Review Request 122861: Micro-optimize LayoutManager

[Sebastian Kügler]

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Ship it!


Ship It!

- Sebastian Kügler


On March 8, 2015, 9:08 p.m., Kai Uwe Broulik wrote:
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> https://git.reviewboard.kde.org/r/122861/
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> (Updated March 8, 2015, 9:08 p.m.)
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> Review request for Plasma.
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> Repository: plasma-desktop
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> Description
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> This micro-optimizes the LayoutManager by:
> - using Array and Object literals rather than new Object/Array, and also creating the whole structure at once if applicable
> - Store end values in for loops rather than calculating them on each iteration
> - Adjust coding style here and there
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> Diffs
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>   containments/desktop/package/contents/code/LayoutManager.js 14d0dfc 
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> Diff: https://git.reviewboard.kde.org/r/122861/diff/
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> Testing
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> Moving applets (especially using Eike's press-and-hold when using it on a touchscreen :P) feels snappier, doesn't print any new warnings on console and seems to work as before. However, I can no longer cause plasmashell to go berserk when moving a small applet ontop of a huge one (eg. small sticky note on wide fuzzy clock) where it desperately tries to find a place and fails.
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> I think the grid size should be based on units somehow, having a 24x24 grid on a high dpi screen also benefits the aforementioned behavior.
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> One surprising discovery I made is that using Qt.point instead of a handcrafted JS Object is one order of magnitude(!) slower.
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> Thanks,
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> Kai Uwe Broulik
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