Multiple styles using pyqgis

Question

I'm trying to automate adding styles to layers, with each layer having multiple styles using pyqgis.

Couldn't find any answers except this unanswered question:

Adding multiple styles to single layer with pyQGIS?

I did manage to add multiple styles using QgsMapLayerStyleManager:

layer = iface.activeLayer()
layer.name()
mlsm = QgsMapLayerStyleManager(layer)
layer.loadNamedStyle('~/Styles/BasinAnalysis/Area/Total.qml')
mlsm.renameStyle("default","Area-Total")
mlsm.addStyleFromLayer("Area-Freshwater")
layer.loadNamedStyle('~/Styles/BasinAnalysis/Area/Freshwater.qml')
mlsm.addStyleFromLayer("Area-Unirrigated")
layer.loadNamedStyle('~/Styles/BasinAnalysis/Area/Unirrigated.qml')
etc...

It seems like the multiple styles are associated to layer, and I can also see the changes applies to layer:

mlsm.styles()
>>> ['Area-Freshwater', 'Area-Other', 'Area-Saline', 'Area-TWW', 'Area-Total', 'Area-Unirrigated']

The problem is that styles don't appear when I right click on Layer -> Styles, it only shows the default layer.

I'm guessing I need to associate the styles from the StyleManager back to the layer, but not sure how.

Answer 1

You should obtain the style manager from layer instead of creating new one. You can do this with:

layer.styleManager()

You can read more in QGIS documentation: https://qgis.org/api/classQgsMapLayer.html#ac7ce04c009ac81926b63af4c98bd5c72