Review Request 112079: Add utility function to paint icon overlays

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This review has been submitted with commit 4433027b85e199f11a91ae0736f6a65e78177772 by Martin Klapetek to branch frameworks.

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On Aug. 26, 2013, 12:07 p.m., Martin Klapetek wrote:
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> http://git.reviewboard.kde.org/r/112079/
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> (Updated Aug. 26, 2013, 12:07 p.m.)
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> 
> Review request for KDE Frameworks.
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> Description
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> As this was rejected from QIcon, I decided to implement it in frameworks. The idea is new private icon engine (KOverlayIconEngine), which paints the overlays itself, and then an utility function in KIconUtils:: namespace, which takes the base icon and the overlay icons as parameters and constructs new QIcon using KOverlayIconEngine. As QPixmapIconEngine (QIcon default) is private in Qt and couldn't be simply extended, the KOverlayIconEngine simply forwards the calls to QIcon, which then forwards those calls internally to QPixmapIconEngine (QIcon is really mostly just a wrapper around an engine).
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> There are two functions
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> QIcon KIconUtils::kIconAddOverlay(const QIcon &icon, const QIcon &overlay, Qt::Corner position);
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> and
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> QIcon KIconUtils::kIconAddOverlay(const QIcon &icon, QHash<Qt::Corner, QIcon> overlays);
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> The first one serves for single overlay icon, the second one is then for multiple overlays, requires the QHash to be built up before passing though.
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> Diffs
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>   staging/kguiaddons/autotests/CMakeLists.txt d6b952c 
>   staging/kguiaddons/autotests/kiconutilstest.h PRE-CREATION 
>   staging/kguiaddons/autotests/kiconutilstest.cpp PRE-CREATION 
>   staging/kguiaddons/src/lib/CMakeLists.txt e62087b 
>   staging/kguiaddons/src/lib/util/kiconutils.h PRE-CREATION 
>   staging/kguiaddons/src/lib/util/kiconutils.cpp PRE-CREATION 
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> Diff: http://git.reviewboard.kde.org/r/112079/diff/
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> Testing
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> I have a small testing app with 3 QLabels, testing both ::paint() and ::pixmap() methods, all works \o/ I'm thinking about bundling the app with kguiaddons and/or additionally creating a unittest for it (I have one for Qt already), but I'll do that later as I'm off to vacation and I'd like to get comments for the code.
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> Thanks,
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> Martin Klapetek
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>

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