[PyQt] cursor icon not changing over QSplitter [Mac OSX]

[Timothy W. Grove]

On 20/09/2015 10:21, Rembrand (daxLAB Limitted) wrote:
> If it was the GIL then your app would not respond at all if clicking 
> on  or hovering  over a button for example.  I have not come across 
> this issue and  have more or less the same setup (using VLC python 
> bindings) with the difference I use Qt5.5 with python 2.7 on Mac OS 
> Yoshmite.
*Thanks for the reply. I wasn't sure exactly what problems the GIL could 
cause, but I saw enough people complaining about changes from PyQt4 to 
PyQt5 to think that it might be an issue. I've been able to "fix" some 
of the issues I was seeing by altering the focus policy on the tree 
widget used to trigger video playback.*

*However, why the cursor icon doesn't change when moved over a splitter 
handle is a real mystery. It does change for another splitter in another 
part of my program, but for the splitter which contains the video player 
(whether based on VLC bindings or QMultimedia), it doesn't. Even if I 
place the video player inside another widget before placing it into the 
splitter I still see this problem. It appears to be a bug related to 
accessing the winId() of the widget 
[**https://bugreports.qt.io/browse/QTBUG-33479 
<https://bugreports.qt.io/browse/QTBUG-33479>**] or the video playback 
itself...

Best regards,
Timothy Grove
*
>
> I can resize my tab widgets using a vertical splitter while playing a 
> movie.  HOWEVER I did on Fedora 20 KDE Linux come across such an issue 
> (among others) when using QtMultimedia combined with QWebEngine in the 
> same app...... which was for me the reason to stay with VLC python 
> bindings.
>
>
> Best regards,
> Rembrand
>
> Today's Topics:
>
>    1. segfault creating an empty QGraphicsScene (Russell Warren)
>    2. Re: Implementation of the QQuickFramebufferObject (Phil Thompson)
> *3. porting PyQt4 to PyQt5 on OSX - cursor icon not changing over**
> **      QSplitter (Timothy Grove)*
>    4. Bug in qpycore_PyObject_AsQString (Kovid Goyal)
> ------------------------------
>
> *Message: 3*
> Date: Sat, 19 Sep 2015 09:23:16 +0100
> From: Timothy Grove <tim_grove at sil.org>
> To: PyQT mailing list <PyQt at riverbankcomputing.com>
> Subject: [PyQt] porting PyQt4 to PyQt5 on OSX - cursor icon not
> changing over QSplitter
> Message-ID:
> <CAJbHV24+sTT1iL3-B6-oiuY40CiaURh6-Rpxq+Z6smABOgALWQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> I'm porting an application from PyQt4 to PyQt5 on Mac OSX (Mavericks).
> Generally a good experience, but I'm seeing a few strange behaviours 
> that I
> haven't been able to work around; possibly due to accessing the window id
> of the widget in my video player, or possibly a GIL release issue?
>
> *1. The cursor doesn't change when moved over a splitter handle. *This
> "might" be related to a "closed' issue where a widget's window id was
> accessed with the widget in a QSplitter [
> https://bugreports.qt.io/browse/QTBUG-33479], but might it also be related
> to not releasing the GIL? I'm using the python bindings for VLC [
> https://wiki.videolan.org/Python_bindings] which uses the window id to 
> make
> the link between VLC and a widget for video display; in my case, a QLabel.
> I've also tried replacing VLC use with QVideoWidget from
> PyQt5.QtMultimediaWidgets, but with similar results. Before a video is
> loaded I can see the expected change in cursor icon over the splitter
> handle, but once a video has loaded - no change.
>
> Using Macports Mavericks (10.9.5):
> python3.4 @3.4.3_5
> qt5-mac @5.4.2_1
> py34-sip @4.16.9_0
> py34-pyqt5 @5.5_0
>
> Best regards,
> Timothy Grove

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