I'm writing a Python script to load a "qml" style file. The following
two lines work correctly:
lyr1 = iface.activeLayer()
lyr1.loadNamedStyle('xxx.qml')
but the following two lines cause an error message:
lyr2 = instance.parameterAsSource(parameters, "INPUT", context)
lyr2.loadNamedStyle('xxx.qml')
AttributeError: QgsProcessingFeatureSource: object has no attribute
'loadNamedStyle'
My problem is that
lyr1 is a QgsVectorLayer but lyr2 is a
QgsProcessingFeatureSource
So the issue comes down to how to load a named style file onto a
QgsProcessingFeatureSource. The complete code is below. Thanks for
any advice. Steve
==
from qgis import processing
from qgis.processing import alg
from qgis.core import QgsProject
from qgis.utils import iface
@alg(name='getMyStyle', label='load BigPicStyle on the active layer (alg)',
group='examplescripts', group_label='Example scripts')
@alg.input(type=alg.SOURCE, name='INPUT', label='Input vector layer')
@alg.input(type=alg.STRING, name='theStyle', label='name of style file')
@alg.output(type=alg.STRING, name='OUTPUT', label='output lbl')
def getMyStyle(instance, parameters, context, feedback, inputs):
"""
Asks for a style name and then loads that style. By default,
the layer acted on is the active layer, but a dropdown
menu lets user choose another layer.
"""
stylePath = 'C:/Promenade/GIS/data/styles/'
whichFile = parameters.get('theStyle')
# note: lyr1 is QgsVectorLayer; lyr2 is QgsProcessingFeatureSource
lyr1 = iface.activeLayer()
lyr2 = instance.parameterAsSource(parameters, "INPUT", context)
lyr1.loadNamedStyle(stylePath + whichFile + '.qml') #this works
lyr1.triggerRepaint()
#next line causes AttributeError:
# 'QgsProcessingFeatureSource' object has no attribute 'loadNamedStyle'
lyr2.loadNamedStyle(stylePath + whichFile + '.qml')
lyr2.triggerRepaint()
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
