Button

5.1.1. Constructors

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);

Wherever possible you should use Stock items, to ensure consistency with other applications, and to improve the appearance of your applications by using icons. For instance, 

Gtk::Button* pButton = new Gtk::Button(Gtk::Stock::OK);
This will use standard text, in all languages, with standard keyboard accelerators, with a standard icon.

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

Reference

5.1.2. Example

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

Figure 5-1 buttons example

Source Code

File: buttons.h (For use with gtkmm 3, not gtkmm 2) 

#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: main.cc (For use with gtkmm 3, not gtkmm 2) 

#include "buttons.h"
#include <gtkmm/application.h>

int main(int argc, char *argv[])
{
  Glib::RefPtr<Gtk::Application> app = Gtk::Application::create(argc, argv, "org.gtkmm.example");

  Buttons buttons;

  //Shows the window and returns when it is closed.
  return app->run(buttons);
}

File: buttons.cc (For use with gtkmm 3, not gtkmm 2) 

#include "buttons.h"
#include <iostream>

Buttons::Buttons()
{
  m_button.add_pixlabel("info.xpm", "cool button");

  set_title("Pixmap'd buttons!");
  set_border_width(10);

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

  add(m_button);

  show_all_children();
}

Buttons::~Buttons()
{
}

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

5.1.3. Signals

The Gtk::Button widget has the following signals, but most of the time you will just handle the clicked signal:

pressed

Emitted when the button is pressed.

released

Emitted when the button is released.

clicked

Emitted when the button is pressed and released.

enter

Emitted when the mouse pointer moves over the button's window.

leave

Emitted when the mouse pointer leaves the button's window.

Button ToggleButton

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