Cet article fait parti d’un ensemble d’exemples et d’articles sur gtkmm consultables ici. Cet exemple montre comment créer une boite de dialogue pour l’ouverture d’un fichier:

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Code source

main.cpp

#include 
#include 

int main(int argc, char* argv[])
{
	// Initialize gtkmm
	Gtk::Main app(argc, argv);
	// Create the window
	mainwindow w;
	// Start main loop
	Gtk::Main::run(w);
	return 0;
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include 


// The class mainwindow inherits from Gtk::Window
class mainwindow : public Gtk::Window
{
	// Constructor and destructor
public:    
	mainwindow();
	virtual					~mainwindow();

protected:
	void                    on_button_load();

	//Member widgets:
	Gtk::Button             buttonLoad;
	Gtk::Button             buttonQuit;
	Gtk::Grid               mainGrid;

};


#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include 


// Constructor of the main Window (build ui interface).
mainwindow::mainwindow()
{
    // Initialize the main window and hide the title bar
    this->set_border_width(10);

    // Add the load button
    buttonLoad.add_label("Load file");
    buttonLoad.set_size_request(200,50);
    buttonLoad.signal_pressed().connect(sigc::mem_fun(*this,&mainwindow::on_button_load));
    mainGrid.attach(buttonLoad,0,0,1,1);

    // Add the Quit button
    buttonQuit.add_label("Quit");
    buttonQuit.set_size_request(200,50);
    buttonQuit.signal_pressed().connect(sigc::mem_fun(*this,&mainwindow::close));
    mainGrid.attach(buttonQuit,0,1,1,1);

    // Display the main grid in the main window
    mainGrid.show_all();

    // Insert the grid in the main window
    add(mainGrid);
}


// Destructor of the class
mainwindow::~mainwindow()
{}


void mainwindow::on_button_load()
{
    // Create the dialog box FileChooser
    Gtk::FileChooserDialog dialog("Please choose a file",Gtk::FILE_CHOOSER_ACTION_OPEN);
    dialog.set_transient_for(*this);

    //Add response buttons the the dialog:
    dialog.add_button("_Cancel", Gtk::RESPONSE_CANCEL);
    dialog.add_button("_Open", Gtk::RESPONSE_OK);

    //Add filters, so that only certain file types can be selected:
    Glib::RefPtr filter_text = Gtk::FileFilter::create();
    filter_text->set_name("Text files");
    filter_text->add_mime_type("text/plain");
    dialog.add_filter(filter_text);

    Glib::RefPtr filter_cpp = Gtk::FileFilter::create();
    filter_cpp->set_name("C/C++ files");
    filter_cpp->add_mime_type("text/x-c");
    filter_cpp->add_mime_type("text/x-c++");
    filter_cpp->add_mime_type("text/x-c-header");
    dialog.add_filter(filter_cpp);

    Glib::RefPtr filter_any = Gtk::FileFilter::create();
    filter_any->set_name("Any files");
    filter_any->add_pattern("*");
    dialog.add_filter(filter_any);

    //Show the dialog and wait for a user response:
    int result = dialog.run();

    //Handle the response:
    switch(result)
    {
    case(Gtk::RESPONSE_OK):
    {
        // The user selected a file
        std::cout << "Open clicked." << std::endl;
        std::string filename = dialog.get_filename();
        std::cout << "File selected: " <<  filename << std::endl;
        break;
    }
    case(Gtk::RESPONSE_CANCEL):
    {
        // The user clicked cancel
        std::cout << "Cancel clicked." << std::endl;
        break;
    }
    default:
    {
        // The user closed the dialog box
        std::cout << "Unexpected button clicked." << std::endl;
        break;
    }
    }
}