[Qgis-developer] Reliable way to determine a groupIndex in the legend tree

[Andreas Neumann]

Hi,

Thank you Bernhard. This works better than my code with the
legend.groupLayerRelationship()

We should add this to the Python Cookbook
(http://www.qgis.org/en/docs/pyqgis_developer_cookbook/) - Do you mind?
Or should I do a pull request?

Do you have a clever strategy to make this same code available in
multiple QGIS plugins?

But really this should go into the core QGIS API. It is annoying taking
care of such things.

Andreas

Am 08.10.2013 13:32, schrieb Bernhard Ströbl:
> Hi Andreas,
> 
> this is how I do it:
> 
> def getGroupIndex(self,  groupName):
>     '''Find the index for group groupName'''
>     retValue = -1
>     groups = self.iface.legendInterface().groups()
> 
>     for i in range(len(groups)):
>         if groups[i] == groupName:
>             retValue = i
>             break
> 
>     return retValue
> 
> def moveToGroup(self, layer, groupName):
>     '''move layer into a group'''
> 
>     grpIdx = self.getGroupIndex(groupName)
> 
>     if grpIdx == -1:
>        # add the group
>        grpIdx = self.iface.legendInterface().addGroup(groupName)
> 
>     self.iface.legendInterface().moveLayer(layer,  grpIdx)
> 
> Bernhard
> 
> Am 08.10.2013 15:17, schrieb Andreas Neumann:
>> Hi,
>>
>> In my python script I would like to append a filtered Postgis layer into
>> a group with a given name.
>>
>> This works fine as long as the user did not activate a group already
>> interactively. If a group is already active, my method to find the
>> groupIndex fails. If not group is active, the script works fine.
>>
>> Here is my method:
>>
>> ---------------
>> #read the legend tree to find the index of the group defined in groupName
>> groups = []
>> for group in self.legend.groupLayerRelationship():
>> groups.append(group[0])
>> groupIndex = groups.index(groupName)
>> if QGis.QGIS_VERSION[0:3] >= "1.9":
>> groupIndex -= 1
>>
>> #move new layer to existing group
>> self.legend.moveLayer(schulkreisLayer, groupIndex)
>> --------------
>>
>> Is there a more reliable way to find the groupIndex if the user selected
>> a group already?
>>
>> Maybe there is some interference with the setting "New layers should be
>> added to chosen or current group" setting in "Settings" --> "Options"
>> --> "Map & Legend" --> "Layerlegend"?
>>
>> Thanks,
>> Andreas
>> _______________________________________________
>> Qgis-developer mailing list
>> Qgis-developer at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>>
>>
> 
> 
> 
> __________ Information from ESET Mail Security, version of virus
> signature database 8890 (20131008) __________
> 
> The message was checked by ESET Mail Security.
> http://www.eset.com
> 
> 
> _______________________________________________
> Qgis-developer mailing list
> Qgis-developer at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-developer