feature request: support OS X 10.6 about ui

[andlabs]

Unfortunately I tried this already and it didn't work out.

There are several features of 10.7 that I now rely on already, namely alignment rects and baseline heights. I will later add NSPopover as well (see issue #36).

Furthermore, an error in Apple's header files means using the feature availability macros (MAC_OS_X_VERSION_MIN_REQUIRED/MAX_ALLOWED) to specify 10.6 makes including AppKit/NSApplication.h impossible. I needed to use a bad hack to bypass that (include everything else before that, then temporarily change to 10.7 and include NSApplication.h, then switch back and include files that include that one). Now I'm including just Cocoa/Cocoa.h, which means using that hack again will make things MUCH more problematic (prior to that I was including individual header files).

However, it's the new alignment stuff that really kills it. Sorry :/

[notnot]

That's a pity. It would be nice if ui ran on all versions of OS X that Go
runs on.
What happens when you run a binary using package ui on OS X 10.6? Will it fail
at load time, or later, as soon as some missing functionality is
encountered?

[andlabs]

I'm not sure. It'd probably fail at load time because OS X is very bad at telling you that a binary was compiled for a newer version of the system when not in an app bundle; if you do get father you'll get an exception that -[NSView baselineOffsetFromBottom] or some other NSView selector is undefined. (Note that right at this moment the functionality is disabled, but will be readded when I implement the Form layout.)