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. 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; }