# first group
$foo1 = Gtk2::RadioButton->new (undef, 'Foo One');
$foo2 = Gtk2::RadioButton->new ($foo1, 'Foo Two');
$foo3 = Gtk2::RadioButton->new ($foo2, 'Foo Three');
# second group, using the group reference
$bar1 = Gtk2::RadioButton->new (undef, 'Bar One');
$group = $bar1->get_group;
$bar2 = Gtk2::RadioButton->new ($group, 'Bar Two');
$bar3 = Gtk2::RadioButton->new ($group, 'Bar Three');
# move bar3 from the bar group to the foo group.
$bar->set_group ($foo->get_group);
# iterate over the widgets in the group
$group = $foo1->get_group;
foreach my $r (@$group) {
$r->set_sensitive ($whatever);
}
A single radio button performs the same basic function as a Gtk2::CheckButton, 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.
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 Gtk2::RadioButton is one way of giving the user a choice from many options; Gtk2::OptionMenu and Gtk2::ComboBox (added in gtk+ 2.4) are alternatives.
Each constructor can take either a group or widget from that group where the group is wanted; this is an enhancement over the C API. Nevertheless, the _from_widget forms are provided for completeness.
