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What should I return when overriding
virtual bool Gtk::Widget::on_draw(const Cairo::RefPtr<Cairo::Context>& cr)
Indeed, the C documentation doesn’t say anything either. You should report this oversight as a bug on bugzilla.gnome.org.
Perhaps it is the same as other event signals in GTK? That is, return
TRUEto stop other handlers being invoked,FALSEto propagate the event further? Even though it’s not an event signal, its predecessor in GTK 2 was, perhaps it’s for backwards compatibility? A quick glance at the source code ofGtkButton, for example, shows that it simply returnsFALSE.