Make OakTabBarView accessible

[dusek]

In short: VoiceOver users can browse the tabs, switch between them with the default action (press), invoke context menus on them, and learn if a tab indicates whether a file is modified or not.

Released in public domain by my employer, BRAILCOM,o.p.s.

[sorbits]

Great work (again), pulled as 1bcdf4a (with just some minor formatting changes).

How do you bring up the context menu for the tabs (with VO enabled)?

[dusek]

Thanks again for reviewing and pulling.

W.r.t. the context menu - I am using the showMenu:inRect:withSelectedIndex:font:popup method (I think it's a method of OakControl, not OakTabBarView itself) after I set the tab's tag on the OakTabBarView. You can search for NSAccessibilityShowMenuAction (or simply for showmenu) in the diff and see the 3 lines of code that follow the last occurence of that string in the diff (lines 467-469).

[sorbits]

Sorry, what I meant was, what key equivalent causes VO to bring up this menu (send NSAccessibilityShowMenuAction)?

[dusek]

The key equivalent is VO-Shift-M ("VO" stands for Ctrl+Option, it's a standard prefix for all VoiceOver shortcuts). It's a "variation" on VO-M, which goes to the main menu.