Review Request: Improve KColorChooser dialog color preset selection implementing a custom ItemDelegate

[Darío Andrés]

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http://reviewboard.kde.org/r/3410/
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Review request for kdelibs.


Summary
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Do not use the QPalette::Highlight color to show the selected color preset in the KColorChooser dialog. 

Use a custom selection drawing, black or white (depending on the contrast with the original color (KColorUtils::constrastRatio > 3.5))
This way you get a "this color is selected" hint, but you are still able to see which color it was/is

My last choice was a centered empty circle. Drawing a rectangle (or dotted rectangle) had too much glitches as the color preset buttons in the tableview are small (~ 13x13 pixels)
Also, there is a bug (not caused by me) that reduces the color preset buttons height or width (by one) on the top/left borders (seems to be related to the QTableWidget without Headers..)

I tried to not use color shading as it is still confusing to the user...

As a gift, I added a small detail in the empty buttons (no color defined), drawing a cross on it (using the background color)

Attached screenshot: can you recognize the selected color in the first one ? (hint: the same color is selected in both screenies..)


This addresses bug 230524.
    https://bugs.kde.org/show_bug.cgi?id=230524


Diffs
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  svn://anonsvn.kde.org/home/kde/trunk/KDE/kdelibs/kdeui/colors/kcolordialog.cpp 1107102 

Diff: http://reviewboard.kde.org/r/3410/diff


Testing
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It works Ok and it looks good (ok, it could be prettier, any ideas? may be a gradient?)
At least it doesn't block the real color.


Screenshots
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Before and After my patch
  http://reviewboard.kde.org/r/3410/s/340/


Thanks,

Darío