How to move a layer in QGIS Toc above an existing group?

Question

If in QGIS TOC a group already exists and I add a new layer via

QgsVectorLayer* lyr= mQGisIface->addVectorLayer(uri->uri(),Title, myProviderName);

the new layer will be inserted within the group. How can I move it outside/above the group?

Answer 1

You can do that by following these steps (QGIS >= v.2.4):

1. Get the layer tree object

   root = QgsProject.instance().layerTreeRoot()
   

2. Find the desired group by name

   mygroup = root.findGroup("group1")
   

3. Get the group index

   parentGroup = mygroup.parent()
   groupIndex=-1
   for child in parentGroup.children():
        groupIndex+=1
        if mygroup == child:
            break
   

4. Create the new layer object

   mylayer = QgsVectorLayer("/PathToYour/data.shp", "my layer", "ogr")
   

5. Add the layer to the QGIS Map Layer Registry

   QgsMapLayerRegistry.instance().addMapLayer(mylayer, False)
   

6. Insert the layer above the group

   parentGroup.insertChildNode(groupIndex, QgsLayerTreeLayer(mylayer))