FileSelection
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## FileSelection

This dialog allows the user to choose a file or folder. For instance, it is used when saving or loading documents.

Reference

### Example

Figure 13.2. FileSelection

Source Code

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_file_clicked();
      virtual void on_button_folder_clicked();

      //Child widgets:
      Gtk::VButtonBox m_ButtonBox;
      Gtk::Button m_Button_File, m_Button_Folder;
    };

    #endif //GTKMM_EXAMPLEWINDOW_H

File: examplewindow.cc

    #include "examplewindow.h"
    #include <gtkmm/dialog.h>
    #include <iostream>

    ExampleWindow::ExampleWindow()
    : m_Button_File("Choose File"),
      m_Button_Folder("Choose Folder")
    {
      set_title("Gtk::FileSelection example");

      add(m_ButtonBox);

      m_ButtonBox.pack_start(m_Button_File);
      m_Button_File.signal_clicked().connect( SigC::slot(*this, &ExampleWindow::on_button_file_clicked) );

      m_ButtonBox.pack_start(m_Button_Folder);
      m_Button_Folder.signal_clicked().connect( SigC::slot(*this, &ExampleWindow::on_button_folder_clicked) );

      show_all_children();
    }

    ExampleWindow::~ExampleWindow()
    {
    }

    void ExampleWindow::on_button_folder_clicked()
    {
      Gtk::FileSelection dialog("Please choose a folder");
      dialog.set_transient_for(*this);
      dialog.get_file_list()->get_parent()->hide(); //Prevent the user from selecting a file.

      int result = dialog.run();

      //Handle the response:
      switch(result)
      {
        case(Gtk::RESPONSE_OK):
        {
          std::cout << "OK clicked." << std::endl;
          std::cout << "Folder selected: " << dialog.get_filename() << std::endl;
          break;
        }
        case(Gtk::RESPONSE_CANCEL):
        {
          std::cout << "Cancel clicked." << std::endl;
          break;
        }
        default:
        {
          std::cout << "Unexpected button clicked." << std::endl;
          break;
        }
      }
    }

    void ExampleWindow::on_button_file_clicked()
    {
      Gtk::FileSelection dialog("Please choose a file");
      dialog.set_transient_for(*this);

      int result = dialog.run();

      //Handle the response:
      switch(result)
      {
        case(Gtk::RESPONSE_OK):
        {
          std::cout << "OK clicked." << std::endl;

          std::string filename = dialog.get_filename(); //Notice that it is a std::string, not a Glib::ustring.
          std::cout << "File selected: " <<  filename << 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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