[PyQt] Issue with touch panel and QWebEngineView since upgrading PyQt5.8 -> 5.10

[Brian Knudson]

On Tue, Aug 14, 2018 at 2:12 PM, Phil Thompson <phil at riverbankcomputing.com>
wrote:

> On 14 Aug 2018, at 7:09 pm, Brian Knudson <brian.knudson at cxcsimulations.
> com> wrote:
> >
> > Ooops.  I somehow sent that last message while trying to type "PyQt".
> Not quite sure how that even happened.  Let's try that again.
> >
> >
> >
> > Hello all,
> >
> > I have an application that uses QWebEngineView to render its main UI.
> The html page rendered by QWebEngineView relies on a lot of Javascript and
> CSS, and has been working well for a year or so while using PyQt5.8.1.  I
> recently moved to PyQt 5.10.1 and am now having problems when using a
> consumer grade touch panel (Planar or Viewsonic or the like) to control the
> application.
> >
> > In the html UI, there is a '+' and a '-' on which the user can tap to
> change a number.  With PyQt5.8.1, the user can tap as fast as they'd like.
> With 5.10.1, if they tap too fast (not impossibly fast, but just quick
> tapping), they loose the ability to tap. Occasionally, the number will
> continue to increment after the ability to tap is lost.
> >
> > I can get the ability to tap back if I click the '+' or '-' with the
> mouse.  I suspect doing so is giving the "mouse up" that seems to have
> gotten lost with fast tapping.
> >
> > Because I don't have both versions of Qt and PyQt installed on the same
> machine, to test this, I compiled my app with PyInstaller 3.2.1 on each
> machine, then copied the executables around to several other machines
> (running both Windows 7 and 10). On every machine, the one compiled with
> PyQt 5.10.1 showed the "lost ability to tap" issue, while the one compiled
> with PyQt 5.8.1 worked as expected.
> >
> > I should note that this is commercial PyQt, so it's compiled from
> source.  I used Visual Studio 2015 on Windows 7 to compile PyQt 5.8.1, and
> Visual Studio 2017 on Windows 10 to compile PyQt 5.10.1.
> >
> > This issue is on Windows.  This app isn't cross platform, so I haven't
> tested on other OSs.
> >
> > I wonder if anyone has seen this or has a suggestion as to where to
> start looking for a solution.
>
> You haven't mentioned the version(s) of Qt involved.


working as expected:
PyQt 5.8.1 / Qt 5.8.0 / SIP 4.19.1 on Windows 7. PyQt compiled with Visual
Studio 2015

loses tap ability after tapping too quickly:
PyQt 5.10.1 / Qt 5.10.1 / SIP 4.19.8 on Windows 10. PyQt compiled with
Visual Studuio 2017
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