Drag And Drop Element Of Array Of Clusters

I have a project that includes an array of "tests", each of which is a cluster containing an array of "part numbers", a regular expression matching string and an array of "test tasks" (each of which, is in turn, a cluster of elements).
That is:
Tests (array of):
Cluster:
Part Numbers (array of strings)
Regex (string)
Tasks (array of):
Cluster:
Task type
Base Channel,
Measurement Channel
Other Channels
I'd like to be able to drag and drop to re-order the task array within an individual test. (It's a nice-to-have rather than an urgent request - more for my own learning than anything). For now, I've implemented "Move Up" and "Move Down" buttons.
The examples are fine for a single cluster that includes an array, or for an array of objects. As soon as we have an array of clusters, it's hard to access the individual elements within a specific cluster.
Has anybody successfully implemented drag and drop within such a setup?
Curiously,
Geoff
Geoff Field, BE, CLAD, MIEAust
Professional geek, amateur stage-levelling gauge
Solved!
Go to Solution.

Hello GeoffF,
This is definitely doable, and you can even use the standard start drag and drop methods/events, the tricky part is determining the array elements that are being selected on mouse up/mouse down and handling the swap manually. Luckily, there are a couple decent examples of how to do this out there already, I'd suggest you take a look at this one:
Community Example: Determine Clicked Array Element Index in LabVIEW
https://decibel.ni.com/content/docs/DOC-22434
That should give you the selected array indices, and then all you have to do is switch the elements around around in the drop event. I've attached a very basic demonstrative example that uses that code I just linked (you'll need to download that as well) and the events mentioned to swap two array elements. The attached code is just thrown together, you'll want to design something more robust and scalable for any sort of real use.
Regards,
Tom L.
Attachments:
array drag.vi ‏21 KB

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f
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