I recently started learning C++ and wxWidgets and now I'm building a calculator program. I have a grid sizer with buttons and I want to know is it possible to change the font of the whole sizer instead of changing the font of every single button?
Sizers are not windows and so don't have any font, so, no, you can't just call SetFont() on a sizer. You can iterate over all sizer items and call SetFont() on each item which is a window. Or, somewhat less efficiently (because you "waste" a window), but more conveniently, you can make all your button children of a wxPanel and associate the existing sizer with this panel. Then you'd be able to call SetFont() on the panel, which is a window, and so would propagate the font change to all of its children by default.