In QGIS 3.4, I would like to automatize and uniformize the appearance of each layer.
I would like that each new layer is created:
- with the alpha slider activated
- with Feature count activated
Add a comment
|
1 Answer
You could use something like the following in the Python Console which:
- Enables the feature count setting for vector-type layers
- Enables the transparency slider for any layer
These are applied whenever a layer is added:
def enableFeatCountAndAlphaSlider(layers):
root = QgsProject.instance().layerTreeRoot()
layer = layers[0]
# Enable feature count for vector-type layers
if layer.type() == QgsMapLayer.VectorLayer:
myLayerNode = root.findLayer(layer.id())
myLayerNode.setCustomProperty("showFeatureCount", True)
# Enable transparency slider
if layer.customProperty("embeddedWidgets/count") != 1 or layer.customProperty("embeddedWidgets/0/id") != u'transparency':
layer.setCustomProperty("embeddedWidgets/count", 1)
layer.setCustomProperty("embeddedWidgets/0/id", "transparency")
# Refresh legend symbology
iface.layerTreeView().refreshLayerSymbology(layer.id())
# Connect "legendLayersAdded" event to "enableFeatCountAndAlphaSlider" function
QgsProject.instance().legendLayersAdded.connect(enableFeatCountAndAlphaSlider)
To disconnect the function, use:
QgsProject.instance().legendLayersAdded.disconnect(enableFeatCountAndAlphaSlider)
-
1Works directly for me. Thanks a lot for your detailed answer ! I am just beginning with pyScript, it helped a lot.– kFlyJul 26, 2019 at 17:04
-
What do you use to create the animated picture you add in your answer ?– kFlyJul 26, 2019 at 17:07
-
1
-
1@kFly - You don't run the function manually, you connect it to a signal which is emitted whenever a layer is added to QGIS which is what this line does:
QgsProject.instance().legendLayersAdded.connect(enableFeatCountAndAlphaSlider)– JosephAug 1, 2019 at 14:59 -
1@kFly - I tested the script as a startup. I had to include the lines
from qgis.core import QgsMapLayer, QgsProjectandfrom qgis.utils import ifaceat the beginning. After QGIS has loaded, it works. Did you put it in the same directory called "Python" or did you put it inside this directory? I'm not a linux user so not sure if this is the correct path or not. If it is correct then perhaps the issue lies elsewhere.– JosephAug 2, 2019 at 9:10