I wrote this code 5 years ago because I wanted any layer added to the layer
panel to be on top not the bottom.
def add_layer_to_map(self, layer: QgsMapLayer):
"""Add layer to top of layer window because QGIS
always puts at the bottom in layer order panel.
Args:
layer (QgsMapLayer): Base class for all map layer types.
"""
QgsProject.instance().addMapLayer(layer)
root = QgsProject.instance().layerTreeRoot()
root.setHasCustomLayerOrder(True)
order = root.customLayerOrder()
order.insert(0, order.pop(order.index(layer)))
root.setCustomLayerOrder(order)
layer.triggerRepaint()
root.setHasCustomLayerOrder(False)
From: QGIS-Developer <[email protected]> On Behalf Of
coder via QGIS-Developer
Sent: Wednesday, October 23, 2024 11:05 AM
To: [email protected]
Subject: [QGIS-Developer] How to turn on CustomLayerOrder (PyQGIS)
Hello
I'm trying to change the rendering order for the layers in the canvas with the
aid of QgsLayerTree. The code grabs each layer, checks whether is a QgsMapLayer
instance, and generates a reordered list (layersII). Then, the code executes:
QgsLayerTree().setCustomLayerOrder(layersII)
but nothing happens and
print (QgsLayerTree().hasCustomLayerOrder())
returns False. The API documentation
(Blockedhttps://qgis.org/pyqgis/master/core/QgsLayerTree.htmlBlocked) indicates
that customLayerOrder will only be used when hasCustomLayerOrder is True. I'm
missing something here but after browsing and googling, I just haven't figured
out how to make the change in rendering order active. Thanks.
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