qgis plugins - Determining if a group in legend is selected, using PyQGIS

How can I determine in code (python or c++) whether a group in legend is selected or not?

mQGisIface->legendInterface()->selectedLayers() 

gives me only selected layers and no groups, and in QgsLegendInterface I doesn't find anything about it.

I use QGIS Version 2.14.4.

Answer

You can use QgsLayerTreeView (accessible from the iface object) for that. I didn't find a direct way (QgsLayerTreeGroup doesn't seem to have a method for that), but you can simply reuse the following function:

def isMyGroupSelected( groupName ):
    myGroup = QgsProject.instance().layerTreeRoot().findGroup( groupName )        
    return myGroup in iface.layerTreeView().selectedNodes()

print isMyGroupSelected( 'my group name' )

Note that iface.layerTreeView().selectedNodes() gives you a list of selected nodes in the legend, which you could use directly, depending on your use case (e.g., print names of selected groups).

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EDIT: For reference, this is the C++ code that you told me you ended up using:

QList selNodes= mQGisIface->layerTreeView()->selectedNodes(true);
for (int i=0;i    QgsLayerTreeNode * selNode=selNodes.at(i);       
    if(selNode->nodeType==QgsLayerTreeNode::NodeType::NodeGr‌​oup) {
        ...