[QGIS-Developer] Questions regarding the QgsProcessingAlgorithm class

[Ujaval Gandhi]

Some ideas inline below


[data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=3D]
On Thu, Nov 23, 2023 at 4:33 PM Bo Victor Thomsen via QGIS-Developer
<qgis-developer at lists.osgeo.org [qgis-developer at lists.osgeo.org]> wrote:


> Hi list -
> 
> 
> I apologize for the cross-posting to this mailing list from qgis-user. But I
> hope, that somebody has the answers to the questions... 
> 
> 
> I have a couple of (probably dumb) questions on how to use the
> "QgsProcessingAlgorithm" class.
> 
>  * A have a lot parameter inputs placed in the "advanced" section af the
>    processing input dialog. It's parameters that seldom has to be changed.
>    How do I present the "Avanced" section not unfolded? The default is to
>    unfold this section and thus possibly confuse users by showing a lot of
>    seldom changed parameters.
>    
>    

This behavior seems to be controlled on the user side and is sticky. In my QGIS
install, when I collapse the 'Advanced' section in an algorithm, all subsequent
algorithms have that section collapsed.  There must be a setting that you
can probably toggle via PyQGIS. Maybe someone else here knows.
>  * 
>  * One of my input parameters is a "QgsProcessingParameterString" parameter
>    that will contain a password.
>    Can I obfuscate the parameter input, i.e showing '*******' instead of the
>    password ?
>    
>    

This is generally discouraged in favor of using the Auth manager. Could you
store the password there and retrieve it in your script? 
>  * 
>  * the "QgsProcessingParameterFeatureSource" method creates a drop-down with
>    names of layers in the map and a checkbox with the label "Selected features
>    only". Is it possible to set the checkmark automatically when showing the
>    processing userdialog ? And how ??



I don't think this is possible. As a workaround, if you always want to use
selected features when available, you can use QgsProcessingParameterVectorLayer
input instead, check if there are selected layers when processing it and get
only selected features.
>  * 
>    
> 
> -- 
> Med venlig hilsen / Best regards
> 
> Bo Victor Thomsen
> 
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