layer plugin improve - show each rule of the layer with its symbology

[patricev]

Hi community,

I'm sending you a ticket to provide you with user feedback that I may have received regarding the layer management plugin. They expect to have a more faster interaction with the layers and the associated legend.

Summarizing their needs, the improvement could be as described below.

when I setup a layer with rule bases symbology like this :

I would expect (in a perfect world..) to view it like that in qwc2 (in fact like in qgis desktop):

So I can :

• easily read the legend
• toggle visibility of each rule of my rule based layer.

I imagine its not a little work, but if done, many users i'm working with would be happy.

Regards

[manisandro]

Hi, I guess [1] should mostly cover this?

[1] https://qwc-services.github.io/master/configuration/ThemesConfiguration/#split-categorized-layers

[patricev]

@manisandro

Great, thank you for your answer, we'll test it as soon as we can. Do you have somme screenshots to see what it will look like ?

[manisandro]

The categories will just appear as regular sublayers in the layertree.

[patricev]

Ok, then the remaining part of the ticket is : is it planed to show the legend within the layer plugin as a clearly lisible icon (at least for layer with unique style / non ruled based) and not as an image with hover (that contains multiple times the layer name ) ?

actual

wish

Thx

[manisandro]

You can control this by specifying extraLegendParameters [1] in the theme configuration.

[1] https://qwc-services.github.io/master/configuration/ThemesConfiguration/#manual-theme-configuration

[patricev]

@manisandro Many thx for those tips. Eager to test it.

[patricev]

Hi,

I keep you informed of our progress.

The good part :

• the categorized layer work fine
• we can modifiy the legend, and the experience is better ; )

But :

• the categorized layer doesn't work anymore if they are other "bad layers" in the qgis project. In our case, if there is a WMS layer, or a "bad layer" (eg not available in the db), then the categorized layer doesn't work. It seems that the error is line 38. We have to make a try/catch to keep qwc2 working, but the categorization algorithm still doesn't work if we do that : /

• Also, if we've got a temporal layer , and we want to "categorize" it, then the categorized layers don't heritate of the temporal parameters.

• Finaly, when we categorize the layers, and that we modifiy the getlegendgraphic , we've got a single symbol in the legend like above. Is there a way to "center" it so that it could be feeled more "clean" for the user ?

Many thx

[manisandro]

Regarding the legend, you could use the legend service to provide custom legend images. Or play with the extraLegendParameters in the theme configuration.

Regarding the other points, yes the plugin might need some improvements to cover those cases. PRs welcome!