Chapter 6. Buttons
Prev     Next

Chapter 6. Buttons

Table of Contents

gtkmm provides four basic types of buttons:

Push buttons

Gtk::Button. Standard buttons, usually marked with a label or picture. Pushing one triggers an action. See the Button section.

Toggle buttons

Gtk::ToggleButton. Unlike a normal Button, which springs back up, a ToggleButton stays down until you press it again. It might be useful as an on/off switch. See the ToggleButton section.

Check buttons

Gtk::CheckButton. These act like ToggleButtons, but show their state in small squares, with their label at the side. They should be used in most situations which require an on/off setting. See the CheckButton section.

Radio buttons

Named after the station selectors on old car radios, these buttons are used in groups for options which are mutually exclusive. Pressing one causes all the others in its group to turn off. They are similar to ToggleButtons or CheckButtons (a small widget with a label at the side), but usually look different. There is no separate radio button class. Check buttons and toggle buttons can act as radio buttons. See the Radio Button section.

Note that, due to GTK's theming system, the appearance of these widgets will vary. In the case of check buttons and radio buttons, they may vary considerably.

Button

There are two ways to create a Button. You can specify a label string in the Gtk::Button constructor, or set it later with set_label().

To define an accelerator key for keyboard navigation, place an underscore before one of the label's characters and specify true for the optional mnemonic parameter. For instance: 

Gtk::Button* pButton = new Gtk::Button("_Something", true);

Gtk::Button is also a container so you could put any other widget, such as a Gtk::Image into it.

The Gtk::Button widget has the clicked signal which is emitted when the button is pressed and released.

Reference

Example

This example creates a button with a picture and a label.

Figure 6.1. buttons example

buttons example

Source Code

File: buttons.h (For use with gtkmm 4)

#ifndef GTKMM_EXAMPLE_BUTTONS_H
#define GTKMM_EXAMPLE_BUTTONS_H

#include <gtkmm/window.h>
#include <gtkmm/button.h>

class Buttons : public Gtk::Window
{
public:
  Buttons();
  virtual ~Buttons();

protected:
  //Signal handlers:
  void on_button_clicked();

  //Child widgets:
  Gtk::Button m_button;
};

#endif //GTKMM_EXAMPLE_BUTTONS_H

File: buttons.cc (For use with gtkmm 4)

#include "buttons.h"
#include <gtkmm/box.h>
#include <gtkmm/image.h>
#include <gtkmm/label.h>
#include <iostream>

Buttons::Buttons()
{
  // This corresponds to Gtk::Bin::add_pixlabel("info.xpm", "cool button") in gtkmm3.
  //Create Image and Label widgets:
  auto pmap = Gtk::make_managed<Gtk::Image>("info.xpm");
  auto label = Gtk::make_managed<Gtk::Label>("cool button");
  label->set_expand(true);

  //Put them in a Box:
  auto hbox = Gtk::make_managed<Gtk::Box>(Gtk::Orientation::HORIZONTAL, 5);
  hbox->append(*pmap);
  hbox->append(*label);

  //And put that Box in the button:
  m_button.set_child(*hbox);

  set_title("Pixmap'd buttons!");

  m_button.signal_clicked().connect( sigc::mem_fun(*this,
              &Buttons::on_button_clicked) );

  m_button.set_margin(10);
  set_child(m_button);
}

Buttons::~Buttons()
{
}

void Buttons::on_button_clicked()
{
  std::cout << "The Button was clicked." << std::endl;
}

File: main.cc (For use with gtkmm 4)

#include "buttons.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<Buttons>(argc, argv);
}
Prev     Next
Chapter 5. Changes in gtkmm-4.0 and glibmm-2.68  Home  ToggleButton