Hi,
I setup a very simple fltk GUI with Fl_Window that has a Fl_Menu_Bar and an
Fl_Gl_Window. I have the following items in my menu (which is called mbar):
mbar->add("ChangeSquareColors/Make Square Red", 'r',
(Fl_Callback*)TopSide_GUI::cb_MakeSquareRed, (void*)0, 0);
mbar->add("ChangeSquareColors/Make Square Blue", 'b',
(Fl_Callback*)TopSide_GUI::cb_MakeSquareBlue, (void*)0, 0);
Inside of my Fl_Gl_Window draw() function, I just draw a square that is red or
blue according to a variable that is set with the callback functions from the
menu.
But I am running into something that confuses me. If I use a mouse to click on
the menu and choose one of the items, then it automatically calls the draw()
function of my Fl_Gl_Window. But if I use the shortcuts 'r' or 'b', it changes
the local variable but does not call the draw() function. Why is clicking on
the menu different than using the kayboard shortcuts? And how does my
Fl_Menu_Bar "know" that there is a Fl_Gl_Window to draw? This seems very weird
to me...
Thanks
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