Hi guys Thank you all for your suggestions. Calls to print() triggering QCoreAppliation::processEvents() explains the phenomena and I was able to fix using the Boundless's QNetworkAccessManager wrapper instead of the requests library.
Thanks again! Peter On 6 October 2017 at 07:41, Richard Duivenvoorde <rdmaili...@duif.net> wrote: > > > And to make things easier, use > > https://github.com/boundlessgeo/lib-qgis-commons/blob/master/qgiscommons2/network/networkaccessmanager.py > > which should be core class in QGIS if you ask me. So we can get rid of > all other different blocking/nonproxying etc ways to connect QGIS to http... > > Regards, > > Richard Duivenvoorde > > On 05-10-17 22:01, Ricardo Filipe Soares Garcia da wrote: > > Hi Peter > > > > In addition to Matthias' advice perhaps try using > > QNetworkAccessManager[1] and related classes in order to deal with your > > http requests asynchronously. This should fix the UI blocking issues. > > > > Best regards > > > > > > [1] > > - http://pyqt.sourceforge.net/Docs/PyQt4/qnetworkaccessmanager.html#details > > > > > > Em 05/10/2017 15:18, "Matthias Kuhn" <matth...@opengis.ch > > <mailto:matth...@opengis.ch>> escreveu: > > > > Hi Peter, > > > > Have a look at this answer here, which explains how you can trigger > > the same behavior without using the print and relying on > > side-effects of the console open. > > > > It also outlines the risks involved in using this kind of approach. > > > > https://gis.stackexchange.com/a/257016 > > <https://gis.stackexchange.com/a/257016> > > > > Cheers > > Matthias > > > > > > On 10/05/2017 03:25 PM, Peter Devoy wrote: > > > > Just a little update; it is the fact I am using print() to output > > debug information upon each request which is allowing the UI to > > repaint. Also, it seems that opening and closing the Python console > > once is enough. > > > > Peter > > > > 3XE > > P: 01326 567155 > > M: 07770 693662 > > A: 3XE Ltd > > Tremough Innovation Centre > > PENRYN > > TR10 9TA > > 3XE Ltd · Registered in England and Wales · 9356871 > > > > > > On 4 October 2017 at 20:53, Peter Devoy <pe...@3xe.co.uk > > <mailto:pe...@3xe.co.uk>> wrote: > > > > Hi all > > > > In my plugin I have extended QAbstractListModel to create a > > list of > > objects; each object in the list has a 'url' property > > containing the > > URL of an API resource. When the user selects a feature in > > main QGIS > > interface, each object in the list makes a HTTP request to > > its URL and > > updates its properties from the response data. > > > > Changes in the objects' properties are reflected in a > > QListView. E.g. > > a property 'status' is set to 'WARN' if the HTTP request > > fails -- > > this is reflected in the QListView by the respective list > > item's icon > > turning yellow. > > > > If I have the Python console open in QGIS the QListView > > items update > > as the ListModel's objects update. However, if the Python > > console is > > not open, the plugin's UI thread appears to be blocked until > > each item > > in the list has completed its changes and all the items > > update at > > once; please can anyone recommend a way to avoid this? > > > > I have been developing on QGIS 2.1X. > > > > Kind regards > > > > > > Peter > > > > _______________________________________________ > > QGIS-Developer mailing list > > QGIS-Developer@lists.osgeo.org > > <mailto:QGIS-Developer@lists.osgeo.org> > > List info: > > https://lists.osgeo.org/mailman/listinfo/qgis-developer > > <https://lists.osgeo.org/mailman/listinfo/qgis-developer> > > Unsubscribe: > > https://lists.osgeo.org/mailman/listinfo/qgis-developer > > <https://lists.osgeo.org/mailman/listinfo/qgis-developer> > > > > > > _______________________________________________ > > QGIS-Developer mailing list > > QGIS-Developer@lists.osgeo.org <mailto:QGIS-Developer@lists.osgeo.org> > > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > <https://lists.osgeo.org/mailman/listinfo/qgis-developer> > > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > <https://lists.osgeo.org/mailman/listinfo/qgis-developer> > > > > > > > > > > _______________________________________________ > > QGIS-Developer mailing list > > QGIS-Developer@lists.osgeo.org > > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > > > _______________________________________________ > QGIS-Developer mailing list > QGIS-Developer@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer _______________________________________________ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer