[Qgis-developer] New processing manage fields algorithm

[Victor Olaya]

That's definitely a nice idea. I guess this was what you started working on
at the Hackfest but i wasn't of much help since i wasn't understanding the
idea completely... :-(

Here are some suggestions:

- There are some algorithms that have a custom UI and that you can take as
example. The vector calculator is probably one of them
- You will need to create a custom UI for the modeler as well, in case you
want to appear with a nicer dialog than the default one. Processing
supports that, but there is no algorithm currently using it. I can take
care of that once you have the basic UI finished
- Sounds like it would be a nice algorithm to have for editing a layer.
That is, to modify it instead of generating a new one. You can do that by
not having a visible output layer in the UI, and just returning the input
layer source path instead as output value.

Let me know if you have questions.

Regards

2014-10-20 16:52 GMT+02:00 Arnaud Morvan <arnaud.morvan at camptocamp.com>:

>
> We want to create a new processing algorithm for manage table fields.
>
> This new algorithm would have :
>     one standard input layer vector parameter
>     one standard output layer vector parameter
>
>     a specific fields mapping parameter composed, in columns
>         source field name (optionnal)
>         destination field name
>         destination type, length, precision
>         expression (default to the source field name)
>     the mapping would be initialized, when possible, with the input layer
> fields.
>
> In the dialog :
>     the first tab would present the normal input/output parameters and a
> button to go to the next tab
>     the supplementary fields tab would contains the fields mapping
>
> The final goal is to supply a user friendly interface to manage table
> fields :
>     rename fields
>     change field types
>     add new fields based on expression
>     change fields order
> and save the result as a new file, temporary file or memory layer
>
> What do you think about this ? Any remarks ?
>
> Arnaud
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