Ned Deily added the comment:
Lita, I tried the patch. From the perspective of an OS X user, while I might
expect that using the zoom gesture on a mousepad or using a mousewheel (the
equivalent) to increase or decrease the font size, I would even more expect
scrolling to work especially if scrollbars are present. Clearly, scrolling is
more important so, if it is not possible to bind Tk mousewheel events without
affecting scrolling, I would abandon the mousewheel. On OS X, the standard way
to provide size adjustment (of fonts or images) is to provide "Bigger" or
"Smaller" menu items with the standard keyboard shortcuts of
Command-Shift-Equal (and Command-Equal) which is displayed as "Command +" (so
the user on a US keyboard just presses the Command key and the =/+ key) and
Command-Hyphen ("Command -"). The Apple OS X Human Interface Guidelines go
into more detail and you can see these shortcuts in action in many standard OS
X applications (TextEdit, Mail, Safari, etc). As it stands today, turtledemo
does not
use the standard OS X menu bar where these commands would normally be placed.
And that's a bit of a separate problem because since turtledemo doesn't change
the root menu it defaults to a Tk-provided one which includes things "Run
Widget Demo" under the file menu. To be a proper OS X app, turtledemo should
customize the menu, at least removing the widget demo item and then it could
add the Bigger and Smaller menu items to a Format menu. Actually, the
turtledemo Examples and Help pulldown options would ideally also be available
in the standard menu hierarchy. I'm not suggesting that is a requirement but
that's what I think an OS X user would expect and what the Apple HIG would
require.
https://developer.apple.com/library/mac/documentation/userexperience/conceptual/applehiguidelines/KeyboardShortcuts/KeyboardShortcuts.html
https://developer.apple.com/library/mac/documentation/userexperience/conceptual/applehiguidelines/Menus/Menus.html
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