I am trying out FLTK for the first time, and it looks like buttons do not seem to change visually when the mouse cursor is over them. Is there a way to make buttons change visually on mouse-over/mouse-out?
Sure, you can do that, but it isn't done by default because that sort of visual feedback tends to be neither "fast" nor "light" so fltk widgets don't have that as a stock feature.
That said, some of the test folder demos do have that (not sure which ones, off the top of my head, but maybe the subwindow for one) and I'm pretty sure Greg has demos for this on his "Cheat sheet".
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