Detecting UIScrollList changes / when kerbals are added to vehicle crew list?

[JonDahm]

I'm trying to detect when kerbals are placed in a vehicle in the editors and the Launch Window (the window that pops up when you click on the Launch Pad or the Runway). I've been wracking my brain for a few days now, and I can't find anything. The UIScrollList that the available crew is kept in doesn't have any hooks for detecting when items are added/removed, and there aren't any other generic hooks available that I can find -- I tried GameEvents.onKerbalStatusChange(), but the kerbals' statuses don't change until you actually launch the vehicle. Does anyone have any insights?

[JonDahm]

Bump! I really need some help here!

[xEvilReeperx]

I'll look into it if I get some time today but it sounds like you're on the right track already if you have a hold of the right UIScrollList(s). Try adding delegates for drag and drop and value changed to it (AddDragDropDelegate, AddValueChangedDelegate, not the Set* ones). If that doesn't work, try adding an input delegate and checking the events yourself.

That's how I'd start. If neither of those work, we'll dig in further

[JonDahm]

Hmmm. I don't remember if I tried the SetXDelegate or AddXDelegate methods. Whichever one I chose didn't do anything. I'll definitely try them again. I'm not actually familiar with how the Input Delegate works, to be honest, but I'll experiment.

[JonDahm]

Alright, AddValueChangedDelegate gives me a hook into when kerbals are added back into the UIScrollList, but not when they're taken out. That's okay for my application, but I thought I'd warn future readers. Unfortunately, I've just discovered that in the Launch Window and the Editor, you can drag and drop kerbals to temporarily swap them or put them into ships. You can also drag them back into the list, but this doesn't trigger the ValueChangedDelegate or any of the other publicly available hooks on the UIScrollList. The InputDelegate hook on the list items themselves will tell you when the user is dragging a kerbal, but the other delegates don't do anything. Damnit. I suppose that's a start, though...