Peter Dimov wrote:
window make_graph_widget() { windows w; w.on_draw = &draw_the_graph; w.on_mouse_click = &handle_click; w.on_mouse_right_click = &handle_right_click; return w; }
and isn't this too complex a solution?
No. The alternative solution is comparable in complexity,
Well, except for impicit *this pointer, which makes member function a bit easier to write.
and as soon as you add another graph widget that has different left or right click behaviors, or make w change its appearance dynamically on response to a combo box cb (by just assigning different drawing functions to w.on_draw in cb.on_change), you'll see why the event-based model is superior.
Good point. Okay, if I ever get to implement my graph drawer and the proposed library will be mature enough, I'll see how this approach works out.
It's not a new invention, just look at Delphi.
Last time I tried, a click on event created a method linked to that event. Ah... nothing prevents me to implement 'on_draw' as member functions bound to the signal. Yes, that's definititely similiar. - Volodya