Setting the font for Gtk::Button

["John Emmas" <johne53 tiscali co uk>]

Using gtkmm, I've written a small test app whose GUI contains three widgets.



The first is a Gtk::Button, the second is a Gtk::FontButton and the third

is a Gtk::ProgressBar. The font button itself has the style 'set_use_font()'

(i.e. it always displays its button text in whatever font I select).  But I

want the other two widgets to use the selected font also - so I wrote this

little function to capture the "font_set" signal and update the other

widgets, like so:-

 

void MainWindow::on_font_changed ()

{

PangoFontDescription* pfd;

Pango::FontDescription* new_font;

 

    // When the font button is used to select a new font, update the

    // other widgets (the font button updates itself automatically).

    Glib::ustring fname = m_pFontButton->get_font_name();

 

    if (pfd = pango_font_description_from_string (fname.c_str()))

    {

        if (new_font = new Pango::FontDescription (pfd, true))

        {

            m_pProgress->modify_font (*new_font); // This succeeds

            m_pButton->modify_font (*new_font); // This doesn't !

 

            delete new_font;

        }

    }

}

 

You can probably see that the progress bar's font gets successfully changed,

whereas the button's font doesn't (not even if I move the main window, or

drag something else across it to force a re-draw).  I've tried building this

app under Linux (using gcc and gtk-x11) and I've also built it for Windows

(using MSVC++ and gtk-win32).  I get the same result in both cases so I'm

guessing that I must have missed out a stage that's needed to update the

button.

 

Should I have called something else that would force the button to use the

new font?

 

John