The GtkFontSelectionDialog widget is a dialog box for selecting a font.
To set the font which is initially selected, use set_font_name().
To get the selected font use get_font_name().
To change the text which is shown in the preview area, use set_preview_text().
GTK2.FontSelectionDialog("Select a font")
inherit GTK2.Dialog : Dialog
GTK2.FontSelection()->set_preview_text()
