Drag and drop system with objects replacement

[ChellaP]

I’m working on a drag and drop interaction myself. And struggling. I was looking at your example just now to try to solve it.

I actually made a feature request for a robust drag and drop functionality here:

Robust Drag and Drop functionality

I might mangle the terms, but something like this: A behavior I can attach to a drop zone and a behavior I can attach to drag object(s). A way to specify within the behavior whether the object is accepted or rejected by the drop zone. Does this object match the drop zone criteria. (i.e. only “1 handed weapons” may be dropped in this weapon drop zone, not “2 handed weapons” or “chest armor”) A way to handle kicking out an object that is currently in the drop zone, if the drop zone can on…

It feels like drag and drop would be a good core behavior to have in the engine. I’m doing a fair bit of work to try to create a reusable version of drag and drop, but not succeeding so far, though I think I’m getting close.

The main problem I have is the “kick it out” functionality for when a dragged object replaces another. I’ll post here if I figure it out.