Oh I see. And then pinch on the trackpad just generates a overall MouseWheel event, not a specific zoom-in event. For some reason, I thought there was a different event depending on operating systems. Before, Linux would trigger <Button-4> and <Button-5> events and not MouseWheel.

On Jul 22, 2014, at 12:35 AM, Ned Deily <report@bugs.python.org> wrote:

> 
> Ned Deily added the comment:
> 
> "However, I figure I still need to create separate bindings for Linux,
> "Windows and Mac, right? Or does Tkinter unify all the mousewheel events?
> 
> I'm not sure I understand: I think that Tk only provides one MouseWheel event binding.  Keyboard or menu items might differ, yes, e.g. Cmd-+ vs Ctrl-+.
> 
> http://www.tcl.tk/man/tcl8.5/TkCmd/bind.htm#M9
> 
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> <http://bugs.python.org/issue21933>
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