[Qgis-developer] QGIS Server : layer ordre from group

[René-Luc Dhont]

Hi Andreas and devs,

My fixe does not affect the layer order fixed by the WMS LAYERS parameters.

For exemple QGIS Web Client manage the layer order by building the WMS 
LAYERS parameters with all the layers and without groups. QGSI Web 
Client is not concerned by this fixe.

In Lizmap, user can specify Group as layer, which means that the group 
name is used in the WMS LAYERS parameter. We used it to reduce the 
number of names in the WMS LAYERS parameter, to have 3 rendering based 
on  scale in one web client layer, to have based layer, etc. It is not a 
so old issue, probably introduce with the new layer tree.

I just fix it because the rendering was not in the same order as in the 
Desktop QGIS.

René-Luc


Le 15/09/2015 17:14, Andreas Neumann a écrit :
> Hi René-Luc,
>
> Thank you for the patch and the notice - do you know since when this 
> bug was present. Probably since ages?
>
> This change will basically mean that all QGIS Web Client users will 
> have to patch their client at the same time they upgrade their server.
>
> I am not against this change - I am just thinking about the 
> consequences. I think we reversed rendering order on the client. If we 
> don't communicate this properly - a lot of QGIS server/client users 
> will run into this issue and will complain.
>
> Andreas
>
> On 15.09.2015 16:50, René-Luc Dhont wrote:
>> Hi devs and QGIS Server user,
>>
>> I just fixed an issue in QGIS server and backport it to release-2_10 
>> and release-2_8.
>> https://github.com/qgis/QGIS/commit/8948721991bf321fb7eb2da259790624183f619d 
>>
>> https://github.com/qgis/QGIS/commit/ae906b5eca9f99d7e4bd4e29e3b1bc4b49122be2 
>>
>> https://github.com/qgis/QGIS/commit/977d17751b9c05da1f09ed40d1cf27a97db5f534 
>>
>>
>> If custom order is not enabled and a group is requested, layers was 
>> added in the DOM element order. The default rendering order is the 
>> reverse. To fix this issue, QgsWMSProjectParser::addLayersFromGroup 
>> has to read group element children from end (bottom) to start (top).
>>
>> If you use QGIS server, I invite you to update your build.
>>
>> Regards,
>> René-Luc
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