[Qgis-user] show labels only, if objects are activated/visible

[Andreas Neumann]

Hi Bernhard,

Yes - we "sort of" have "rule based" labeling with the data-defined 
properties and conditions. But for very complex labeling it is a bit 
hard to track. The rules are so distributed in different 
places/properties that it is hard to get an overview what is really 
going on.

I mean the UI of the rule-based symbology is nicer and allows to change 
multiple graphical properties of the same rule at once.

There is certainly room for improvements.

A coupling of rendering and labeling would be quite interesting (esp. 
for the case Otto is mentioning where users want to selectively 
enable/disable rules/categories), I think - but I don't know if it is 
technically solvable (or how hard it is).

Andreas

On 30.04.2015 10:37, Bernhard Ströbl wrote:
> Hi Andreas,
>
> don't we have rule-based labelling?
> CASE WHEN <condition> THEN 'bla' ELSE 'blub' END
>
> Problem is that you may have to rewrite all the rules that you already 
> have written in the rule-based style.
>
> Bernhard
>
> Am 30.04.2015 10:21, schrieb Andreas Neumann:
>> Hi Otto,
>>
>> I don't think that this is possible. As far as I know the labeling is
>> totally disconnected from the symbology. Only global filters on the
>> whole layer (the filter in the general tab in the layer properties) is
>> honored by both labeling and the rest of the symbology. The rest is
>> totally disconnected.
>>
>> I can see value in what you want, but I doubt it is easily possible.
>>
>> It would also help if we would have rule based labeling, so we could at
>> least apply similar rules to the labels as we apply to the symbology of
>> features.
>>
>> Larry probably knows more about that.
>>
>> Andreas
>>
>> On 30.04.2015 09:44, Otto Dassau wrote:
>>> Hi,
>>>
>>> is it possible to show labels only, if the objects are 
>>> activated/visible?
>>>
>>> I use the rule based renderer with two nested rules, both categorized
>>> rendering, like:
>>>
>>> Cat 1
>>> #####
>>>
>>> Road 1
>>>           Cat 2
>>>           ######
>>>
>>>        |_ Lukas
>>>        |_ Frank
>>>        |_ Markus
>>>        |_ Georg
>>>
>>> Road 2
>>>
>>>        |_ John
>>>        |_ Leo
>>>        |_ Herbert
>>>
>>>
>>> If I deactivate labeling for some values in the first categorized
>>> rendering (Cat 1), objects and labels are invisible. But if I 
>>> deactivate
>>> labeling for some values in the second categorized rendering (Cat 2),
>>> objects are invisible but labels are still shown.
>>>
>>> Is there a way how to solve this in the rule based renderer?
>>>
>>> Thanks a lot
>>> Otto
>>>
>
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