- cairo_text_extents_t ext;
- cairo_text_extents (cr, tab.group->name().c_str(), &ext);
+ Glib::RefPtr<Pango::Layout> layout;
+ layout = Pango::Layout::create (get_pango_context ());
+ layout->set_ellipsize (Pango::ELLIPSIZE_MIDDLE);
+
+ layout->set_text (tab.group->name ());
+ layout->set_width ((tab.to - tab.from - arc_radius) * PANGO_SCALE);
+ layout->get_pixel_size (text_width, text_height);
+
+ cairo_move_to (cr, (get_width() - text_height) * .5, (text_width + tab.to + tab.from) * .5);
+
+ Gtkmm2ext::Color c = Gtkmm2ext::contrasting_text_color (Gtkmm2ext::rgba_to_color (r, g, b, a));
+ Gtkmm2ext::color_to_rgba (c, r, g, b, a);
+ cairo_set_source_rgb (cr, r, g, b);