio_group_member:
@label:
@Returns:
<!-- ##### FUNCTION gtk_radio_button_set_group ##### -->
<para>
Sets a #GtkRadioButton's group. It should be noted that this does not change
the layout of your interface in any way, so if you are changing the group,
it is likely you will need to re-arrange the user interface to reflect these
changes.
</para>
@radio_button: a #GtkRadioButton.
@group: an existing radio button group, such as one returned from
gtk_radio_button_get_group().
<!-- ##### FUNCTION gtk_radio_button_get_group ##### -->
@radio_button:
@Returns:
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