Animating SVG widget

SPlatten

I have instances of QSvgWidget which create from a resource in my application:

psvgRxIcon = new QSvgWidget(":/SVG_LED");
psvgRxIcon->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
psvgRxIcon->setFixedSize(24, 24);

I'm investigating the best way to animate and thanks to suggestions from @mrjj, I've added:

pdocRxIcon = new QDomDocument();
pfileRxIcon = new QFile(":/SVG_LED");
pfileRxIcon->open(QIODevice::ReadOnly | QIODevice::Text);
pdocRxIcon->setContent(pfileRxIcon);

I've found the element I want to change, changed it and put it back in the attribute, the question is do I then have to re-create the widget every-time I change the document? Is there another way?

There are no methods that return pointers or references in the document so its a bit of a pain to modify and put back. I have use setAttribute to put back the modified attribute back into the element.

SPlatten

Done it, and it works, in the SVG resource I set the opacity to 0, then in this modification I change the opacity to 1:

    double dblOpacity = 1.0;
 
    QDomElement elRoot(mpdocRxIcon->firstChildElement());
    QDomNodeList lstNodes(elRoot.elementsByTagName(TraineeMonitor::mscszTagStop));
    bool blnAssign(false);
    for( int i=0; i<lstNodes.size(); i++ )
    {
        QDomNode ndStop(lstNodes.at(i));
        if ( !ndStop.isElement() )
        {
            continue;
        }
        QDomElement elm(ndStop.toElement());
        QString strID(elm.attribute(TraineeMonitor::mscszAttrID));
        if ( strID.compare(TraineeMonitor::mscszLEDcolor) == 0 )
        {
            QString strStyle(elm.attribute(TraineeMonitor::mscszAttrStyle));
            QStringList slstStyles(strStyle.split(TraineeMonitor::mscszStyleDelimiter));
            uint uintIdx = 0;
            foreach( QString strStyle, slstStyles )
            {
                QStringList slstStyle(strStyle.split(TraineeMonitor::mscszAttrDelimiter));
                strStyle = slstStyle[0];
                if ( strStyle.compare(TraineeMonitor::mscszStyleStopOpacity) == 0 )
                {
                    slstStyles[uintIdx] = strStyle +
                                          TraineeMonitor::mscszAttrDelimiter +
                                          QString::number(dblOpacity);
                    blnAssign = true;
                    break;
                }
                uintIdx++;
            }
            if ( blnAssign == true )
            {
                QString strNewStyle;
                foreach( QString strStyle, slstStyles )
                {
                    if ( strNewStyle.isEmpty() != true )
                    {
                        strNewStyle += TraineeMonitor::mscszStyleDelimiter;
                    }
                    strNewStyle += strStyle;
                }
                elm.setAttribute(TraineeMonitor::mscszAttrStyle, strNewStyle);
                break;
            }
        }
    }
    if ( blnAssign == true )
    {
        mpsvgRxIcon->load(mpdocRxIcon->toByteArray());
    }

The final version will have a QTimer that increments the sets the opacity to 1 then decrements to 0 to fade out.