c++ - FLTK: Event when a window gets focus on MacOS -


using fltk, i'm writing desktop application uses multiple windows. application manages list of open windows , shows them in menu these lines:

for( int = 0; < windows.size(); ++i ) {     menu->add(("&windows/"+windows[i].name).c_str(), 0, mymenucallback); }

now want set checkmark in front of name of top-most window:

flags = fl_menu_toggle|fl_menu_value; menu->add(("&windows/"+windows[i].name).c_str(), 0, mymenucallback, 0, flags);

i'm stuck @ installing event handler gets called whenever top-most window changes. hoping fl::add_handler( &genericeventhandler ); called whenever focus changes, not case. so, question is: how notified, when focus of windows changes?

you should subclass fl_window override handle method monitor fl_focus , fl_unfocus events. here sample:

class mywindow : public fl_window { public:     mywindow(int x,int y,int w,int h, const char* title) : fl_window (x, y, w, h, title) {}      int handle(int e) {         switch(e) {             case fl_focus:                 std::cout << "window " << label() << " focused" << std::endl;                 break;             case fl_unfocus:                 std::cout << "window " << label() << " has lost focus" << std::endl;                 break;         }         return(fl_window::handle(e));     } };  int main() {     mywindow win1(100, 100, 200,200, "window 1");     win1.show();      mywindow win2(350, 100, 200,200, "window 2");     win2.show();      return fl::run(); }

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