Review Request 124042: Fix for KoResourceItemView flickering due to content resize and scrollbar appearing

[Boudewijn Rempt]

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Ship it!


Ship It!

- Boudewijn Rempt


On June 20, 2015, 8:54 a.m., Stefano Bonicatti wrote:
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> https://git.reviewboard.kde.org/r/124042/
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> (Updated June 20, 2015, 8:54 a.m.)
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> Review request for Calligra.
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> Bugs: 344968
>     http://bugs.kde.org/show_bug.cgi?id=344968
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> Repository: calligra
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> Description
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> When vertically resizing a KoResourceItemView and the vertical scrollbar appears, the tiles that represents the items are resized to fit the viewport with their width, but this also reduces their height making the scrollbar not needed again.
> The scrollbar disappearing lets the viewport expand and so the tiles, in height, making the scrollbar needed again and this loops forever generating a considerable slowdown.
> 
> The fix consists in always showing the vertical scrollbar so that no resizing happens due to them.
> This is extended also in the other cases, where rows are fixed and a horizontal scrollbar is used, or when scrollbar appearing should be dynamic.
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> To avoid unnecessary work and event spam i've added check in KoResourceItemChooser::setSynced function if the value passed corresponds to its current status already.
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> Fixed also a small typo while i was at it.
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> Thanks to mmolch for pointing in the right direction with his patch.
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> Now this patch is on review not only because changes a calligra class, but because when a part of it was first proposed, it apparently still created some issues to the bug reporter, so it would be better to test it more.
> krita-presetdockerflickering-bonicatti branch contains this patch.
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> Diffs
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>   libs/widgets/KoResourceItemChooser.cpp d1e3f89 
>   libs/widgets/KoResourceItemView.cpp f933b9c 
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> Diff: https://git.reviewboard.kde.org/r/124042/diff/
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> Testing
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> Tested resizing in the special condition and had no flickering or performance hit.
> The original bug reporter said that he was unable to properly resize the main krita window (with XFCE), but i had none of those problems (using KDE).
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> Thanks,
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> Stefano Bonicatti
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