Reading source param as part of ExpireDownStreamObjects()

Grasshopper
,
1

I’m overriding the ExpireDownStreamObjects() function of component. I want it to be DEPENDENT on the input value to the component. So essentially just:
If P = True, then have ExpireDownStreamObjects() behave one way (the default behaviour)
if P=False, then it should behave in a different way

protected override void ExpireDownStreamObjects()
        {
            if (P)
            {
                base.ExpireDownStreamObjects();
                return;
            }
        }

The important part is how to read the value of P. P come from one of the sources to the component. Now if I just read P from the component itself I will get an old value. I want the new value that comes from the source.

So I’m instead reading the source

var sources = Params.Input[1].Sources;

            if (sources?.Count > 0)
            {
                var source = sources[0];
                source.CollectData();

                var volatileData = source.VolatileData;

                if (!volatileData.IsEmpty && volatileData.get_Branch(0)?.Count > 0)
                {
                    var dataItem = volatileData.get_Branch(0)[0];

                    if (GH_Convert.ToBoolean(dataItem, out bool result, GH_Conversion.Both) && result)
                    {
                        base.ExpireDownStreamObjects();
                    }
                }
            }

However, it’s a hit or miss whether the source has been updated.

Is there a way to WAIT for the source param to be done before deciding whether I should expire downstream components or not?

Extra note: I’m trying to remove bug in the gatekeeper by Atte Mainio: Gatekeeper on github

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2

In other words a datadam with a boolean “pass” input. If the boolean if false, the dam will not run.

We just have trouble getting the input of that boolean read within the ExpireDownStreamComponents method.

@DavidRutten this is very much on our wishlist, even in gh1…

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