[KDE/Mac] Review Request 120403: [OS X] adapting KMenu::addTitle to OS X menubar specifics

Sun Sep 28 21:11:02 UTC 2014

> On Sept. 28, 2014, 5:13 p.m., Thomas Lübking wrote:
> > kdeui/widgets/kmenu.cpp, line 182
> > <https://git.reviewboard.kde.org/r/120403/diff/1/?file=315609#file315609line182>
> >
> >     try to avoid negated bools unless for performance or readability reasons (ie. you'd need "!flag" a lot otherwise)

isNOSXMenuBar? ;)

> On Sept. 28, 2014, 5:13 p.m., Thomas Lübking wrote:
> > kdeui/widgets/kmenu.cpp, line 189
> > <https://git.reviewboard.kde.org/r/120403/diff/1/?file=315609#file315609line189>
> >
> >     As mentioned before, the parentship is pretty meaningless here. A popup *might* be parented by a window that has it in its menubar, but doesn't have to at all.

Not necessarily at "this moment", but I've only seen menubars attached to windows until now ...

> On Sept. 28, 2014, 5:13 p.m., Thomas Lübking wrote:
> > kdeui/widgets/kmenu.cpp, line 186
> > <https://git.reviewboard.kde.org/r/120403/diff/1/?file=315609#file315609line186>
> >
> >     parsing associatedWidgets (eg. a QMenu or a QMenuBar or a QToolButton) is a good idea, but what you want to do is to search yourself through pot. QMenu's until one ::menuAction() is associated to a QMenuBar (ie. "this menu can be reached by navigating through a menubar and its menus)

I think you've lost me a bit here. Not to appear dumb or lazy, but how does one do that? Are we looking at a recursive function that gets called for each QMenu encountered (starting with 'this', calling itself afterwards) and cycles through all that QMenu's ::menuAction()->associatedWidgets, until we hit a widget for which `qobject_cast<QMenuBar*>(w) != NULL`?
(Or is there a better way to check the type of a QWidget?)

(AAArrgggh, all this would be much simpler if KDevelop would stop exitting for no apparent reason and without any error message like it just did, again)

> On Sept. 28, 2014, 5:13 p.m., Thomas Lübking wrote:
> > kdeui/widgets/kmenu.cpp, line 191
> > <https://git.reviewboard.kde.org/r/120403/diff/1/?file=315609#file315609line191>
> >
> >     If I understand the Qt doc correctly, there're basically two kinds of menubars:
> >     1) per window
> >     2) shared
> >     
> >     however, they all will end up as global menu?
> >     
> >     Even if not:
> >     how many menubars are not mapped to the global one (the I could think of Qt Designer forms) and are those false positives actually worth the false negatives (ie. you miss special casing a menu)?

For the moment we're talking KDE, not (pure) Qt apps. The only KDE app I know that uses per-window menus even on OS X is konsole. And it doesn't use KMenu::addTitle.

What's your point? That in the end I might be better off just emulating the title rendering for all popup menus, even if they actually could render the "official" style?

- René J.V.

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On Sept. 28, 2014, 2:46 p.m., René J.V. Bertin wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/120403/
> -----------------------------------------------------------
> 
> (Updated Sept. 28, 2014, 2:46 p.m.)
> 
> 
> Review request for KDE Software on Mac OS X, kdelibs and Qt KDE.
> 
> 
> Repository: kdelibs
> 
> 
> Description
> -------
> 
> This is a spin-off of RR https://git.reviewboard.kde.org/r/120355/
> 
> As described in that RR, OS X cannot render menu items that were created using `KMenu::addTitle`. Without a Qt patch, that function will even provoke a crash. With a patch, the items are rendered barely legibly once, and then render as empty space in subsequent menu openings.
> The main object of that RR is to present and discuss a workaround at the client level, emulating `KMenu::addTitle`. In this RR, I present a draft adaptation of that function itself.
> 
> The main goal as I see it is to modify the function just enough so that it changes its behaviour for items that will or can be rendered in the Mac's global menubar, using non-Qt code. Pop-up menus that are not attached to that structure are rendered through Qt and can show all the style formatting they can under Linux as long as it's not tied to X11 directly.
> It's probably impossible to cater to all possible use cases, so I'd propose to focus on the situations we can detect from inside `KMenu::addTitle`. That is, *if* we want to ease the client's burden of obtaining a sensible menu item *and* we want to maintain support for the intended/expected style in the menus that can actually support them. (KDevelop's context menu its Project view is a prime example.)
> The other goal (secondary for KDE/Mac for the time being) is to come up with a patch proposal for Qt5's `QMenu::addSection`, because its current use of texted separators makes it equivalent to `QMenu::addSeparator` on OS X. (= you get a separator instead of an item showing the title text.)
> 
> I have not found a way to detect reliably that a menu is attached to the global menubar. There are functions that are supposed to allow this (KMenu::isTopLevelMenu, QMenu::macMenu) but they don't work as expected. So what I propose here is to emulate the styled menu title when adding to a KMenu that is somehow associated to a KMenu belonging to a KMainWindow that has a menubar. This can probably lead to false hits, and I have already learned that it doesn't catch all the intended cases either (e.g. MessageList->Sorting menu under KMail's View menu is apparently not yet attached when addTitle is called). So I'm following Thomas's suggestion to publish the draft for feedback.
> 
> In case anyone wonders about the emulation code (when notMacMenuBar==false): I'm open for suggestions but this is the only approach I've found to create an entry that stands out. It's not impossible to to obtain the font OS X uses for menubar menu items (Lucida Grande 14; requires 2 extra functions), but changing font attributes (bold, underline, overline etc) has no effect. (The bold font version file is available, so it might be possible to get the bold font rendered by specifying it as a full font spec and not as an attribute but I wouldn't know how to achieve this.)
> 
> 
> Diffs
> -----
> 
>   kdeui/widgets/kmenu.cpp 7dab149 
> 
> Diff: https://git.reviewboard.kde.org/r/120403/diff/
> 
> 
> Testing
> -------
> 
> On OS X 10.6.8 with kdelibs git/kde4.14 . Currently the draft does nothing on other OSes, and the actual "emulation" code (when notMacMenuBar==false) can go conditional if there are no other platforms where a similar approach could be desired.
> 
> 
> Thanks,
> 
> René J.V. Bertin
> 
>

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