Re: [QGIS-Developer] How to set defaults to QgsProcessingParameterMultipleLayers

[C Hamilton via QGIS-Developer]

>
> > Is there a way to automatically populate as default value of selected
> layers in QgsProcessingParameterMultipleLayers with the selected layers or
> selected groups of layers in the "Layer Panel"?  This would be incredibly
> useful.
>
> You'd (unfortunately -- it's not a trivial change) need to do this via
> a custom Processing widget wrapper, so that your parameter gets its
> own widget class where you can implement this logic.


Nyall, Is there an example somewhere on how to do a custom processing
widget wrapper?

Thanks!
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Re: [QGIS-Developer] How to set defaults to QgsProcessingParameterMultipleLayers

[Nyall Dawson via QGIS-Developer]

On Sat, 28 Jan 2023 at 05:35, C Hamilton via QGIS-Developer
 wrote:
>
> I just received a request to update the Density Analysis plugin density hash 
> algorithms so they work with multiple layers and produce one density map 
> based off of multiple input layers. In the algorithm I have replaced 
> QgsProcessingParameterFeatureSource with QgsProcessingParameterMultipleLayers.
>
> Is there a way to automatically populate as default value of selected layers 
> in QgsProcessingParameterMultipleLayers with the selected layers or selected 
> groups of layers in the "Layer Panel"?  This would be incredibly useful.

You'd (unfortunately -- it's not a trivial change) need to do this via
a custom Processing widget wrapper, so that your parameter gets its
own widget class where you can implement this logic.

Nyall


>
> I am doing this as a QgsProcessingAlgorithm. The layerType to  
> QgsProcessingParameterMultipleLayers is QgsProcessing.TypeVectorPoint.
>
> Thanks for your help.
>
> Calvin
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