Oh, sorry, I think that's a new thing in 6.3. if f.makeKnobs()
dynamic_cast the Knob to ArrayKnobI and call setValueProvider() on that,
I believe is the actual answer.
On Wed, 2011-06-15 at 17:26 -0700, Nathan Rusch wrote:
> Thanks for the sample code. I think I'm just about there, but I can't seem
> to get the ValueProvider hooked up.
>
> There's no function called "SetValueProvider" that I can find anywhere in
> any of the header files, and attempting to build anyway results in a
> (predictable) "not declared in this scope" error. Is it possible this is one
> that should be exposed but in fact isn't yet? Or is there another way to
> hook the knob up to the provider?
>
> Thanks,
>
> -Nathan
>
> -----Original Message-----
> From: Abigail Brady
> Sent: Tuesday, June 14, 2011 3:13 AM
> To: Nuke plug-in development discussion
> Subject: Re: [Nuke-dev] Using knob as a feedback device
>
> It would look something like (note, I didn't test this):
>
> class Example : public Iop, public ArrayKnobI::ValueProvider
> {
>
> ...
>
> void knobs(Knob_Callbacks f) {
> Float_knob(f, &_a0, "a0");
> Float_knob(f, &_a1, "a1");
>
> Int_knob(f, &_which, "which");
> SetValueProvider(f, this);
> }
>
> bool provideValuesEnabled(const ArrayKnobI*,
> const OutputContext& oc) const
> {
> return true;
> }
>
> std::vector<double> provideValues(const ArrayKnobI*,
> const OutputContext& oc)
> {
> float a0 = knob("a0")->get_value_at_view(oc.frame(), oc.view());
> float a1 = knob("a1")->get_value_at_view(oc.frame(), oc.view());
> std::vector<double> values;
> values.push_back(a1 > a0);
> return values;
> }
> };
>
> On Mon, 2011-06-13 at 10:06 -0700, Nathan Rusch wrote:
> > Good to know for certain on that one.
> >
> > I'm just taking a look at ArrayKnobI.h, and am honestly pretty lost on how
> > to get started with the ValueProvider. Do you have a quick block of sample
> > code that would show me how or where to go about implementing it? I was
> > hoping for something in the NDK examples, but no luck... Sorry, I'm still
> > not on top of all the NDK nooks and crannies.
>
--
Abigail Brady, Senior Architect
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