FontDialog and FontChooserDialog
| Chapter 17. Dialogs |

## FontDialog and FontChooserDialog

The `FontChooserDialog` (deprecated since gtkmm 4.10) and `FontDialog` (available since gtkmm 4.10) allow the user to choose a font. The `FontButton` (deprecated since gtkmm 4.10) and `FontDialogButton` (available since gtkmm 4.10) open a font chooser dialog when it is clicked.

FontDialog Reference

FontChooserDialog Reference

### Example

Figure 17.4. FontDialog

Source Code

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();
      ~ExampleWindow() override;

    protected:
      //Signal handlers:
      void on_font_button_font_set();
      void on_button_dialog_clicked();
      void on_dialog_finish(const Glib::RefPtr<Gio::AsyncResult>& result);

      //Child widgets:
      Gtk::Box m_ButtonBox;
      Gtk::FontDialogButton m_FontDialogButton;
      Gtk::Button m_Button_Dialog;

      Glib::RefPtr<Gtk::FontDialog> m_pDialog;
    };

    #endif //GTKMM_EXAMPLEWINDOW_H

File: `examplewindow.cc` (For use with gtkmm 4)

    #include "examplewindow.h"
    #include <iostream>

    ExampleWindow::ExampleWindow()
    : m_ButtonBox(Gtk::Orientation::VERTICAL),
      m_Button_Dialog("Choose Font")
    {
      set_title("Gtk::FontDialog example");

      set_child(m_ButtonBox);

      m_pDialog = Gtk::FontDialog::create();

      m_ButtonBox.append(m_FontDialogButton);
      m_FontDialogButton.set_dialog(m_pDialog);
      m_FontDialogButton.set_font_desc(Pango::FontDescription("Sans 10"));
      m_FontDialogButton.set_expand(true);
      m_FontDialogButton.set_use_font(true);
      m_FontDialogButton.set_use_size(true);
      m_FontDialogButton.property_font_desc().signal_changed().connect(
        sigc::mem_fun(*this, &ExampleWindow::on_font_button_font_set));

      m_ButtonBox.append(m_Button_Dialog);
      m_Button_Dialog.set_expand(true);
      m_Button_Dialog.signal_clicked().connect(
        sigc::mem_fun(*this, &ExampleWindow::on_button_dialog_clicked));
    }

    ExampleWindow::~ExampleWindow()
    {
    }

    void ExampleWindow::on_font_button_font_set()
    {
      auto font_name = m_FontDialogButton.get_font_desc().to_string();
      std::cout << "Font chosen: " << font_name << std::endl;
    }

    void ExampleWindow::on_button_dialog_clicked()
    {
      // Get the previously selected font description from the FontDialogButton.
      m_pDialog->choose_font(*this,
        sigc::mem_fun(*this, &ExampleWindow::on_dialog_finish),
        m_FontDialogButton.get_font_desc());
    }

    void ExampleWindow::on_dialog_finish(const Glib::RefPtr<Gio::AsyncResult>& result)
    {
      try
      {
        // If this call changes the font, it will trigger a call to
        // on_font_button_font_set().
        m_FontDialogButton.set_font_desc(m_pDialog->choose_font_finish(result));
      }
      catch (const Gtk::DialogError& err)
      {
        // Can be thrown by m_pDialog->choose_font_finish(result).
        std::cout << "No font selected. " << err.what() << std::endl;
      }
      catch (const Glib::Error& err)
      {
        std::cout << "Unexpected exception. " << err.what() << std::endl;
      }
    }

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");

      //Shows the window and returns when it is closed.
      return app->make_window_and_run<ExampleWindow>(argc, argv);
    }

ColorDialog and ColorChooserDialog |  | Non-modal AboutDialog