infinite scroll - gtkmm Gtk::Layout negative child position not setting its absolute position -

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the description of gtk::layout says

infinite scrollable area containing child widgets and/or custom drawing

i put gtk::layout inside gtk::scrolledwindow, gave gtk::layout size of 400x400 , placed gtk::button @ (450, 450), scrollbars appeared until scrolled window resized 400x400, not (450+button-width x 450+button-height). had move bottom-right corner of layout connecting handler button's signal_size_allocate() signal , manually call gtk::layout::set_size() function resize button's boundary. scrolled window shows scrollbars reach button. ok.

class layoutwindowtest : public applicationwindow {     scrolledwindow sw;     layout l;     button b; public:     layoutwindowtest()     : l(), b("test") {         set_title("layout test");         set_size_request(400, 400);         sw.set_hadjustment(l.get_hadjustment());         sw.set_vadjustment(l.get_vadjustment());         l.set_size(400, 400);         sw.add(l);         add(sw);         // b.get_allocation() won't work because button has not been allocated         // size yet         b.signal_size_allocate().connect(         [this](allocation& btn_sz) {             l.set_size(btn_sz.get_x() + btn_sz.get_width(),                        btn_sz.get_y() + btn_sz.get_height());         });         l.put(b, 450, 450);         show_all_children();     }      virtual ~layoutwindowtest() {} };

initial window showing scrollbars , scrolled bottom-right corner show button

initial window showing scrollbars scrolled bottom-right corner show button

now need same thing top-left corner, i.e. put button out of visible boundary of scrolled window , use scrollbars reach button. tried putting button @ (-10, -10), unlike previous case can't set layout's top-left corner code resizing it, can't move layout's scrollbars. when resize scrolled window manually top-left corner button moves towards top-left instead of staying there. how remedy situation?

initial window button @ (-10, -10) , no scrollbars, tried resizing window top-left handle button moves it

initial window button @ -10,-10 button moves window when resizing it

in short, how can scroll in both top-left , bottom-right directions infinitely?


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