[QGIS-Developer] Qt Model-View updates blocked when Python console not open

[Ricardo Filipe Soares Garcia da]

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" <matthias at 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

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
>
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>
> On 4 October 2017 at 20:53, Peter Devoy <peter at 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
>>
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