Table of Contents
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Dialogs are used as secondary windows, to provide specific information or to ask questions. Gtk::Dialog windows contain a few pre-packed widgets to ensure consistency, and a run() method which blocks until the user dismisses the dialog. There are several derived dialog classes which you might find useful. For instance, you will probably use Gtk::MessageDialog for most simple notifications. But at other times you might need to derive your own dialog class to provide more complex functionality. To pack widgets into a custom dialog, you should pack them into the Gtk::VBox, available via get_vbox(). To just add a button to the bottom of the dialog, you could use the add_button() method. The run() method returns an int. This may be a value from the Gtk::ResponseType if the user closed the button by clicking a standard button, or it could be the custom response value that you specified when using add_button(). This is a convenience class, used to create simple, standard message dialogs, with a message, an icon, and buttons for user response. You can specify the type of message and the text in the constructor, as well as specifying standard buttons via ORed Gtk::ButtonsType values. File: examplewindow.h
#ifndef GTKMM_EXAMPLEWINDOW_H
#define GTKMM_EXAMPLEWINDOW_H
#include <gtkmm.h>
class ExampleWindow : public Gtk::Window
{
public:
ExampleWindow();
virtual ~ExampleWindow();
protected:
//Signal handlers:
virtual void on_button_info_clicked();
virtual void on_button_question_clicked();
//Child widgets:
Gtk::VButtonBox m_ButtonBox;
Gtk::Button m_Button_Info, m_Button_Question;
};
#endif //GTKMM_EXAMPLEWINDOW_H
File: examplewindow.cc
#include "examplewindow.h"
#include <gtkmm/dialog.h>
#include <iostream>
ExampleWindow::ExampleWindow()
: m_Button_Info("Show Info MessageDialog"),
m_Button_Question("Show Question MessageDialog")
{
set_title("Gtk::MessageDialog example");
add(m_ButtonBox);
m_ButtonBox.pack_start(m_Button_Info);
m_Button_Info.signal_clicked().connect( SigC::slot(*this, &ExampleWindow::on_button_info_clicked) );
m_ButtonBox.pack_start(m_Button_Question);
m_Button_Question.signal_clicked().connect( SigC::slot(*this, &ExampleWindow::on_button_question_clicked) );
show_all_children();
}
ExampleWindow::~ExampleWindow()
{
}
void ExampleWindow::on_button_info_clicked()
{
Gtk::MessageDialog dialog(*this, "This is an INFO MessageDialog");
dialog.run();
}
void ExampleWindow::on_button_question_clicked()
{
Gtk::MessageDialog dialog(*this, "This is a QUESTION MessageDialog", Gtk::MESSAGE_QUESTION, (Gtk::ButtonsType)(Gtk::BUTTONS_OK | Gtk::BUTTONS_CANCEL));
int result = dialog.run();
//Handle the response:
switch(result)
{
case(Gtk::RESPONSE_OK):
{
std::cout << "OK clicked." << std::endl;
break;
}
case(Gtk::RESPONSE_CANCEL):
{
std::cout << "Cancel clicked." << std::endl;
break;
}
default:
{
std::cout << "Unexpected button clicked." << std::endl;
break;
}
}
}
File: main.cc
#include <gtkmm/main.h>
#include <examplewindow.h>
int main(int argc, char *argv[])
{
Gtk::Main kit(argc, argv);
ExampleWindow window;
Gtk::Main::run(window); //Shows the window and returns when it is closed.
return 0;
}
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