Updating Layer tree after changing symbology with PyQGIS

Question

When I change symbology for a given QgsVectorLayer (QGIS 2.14.16 LTR) by

r=iface.activeLayer().rendererV2()
r.symbol().symbolLayers()[0].setColor(0,0,255,255)

as shown here:

and refreshing the map content by

iface.mapCanvas().refreshAllLayers()

I get the expected result, but the Layer Tree does not update as shown here:

What am I missing, and how can I update the Layer tree from PyQGIS programmatically?

Germán Carrillo · Accepted Answer · 2017-07-21 11:59:29Z

6

Tell the layer tree view to refresh your layer's symbology:

iface.layerTreeView().refreshLayerSymbology( iface.activeLayer().id() )

answered Jul 21, 2017 at 11:59

Germán Carrillo

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iface.legendInterface().refreshLayerSymbology(lay) where lay is the QgsMapLayer object which symbology changed.
– Andreas Müller
Commented Jul 21, 2017 at 14:54
@AndreasMüller According to the docs, you need to pass the layer id, not the layer object.
– Germán Carrillo
Commented Jul 21, 2017 at 15:03
qgis.org/api/2.14/… it's the layer object if using legendInterface, not very consistent...
– Andreas Müller
Commented Jul 21, 2017 at 15:28
Ah! But remember that legendInterface is legacy code. Layer tree classes are always recommended.
– Germán Carrillo
Commented Jul 21, 2017 at 15:34
2

For instance, legendInterface won't be available in QGIS 3.0: github.com/qgis/QGIS/blob/master/doc/api_break.dox#L277
– Germán Carrillo
Commented Jul 24, 2017 at 23:45

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