Feature request #10764
Python API to handle layer groups without iface
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Normal | ||
| Assignee: | - | ||
| Category: | - | ||
| Pull Request or Patch supplied: | No | Resolution: | fixed/implemented |
| Easy fix?: | No | Copied to github as #: | 19147 |
Description
My intent is to automate production of raster files to use QgisMapServer as a WMS Server.
In order to manage it, I use a stand-alone python script (without GUI) to handle QGS project files. See attached file modifyqgs.py.
Up to now, I am able to add raster layers to an existing project using QgsMapLayerRegistry.
Now, I want to organize layers using groups but I didn't find any API to acheive it using "headless" API - that is without qgis.utils.iface.legendInterface() component. Still undocumented QgsLayerTreeGroup used by QgsProject may be a future solution?
Regards.
modifyqgs.py 
(1.75 KB)
History
#1
Updated by Martin Dobias over 10 years ago
- Resolution set to fixed/implemented
- Status changed from Open to Closed
The QgsLayerTree* classes are exactly what you are looking for. Please see the doxygen documentation of the classes (especially QgsLayerTreeNode, QgsLayerTreeLayer, QgsLayerTreeGroup). I will add some more documentation to PyQGIS cookbook later. For now, your entry point is QgsProject.instance().layerTreeRoot() - from there you can start adding child groups and layers.
#2
Updated by David AMAR over 10 years ago
Thank you Martin.
I have just tried these classes and I think there are some points to fix if you confirm them:
- QgsLayerTreeNode, QgsLayerTreeLayer, QgsLayerTreeGroup documentation is not generated by doxygen in official documentation http://qgis.org/api/2.4.
- When I try 'print QgsProject.instance().layerTreeRoot().dump()' in a stand-alone python script, I only see GROUP nodes. Same command in Python Console in QGIS Desktop displays GROUP and LAYER nodes.
Ex:
Results in stand-alone script
---
GROUP: visible=2 expanded=1
GROUP: myGroup visible=2 expanded=1
---
Results in Python Console
---
GROUP: visible=2 expanded=1
GROUP: myGroup visible=2 expanded=1
LAYER: myRaster visible=2 expanded=1 id=myRaster20140702045512566
---
Best Regards.