[QGIS-Developer] Dirtying project within model classes or not

[Nyall Dawson]

On Tue, 4 Nov 2025, 6:45 pm David Koňařík via QGIS-Developer, <
qgis-developer at lists.osgeo.org> wrote:

>
> I don't have an opinion on dirtying (due to lack of experience with it),
> but I do have an opinion on signals and callbacks:
>
> I agree that QGIS sometimes overuses signals, but I think callbacks are
> only a reasonable replacement where there will be exactly one callback,
> and only when that callback isn't stored in an object.
>
> Apart from the code duplication introduced by manually handling lists of
> callback functions (and slowly reimplementing signals ourselves),
> signals, when attached to objects, will automatically respond to the
> destruction of one of the endpoints. This means that properly-connected
> signals will never cause use-after-free issues, and that is reason
> enough to use them, in my opinion.
>

+1. Effectively reimplementing qobject ourselves is not a good idea at all.

Nyall


> David Koňařík
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