Table of Contents
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. Gtk::MessageDialog is used 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::Box, available via
get_content_area(). 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 dialog by clicking a standard button, or it could be the custom
response value that you specified when using add_button().
MessageDialog 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 the
Gtk::ButtonsType enum.
File: examplewindow.h (For use with gtkmm 4)
#ifndef GTKMM_EXAMPLEWINDOW_H
#define GTKMM_EXAMPLEWINDOW_H
#include <gtkmm.h>
class ExampleWindow : public Gtk::Window
{
public:
ExampleWindow();
virtual ~ExampleWindow();
protected:
//Signal handlers:
void on_button_info_clicked();
void on_button_question_clicked();
//Child widgets:
Gtk::Box m_ButtonBox;
Gtk::Button m_Button_Info, m_Button_Question;
};
#endif //GTKMM_EXAMPLEWINDOW_H
File: main.cc (For use with gtkmm 4)
#include "examplewindow.h"
#include <gtkmm/application.h>
int main(int argc, char *argv[])
{
auto app = Gtk::Application::create("org.gtkmm.example");
ExampleWindow window;
//Shows the window and returns when it is closed.
return app->run(window, argc, argv);
}
File: examplewindow.cc (For use with gtkmm 4)
#include "examplewindow.h"
#include <gtkmm/messagedialog.h>
#include <iostream>
ExampleWindow::ExampleWindow()
: m_ButtonBox(Gtk::Orientation::VERTICAL),
m_Button_Info("Show Info MessageDialog"),
m_Button_Question("Show Question MessageDialog")
{
set_title("Gtk::MessageDialog example");
add(m_ButtonBox);
m_ButtonBox.add(m_Button_Info);
m_Button_Info.set_expand(true);
m_Button_Info.signal_clicked().connect(sigc::mem_fun(*this,
&ExampleWindow::on_button_info_clicked) );
m_ButtonBox.add(m_Button_Question);
m_Button_Question.set_expand(true);
m_Button_Question.signal_clicked().connect(sigc::mem_fun(*this,
&ExampleWindow::on_button_question_clicked) );
}
ExampleWindow::~ExampleWindow()
{
}
void ExampleWindow::on_button_info_clicked()
{
Gtk::MessageDialog dialog(*this, "This is an INFO MessageDialog");
dialog.set_secondary_text(
"And this is the secondary text that explains things.");
dialog.run();
}
void ExampleWindow::on_button_question_clicked()
{
Gtk::MessageDialog dialog(*this, "This is a QUESTION MessageDialog",
false /* use_markup */, Gtk::MessageType::QUESTION,
Gtk::ButtonsType::OK_CANCEL);
dialog.set_secondary_text(
"And this is the secondary text that explains things.");
int result = dialog.run();
//Handle the response:
switch(result)
{
case Gtk::ResponseType::OK:
{
std::cout << "OK clicked." << std::endl;
break;
}
case Gtk::ResponseType::CANCEL:
{
std::cout << "Cancel clicked." << std::endl;
break;
}
default:
{
std::cout << "Unexpected button clicked." << std::endl;
break;
}
}
}