static bool _readOldLegendLayerOrderGroup( const QDomElement& groupElem, QMap<int, QString>& layerIndexes )
{
QDomNodeList legendChildren = groupElem.childNodes();
for ( int i = 0; i < legendChildren.size(); ++i )
{
QDomElement currentChildElem = legendChildren.at( i ).toElement();
if ( currentChildElem.tagName() == "legendlayer" )
{
QDomElement layerFileElem = currentChildElem.firstChildElement( "filegroup" ).firstChildElement( "legendlayerfile" );
int layerIndex = currentChildElem.attribute( "drawingOrder" ).toInt();
if ( layerIndex == -1 )
return false; // order undefined
layerIndexes.insert( layerIndex, layerFileElem.attribute( "layerid" ) );
}
else if ( currentChildElem.tagName() == "legendgroup" )
{
if ( !_readOldLegendLayerOrderGroup( currentChildElem, layerIndexes ) )
return false;
}
}
return true;
}
bool QgsLayerTreeUtils::readOldLegendLayerOrder( const QDomElement &legendElem, bool &hasCustomOrder, QStringList &order )
{
if ( legendElem.isNull() )
return false;
hasCustomOrder = legendElem.attribute( QStringLiteral( "updateDrawingOrder" ) ) == QLatin1String( "false" );
order.clear();
QMap<int, QString> layerIndexes;
// try to read the order. may be undefined (order = -1) for some or all items
bool res = _readOldLegendLayerOrderGroup( legendElem, layerIndexes );
if ( !res && hasCustomOrder )
return false; // invalid state
const auto constLayerIndexes = layerIndexes;
for ( const QString &layerId : constLayerIndexes )
{
QgsDebugMsg( layerId );
order.append( layerId );
}
return true;
}
