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<tr><th colspan="3" align="center">Radio Button</th></tr>
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<th width="60%" align="center">Chapter 6. Buttons</th>
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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="sec-radio-buttons"></a>Radio Button</h2></div></div></div>
<p>
There is no separate class for radio buttons. Check buttons and toggle buttons
act as radio buttons when they form a group. Only one button in a group can be
selected at any one time.
</p>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="radiobutton-groups"></a>Groups</h3></div></div></div>
<p>
You create the buttons, and set up their group afterwards. In the following example,
we put 3 radio buttons in a group:
</p>
<pre class="programlisting"><code class="code">auto rb1 = Gtk::make_managed<Gtk::CheckButton>("button1");
auto rb2 = Gtk::make_managed<Gtk::CheckButton>("button2");
auto rb3 = Gtk::make_managed<Gtk::CheckButton>("button3");
rb2->set_group(*rb1);
rb3->set_group(*rb1);
</code></pre>
<p>
We told <span class="application">gtkmm</span> to put all three <code class="classname">CheckButton</code>s in the
same group by using <code class="methodname">set_group()</code> to tell the other
<code class="classname">CheckButton</code>s to share group with the first
<code class="classname">CheckButton</code>.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="radiobutton-methods"></a>Methods</h3></div></div></div>
<p>
<code class="classname">CheckButton</code>s and <code class="classname">ToggleButton</code>s are "off"
when created; this means that when you first make a group of them, they will all be off.
Don't forget to turn one of them on using <code class="methodname">set_active()</code>.
</p>
<p><a class="ulink" href="https://gnome.pages.gitlab.gnome.org/gtkmm/classGtk_1_1RadioButton.html" target="_top">Reference</a></p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="radiobutton-example"></a>Example</h3></div></div></div>
<p>
The following example demonstrates the use of grouped
<code class="classname">CheckButton</code>s:
</p>
<div class="figure">
<a name="figure-radiobutton"></a><p class="title"><b>Figure 6.3. RadioButton</b></p>
<div class="figure-contents">
<div class="screenshot">
<div class="mediaobject"><img src="figures/radiobuttons.png" alt="RadioButton"></div>
</div>
</div>
</div>
<br class="figure-break">
<p><a class="ulink" href="https://gitlab.gnome.org/GNOME/gtkmm-documentation/tree/master/examples/book/buttons/radiobutton" target="_top">Source Code</a></p>
<p>File: <code class="filename">radiobuttons.h</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code">#ifndef GTKMM_EXAMPLE_RADIOBUTTONS_H
#define GTKMM_EXAMPLE_RADIOBUTTONS_H
#include <gtkmm/box.h>
#include <gtkmm/window.h>
#include <gtkmm/button.h>
#include <gtkmm/checkbutton.h>
#include <gtkmm/separator.h>
class RadioButtons : public Gtk::Window
{
public:
RadioButtons();
virtual ~RadioButtons();
protected:
//Signal handlers:
void on_button_clicked();
//Child widgets:
Gtk::Box m_Box_Top, m_Box1, m_Box2;
Gtk::CheckButton m_RadioButton1, m_RadioButton2, m_RadioButton3;
Gtk::Separator m_Separator;
Gtk::Button m_Button_Close;
};
#endif //GTKMM_EXAMPLE_RADIOBUTTONS_H
</code></pre>
<p>File: <code class="filename">main.cc</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code">#include "radiobuttons.h"
#include <gtkmm/application.h>
int main(int argc, char *argv[])
{
auto app = Gtk::Application::create("org.gtkmm.example");
//Shows the window and returns when it is closed.
return app->make_window_and_run<RadioButtons>(argc, argv);
}
</code></pre>
<p>File: <code class="filename">radiobuttons.cc</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code">#include "radiobuttons.h"
RadioButtons::RadioButtons() :
m_Box_Top(Gtk::Orientation::VERTICAL),
m_Box1(Gtk::Orientation::VERTICAL, 10),
m_Box2(Gtk::Orientation::VERTICAL, 10),
m_RadioButton1("button1"),
m_RadioButton2("button2"),
m_RadioButton3("button3"),
m_Button_Close("close")
{
// Set title and border of the window
set_title("radio buttons");
// Gtk::CheckButton and Gtk::ToggleButton have set_group() methods.
// They act as radio buttons, if they are included in a group.
// Put radio buttons 2 and 3 in the same group as 1:
m_RadioButton2.set_group(m_RadioButton1);
m_RadioButton3.set_group(m_RadioButton1);
// Add outer box to the window (because the window
// can only contain a single widget)
set_child(m_Box_Top);
//Put the inner boxes and the separator in the outer box:
m_Box_Top.append(m_Box1);
m_Box_Top.append(m_Separator);
m_Box_Top.append(m_Box2);
m_Separator.set_expand();
// Set the inner boxes' margins
m_Box1.set_margin(10);
m_Box2.set_margin(10);
// Put the radio buttons in Box1:
m_Box1.append(m_RadioButton1);
m_Box1.append(m_RadioButton2);
m_Box1.append(m_RadioButton3);
m_RadioButton1.set_expand();
m_RadioButton2.set_expand();
m_RadioButton3.set_expand();
// Set the second button active
m_RadioButton2.set_active(true);
// Put Close button in Box2:
m_Box2.append(m_Button_Close);
m_Button_Close.set_expand();
// Make the button the default widget
set_default_widget(m_Button_Close);
// Connect the toggled signal of the button to
// RadioButtons::on_button_toggled()
m_Button_Close.signal_clicked().connect(sigc::mem_fun(*this,
&RadioButtons::on_button_clicked) );
}
RadioButtons::~RadioButtons()
{
}
void RadioButtons::on_button_clicked()
{
set_visible(false); //to close the application.
}
</code></pre>
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