This is a demo code using Radio Buttons, where you can find how I find which radio button is selected:
#include <gtkmm/window.h>
#include <gtkmm/box.h>
#include <gtkmm/radiobutton.h>
#include <gtkmm/separator.h>
#include <gtkmm/application.h>
#include <iostream>
class ButtonWindow : public Gtk::Window
{
private:
//Child widgets:
Gtk::Box m_Box_Top, m_Box1, m_Box2;
Gtk::RadioButton m_RadioButton1, m_RadioButton2, m_RadioButton3;
Gtk::Separator m_Separator;
Gtk::Button m_Button_Close;
Gtk::RadioButton *m_SelectedButton{nullptr};
public:
ButtonWindow()
: m_Box_Top(Gtk::ORIENTATION_VERTICAL),
m_Box1(Gtk::ORIENTATION_VERTICAL, 15),
m_Box2(Gtk::ORIENTATION_VERTICAL, 0),
m_RadioButton1("button 1"),
m_RadioButton2("button 2"),
m_RadioButton3("button 3"),
m_Button_Close("close")
{
// Set title and border of the window
set_title("radio buttons");
set_border_width(0);
// Put radio buttons 2 and 3 in the same group as 1:
m_RadioButton2.join_group(m_RadioButton1);
m_RadioButton3.join_group(m_RadioButton1);
// Add outer box to the window (because the window
// can only contain a single widget)
add(m_Box_Top);
//Put the inner boxes and the separator in the outer box:
m_Box_Top.pack_start(m_Box1);
m_Box_Top.pack_start(m_Separator);
m_Box_Top.pack_start(m_Box2);
// Set the inner boxes' borders
m_Box1.set_border_width(20);
m_Box2.set_border_width(10);
// Put the radio buttons in Box1:
m_Box1.pack_start(m_RadioButton1);
m_Box1.pack_start(m_RadioButton2);
m_Box1.pack_start(m_RadioButton3);
// Put Close button in Box2:
m_Box2.pack_start(m_Button_Close);
// Connect the button signals:
#if 1 // C++11: (change this to #if 0 to use the traditional way)
m_RadioButton1.signal_clicked().connect([&]{on_radio_button_clicked(m_RadioButton1);});
m_RadioButton2.signal_clicked().connect([&]{on_radio_button_clicked(m_RadioButton2);});
m_RadioButton3.signal_clicked().connect([&]{on_radio_button_clicked(m_RadioButton3);});
m_Button_Close.signal_clicked().connect([&]{on_close_button_clicked();});
#else // Traditional:
m_RadioButton1.signal_clicked() // Full sigc
.connect(sigc::bind(sigc::mem_fun(*this, &ButtonWindow::on_radio_button_clicked),
sigc::ref(m_RadioButton1)));
m_RadioButton2.signal_clicked() // sigc && C++98
.connect(std::bind(sigc::mem_fun(*this, &ButtonWindow::on_radio_button_clicked),
std::ref(m_RadioButton2)));
m_RadioButton3.signal_clicked() // Full C++98
.connect(std::bind(&ButtonWindow::on_radio_button_clicked, this,
std::ref(m_RadioButton3)));
m_Button_Close.signal_clicked()
.connect(sigc::mem_fun(*this, &ButtonWindow::on_close_button_clicked));
#endif
// Set the second button active:
m_RadioButton2.set_active();
// Make the close button the default widget:
m_Button_Close.set_can_default();
m_Button_Close.grab_default();
// Show all children of the window:
show_all_children();
}
protected:
//Signal handlers:
void on_radio_button_clicked(Gtk::RadioButton& button)
{
if(m_SelectedButton != &button && button.get_active())
{
m_SelectedButton = &button;
std::cout << "Radio "<< m_SelectedButton->get_label() << " selected.\n";
}
}
void on_close_button_clicked()
{
hide(); // Close the application
}
};
int main(int argc, char *argv[])
{
auto app = Gtk::Application::create(argc, argv, "org.gtkmm.example");
ButtonWindow button;
//Shows the window and returns when it is closed.
return app->run(button);
}