Review Request 115459: Introduce runtime platform support in KWindowSystem

[Martin Gräßlin]

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https://git.reviewboard.kde.org/r/115459/
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Review request for KDE Frameworks, kdewin and Alexander Richardson.


Repository: kwindowsystem


Description
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Introduce runtime platform support in KWindowSystem

This is a change similar to the one in KWindowInfo, but with variation
to the pattern due to the static container.

There is now a generic implementation of KWindowSystem which is
completely windowing system platform independent. This implementation
delegates all methods into a KWindowSystemPrivate class.

Each windowing system platform implementation needs to provide a
subclass (e.g. KWindowSystemPrivateX11) and provide all the methods
which are delegated. Note that there are no virtual methods defined,
instead the d-pointer gets casted into the proper type. Thus if a
method is not provided it will end in a compile error.

To make use of a platform implementation it needs to be included in
the ctor of KWindowSystemStaticContainer and the PlatformImplementation
enum needs to be extended by a value for the platform. This is used in
the D macro to cast and delegate correctly.

There is a dummy implementation for all not supported windowing system
platforms.

This change also includes some API changes:
* KWindowSystem::windows() returns a copy instead of const-ref
* All methods are provided, there is no longer X11 specific methods
* private methods and enums are removed

NOTE: This change breaks the implementation for Windows and Mac OS!
They are currently excluded from build.


Diffs
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  src/kwindowsystem_p.h PRE-CREATION 
  src/kwindowsystem_p_x11.h PRE-CREATION 
  src/kwindowsystem_x11.cpp 0556ec6bff7b1b5b70018758c984906687890911 
  src/CMakeLists.txt 23133d581944a8373b9b753b300d97054b7d6f18 
  src/kwindowinfo.cpp 790c4458075ff0ddc22102111e2d96f8c636f0ee 
  src/kwindowsystem.h 6c2338e28ae8bb9763dfcf14eeb239bdaebda73d 
  src/kwindowsystem.cpp PRE-CREATION 

Diff: https://git.reviewboard.kde.org/r/115459/diff/


Testing
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Unit tests still succeed for X11, but they are not complete, though the most important aspects are tested.


Thanks,

Martin Gräßlin

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