[QGIS-Developer] Catch qgis exit

Mon Jun 29 01:48:19 PDT 2020

Thank you very much. That works perfectly and I think that they will
usually use the X button.

Jan Růžička, Ph.D.
freelancer, researcher and volontaire
Geoinformatics
tel: +420 775 032 091
e-mail: jan.ruzicka.vsb at gmail.com <http://jan.ruzicka.vsb.cz/>
http://github.com/ruz76/
http://gismentors.eu/
http://dolnilhota.info/

Le lun. 29 juin 2020 à 07:04, Nyall Dawson <nyall.dawson at gmail.com> a
écrit :

> On Mon, 29 Jun 2020 at 14:39, Jan Růžička <jan.ruzicka.vsb at gmail.com>
> wrote:
> >
> > Thank you. As you wrote, the problem is that this works only for the
> Widged of the plugin. There is not a way to override the closeEvent()
> method of the main QGIS Window from the plugin, since the plugin has only
> an interface given by the QGIS.
> >
> > I have decided to use the workaround for now, so when the QGIS is closed
> it will start again. The solution is not so perfect, but at least it is a
> solution.
> >
> > Another way to do this is to rewrite C++ code. The code is not so
> complicated and I can rewrite it, but then I have to build QGIS for all
> police stations and keep it updated and it is not so simple for me.
>
> Not sure how to intercept the quit action cleanly, but you can
> intercept the "X" button click:
>
> class NoClose(QObject):
>
>     def __init__(self, parent=None):
>         super().__init__(parent)
>
>     def ok_to_close(self):
>         return False
>
>     def eventFilter(self, object, event):
>         if isinstance(event, QCloseEvent):
>             if not self.ok_to_close():
>                 event.ignore()
>                 return True
>
>         return super().eventFilter( object, event )
>
> no_close = NoClose()
> iface.mainWindow().installEventFilter(no_close)
>
>
>
>
> >
> > Thank you again
> >
> > Jan Růžička, Ph.D.
> > freelancer, researcher and volontaire
> > Geoinformatics
> > tel: +420 775 032 091
> > e-mail: jan.ruzicka.vsb at gmail.com
> > http://github.com/ruz76/
> > http://gismentors.eu/
> > http://dolnilhota.info/
> >
> >
> > Le ven. 26 juin 2020 à 09:09, Ujaval Gandhi <ujaval at spatialthoughts.com>
> a écrit :
> >>
> >> The way to achieve this would be to override the closeEvent() method of
> the main QGIs Window. I don't know how to do that. But you can do that on
> your plugin widget - which will at least prevent that dialog to be closed
> if certain conditions are not met.
> >>
> >>     def closeEvent(self, event):
> >>       if condition:
> >>         event.accept()
> >>       else:
> >>         event.ignore()
> >> Ujaval Gandhi
> >> Spatial Thoughts
> >> mobile: +91-8095684687
> >> email: ujaval at spatialthoughts.com
> >>
> >> Subscribe to our newsletter http://bit.ly/spatialthoughts-newsletter
> >>
> >>
> >>
> >> On Fri, Jun 26, 2020 at 10:02 AM Jan Růžička <jan.ruzicka.vsb at gmail.com>
> wrote:
> >>>
> >>> Thank you very much, the same is possible in the unload method of the
> plugin, but the question is how to stop QGIS to exit.
> >>> I need to inform the user that he did not enter the result of the
> search and keep QGIS open for the user to enter the result.
> >>>
> >>> The possible workaround may be, to run the QGIS again, when it quits,
> but I thought that there may be some better way.
> >>>
> >>> Jan Růžička, Ph.D.
> >>> freelancer, researcher and volontaire
> >>> Geoinformatics
> >>> tel: +420 775 032 091
> >>> e-mail: jan.ruzicka.vsb at gmail.com
> >>> http://github.com/ruz76/
> >>> http://gismentors.eu/
> >>> http://dolnilhota.info/
> >>>
> >>>
> >>> Le jeu. 25 juin 2020 à 17:25, Ujaval Gandhi <
> ujaval at spatialthoughts.com> a écrit :
> >>>>
> >>>> I saw that there is a aboutToQuit signal emitted just before a
> QApplication exists. The following works from QGIS Python Console.
> >>>>
> >>>> def test():
> >>>>     with open('/tmp/test.txt', 'w') as f:
> >>>>         f.write('wrote while exiting')
> >>>>
> >>>> qApp.aboutToQuit.connect(test)
> >>>> Ujaval Gandhi
> >>>> Spatial Thoughts
> >>>> mobile: +91-8095684687
> >>>> email: ujaval at spatialthoughts.com
> >>>>
> >>>> Subscribe to our newsletter http://bit.ly/spatialthoughts-newsletter
> >>>>
> >>>>
> >>>>
> >>>> On Thu, Jun 25, 2020 at 5:00 PM Jan Růžička <
> jan.ruzicka.vsb at gmail.com> wrote:
> >>>>>
> >>>>> Dear developers,
> >>>>>
> >>>>> I have developed a plugin for the Police of the Czech Republic for
> Search and Rescue operations. It works quite well, but one important
> feature is missing.
> >>>>>
> >>>>> After the search event is finished the user should enter the result
> of the search.
> >>>>>
> >>>>> I was not able to find a way to catch an event when the user closes
> the whole QGIS. I need similar functionality like when closing in the case
> of a dirty project (no all changes were saved).
> >>>>>
> >>>>> I have searched a lot and did not find any solution. I was able to
> catch the unload event of the plugin, but I did not find a way to keep QGIS
> opened.
> >>>>>
> >>>>> Any help appreciated
> >>>>> Jan Růžička, Ph.D.
> >>>>> freelancer, researcher and volontaire
> >>>>> Geoinformatics
> >>>>> tel: +420 775 032 091
> >>>>> e-mail: jan.ruzicka.vsb at gmail.com
> >>>>> http://github.com/ruz76/
> >>>>> http://gismentors.eu/
> >>>>> http://dolnilhota.info/
> >>>>> _______________________________________________
> >>>>> QGIS-Developer mailing list
> >>>>> QGIS-Developer at lists.osgeo.org
> >>>>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
> >>>>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
> >
> > _______________________________________________
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