Effective size of drawing area

Assume that:

window default size is 300x300

window has box with menu bar and drawing area:

box = new Gtk::Box(Gtk::ORIENTATION_VERTICAL);
box->pack_start(menuBar, Gtk::PACK_SHRINK);
box->pack_start(*darea, Gtk::PACK_EXPAND_WIDGET);

What is and how to determine the size of area where I can actually do all drawing?

Krzysztof J.

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