Hiho there, I was wondering how to implement support for QSystemTrayIcon label feature we have here on OS X in Qt. For those of you who are not familiar with this feature it's an optional text label on the right to the tray icon ( http://i.imgur.com/c98Nn08.png — red rectangle).
After a discussion with thiago and richmoore1 on IRC, I got the whole picture of the problem. So, here we go. In Cocoa, tray icon is represented with NSStatusItem, which is created and maintained in QCocoaSystemTrayIcon (a child of QPlatformSystemTrayIcon interface), which is itself created somewhere in qpa cocoa plugin. So by introducing QCocoaSystemTrayIcon::setTitle(const QString&) we could implement the feature itself. The problem appears when we try to use it in public API. As you might noticed, QSystemTrayIcon's public API has nothing to do with QPlatformSystemTrayIcon at all. A possible solution would be to add a public API method QSystemTrayIcon::setTitle(const QString&), that would actually work on OS X only, but that's not the way to go (we don't want platform-wise features in public api, yeah?). Then the only visible solution I can think of is adding a friendly class to QtMacExtras, which will access private d-pointer of passed QSystemTrayIcon* instance, in order to get its QPlatformSystemTrayIcon (later casted to QCocoaSystemTrayIcon). Still I am not sure what's the way to go here. So guys, what do you think?
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