[Paraview] How to know that the filter was applied?

[Utkarsh Ayachit]

There's no such thing as "already applied", since even an already
applied filter may be re-executed if a filter downstream makes a
different request. Whenever a filter is executed, however,
`pqPipelineSource::dataUpdated` signal is fired. You can look at the
implementation of this signal to see that it's connected to
`vtkCommand::DataUpdateEvent` event fired by the vtkSMSourceProxy.

Hopefully that helps.

Utkarsh

On Fri, Mar 23, 2018 at 11:38 AM, Artem Bodrin <art.bodrin at gmail.com> wrote:
> Hello, dear community.
>
> Does anyone can help me with this question: I'd like to know, if a filter in a pipeline have already been applied/calculated. Maybe there are some observers exists (e.g. vtkSMPProgressObserver)? Or I have to dig into vtkDemandDrivenPipeline?
>
> The overall task is to modify some GUI elements depending on a pipeline execution state...
>
> Can anyone push me to a right direction please?
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