Python Access Canvas Sliders from Inside Cluster

Replies to This Discussion

Permalink Reply by Mostapha Sadeghipour Roudsari on March 2, 2016 at 7:10am

You can access objects inside a cluster using .Objects. Here is an example:

if type(obj) == gh.Special.GH_Cluster:
       

       clusterDoc = obj.Document("")
       

       for clusterObj in clusterDoc.Objects:
           #try to find sliders and so on

Permalink Reply by Zachary Trattner on March 2, 2016 at 7:36am

Hi Mostapha,

It seems like you misunderstood my question.  What you've provided would be a solution if I needed to manipulate a slider that was inside a cluster (with the python component on the main canvas).

However my problem is the opposite.  I need to access a slider that is on the main canvas (from inside the cluster).

If you download the example file I provided that should clarify the problem.

Permalink Reply by Andrew Heumann on March 5, 2016 at 5:13am

To access the "parent document" from inside a cluster, get the current GH Document's "Owner" property and cast it to GH_Document. Probably a good idea to test for null - if it's the topmost document it won't have a valid owner. Once you've got that though you can replace any references to the current GH document in your script with the owner and everything should behave as expected.

Permalink Reply by Zachary Trattner on March 5, 2016 at 8:10am

Thanks for the response Andrew.  This seems like the right direction but I don't know how to access the "Owner" property.  All I get when I print Grasshopper.Kernel.GH_Document.Owner is this:  <property# Owner on GH_Document>

Maybe you could tell me how to access it or give an example?

Permalink Reply by Stephen Maher on March 5, 2016 at 9:24am

I have a feeling you'll want to use Grasshopper.Kernel.IGH_OwnerDocument, but I'm not near a computer so I can't verify. Try pinging the parent document and, like Andrew said, replace OnPingDocument().Objects with the owner objects.

Permalink Reply by Zachary Trattner on March 7, 2016 at 3:09am

Not sure if it's because this strategy doesn't work or because I'm so new to ghpython, but I still haven't solved this.

Permalink Reply by Mostapha Sadeghipour Roudsari on March 7, 2016 at 2:10pm

Try this line inside the GHPython component in the cluster. docObjects is the list of objects in owner document:

docObjects = ghenv.Component.OnPingDocument().Owner.OwnerDocument().Objects

Permalink Reply by Zachary Trattner on March 7, 2016 at 2:16pm

Nice one, that did it.  Thanks!

Permalink Reply by Stephen Maher on March 8, 2016 at 6:35am

Looks like I'm a day and a buck short; Mostapha beat me to it! Was just about to post the same solution after (finally) getting to look at it in GH. Glad it's working for you.

/SPM

Permalink Reply by Matt Gaydon on June 17, 2016 at 3:00am

How would you test to see if the component is in a cluster, as Andrew commented on above, as it works nicely in a clustered code but not outside a cluster. 

Also any idea how i could translate this code to maybe C# solve this issue here.

http://www.grasshopper3d.com/forum/topics/trampoline-script-counter...

Thanks

Matt

Permalink Reply by Julien DEFFONTAINES on June 25, 2016 at 6:57am

Hi all,

I am kind of a beginner in scripting...

I am trying to update my slider in the canevas with a C# component inside a cluster.

I manage to do it with python following your instructions, however i didn't manage to get it work with the following lines in C# from Guilio's Trampoline component...

GH_Document RecurseUpTillHighestParentIsFound(GH_Document ghDoc)
{
if(ghDoc.Owner != null && ghDoc.Owner.OwnerDocument() != null)
{
return RecurseUpTillHighestParentIsFound(ghDoc.Owner.OwnerDocument());
}
else return ghDoc;
}

I would really appreciate some help :)