For efficiency,i don't want put these codes in
MyDrawingArea::on_expose_event().
I need a fixed size window,so i only need execute these code once,not every
time.
but i still cann't put them in construction method,where should i put them?
allocation=get_allocation(); //allocation,cr,gc are data members of
MyDrawingArea:public Gtk::DrawingArea
cr = get_window()->create_cairo_context();
gc=Gdk::GC::create(get_window());
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