[Paraview-developers] information_only property doesn't update, please help

[iusadhfoias sidufasipudf]

Dear Utkarsh,
thank you very much for finally solving my problem. I wish, I could
understand the details of what is happening under the hood, so that I could
modify your example for our needs. But I assume it is asked too much
whether somebody could create a thoroughly commented wiki page from this
example, given that the information_only mechanism seems to be a mystery to
many users.

For example, we'd need the "Calculated Point" to line up below the "Input
Point" with the same styles, not as a different widget group with bold
heading above. Is it necessary to use a <PropertyGroup>, couldn't we just
use the same visual display as for the other <DoubleVectorProperty>?

Finally, what is this line doing, in words? "this->addPropertyLink(edit,
"text2", SIGNAL(textChanged(const QString&)), infoprop, cc);"
It seems like "edit" is the widget displaying the calculated point
coordinates. Is "edit" notifying "infoprop" or vice versa, or what's going
on here?
Unfortunately there is not even the shortest documentation for
pqPropertyWidget::addPropertyLink in the ParaView sources.

Many thanks,
Jussuf

On Mon, May 28, 2018 at 8:58 PM, Utkarsh Ayachit <
utkarsh.ayachit at kitware.com> wrote:

> Jussuf,
>
> Short answer, this is not how information only properties are mean to be
> used. Attached example updates your code to instead use a custom-widget to
> show the value.
>
> Utkarsh
>
> On Tue, Feb 27, 2018 at 12:43 PM iusadhfoias sidufasipudf <
> asduifhssauidf at gmail.com> wrote:
>
> > Hello VTK developers,
> > several questions about the correct usage of information_only properties
> have been asked over the years, but I didn't find a working solution.
>
> > The attached example is a complete, tiny, source plugin ("MyInfoSource")
> for paraview 5.4.1. It generates an empty PolyData output. I am only
> interested in modifying and showing the source's properties.
>
> > MyInfoSource has 3 properties (cf. InfoSource.xml):
> > 1) InputPoint allows to input three coordinates.
> > 2) CalculatedPoint has 'information_only="1"' and will be calculated
> whenever InputPoint is set.
> > 3) ShowCalculatedPoint has 'information_property="CalculatedPoint"' and
> is meant to output that calculated value.
>
> > I am using a modified vtkInfoSource::SetInputPoint, which sets the
> CalculatedPoint coordinates to twice the InputPoint coordinates whenever
> InputPoint changes (cf. vtkInfoSource.cxx).
>
> > I was expecting the "ShowCalculatedPoint" property to update in the
> properties view, whenever I apply changes to InputPoint, but it doesn't
> change. Only when I click "Restore application default setting values" for
> MyInformationSource, then ShowCalculatedPoint shows twice the last value of
> InputPoint.
>
> > Can you reproduce this behaviour?
> > What needs to be changed, so that ShowCalculatedPoint always shows twice
> the InputPoint coordinates after changes are applied?
>
> > Many thanks,
> > Jussuf
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