Hi Martin
Doing a stripped down example is something I definitely want to do, but at
the moment the bug is triggered by a complex custom widget (that I can't
release publicly anyway) so and too I'm backed up against deadlines to try
and do it just now.
I might have to release my app with the offsetHeight reference in it - in
which case, I'd like to run some comparative tests first. When qx.html was
developed, were there a series of performance tests developed with it and
are they still around?
Thanks
John
From: Martin Wittemann <[email protected]>
Reply-To: qooxdoo Development <[email protected]>
Date: Wed, 2 May 2012 09:28:28 +0200
To: qooxdoo Development <[email protected]>
Subject: Re: [qooxdoo-devel] Chrome redraw problem, fixed by referencing
element.offsetHeight in qx.html.Element
Hello John,
> It is possible to make the element be visible simply by adding a line to
> qx.html.Element.flush() to reference element.offsetHeight immediately after
> setting the element.style.display. This is reliably reproducible in my test
> case although the app is not small and concise enough for a playground demo
> right now.
>
> As a fix this works well, but I'm wondering whether always referencing
> offsetHeight would cause a performance degradation, and are there any tools in
> the Qooxdoo kit to test it?
Querying offestHeight triggers a redraw of the browser and with that, can
sure decrease performance. One reason we introduced the qx.html layer is to
prevent the redraw of the browser so triggering a flush is somehow against
the basic idea of the queue. But the issue seems to be interesting and
should be fixed in the framework it the source of the bug is in the
framework itself. Do you plan to strip your app down to a playground sample?
Regards,
Martin
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