On Thu, Oct 2, 2014 at 10:10 PM, Hugo Pereira Da Costa <hugo.pere...@free.fr > wrote:
> hi all, > > I guess its a question to Qt experts or possibly low level KF5 experts. > > When comparing debugging outputs when running app + style against Qt4 and > Qt5, I've noticed the following significant difference. > In Qt4, as far as I can tell, QStyle was only instanciated one per QApp, > and deleted at the end. > In Qt5 this seems not to be true anymore and I've seen up to 6 QStyle > running concurently for a single Kate Window, increasing to 13 when opening > 'open file' dialog, decreasing back to 6 when closing it, etc. > Is this a known feature ? Will this stay ? > > (I'm running a rather old checkout of Qt-5.4) > > If yes, there need to be some design change in Oxygen (as well as in > breeze), to use singletons rather than QStyle's QObject's children for many > things, with regard for instance caching, configuration, and even possibly > even filters, otherwise I foresee quite some overhead ... > > Information welcome, > > Best regards, > > Hugo > Hi Hugo, Thanks for looking into this! :) I would recommend to start by adding a breakpoint on the style's constructor to see who is calling it. To me it sounds like a bug in Qt, but it needs investigation. Aleix
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