[KDE/Mac] Review Request 126291: initial implementation of a platform plugin for OS X (WIP)

[René J.V. Bertin]

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https://git.reviewboard.kde.org/r/126291/
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(Updated Feb. 14, 2016, 5:44 p.m.)


Review request for KDE Software on Mac OS X and KDE Frameworks.


Changes
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Updated for the current source and tested against FWs 5.19.0

It would be nice to get some feedback on this one, if not simply a simple "Ship It" ...


Repository: kwindowsystem


Description
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KWindowSystem has been lacking a platform plugin for OS X. This RR presents a "backport" of the modified KDE4 KWindowSystem implementation that has been used in the MacPorts kdelibs4 port for the last 2 or 3 (or more) years.

I have made some initial steps to remove deprecated Carbon API calls, but this is clearly a work in progress.

Open questions include
- is there any justification to run an event handler (or Cocoa observer) to keep track of running applications, possibly even listing all their open windows?
- is there any use for the Qt event listener framework (cf. the NETEventFilter in the X11 plugin)? I haven't yet had time to try to figure out what this "could be good for", and am very open to suggestions in this departments.
- one application for such an event filter would be a listener that catches the opening and closing of all windows by the running process, and keeps track of their `WId`s. A new method could then be added (to `KWindowInfo`?) to distinguish `WId`s created by the running application from "foreign" ones (useful also on Wayland and MS Windows).

`KWindowSystem::setMainWindow` should become a front for payload provided by the plugins. I'll leave that to the regular/official maintainer(s) of this framework.

This code could probably do with *lots* of comments; I'll try to add them as questions about this or that bit of code arise.


Diffs (updated)
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  src/kwindowsystem.cpp 407a67d 
  src/platforms/osx/CMakeLists.txt 4fc3347 
  src/platforms/osx/cocoa.json PRE-CREATION 
  src/platforms/osx/kkeyserver.cpp 3ddb921 
  src/platforms/osx/kwindowinfo.cpp e8555bb 
  src/platforms/osx/kwindowinfo.mm PRE-CREATION 
  src/platforms/osx/kwindowinfo_mac_p.h c8f307e 
  src/platforms/osx/kwindowinfo_p_cocoa.h PRE-CREATION 
  src/platforms/osx/kwindowsystem.cpp 1758829 
  src/platforms/osx/kwindowsystem_mac_p.h PRE-CREATION 
  src/platforms/osx/kwindowsystem_macobjc.mm PRE-CREATION 
  src/platforms/osx/kwindowsystem_p_cocoa.h PRE-CREATION 
  src/platforms/osx/plugin.h PRE-CREATION 
  src/platforms/osx/plugin.cpp PRE-CREATION 

Diff: https://git.reviewboard.kde.org/r/126291/diff/


Testing
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On OS X 10.9.5 with Qt 5.5.1 and frameworks 5.16.0 .


Thanks,

René J.V. Bertin

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